MedWorm: Nanotechnology

Systematic Electron Crystallographic Studies of Self-Assembled Binary Nanocrystal Superlattices

ACS Nano — Sat, 20 Mar 2010 10:00:54 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

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Enrichment of Armchair Carbon Nanotubes via Density Gradient Ultracentrifugation: Raman Spectroscopy Evidence

ACS Nano — Fri, 19 Mar 2010 19:33:39 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Quantum Confinement, Surface Roughness, and the Conduction Band Structure of Ultrathin Silicon Membranes

ACS Nano — Fri, 19 Mar 2010 19:29:58 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Quantum effect spotted in a visible object

Nanotechweb.org News — Fri, 19 Mar 2010 17:52:47 +0100

An important step towards testing Schrödinger's cat paradox (Source: Nanotechweb.org News)

Organic−Inorganic Composite Nanocoatings with Superhydrophobicity, Good Transparency, and Thermal Stability

ACS Nano — Fri, 19 Mar 2010 16:56:15 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Stimuli-Responsive Liposome Fusion Mediated by Gold Nanoparticles

ACS Nano — Thu, 18 Mar 2010 10:00:26 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

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Structural and Electrochemical Characterization of Pure LiFePO4 and Nanocomposite C-LiFePO4 Cathodes for Lithium Ion Rechargeable Batteries

Research Letters in Nanotechnology — Wed, 17 Mar 2010 17:09:15 +0100

Pure lithium iron phosphate (LiFePO4) and carbon-coated LiFePO4 (C-LiFePO4) cathode materials were synthesized for Li-ion batteries. Structural and electrochemical properties of these materials were compared. X-ray diffraction revealed orthorhombic olivine structure. Micro-Raman scattering analysis indicates amorphous carbon, and TEM micrographs show carbon coating on LiFePO4 particles. Ex situ Raman spectrum of C-LiFePO4 at various stages of charging and discharging showed reversibility upon electrochemical cycling. The cyclic voltammograms of LiFePO4 and C-LiFePO4 showed only a pair of peaks corresponding to the anodic and cathodic reactions. The first discharge capacities were 63, 43, and 13 mAh/g for C/5, C/3, and C/2, respectively for LiFePO4 where as in case of C-LiFePO4 that ...

Hydrogen-sensing mechanism depends on thickness

Nanotechweb.org journal highlights — Wed, 17 Mar 2010 17:09:02 +0100

Argonne team explores crossover behaviour in palladium film design (Source: Nanotechweb.org journal highlights)

Trapped ions go for a quantum walk

Nanotechweb.org News — Wed, 17 Mar 2010 16:58:33 +0100

Longest quantum walk to date could lead to computing applications (Source: Nanotechweb.org News)

Diameter-Engineered SnO2 Nanowires over Contact-Printed Gold Nanodots Using Size-Controlled Carbon Nanopost Array Stamps

ACS Nano — Wed, 17 Mar 2010 16:43:17 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Dye-Sensitized Photovoltaic Wires Using Highly Ordered TiO2 Nanotube Arrays

ACS Nano — Wed, 17 Mar 2010 13:05:42 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

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Selective Decoration of Metal Nanoparticles inside or outside of Organic Microstructures via Self-Assembly of Resorcinarene

ACS Nano — Wed, 17 Mar 2010 12:53:09 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Current Imaging and Electromigration-Induced Splitting of GaN Nanowires As Revealed by Conductive Atomic Force Microscopy

ACS Nano — Wed, 17 Mar 2010 12:37:46 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Tuning the Magneto-Transport Properties of Nickel−Cyclopentadienyl Multidecker Clusters by Molecule−Electrode Coupling Manipulation

ACS Nano — Wed, 17 Mar 2010 10:00:27 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Excluded Volume Effects on Semiflexible Ring Polymers.

Nano Letters — Wed, 17 Mar 2010 00:00:00 +0100

Authors: Drube F, Alim K, Witz G, Dietler G, Frey E Two-dimensional semiflexible polymer rings are studied both by imaging circular DNA adsorbed on a mica surface and by Monte Carlo simulations of phantom polymers as well as of polymers with finite thickness. Comparison of size and shape of the different models over the full range of flexibilities shows that excluded volume caused by finite thickness induces an anisotropic increase of the main axes of the conformations, a change of shape, accomplished by an enhanced correlation along the contour. PMID: 20235507 [PubMed - as supplied by publisher] (Source: Nano Letters)

Unraveling Single-Stranded DNA in a Solid-State Nanopore.

Nano Letters — Wed, 17 Mar 2010 00:00:00 +0100

We report translocations of ssDNA but also of ssDNA-dsDNA constructs where we compare the conductance-blockade levels for ssDNA versus dsDNA as a function of voltage. PMID: 20235508 [PubMed - as supplied by publisher] (Source: Nano Letters)

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Three-Dimensional Plasmonic Nanofocusing.

Nano Letters — Wed, 17 Mar 2010 00:00:00 +0100

Authors: Lindquist NC, Nagpal P, Lesuffleur A, Norris DJ, Oh SH We demonstrate three-dimensional plasmonic nanofocusing of light with patterned metallic pyramids obtained via template stripping. Gratings on the faces of these pyramids convert linearly polarized light into plasmons that propagate toward and converge at a approximately 10 nm apex. Experiments and computer simulations confirm that optical energy is focused into a nanoscale volume (5 x 10(-5) wavelength(3)). Because these structures are easily and reproducibly fabricated, our results could benefit many applications, including imaging, sensing, lithography, and nonlinear spectroscopy. PMID: 20235511 [PubMed - as supplied by publisher] (Source: Nano Letters)

Mapping of Local Conductivity Variations on Fragile Nanopillar Arrays by Scanning Conductive Torsion Mode Microscopy.

Nano Letters — Wed, 17 Mar 2010 00:00:00 +0100

Authors: Weber SA, Haberkorn N, Theato P, Berger R A gentle method that combines torsion mode topography imaging with conductive scanning force microscopy is presented. By applying an electrical bias voltage between tip and sample surface, changes in the local sample conductivity can be mapped. The topography and local conductivity variations on fragile free-standing nanopillar arrays were investigated. These samples were fabricated by an anodized aluminum oxide template process using a thermally cross-linked triphenylamine-derivate semicondcutor. The nanoscale characterization method is shown to be nondestructive. Individual nanopillars were clearly resolved in topography and current images that were recorded simultaneously. Local current-voltage characteristics suggest a space-charge...

Plasmon-Enhanced Charge Carrier Generation in Organic Photovoltaic Films Using Silver Nanoprisms.

Nano Letters — Wed, 17 Mar 2010 00:00:00 +0100

Authors: Kulkarni AP, Noone KM, Munechika K, Guyer SR, Ginger DS We use photoinduced absorption spectroscopy to measure long-lived photogenerated charge carriers in optically thin donor/acceptor conjugated polymer blend films near plasmon-resonant silver nanoprisms. We measure up to 3 times more charge generation, as judged by the magnitude of the polaron absorption signal, in 35 nm thin blend films of poly(3-hexylthiophene)/phenyl-C(61)-butyric acid methyl ester on top of films of silver nanoprisms ( approximately 40-100 nm edge length). We find that the polaron yields increase linearly with the total sample extinction. These excitation enhancements could in principle be used to increase photocurrents in thin organic solar cells. PMID: 20235514 [PubMed - as supplied by publisher] ...

Covalently Linked DNA Nanotubes.

Nano Letters — Wed, 17 Mar 2010 00:00:00 +0100

Authors: Wilner OI, Henning A, Shlyahovsky B, Willner I The present study introduces an approach to prepare covalently linked DNA nanotubes. A circular DNA that includes at its opposite poles thiol and amine functionalities acts as the building block for the construction of the DNA nanotubes. The circular DNA is cross-linked with a bis-amide-modified nucleic acid to yield DNA nanowires, and these are subsequently cross-linked by a bis-thiolated nucleic acid to yield the DNA nanotubes. Alternatively, a circular DNA that includes four amine functionalities on its poles is cross-linked in one-step by the bis-thiolated nucleic acid to yield the nanotubes. The resulting nanostructures are stable and nonseparable upon heating. PMID: 20235526 [PubMed - as supplied by publisher] (Source: N...

Oxford Nanotechnology Summer School 2010 Oxford University, UK

Nanotechweb.org Events — Tue, 16 Mar 2010 18:23:27 +0100

Course: 5 Jul 2010 - 9 Jul 2010, Oxford University Begbroke Science Park, United Kingdom. Organized by University of Oxford, CPD Centre. (Source: Nanotechweb.org Events)

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Quantum dots highlight tumour heterogeneity

Nanotechweb.org journal highlights — Tue, 16 Mar 2010 18:20:06 +0100

Sensitive and specific test reveals differences among individual breast-cancer cells (Source: Nanotechweb.org journal highlights)

Electrical signals transmitted via spin waves

Nanotechweb.org News — Tue, 16 Mar 2010 18:14:12 +0100

Insulator-based "spin wiring" could boost spintronics (Source: Nanotechweb.org News)

Tuning Magnetism in Zigzag ZnO Nanoribbons by Transverse Electric Fields

ACS Nano — Tue, 16 Mar 2010 14:40:21 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

PEG-Mediated Synthesis of Highly Dispersive Multifunctional Superparamagnetic Nanoparticles: Their Physicochemical Properties and Function In Vivo

ACS Nano — Tue, 16 Mar 2010 13:21:18 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Swelling-Induced Folding in Confined Nanoscale Responsive Polymer Gels

ACS Nano — Tue, 16 Mar 2010 12:58:23 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

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Two-Terminal Molecular Memories from Solution-Deposited C60 Films in Vertical Silicon Nanogaps

ACS Nano — Tue, 16 Mar 2010 10:00:30 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

SERS aggregates patterned by laser trapping

Nanotechweb.org journal highlights — Tue, 16 Mar 2010 08:44:17 +0100

Optical trapping of plasmonic nanoparticles and bubble formation in aqueous suspension (Source: Nanotechweb.org journal highlights)

Enter the 'thermopower wave'

Nanotechweb.org News — Tue, 16 Mar 2010 08:00:42 +0100

New way of generating electricity may enable micro power sources for nano devices (Source: Nanotechweb.org News)

Confinement-Induced One-Dimensional Ferroelectric Polymer Arrays.

Nano Letters — Tue, 16 Mar 2010 00:00:00 +0100

Authors: García-Gutiérrez MC, Linares A, Hernández JJ, Rueda DR, Ezquerra TA, Poza P, Davies RJ This work demonstrates the use of wetting nanoporous alumina template with polymer solution to produce arrays of isolated poly(vinylidene fluoride) (PVDF) ferroelectric gamma-type nanorods supported within a nonpolar alpha-structure film. The method is based upon a crystal phase transition which occurs due to PVDF confinement within alumina nanoporous. The system was studied using scanning X-ray microdiffraction (mu-XRD) that allows the solid-solid phase transition from the alpha-nonpolar crystal form (bulk) to the gamma polar ferroelectric form (nanorod array) to be spatially resolved, as well as providing crystallinity and orientation information. The results reveal th...

Electrochemically Gated Oligopeptide Nanowires Bridging Gold Electrodes: Novel Bio-Nanoelectronic Switches Operating in Aqueous Electrolytic Environments.

Nano Letters — Tue, 16 Mar 2010 00:00:00 +0100

We present electronic structure and transport calculations that reveal that oligopeptide based molecular nanowires support unoccupied extended electronic states that span the length of the nanowire and are resistant to disorder. Electrochemical gating in aqueous electrolytes is shown to bring these extended states into resonance with the Fermi level of gold electrodes, transforming these nanowires from insulators into conductors. Thus oligopeptide nanowires are promising candidates for bionanoelectronic switches operating in the aqueous electrolytic environments native to biological systems. PMID: 20232837 [PubMed - as supplied by publisher] (Source: Nano Letters)

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Synthesis of Platinum Cubes, Polypods, Cuboctahedrons, and Raspberries Assisted by Cobalt Nanocrystals.

Nano Letters — Tue, 16 Mar 2010 00:00:00 +0100

Authors: Lim SI, Ojea-Jiménez I, Varon M, Casals E, Arbiol J, Puntes V PMID: 20232856 [PubMed - as supplied by publisher] (Source: Nano Letters)

Filtering of Elastic Waves by Opal-Based Hypersonic Crystal.

Nano Letters — Tue, 16 Mar 2010 00:00:00 +0100

We report experiments in which high quality silica opal films are used as three-dimensional hypersonic crystals in the 10 GHz range. Controlled sintering of these structures leads to well-defined elastic bonding between the submicrometer-sized silica spheres, due to which a band structure for elastic waves is formed. The sonic crystal properties are studied by injection of a broadband elastic wave packet with a femtosecond laser. Depending on the elastic bonding strength, the band structure separates long-living surface acoustic waves with frequencies in the complete band gap from bulk waves with band frequencies that propagate into the crystal leading to a fast decay. PMID: 20232893 [PubMed - as supplied by publisher] (Source: Nano Letters)

Long-Range Energy Propagation in Nanometer Arrays of Light Harvesting Antenna Complexes.

Nano Letters — Tue, 16 Mar 2010 00:00:00 +0100

Authors: Escalante M, Lenferink A, Zhao Y, Tas N, Huskens J, Hunter CN, Subramaniam V, Otto C Here we report the first observation of long-range transport of excitation energy within a biomimetic molecular nanoarray constructed from LH2 antenna complexes from Rhodobacter sphaeroides. Fluorescence microscopy of the emission of light after local excitation with a diffraction-limited light beam reveals long-range transport of excitation energy over micrometer distances, which is much larger than required in the parent bacterial system. The transport was established from the influence of active energy-guiding layers on the observed fluorescence emission. We speculate that such an extent of energy migration occurs as a result of efficient coupling between many hundreds of LH2 molecules. The...

Template-Assisted Fabrication of Salt-Independent Catalytic Tubular Microengines

ACS Nano — Mon, 15 Mar 2010 17:08:51 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Design and Fabrication of 1 × 2 Nanophotonic Switch

Research Letters in Nanotechnology — Mon, 15 Mar 2010 17:08:50 +0100

We present the design and the fabrication of a novel 1×2 nanophotonic switch. The switch is a photonic T-junction in which a gold nano particle is being positioned in the junction using the tip of an atomic force microscope (AFM). The novelty of this 1×2 switch is related to its ability to control the direction of wave that propagates along a photonic structure. The selectivity of the direction is determined by a gold nanoparticle having dimension of a few tens of nanometer. This particle can be shifted. The shift of the gold nano particle can be achieved by applying voltage or by illuminating it with a light source. The shifts of the particle, inside the air gap, direct the input beam ones to the left output of the junction and once to its right output. Three types of simula...

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Emerging Photoluminescence in Monolayer MoS(2).

Nano Letters — Mon, 15 Mar 2010 00:00:00 +0100

Authors: Splendiani A, Sun L, Zhang Y, Li T, Kim J, Chim CY, Galli G, Wang F Novel physical phenomena can emerge in low-dimensional nanomaterials. Bulk MoS(2), a prototypical metal dichalcogenide, is an indirect bandgap semiconductor with negligible photoluminescence. When the MoS(2) crystal is thinned to monolayer, however, a strong photoluminescence emerges, indicating an indirect to direct bandgap transition in this d-electron system. This observation shows that quantum confinement in layered d-electron materials like MoS(2) provides new opportunities for engineering the electronic structure of matter at the nanoscale. PMID: 20229981 [PubMed - as supplied by publisher] (Source: Nano Letters)

Low-Symmetry Phases in Ferroelectric Nanowires.

Nano Letters — Mon, 15 Mar 2010 00:00:00 +0100

Authors: Louis L, Gemeiner P, Ponomareva I, Bellaiche L, Geneste G, Ma W, Setter N, Dkhil B Ferroelectric nanostructures have recently attracted much attention due to the quest of miniaturizing devices and discovering novel phenomena. In particular, studies conducted on two-dimensional and zero-dimensional ferroelectrics have revealed original properties and their dependences on mechanical and electrical boundary conditions. Meanwhile, researches aimed at discovering and understanding properties of one-dimensional ferroelectric nanostructures are scarce. The determination of the structural phase and of the direction of the polarization in one-dimensional ferroelectrics is of technological importance, since, e.g., a low-symmetry phase in which the polarization lies away from a highly sy...

Resonant Germanium Nanoantenna Photodetectors.

Nano Letters — Mon, 15 Mar 2010 00:00:00 +0100

Authors: Cao L, Park JS, Fan P, Clemens B, Brongersma ML On-chip optical interconnection is considered as a substitute for conventional electrical interconnects as microelectronic circuitry continues to shrink in size. Central to this effort is the development of ultracompact, silicon-compatible, and functional optoelectronic devices. Photodetectors play a key role as interfaces between photonics and electronics but are plagued by a fundamental efficiency-speed trade-off. Moreover, engineering of desired wavelength and polarization sensitivities typically requires construction of space-consuming components. Here, we demonstrate how to overcome these limitations in a nanoscale metal-semiconductor-metal germanium photodetector for the optical communications band. The detector capitalizes...

Nanotubes transport therapeutic boron to cancer cells

Nanotechweb.org journal highlights — Sat, 13 Mar 2010 16:40:23 +0100

Functionalized single-walled carbon nanotubes evaluated as potential carrier vehicles for BNCT (Source: Nanotechweb.org journal highlights)

Plasmonic nanostructures enhance light fields

Nanotechweb.org News — Sat, 13 Mar 2010 16:39:57 +0100

New composite structures are promising for optics and sensing applications (Source: Nanotechweb.org News)

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Catalyst pre-treatment produces isolated CNT bundles

Nanotechweb.org journal highlights — Fri, 12 Mar 2010 16:52:02 +0100

French team studies effect of hydrogen plasma on iron layer to enhance functionalization prospects (Source: Nanotechweb.org journal highlights)

Graphene makes ultrafast laser

Nanotechweb.org News — Fri, 12 Mar 2010 16:48:51 +0100

Cambridge University team's result paves the way to graphene-based photonics (Source: Nanotechweb.org News)

ONLINE WEBINAR - 21 CFR Part 11: Auditing for Part 11 Compliance by Jasmin NUHIC

Nanotechweb.org Events — Fri, 12 Mar 2010 16:48:42 +0100

Conference: 18 Mar 2010, ONLINE WEBINAR, United States. Organized by Global Compliance Panel. (Source: Nanotechweb.org Events)

Polymer Nanowire/Fullerene Bulk Heterojunction Solar Cells: How Nanostructure Determines Photovoltaic Properties

ACS Nano — Fri, 12 Mar 2010 11:00:30 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Resistive Switching Multistate Nonvolatile Memory Effects in a Single Cobalt Oxide Nanowire.

Nano Letters — Fri, 12 Mar 2010 00:00:00 +0100

Authors: Nagashima K, Yanagida T, Oka K, Taniguchi M, Kawai T, Kim JS, Park BH A multistate nonvolatile memory operated at sublithographic scale has been strongly desired since other nonvolatile memories have confronted the fundamental size limits owing to their working principles. Resistive switching (RS) in metal-oxide-metal junctions, so-called ReRAM, is promising for next generation high-density nonvolatile memory. Self-assembled oxide nanowire-based RS offers an attractive solution not only to reduce the device size beyond the limitation of current lithographic length scales but also to extract the underlying nanoscale RS mechanisms. Here we demonstrate the multistate bipolar RS of a single Co(3)O(4) nanowire (10 nm scale) with the endurance up to 10(8). In addition, we succeeded ...

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Nanostructured Hybrid Polymer-Inorganic Solar Cell Active Layers Formed by Controllable in Situ Growth of Semiconducting Sulfide Networks.

Nano Letters — Fri, 12 Mar 2010 00:00:00 +0100

Authors: Leventis HC, King SP, Sudlow A, Hill MS, Molloy KC, Haque SA Nanostructured composites of inorganic and organic materials are attracting extensive interest for electronic and optoelectronic device applications. In this paper, we introduce a general method for the fabrication of metal sulfide nanoparticle/polymer films employing a low-cost and low temperature route compatible with large-scale device manufacturing. Our approach is based upon the controlled in situ thermal decomposition of a solution processable metal xanthate precursor complex in a semiconducting polymer film. To demonstrate the versatility of our method, we fabricate a CdS/P3HT nanocomposite film and show that the metal sulfide network inside the polymer film assists in the absorption of visible light and enabl...

Nanodevices in diagnostics

Wiley Interdisciplinary Reviews: Nanomedicine and Nanobiotechnology — Fri, 12 Mar 2010 00:00:00 +0100

This article gives an overview of several of the most promising nanodevices and nanomaterials along with their applications in clinical practice. Significant work to adapt nanoscale materials and devices to clinical applications involving large interdisciplinary collaborations is already underway with the potential for nanotechnology to become an important enabling diagnostic technology. Copyright © 2010 John Wiley & Sons, Inc.For further resources related to this article, please visit the . (Source: Wiley Interdisciplinary Reviews: Nanomedicine and Nanobiotechnology)

Are DC mobility extractions for nanostructures trustworthy?

Nanotechweb.org News — Thu, 11 Mar 2010 18:15:00 +0100

Pulsed characterization pinpoints problems in direct-current measurement of CNT devices (Source: Nanotechweb.org News)

Probing the Cooperative Nature of the Conductive Components in Polystyrene/Poly(3,4-ethylenedioxythiophene):Poly(styrene sulfonate)−Single-Walled Carbon Nanotube Composites

ACS Nano — Thu, 11 Mar 2010 16:14:34 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Solar Cells and Light Sensors Based on Nanoparticle-Grafted Carbon Nanotube Films

ACS Nano — Thu, 11 Mar 2010 16:13:45 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

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Multicompartment Micelle Morphology Evolution in Degradable Miktoarm Star Terpolymers

ACS Nano — Thu, 11 Mar 2010 11:00:31 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Reduced Thermal Conductivity in Nanoengineered Rough Ge and GaAs Nanowires.

Nano Letters — Thu, 11 Mar 2010 00:00:00 +0100

Authors: Martin PN, Aksamija Z, Pop E, Ravaioli U We model and compare the thermal conductivity of rough semiconductor nanowires (NWs) of Si, Ge, and GaAs for thermoelectric devices. On the basis of full phonon dispersion relations, the effect of NW surface roughness on thermal conductivity is derived from perturbation theory and appears as an efficient way to scatter phonons in Si, Ge, and GaAs NWs with diameter D < 200 nm. For small diameters and large root-mean-square roughness Delta, thermal conductivity is limited by surface asperities and varies quadratically as (D/Delta)(2). At room temperature, our model previously agreed with experimental observations of thermal conductivity down to 2 W m(-1) K(-1) in rough 56 nm Si NWs with Delta = 3 nm. In comparison to Si, we predict her...

Patterned Multiplex Pathogen DNA Detection by Au Particle-on-Wire SERS Sensor.

Nano Letters — Thu, 11 Mar 2010 00:00:00 +0100

Authors: Kang T, Yoo SM, Yoon I, Lee SY, Kim B A Au particle-on-wire system that can be used as a specific, sensitive, and multiplex DNA sensor is developed. A pattern formed by multiple Au nanowire sensors provides positional address and identification for each sensor. By using this system, multiplex sensing of target DNAs was possible in a quantitative manner with a detection limit of 10 pM. Target DNAs from reference bacteria and clinical isolates were successfully identified by this sensor system, enabling diagnostics for infectious diseases. PMID: 20222740 [PubMed - as supplied by publisher] (Source: Nano Letters)

Doped Graphene as Tunable Electron-Phonon Coupling Material.

Nano Letters — Thu, 11 Mar 2010 00:00:00 +0100

We present a new way to tune the electron-phonon coupling (EPC) in graphene by changing the deformation potential with electron/hole doping. We show the EPC for highest optical branch at the high symmetry point K acquires a strong dependency on the doping level due to electron-electron correlation not accounted in mean-field approaches. Such a dependency influences the dispersion (with respect to the laser energy) of the Raman D and 2D lines and the splitting of the 2D peak in multilayer graphene. Finally this doping dependence opens the possibility to construct tunable electronic devices through external control of the EPC. PMID: 20222744 [PubMed - as supplied by publisher] (Source: Nano Letters)

Impurities possess nanopatterning powers

Nanotechweb.org journal highlights — Wed, 10 Mar 2010 18:26:32 +0100

New ion-beam erosion experiments solve silicon patterning puzzle (Source: Nanotechweb.org journal highlights)

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TR-mode AFM shares STM success

Nanotechweb.org News — Wed, 10 Mar 2010 18:16:54 +0100

Torsion resonance (TR) feedback isolates performance-enhancing tip-sample interaction (Source: Nanotechweb.org News)

Yale University selects Vistec EBPG5000plus Electron-Beam Lithography System

Nanotechweb.org Your News — Wed, 10 Mar 2010 18:16:11 +0100

(Source: Nanotechweb.org Your News)

High-Performance Biosensing Using Arrays of Plasmonic Nanotubes

ACS Nano — Wed, 10 Mar 2010 16:06:17 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Low-Temperature Growth of Silicon Nanotubes and Nanowires on Amorphous Substrates

ACS Nano — Wed, 10 Mar 2010 16:06:16 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Preparation and Characterization of Conductive and Photoluminescent DNA-Templated Polyindole Nanowires

ACS Nano — Wed, 10 Mar 2010 16:06:12 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

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Inhibition of Proliferation and Differentiation of Mesenchymal Stem Cells by Carboxylated Carbon Nanotubes

ACS Nano — Wed, 10 Mar 2010 16:06:11 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Thermal Conductivity of Graphene in Corbino Membrane Geometry

ACS Nano — Wed, 10 Mar 2010 16:06:05 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Structural-Mechanical Characterization of Nanoparticle Exosomes in Human Saliva, Using Correlative AFM, FESEM, and Force Spectroscopy

ACS Nano — Wed, 10 Mar 2010 16:05:48 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

A Noise-Assisted Reprogrammable Nanomechanical Logic Gate.

Nano Letters — Wed, 10 Mar 2010 00:00:00 +0100

We present a nanomechanical device, operating as a reprogrammable logic gate, and performing fundamental logic functions such as AND/OR and NAND/NOR. The logic function can be programmed (e.g., from AND to OR) dynamically, by adjusting the resonator's operating parameters. The device can access one of two stable steady states, according to a specific logic function; this operation is mediated by the noise floor which can be directly adjusted, or dynamically "tuned" via an adjustment of the underlying nonlinearity of the resonator, i.e., it is not necessary to have direct control over the noise floor. The demonstration of this reprogrammable nanomechanical logic gate affords a path to the practical realization of a new generation of mechanical computers. PMID: 20218630 [PubMed - as supp...

Graphene on a Hydrophobic Substrate: Doping Reduction and Hysteresis Suppression under Ambient Conditions.

Nano Letters — Wed, 10 Mar 2010 00:00:00 +0100

Authors: Lafkioti M, Krauss B, Lohmann T, Zschieschang U, Klauk H, Klitzing KV, Smet JH The intrinsic doping level of graphene prepared by mechanical exfoliation and standard lithography procedures on thermally oxidized silicon varies significantly and seems to depend strongly on processing details and the substrate morphology. Moreover, transport properties of such graphene devices suffer from hysteretic behavior under ambient conditions. The hysteresis presumably originates from dipolar adsorbates on the substrate or graphene surface. Here, we demonstrate that it is possible to reliably obtain low intrinsic doping levels and to strongly suppress hysteretic behavior even in ambient air by depositing graphene on top of a thin, hydrophobic self-assembled layer of hexamethyldisilazane (H...

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Large-Area, Lightweight and Thick Biomimetic Composites with Superior Material Properties via Fast, Economic, and Green Pathways.

Nano Letters — Wed, 10 Mar 2010 00:00:00 +0100

Authors: Walther A, Bjurhager I, Malho JM, Pere J, Ruokolainen J, Berglund LA, Ikkala O Although remarkable success has been achieved to mimic the mechanically excellent structure of nacre in laboratory-scale models, it remains difficult to foresee mainstream applications due to time-consuming sequential depositions or energy-intensive processes. Here, we introduce a surprisingly simple and rapid methodology for large-area, lightweight, and thick nacre-mimetic films and laminates with superior material properties. Nanoclay sheets with soft polymer coatings are used as ideal building blocks with intrinsic hard/soft character. They are forced to rapidly self-assemble into aligned nacre-mimetic films via paper-making, doctor-blading or simple painting, giving rise to strong and thick film...

Uptake and Distribution of Ultrasmall Anatase TiO(2) Alizarin Red S Nanoconjugates in Arabidopsis thaliana.

Nano Letters — Wed, 10 Mar 2010 00:00:00 +0100

Authors: Kurepa J, Paunesku T, Vogt S, Arora H, Rabatic BM, Lu J, Wanzer MB, Woloschak GE, Smalle JA While few publications have documented the uptake of nanoparticles in plants, this is the first study describing uptake and distribution of the ultrasmall anatase TiO(2) in the plant model system Arabidopsis. We modified the nanoparticle surface with Alizarin red S and sucrose and demonstrated that nanoconjugates traversed cell walls, entered into plant cells, and accumulated in specific subcellular locations. Optical and X-ray fluorescence microscopy coregistered the nanoconjugates in cell vacuoles and nuclei. PMID: 20218662 [PubMed - as supplied by publisher] (Source: Nano Letters)

An Electrochemically Actuated Reversible DNA Switch.

Nano Letters — Wed, 10 Mar 2010 00:00:00 +0100

Authors: Yang Y, Liu G, Liu H, Li D, Fan C, Liu D In this Letter, we have realized the electrical actuation of a DNA molecular device in a rapid and reliable manner with a microfabricated chip. The three-electrode chip containing Ir, IrO(2), and Ag electrodes deposited in designed shapes and positions on the SiO(2) surface was made by photolithography and magnetron reaction sputter deposition technology. In this design, the negative feedback property enabled the system to rapidly change and maintain the solution pH at arbitrary value by water electrolysis. As a proof-of-concept, we can drive a DNA switch based on the opening and close of an i-motif structure by switching the potential between the working and reference electrodes between -304 and -149 mV. We have demonstrated that DNA c...

Axial Nanometer Distances Measured by Fluorescence Lifetime Imaging Microscopy.

Nano Letters — Wed, 10 Mar 2010 00:00:00 +0100

We present a novel fluorescence lifetime imaging microscopy technique to measure absolute positions of fluorescent molecules within 100 nm above a metalized surface based on distance-dependent fluorescence lifetime modulations. We apply this technique to fluorescently labeled microtubules as optical probes with various unlabeled proteins attached. By measuring the fluorescence lifetimes, we obtain the position of the microtubules and therefore determine the geometrical size of the attached proteins with nanometer precision. PMID: 20218702 [PubMed - as supplied by publisher] (Source: Nano Letters)

Russian scientists demonstrate precision modification of nanotopography of polymer surface with ultraviolet radiation

Nanotechweb.org Your News — Tue, 09 Mar 2010 17:29:16 +0100

(Source: Nanotechweb.org Your News)

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Online Webinar : Excel Spreadsheet Validation To Eliminate 483s by David Nettleton

Nanotechweb.org Events — Tue, 09 Mar 2010 17:27:20 +0100

Conference: 10 Mar 2010, ONLINE WEBINAR, United States. Organized by Global Compliance Panel. (Source: Nanotechweb.org Events)

16th Biodetection Technologies

Nanotechweb.org Events — Tue, 09 Mar 2010 00:00:00 +0100

Conference/exhibition: 17 Jun 2010 - 18 Jun 2010, Arlington, VA, United States. (Source: Nanotechweb.org Events)

3rd Sample Prep

Nanotechweb.org Events — Tue, 09 Mar 2010 00:00:00 +0100

Conference/exhibition: 6 May 2010 - 7 May 2010, Baltimore, MD, United States. Organized by Knowledge Foundation. (Source: Nanotechweb.org Events)

Large-Scale Synthesis and Phase Transformation of CuSe, CuInSe2, and CuInSe2/CuInS2 Core/Shell Nanowire Bundles

ACS Nano — Mon, 08 Mar 2010 19:09:43 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Multifunctional Hydrophobin: Toward Functional Coatings for Drug Nanoparticles

ACS Nano — Mon, 08 Mar 2010 14:46:35 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

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Oxford Nanotechnology Summer School

Nanotechweb.org Events — Mon, 08 Mar 2010 00:00:00 +0100

School: 5 Jul 2010 - 9 Jul 2010, Oxford, United Kingdom. Organized by Oxford University Continuing Professional Development Centre. (Source: Nanotechweb.org Events)

Online Webinar - Internal 21CFR Part 11 Compliance Auditing of Computer Systems by Richard Poser

Nanotechweb.org Events — Mon, 08 Mar 2010 00:00:00 +0100

Conference: 16 Mar 2010, ONLINE WEBINAR, United States. Organized by www.GlobalCompliancePanel.com. (Source: Nanotechweb.org Events)

FDA GMP inspections - preparation and conduct are the keys to success by Peter Calcott

Nanotechweb.org Events — Mon, 08 Mar 2010 00:00:00 +0100

Conference: 31 Mar 2010, ONLINE WEBINAR, United States. Organized by Global COmpliance Panel. (Source: Nanotechweb.org Events)

ONLINE WEBINAR - Leadership in Manufacturing Contamination Control by Teri C. Soli

Nanotechweb.org Events — Mon, 08 Mar 2010 00:00:00 +0100

Conference: 31 Mar 2010, ONLINE WEBINAR, United States. Organized by Global COmpliance Panel. (Source: Nanotechweb.org Events)

Online Webinar - Update on Unique Device Identifier for Device Manufacturers by David R. Dills

Nanotechweb.org Events — Mon, 08 Mar 2010 00:00:00 +0100

Conference: 17 Mar 2010, ONLINE WEBINAR, United States. Organized by GlobalCompliancePanel. (Source: Nanotechweb.org Events)

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ONLINE WEBINAR - Application Controls throughout the Life Cycle of Application Systems by Bernice Russell Bond

Nanotechweb.org Events — Mon, 08 Mar 2010 00:00:00 +0100

Conference/exhibition: 16 Mar 2010, ONLINE WEBINAR, United States. Organized by Global Compliance Panel. (Source: Nanotechweb.org Events)

Online Webinar - Process Validation for Drugs and Biologics by James Harris

Nanotechweb.org Events — Mon, 08 Mar 2010 00:00:00 +0100

Conference: 17 Mar 2010, ONLINE WEBINAR, United States. Organized by Global Compliance Panel. (Source: Nanotechweb.org Events)

Online Webinar PCI Data Breaches: What happened? What may have prevented it? What if it happens to you? by Denise Mainquist

Nanotechweb.org Events — Mon, 08 Mar 2010 00:00:00 +0100

Conference/exhibition: 17 Mar 2010, ONLINE WEBINAR, United States. Organized by Global Compliance Panel. (Source: Nanotechweb.org Events)

ONLINE WEBINAR Applying Lean IT Principles to your IT department to identify opportunities to reduce waste and increase efficiency by Bernice Russell Bond

Nanotechweb.org Events — Mon, 08 Mar 2010 00:00:00 +0100

Conference/exhibition: 30 Mar 2010, ONLINE WEBINAR, United States. Organized by Global Compliance Panel. (Source: Nanotechweb.org Events)

ONLINE WEBINAR - Risk-Based Validation of cGMP Systems by Richard Poser

Nanotechweb.org Events — Mon, 08 Mar 2010 00:00:00 +0100

Conference: 30 Mar 2010, ONLINE WEBINAR, United States. Organized by Global Compliance Panel. (Source: Nanotechweb.org Events)

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ONLINE WEBINAR - Understanding Attribute Acceptance Sampling including Z1.4 and c=0 Plans by Dan OLeary

Nanotechweb.org Events — Mon, 08 Mar 2010 00:00:00 +0100

Conference: 25 Mar 2010, ONLINE WEBINAR, United States. Organized by Global Compliance Panel. (Source: Nanotechweb.org Events)

ONLINE WEBINAR - ISO 13485: 2003 - A Straightforward Interpretation with Recommendations for Easy Implementation by Jeff Kasoff

Nanotechweb.org Events — Mon, 08 Mar 2010 00:00:00 +0100

Conference: 25 Mar 2010, ONLINE WEBINAR, United States. Organized by Global Compliance Panel. (Source: Nanotechweb.org Events)

ONLINE WEBINAR - The FDA Electronic Submission Gateway (ESG) by Albert Cefalo

Nanotechweb.org Events — Mon, 08 Mar 2010 00:00:00 +0100

Conference: 25 Mar 2010, ONLINE WEBINAR, United States. Organized by Global Compliance Panel. (Source: Nanotechweb.org Events)

ONLINE WEBINAR - 21 CFR Part 11 - Compliance for Electronic Records and Signatures by David Nettleton

Nanotechweb.org Events — Mon, 08 Mar 2010 00:00:00 +0100

Conference: 24 Mar 2010, ONLINE WEBINAR, United States. Organized by Global Compliance Panel. (Source: Nanotechweb.org Events)

ONLINE WEBINAR- Risk Management in IEC 60601-1 Third Edition by Edwin L Bills

Nanotechweb.org Events — Mon, 08 Mar 2010 00:00:00 +0100

Conference: 23 Mar 2010, ONLINE WEBINAR, United States. Organized by Global COmpliance Panel. (Source: Nanotechweb.org Events)

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ONLINE WEBINAR - Specification Development by Melinda Allen

Nanotechweb.org Events — Mon, 08 Mar 2010 00:00:00 +0100

Conference: 23 Mar 2010, ONLINE WEBINAR, United States. Organized by Global Compliance Panel. (Source: Nanotechweb.org Events)

ONLINE WEBINAR - Design, Planning and conducting Effective audits by Mark Roberts

Nanotechweb.org Events — Mon, 08 Mar 2010 00:00:00 +0100

Conference: 23 Mar 2010, ONLINE WEBINAR, United States. Organized by Global Compliance Panel. (Source: Nanotechweb.org Events)

Ultrafast Transient Absorption Microscopy Studies of Carrier Dynamics in Epitaxial Graphene.

Nano Letters — Mon, 08 Mar 2010 00:00:00 +0100

Authors: Huang L, Hartland GV, Chu LQ, Luxmi , Feenstra RM, Lian C, Tahy K, Xing H Transient absorption microscopy was employed to image charge carrier dynamics in epitaxial multilayer graphene. The carrier cooling exhibited a biexponential decay that showed a significant dependence on carrier density. The fast and slow relaxation times were assigned to coupling between electrons and optical phonon modes and the hot phonon effect, respectively. The limiting value of the slow relaxation time at high pump intensity reflects the lifetime of the optical phonons. Significant spatial heterogeneity in the dynamics was observed due to differences in coupling between graphene layers and the substrate. PMID: 20210348 [PubMed - as supplied by publisher] (Source: Nano Letters)

Glycerol-Bonded 3C-SiC Nanocrystal Solid Films Exhibiting Broad and Stable Violet to Blue-Green Emission.

Nano Letters — Mon, 08 Mar 2010 00:00:00 +0100

Authors: Wang J, Xiong SJ, Wu XL, Li TH, Chu PK We have produced glycerol-bonded 3C-SiC nanocrystal (NC) films, which when excited by photons of different wavelengths, produce strong and tunable violet to blue-green (360-540 nm) emission as a result of the quantum confinement effects rendered by the 3C-SiC NCs. The emission is so intense that the emission spots are visible to the naked eyes. The light emission is very stable and even after storing in air for more than six months, no intensity degradation can be observed. X-ray photoelectron spectroscopy and absorption fine structure measurements indicate that the Si-terminated NC surfaces are completely bonded to glycerol molecules. Calculations of geometry optimization and electron structures based on the density functional theory for...

Coherent Control of Ballistic Photocurrents in Multilayer Epitaxial Graphene Using Quantum Interference.

Nano Letters — Mon, 08 Mar 2010 00:00:00 +0100

We report generation of ballistic electric currents in unbiased epitaxial graphene at 300 K via quantum interference between phase-controlled cross-polarized fundamental and second harmonic 220 fs pulses. The transient currents are detected via the emitted terahertz radiation. Because of graphene's special structure symmetry, the injected current direction can be well controlled by the polarization of the pump beam in epitaxial graphene. This all optical injection of current provides not only a noncontact way of injecting directional current in graphene but also new insight into optical and transport process in epitaxial graphene. PMID: 20210362 [PubMed - as supplied by publisher] (Source: Nano Letters)

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NanoMaterials 2010

Nanotechweb.org Events — Sat, 06 Mar 2010 16:30:03 +0100

Conference/exhibition: 8 Jun 2010 - 10 Jun 2010, London, United Kingdom. Organized by Intertech Pira . (Source: Nanotechweb.org Events)

Trapping sunlight with silicon nanowires

Nanotechweb.org Your News — Sat, 06 Mar 2010 16:29:08 +0100

(Source: Nanotechweb.org Your News)

Effects of the Nanostructuring of Gold Films upon Their Thermal Stability

ACS Nano — Sat, 06 Mar 2010 11:00:37 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Reversible Attachment of Platinum Alloy Nanoparticles to Nonfunctionalized Carbon Nanotubes

ACS Nano — Fri, 05 Mar 2010 15:48:18 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Water Transport with a Carbon Nanotube Pump

ACS Nano — Fri, 05 Mar 2010 11:00:35 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

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Shot Noise Suppression at Room Temperature in Atomic-Scale Au Junctions.

Nano Letters — Fri, 05 Mar 2010 00:00:00 +0100

Authors: Wheeler PJ, Russom JN, Evans K, King NS, Natelson D Shot noise encodes additional information not directly inferable from simple electronic transport measurements. Previous measurements in atomic-scale metal junctions at cryogenic temperatures have shown suppression of the shot noise at particular conductance values. This suppression demonstrates that transport in these structures proceeds via discrete quantum channels. Using a high-frequency technique, we simultaneously acquire noise data and conductance histograms in Au junctions at room temperature and ambient conditions. We observe noise suppression at up to three conductance quanta, with possible indications of current-induced local heating and 1/f noise in the contact region at high biases. These measurements demonstrate...

Crystal Phase Quantum Dots.

Nano Letters — Fri, 05 Mar 2010 00:00:00 +0100

Authors: Akopian N, Patriarche G, Liu L, Harmand JC, Zwiller V In semiconducting nanowires, both zinc blende and wurtzite(1) crystal structures can coexist.(2-4) The band structure difference between the two structures can lead to charge confinement.(5) Here we fabricate and study single quantum dot devices(6) defined solely by crystal phase in a chemically homogeneous nanowire and observe single photon generation. More generally, our results show that this type of carrier confinement represents a novel degree of freedom in device design at the nanoscale. PMID: 20205446 [PubMed - as supplied by publisher] (Source: Nano Letters)

Artificial Photosynthesis in Ranaspumin-2 Based Foam.

Nano Letters — Fri, 05 Mar 2010 00:00:00 +0100

We present a cell-free artificial photosynthesis platform that couples the requisite enzymes of the Calvin cycle with a nanoscale photophosphorylation system engineered into a foam architecture using the Tungara frog surfactant protein Ranaspumin-2. This unique protein surfactant allowed lipid vesicles and coupled enzyme activity to be concentrated to the microscale Plateau channels of the foam, directing photoderived chemical energy to the singular purpose of carbon fixation and sugar synthesis, with chemical conversion efficiencies approaching 96%. PMID: 20205454 [PubMed - as supplied by publisher] (Source: Nano Letters)

Exfoliation and Characterization of Bismuth Telluride Atomic Quintuples and Quasi-Two-Dimensional Crystals.

Nano Letters — Fri, 05 Mar 2010 00:00:00 +0100

Authors: Teweldebrhan D, Goyal V, Balandin AA Bismuth telluride (Bi(2)Te(3)) and its alloys are the best bulk thermoelectric materials known today. In addition, stacked quasi-two-dimensional (2D) layers of Bi(2)Te(3) were recently identified as promising topological insulators. In this Letter we describe a method for "graphene-inspired" exfoliation of crystalline bismuth telluride films with a thickness of a few atoms. The atomically thin films were suspended across trenches in Si/SiO(2) substrates, and subjected to detail material characterization, which included atomic force microscopy and micro-Raman spectroscopy. The presence of the van der Waals gaps allowed us to disassemble Bi(2)Te(3) crystal into its quintuple building blocks-five monatomic sheets-consisting of Te((1))-Bi-Te((2...

Online Webinar - New Requirements for the Medical Device Directive (MDD) by Albert Cefalo

Nanotechweb.org Events — Fri, 05 Mar 2010 00:00:00 +0100

Conference: 11 Mar 2010, ONLINE WEBINAR, United States. Organized by Global Compliance Panel. (Source: Nanotechweb.org Events)

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OnlineWebinar: Quality Systems Inspection Technique (QSIT), and How to use it to Your Advantage by Jeff Kasoff

Nanotechweb.org Events — Fri, 05 Mar 2010 00:00:00 +0100

Conference: 11 Mar 2010, ONLINE WEBINAR, United States. Organized by Global Compliance Panel. (Source: Nanotechweb.org Events)

Online Webinar : Validating Radiation Sterilization for medical device industries by Mark Roberts

Nanotechweb.org Events — Fri, 05 Mar 2010 00:00:00 +0100

Conference: 9 Mar 2010, Online Webinar, United States. Organized by Global Compliance Panel. (Source: Nanotechweb.org Events)

Online Webinar : Curtailing Microbial Excursions and Investigations in Pharmaceutical Water Systems by Teri C. Soli

Nanotechweb.org Events — Fri, 05 Mar 2010 00:00:00 +0100

Conference: 11 Mar 2010, ONLINE WEBINAR, United States. Organized by Global Compliance Panel. (Source: Nanotechweb.org Events)

Electronic devices: Nanowire transistors made easy

Nature Nanotechnology — Thu, 04 Mar 2010 18:57:05 +0100

Nature Nanotechnology 5, 178 (2010). doi:10.1038/nnano.2010.38 Author: Adrian M. Ionescu A CMOS-capable silicon nanowire transistor has been fabricated without any junctions, simplifying its manufacture and improving its performance relative to traditional devices. (Source: Nature Nanotechnology)

Integrated circuits: Memory grows up

Nature Nanotechnology — Thu, 04 Mar 2010 18:57:05 +0100

Authors: Agostino Pirovano & Klaus Schuegraf Three-dimensional integration may allow for continued improvements in the speed, density and cost of non-volatile memory. (Source: Nature Nanotechnology)

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Fuel cells: Engineering the next generation

Nature Nanotechnology — Thu, 04 Mar 2010 18:57:05 +0100

Nature Nanotechnology 5, 176 (2010). doi:10.1038/nnano.2010.39 Author: Steven K. Buratto A silicon-based membrane for fuel cells offers significant advantages over Nafion-based membranes. (Source: Nature Nanotechnology)

Biosensors: Making nanopores from nanotubes

Nature Nanotechnology — Thu, 04 Mar 2010 18:57:05 +0100

Authors: Zuzanna S. Siwy & Matthew Davenport Single-walled carbon nanotubes can be used to detect single DNA molecules as they pass through the nanotubes under the influence of an applied electric field. (Source: Nature Nanotechnology)

Can graphene set new standards?

Nature Nanotechnology — Thu, 04 Mar 2010 18:57:05 +0100

Authors: Wilfrid Poirier & Félicien Schopfer Very accurate measurements of the quantum Hall effect with massless particles in single sheets of carbon atoms could help metrologists in their efforts to improve the standard for electrical resistance, and possibly even redefine the kilogram. (Source: Nature Nanotechnology)

Research highlights

Nature Nanotechnology — Thu, 04 Mar 2010 18:57:05 +0100

Nature Nanotechnology 5, 170 (2010). doi:10.1038/nnano.2010.43 (Source: Nature Nanotechnology)

Is nanotechnology too broad to practise?

Nature Nanotechnology — Thu, 04 Mar 2010 18:57:05 +0100

Authors: Rebekah A. Drezek & James M. Tour New regulations concerning nanomaterials should consider the details of individual materials, applications and environments to avoid generalizations that might stifle the entire field. (Source: Nature Nanotechnology)

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Mass appeal

Nature Nanotechnology — Thu, 04 Mar 2010 18:57:05 +0100

Nature Nanotechnology 5, 167 (2010). doi:10.1038/nnano.2010.52 Graphene could one day be involved in a new definition of the kilogram. (Source: Nature Nanotechnology)

Glittering prizes

Nature Nanotechnology — Thu, 04 Mar 2010 18:57:05 +0100

Nature Nanotechnology 5, 167 (2010). doi:10.1038/nnano.2010.51 Gold has many applications in nanotechnology and there are plenty more opportunities to explore. (Source: Nature Nanotechnology)

Online Postgraduate Certificate in Nanotechnology, University of Oxford

Nanotechweb.org Events — Thu, 04 Mar 2010 18:53:05 +0100

Course: 9 Oct 2010 - 10 Jul 2011, Online/Oxford, United Kingdom. Organized by University of Oxford. (Source: Nanotechweb.org Events)

Quantum dots measure intracellular chloride ion concentration

Nanotechweb.org journal highlights — Thu, 04 Mar 2010 18:49:57 +0100

Probes exploit inversely proportional relationship between chloride ion concentration and intensity of QD fluorescence (Source: Nanotechweb.org journal highlights)

Avalanche photodetector breaks speed record

Nanotechweb.org News — Thu, 04 Mar 2010 18:46:14 +0100

New design could lead to optical computers (Source: Nanotechweb.org News)

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Role of Surface Cobalt Silicate in Single-Walled Carbon Nanotube Synthesis from Silica-Supported Cobalt Catalysts

ACS Nano — Thu, 04 Mar 2010 15:49:50 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Chemical Vapor Deposition Synthesis of N-, P-, and Si-Doped Single-Walled Carbon Nanotubes

ACS Nano — Thu, 04 Mar 2010 15:49:50 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Ultrasonic-Assisted Nanodimensional Self-Assembly of Poly-3-hexylthiophene for Organic Photovoltaic Cells

ACS Nano — Thu, 04 Mar 2010 15:49:50 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Nanoparticle-Mediated Cytoplasmic Delivery of Proteins To Target Cellular Machinery

ACS Nano — Thu, 04 Mar 2010 15:49:44 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Single-File Diffusion of Confined Water Inside SWNTs: An NMR Study

ACS Nano — Thu, 04 Mar 2010 15:22:42 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

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Biodegradable Click Capsules with Engineered Drug-Loaded Multilayers

ACS Nano — Thu, 04 Mar 2010 15:15:41 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Solution-Grown Silicon Nanowires for Lithium-Ion Battery Anodes

ACS Nano — Thu, 04 Mar 2010 15:14:39 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Robust Block Copolymer Mask for Nanopatterning Polymer Films

ACS Nano — Thu, 04 Mar 2010 15:13:53 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Fundamental Electron-Precursor-Solid Interactions Derived from Time-Dependent Electron-Beam-Induced Deposition Simulations and Experiments

ACS Nano — Thu, 04 Mar 2010 15:08:43 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Evaluation of Transparent Carbon Nanotube Networks of Homogeneous Electronic Type

ACS Nano — Thu, 04 Mar 2010 15:06:04 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

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Lower-Defect Graphene Oxide Nanoribbons from Multiwalled Carbon Nanotubes

ACS Nano — Thu, 04 Mar 2010 15:05:21 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Multilevel Supramolecular Architectures Self-Assembled on Metal Surfaces

ACS Nano — Thu, 04 Mar 2010 15:04:47 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

The 5th International Symposium on Macro- and Supramolecular Architectures and Materials (MAM-10): New Science and Technologies for the Improvement of Human Liv

Nanotechweb.org Events — Thu, 04 Mar 2010 00:00:00 +0100

Conference: 15 Aug 2010 - 21 Aug 2010, Montego Bay, Jamaica. (Source: Nanotechweb.org Events)

Direct Extraction of Photosynthetic Electrons from Single Algal Cells by Nanoprobing System.

Nano Letters — Thu, 04 Mar 2010 00:00:00 +0100

Authors: Ryu W, Bai SJ, Park JS, Huang Z, Moseley J, Fabian T, Fasching RJ, Grossman AR, Prinz FB There are numerous sources of bioenergy that are generated by photosynthetic processes, for example, lipids, alcohols, hydrogen, and polysaccharides. However, generally only a small fraction of solar energy absorbed by photosynthetic organisms is converted to a form of energy that can be readily exploited. To more efficiently use the solar energy harvested by photosynthetic organisms, we evaluated the feasibility of generating bioelectricity by directly extracting electrons from the photosynthetic electron transport chain before they are used to fix CO(2) into sugars and polysaccharides. From a living algal cell, Chlamydomonas reinhardtii, photosynthetic electrons (1.2 pA at 6000 mA/m(2)) ...

Nanoparticle detection of respiratory infection

Wiley Interdisciplinary Reviews: Nanomedicine and Nanobiotechnology — Thu, 04 Mar 2010 00:00:00 +0100

Respiratory viruses are a constant concern for all demographics. Examples include established viruses such as respiratory syncytial virus (RSV), the leading cause of respiratory infection in infants and young children, and emerging viruses such as severe acute respiratory syndrome (SARS), which reached near pandemic levels in 2003, or H1N1 (swine) influenza. Despite this prevalence, traditional methods of virus detection are typically labor intensive and require several days to successfully confirm infection. Recently, however, nanoparticle-based detection strategies have been employed in an effort to develop detection assays that are both sensitive and expedient. Each of these platforms capitalizes on the unique properties of nanoparticles for the detection of respiratory viruses. In this...

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Not Just for Fuel Anymore: Hydrocarbons Can Superconduct, Too

Scientific American Topic - Nanotechnology — Wed, 03 Mar 2010 20:48:00 +0100

Superconductivity is one of those nearly magical properties that seem to defy all intuition for how the physical world ought to work. In a superconductor, electric currents flow without resistance --an electron passes unimpeded through the material like a torpedo through some frictionless ocean. After discovering the phenomenon in 1911 Dutch physicist Heike Kamerlingh Onnes showed that an electric current in a closed superconducting loop of mercury would keep flowing long after the driving potential was removed; he demonstrated his discovery by carrying such a persistent current from the Netherlands to England. [More] (Source: Scientific American Topic - Nanotechnology)

Effect of amlodipine, a calcium channel antagonist, on gonadal steroid of male wistar albino rats

International Journal of Nanomedicine — Wed, 03 Mar 2010 17:17:54 +0100

FC Onwuka, KC Patrick-I wuanyanwu, CK Nnodu, et al (Source: International Journal of Nanomedicine)

Direct writing of ZrO2 and TiO2 nanostructures by photolithography

Nanotechweb.org journal highlights — Wed, 03 Mar 2010 17:17:49 +0100

Sol-gel-based spin-coatable precursor suits direct-write method and offers nanoscale resolution (Source: Nanotechweb.org journal highlights)

Junctionless transistor makes its debut

Nanotechweb.org News — Wed, 03 Mar 2010 17:14:39 +0100

First proposed in 1925, device could revolutionize electronics (Source: Nanotechweb.org News)

Turning ZnO nanowires into ultra-bright UV emitters

Nanotechweb.org journal highlights — Wed, 03 Mar 2010 08:18:10 +0100

Ultraviolet emission enhanced by a factor of almost 50 (Source: Nanotechweb.org journal highlights)

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University, Industry and Impact

Nanotechweb.org Events — Wed, 03 Mar 2010 00:00:00 +0100

Conference: 25 Mar 2010, Uxbridge, Greater London, United Kingdom. Organized by Dr BJ Jones, Experimental Techniques Centre, Brunel University. (Source: Nanotechweb.org Events)

In Situ Observation of Reversible Nanomagnetic Switching Induced by Electric Fields.

Nano Letters — Wed, 03 Mar 2010 00:00:00 +0100

We report direct observation of controlled and reversible switching of magnetic domains using static (dc) electric fields applied in situ during Lorentz microscopy. The switching is realized through electromechanical coupling in thin film Fe(0.7)Ga(0.3)/BaTiO(3) bilayer structures mechanically released from the growth substrate. The domain wall motion is observed dynamically, allowing the direct association of local magnetic ordering throughout a range of applied electric fields. During application of approximately 7-11 MV/m electric fields to the piezoelectric BaTiO(3) film, local magnetic domains rearrange in the ferromagnetic Fe(0.7)Ga(0.3) layer due to the transfer of strain from the BaTiO(3) film. A simulation based on micromagnetic modeling shows a magnetostrictive anisotropy of 25 k...

Knocking Down Highly-Ordered Large-Scale Nanowire Arrays.

Nano Letters — Wed, 03 Mar 2010 00:00:00 +0100

Authors: Pevzner A, Engel Y, Elnathan R, Ducobni T, Ben-Ishai M, Reddy K, Shpaisman N, Tsukernik A, Oksman M, Patolsky F The large-scale assembly of nanowire elements with controlled and uniform orientation and density at spatially well-defined locations on solid substrates presents one of the most significant challenges facing their integration in real-world electronic applications. Here, we present the universal "knocking-down" approach, based on the controlled in-place planarization of nanowire elements, for the formation of large-scale ordered nanowire arrays. The controlled planarization of the nanowires is achieved by the use of an appropriate elastomer-covered rigid-roller device. After being knocked down, each nanowire in the array can be easily addressed electrically, by a sim...

Non-Kolmogorov-Avrami-Ishibashi Switching Dynamics in Nanoscale Ferroelectric Capacitors.

Nano Letters — Wed, 03 Mar 2010 00:00:00 +0100

Authors: Kim Y, Han H, Lee W, Baik S, Hesse D, Alexe M Switching dynamics of nanoscale ferroelectric capacitors with a radius of 35 nm were investigated using piezoresponse force microscopy. Polarization switching starts with only one nucleation event occurring only at the predetermined places. The switching dynamics of nanoscale capacitors did not follow the classical Kolmogorov-Avrami-Ishibashi model. On the basis of the consideration of two separate (nucleation and growth) steps within a nonstatistical finite system, we have proposed a model which is in good agreement with the experimental results. PMID: 20199056 [PubMed - as supplied by publisher] (Source: Nano Letters)

Atomic Structure of Reduced Graphene Oxide.

Nano Letters — Wed, 03 Mar 2010 00:00:00 +0100

Authors: Gómez-Navarro C, Meyer JC, Sundaram RS, Chuvilin A, Kurasch S, Burghard M, Kern K, Kaiser U Using high resolution transmission electron microscopy, we identify the specific atomic scale features in chemically derived graphene monolayers that originate from the oxidation-reduction treatment of graphene. The layers are found to comprise defect-free graphene areas with sizes of a few nanometers interspersed with defect areas dominated by clustered pentagons and heptagons. Interestingly, all carbon atoms in these defective areas are bonded to three neighbors maintaining a planar sp(2)-configuration, which makes them undetectable by spectroscopic techniques. Furthermore, we observe that they introduce significant in-plane distortions and strain in the surrounding lattice. ...

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Formation of Nanopatterned Polymer Blends in Photovoltaic Devices.

Nano Letters — Wed, 03 Mar 2010 00:00:00 +0100

Authors: He X, Gao F, Tu G, Hasko D, Hüttner S, Steiner U, Greenham NC, Friend RH, Huck WT In this paper, we demonstrate a double nanoimprinting process that allows the formation of nanostructured polymer heterojunctions of composition and morphology that can be selected independently. We fabricated photovoltaic (PV) devices with extremely high densities (10(14)/mm(2)) of interpenetrating nanoscale columnar features in the active polymer blend layer. The smallest feature sizes are as small as 25 nm on a 50 nm pitch, which results in a spacing of heterojunctions at or below the exciton diffusion length. Photovoltaic devices based on double-imprinted poly((9,9-dioctylfluorene)-2,7-diyl-alt-[4,7-bis(3-hexylthien-5-yl)-2,1,3-benzothiadiazole]-2',2''-diyl) (F8TBT)/ poly(3-hexylthioph...

Hybrid Carbon Fibers/Carbon Nanotubes Structures for Next Generation Polymeric Composites

Research Letters in Nanotechnology — Tue, 02 Mar 2010 18:15:56 +0100

Pitch-based carbon fibers are commonly used to produce polymeric carbon fiber structural composites. Several investigations have reported different methods for dispersing and subsequently aligning carbon nanotubes (CNTs) as a filler to reinforce polymer matrix. The significant difficulty in dispersing CNTs suggested the controlled-growth of CNTs on surfaces where they are needed. Here we compare between two techniques for depositing the catalyst iron used toward growing CNTs on pitch-based carbon fiber surfaces. Electrochemical deposition of iron using pulse voltametry is compared to DC magnetron iron sputtering. Carbon nanostructures growth was performed using a thermal CVD system. Characterization for comparison between both techniques was compared via SEM, TEM, and Raman spectroscopy an...

Lift-off process integrates viral nanopatterning

Nanotechweb.org journal highlights — Tue, 02 Mar 2010 08:29:48 +0100

Fuel cells, batteries and sensor arrays could benefit from tobacco mosaic virus template (Source: Nanotechweb.org journal highlights)

Crystal control moves towards 3D displays

Nanotechweb.org News — Tue, 02 Mar 2010 08:10:56 +0100

Doping nanocrystals fine tunes emission spectra from green to white and blue (Source: Nanotechweb.org News)