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This page shows you the most recent publications within this specialty of the MedWorm directory.

Understanding the mechanical response of super-stiff supramolecular nanotubes
Level and rate of applied load could be used to adjust polydispersity and length of cyclic structures through fragmentation process (Source: Nanotechweb.org journal highlights)
Source: Nanotechweb.org journal highlights - May 18, 2013 Category: Nanotechnology Source Type: research

Conjugation of Dexamethasone to C60 for the Design of an Anti-Inflammatory Nanomedicine with Reduced Cellular Apoptosis
ACS Applied Materials & InterfacesDOI: 10.1021/am401153k (Source: ACS Applied Materials and Interfaces)
Source: ACS Applied Materials and Interfaces - May 17, 2013 Category: Materials Science Authors: Yi Zhang, Lu Wang, Yanhong Sun, Ying Zhu, Zengtao Zhong, Jiye Shi, Chunhai Fan and Qing Huang Source Type: research

Fenitrothion: an alternative insecticide for the control of deltamethrin‐resistant populations of Triatoma infestans in northern Argentina
Abstract Deltamethrin‐based campaigns to control Triatoma infestans (Klug) (Hemiptera: Reduviidae) have decreased in success as a result of the development of insecticide resistance. We compared the in vitro effects of the pyrethroid deltamethrin and two doses of the organophosphate fenitrothion, presented on different materials, on T. infestans from La Esperanza, Argentina. Laboratory tests demonstrated a decrease in susceptibility to deltamethrin in the field population [LD50: 30.32 nanograms per insect (ng/i)] compared with the reference population (LD50: 0.13 ng/i), giving a high resistance ratio of 233.42. By ...
Source: Medical and Veterinary Entomology - May 17, 2013 Category: Veterinary Research Authors: M. GERMANO, M. I. PICOLLO, C. SPILLMANN, G. MOUGABURE‐CUETO Tags: Original Article Source Type: research

Measurement of ultra-low power oscillators using adaptive drift cancellation with applications to nano-magnetic spin torque oscillators
S. Tamaru and D. S. Ricketts This work presents a technique for measuring ultra-low power oscillator signals using an adaptive drift cancellation method. We demonstrate this technique through spectrum measurements of a sub-pW nano-magnet spin torque oscillator (STO). We first present a detailed noise analysis of the standard ST ... [Rev. Sci. Instrum. 84, 054704 (2013)] published Wed May 15, 2013. (Source: Review of Scientific Instruments)
Source: Review of Scientific Instruments - May 17, 2013 Category: Physics Source Type: research

A high-impedance attenuator for measurement of high-voltage nanosecond-range pulses
Binxiong Yu, Jinliang Liu, Tianyang Zhang, and Zhiqiang Hong A novel kind of high-impedance cable attenuator for measurement of high-voltage ns-range pulses is investigated in this paper. The input and output ports of the proposed attenuator were both high-impedance ports, and good pulse response characteristics of the proposed attenuator were obtained with p ... [Rev. Sci. Instrum. 84, 055111 (2013)] published Wed May 15, 2013. (Source: Review of Scientific Instruments)
Source: Review of Scientific Instruments - May 17, 2013 Category: Physics Source Type: research

Sensitive thermal transitions of nanoscale polymer samples using the bimetallic effect: Application to ultra-thin polythiophene
O. Ahumada, M. M. Perez-Madrigal, J. Ramirez, D. Curco, C. Esteves et al. A sensitive nanocalorimetric technology based on microcantilever sensors is presented. The technology, which combines very short response times with very small sample consumption, uses the bimetallic effect to detect thermal transitions. Specifically, abrupt variations in the Young's modulus and the ... [Rev. Sci. Instrum. 84, 053904 (2013)] published Wed May 15, 2013. (Source: Review of Scientific Instruments)
Source: Review of Scientific Instruments - May 17, 2013 Category: Physics Source Type: research

Functionalization of carbon nanotubes with CH, NH fragments, COOH and OH groups
We present results of extensive theoretical studies concerning stability, morphology, and band structure of single wall carbon nanotubes (CNTs) covalently functionalized by CH (for n = 2,3,4), NH (for n = 1,2,3,4), COOH, and OH groups. These studies are based on ab initio calculations in the framewo ... [J. Chem. Phys. 138, 194704 (2013)] published Thu May 16, 2013. (Source: Journal of Chemical Physics)
Source: Journal of Chemical Physics - May 17, 2013 Category: Physics Source Type: research

Electronic structure and quantum dynamics of photoinitiated dissociation of O on rutile TiO nanocluster
Pratik P. Dholabhai and Hua-Gen Yu The adsorption and photoinitiated dissociation of molecular oxygen on reduced rutile TiO nanocluster have been studied using a hybrid density functional theory (DFT)/time-dependent DFT approach and a time-dependent wavepacket dynamics method. Results show that the most favorable state for O at the b ... [J. Chem. Phys. 138, 194705 (2013)] published Thu May 16, 2013. (Source: Journal of Chemical Physics)
Source: Journal of Chemical Physics - May 17, 2013 Category: Physics Source Type: research

Numerical study of a slip-link model for polymer melts and nanocomposites
We present a numerical study of the slip link model introduced by Likhtman for describing the dynamics of dense polymer melts. After reviewing the technical aspects associated with the implementation of the model, we extend previous work in several directions. The dependence of the relaxation modulu ... [J. Chem. Phys. 138, 194902 (2013)] published Wed May 15, 2013. (Source: Journal of Chemical Physics)
Source: Journal of Chemical Physics - May 17, 2013 Category: Physics Source Type: research

The ethyl radical in superfluid helium nanodroplets: Rovibrational spectroscopy and ab initio computations
Paul L. Raston, Jay Agarwal, Justin M. Turney, Henry F. Schaefer, III, and Gary E. Douberly The ethyl radical has been isolated and spectroscopically characterized in He nanodroplets. The band origins of the five CH stretch fundamentals are shifted by < 2 cm from those reported for the gas phase species [S. Davis, D. Uy, and D. J. Nesbitt, J. Chem. Phys. 112, 1823 (2000); T. Haber, A. C. B ... [J. Chem. Phys. 138, 194303 (2013)] published Wed May 15, 2013. (Source: Journal of Chemical Physics)
Source: Journal of Chemical Physics - May 17, 2013 Category: Physics Source Type: research

Water nanodroplets: Predictions of five model potentials
Sergey Kazachenko and Ajit J. Thakkar Putative global minima for five intermolecular potential energy models are reported for water clusters (HO) with n (Source: Journal of Chemical Physics)
Source: Journal of Chemical Physics - May 17, 2013 Category: Physics Source Type: research

Conformational isomerisms and nano-aggregation in substituted alkylammonium nitrates ionic liquids: An x-ray and computational study of 2-methoxyethylammonium nitrate
In this study, we discuss, using molecular dynamics simulations and energy-dispersive x-ray diffraction data, how a conformational isomerism can dramatically alter the nanosegregation phenomena that take place in a prototypical ionic liquid. The diffraction patterns of liquid 2-methoxyethylammonium ... [J. Chem. Phys. 138, 184506 (2013)] published Tue May 14, 2013. (Source: Journal of Chemical Physics)
Source: Journal of Chemical Physics - May 17, 2013 Category: Physics Source Type: research

Density functional theory study of the organic functionalization of hydrogenated silicene
Pamela Rubio-Pereda and Noboru Takeuchi Silicene, the silicon analogous of graphene, is a newly synthesized two-dimensional nanomaterial, with unique features and promising potential applications. In this paper we present density functional theory calculations of the organic functionalization of hydrogenated silicene with acetylene, ethyl ... [J. Chem. Phys. 138, 194702 (2013)] published Thu May 16, 2013. (Source: Journal of Chemical Physics)
Source: Journal of Chemical Physics - May 17, 2013 Category: Physics Source Type: research

Three dimensional numerical study on the efficiency of a core-shell InGaN/GaN multiple quantum well nanowire light-emitting diodes
Chi-Kang Li, Hung-Chih Yang, Ta-Cheng Hsu, Yu-Jiun Shen, Ai-Sen Liu et al. This paper presents the findings of investigating core-shell multiple quantum well nanowire light-emitting diodes (LEDs). A fully self-consistent three dimensional model that solves Poisson and drift-diffusion equations was employed to investigate the current flow and quantum-confined stark effect. ... [J. Appl. Phys. 113, 183104 (2013)] published Mon May 13, 2013. (Source: Journal of Applied Physics)
Source: Journal of Applied Physics - May 17, 2013 Category: Physics Source Type: research

Controlled synthesis of buried delta-layers of Ag nanocrystals for near-field plasmonic effects on free surfaces
We report on the shallow synthesis by low energy ion implantation of delta-layers of Ag nanocrystals in SiO at few nanometers under its free surface. Transmission electron microscopy observations, ballistic simulations, and reflectance measurements are coupled to define the conditions for which the ... [J. Appl. Phys. 113, 193505 (2013)] published Thu May 16, 2013. (Source: Journal of Applied Physics)
Source: Journal of Applied Physics - May 17, 2013 Category: Physics Source Type: research

Polarization properties of single and ensembles of InAs/InP quantum rod nanowires emitting in the telecom wavelengths
R. Anufriev, N. Chauvin, H. Khmissi, K. Naji, J.-B. Barakat et al. The absorption and emission polarization properties of InAs quantum rods embedded in InP nanowires (NWs) are investigated by mean of (micro-)photoluminescence spectroscopy. It is shown that the degree of linear polarization of emission (0.94) and absorption (0.5) of a single NW can be explained by t ... [J. Appl. Phys. 113, 193101 (2013)] published Wed May 15, 2013. (Source: Journal of Applied Physics)
Source: Journal of Applied Physics - May 17, 2013 Category: Physics Source Type: research

Voltage-driven perpendicular magnetic domain switching in multiferroic nanoislands
Jia-Mian Hu, T. N. Yang, L. Q. Chen, and C. W. Nan We show that, using phase-field simulations, large voltage-driven perpendicular magnetic domain switching can be realized in magnetic-ferroelectric nanoislands with relieved substrate constraint, which is difficult in continuous multiferroic layered thin films due to significant substrate clamping. ... [J. Appl. Phys. 113, 194301 (2013)] published Wed May 15, 2013. (Source: Journal of Applied Physics)
Source: Journal of Applied Physics - May 17, 2013 Category: Physics Source Type: research

Ferromagnetism, adatom effect, and edge reconstruction induced by Klein boundary in graphene nanoribbons
Zhi-qiang Bao, Jun-jie Shi, and Min Zhang The electronic structure and magnetic characteristics of Klein graphene nanoribbons (KGNRs), as observed by Suenaga and Koshino [K. Suenaga and M. Koshino, Nature 468, 1088 (2010)], are investigated using first-principles calculations. We find three new characteristics induced by the Klein boundary. ... [J. Appl. Phys. 113, 194302 (2013)] published Wed May 15, 2013. (Source: Journal of Applied Physics)
Source: Journal of Applied Physics - May 17, 2013 Category: Physics Source Type: research

Progressive structural and electronic properties of nano-structured carbon atomic chains
D. Usanmaz and G. P. Srivastava Ab initio calculations, based on the planewave pseudopotential method and the density functional theory, have been reported on the changes in the electronic and structural properties of short carbon atomic chains held rigidly between hydrogenated thin armchair graphene nanoribbons (N-AGNR) of dimer ... [J. Appl. Phys. 113, 193704 (2013)] published Thu May 16, 2013. (Source: Journal of Applied Physics)
Source: Journal of Applied Physics - May 17, 2013 Category: Physics Source Type: research

Size dependent magnetic and dielectric properties of nano CoFeO prepared by a salt assisted gel-combustion method
K. Vasundhara, S. N. Achary, S. K Deshpande, P. D. Babu, S. S. Meena et al. In this communication, we report the preparation and properties of nano-CoFeO by gel combustion in presence of KCl and subsequent heat treatments. The products were characterized by X-ray diffraction, Infrared spectroscopy, and Mossbauer Spectroscopy. Spinel type structure with all Fe in 3+ oxidatio ... [J. Appl. Phys. 113, 194101 (2013)] published Wed May 15, 2013. (Source: Journal of Applied Physics)
Source: Journal of Applied Physics - May 17, 2013 Category: Physics Source Type: research

Controlling the optical scattering of plasmonic nanoparticles using a thin dielectric layer
A. W. Powell, M. B. Wincott, A. A. R. Watt, H. E. Assender, and J. M. Smith The effect of a thin dielectric film on the plasmonic behaviour of metal nanoparticles (MNPs) above a high refractive index substrate is explored. Using finite-difference time domain simulations, the optical properties of Ag nanoparticles are investigated as a function of film thickness, refractive ... [J. Appl. Phys. 113, 184311 (2013)] published Tue May 14, 2013. (Source: Journal of Applied Physics)
Source: Journal of Applied Physics - May 17, 2013 Category: Physics Source Type: research

Electrical conductivity of single-wall carbon nanotube films in strong electric field
D. Seliuta, L. SubaCius, I. Kasalynas, M. Shuba, A. Paddubskaya et al. Carrier transport features in single-wall carbon nanotube (SWCNT) films under strong electric fields (up to 10 V/cm) are presented. Application of electrical pulses of nanosecond duration allowed to minimize Joule heating and resolve intrinsic nonlinearities with the electric field. Investigations w ... [J. Appl. Phys. 113, 183719 (2013)] published Tue May 14, 2013. (Source: Journal of Applied Physics)
Source: Journal of Applied Physics - May 17, 2013 Category: Physics Source Type: research

First-principles study of edge-modified armchair graphene nanoribbons
Hideyuki Jippo and Mari Ohfuchi We have used first-principles methods to study the geometries and electronic structures of hydrogen (H), fluorine (F), chlorine (Cl), and hydroxyl (OH) terminated armchair graphene nanoribbons (H-AGNRs, F-AGNRs, Cl-AGNRs, and OH-AGNRs) with ribbon widths N = 7 and 19. The most stable geometries of H ... [J. Appl. Phys. 113, 183715 (2013)] published Mon May 13, 2013. (Source: Journal of Applied Physics)
Source: Journal of Applied Physics - May 17, 2013 Category: Physics Source Type: research

Mesoscopic analysis of leakage current suppression in ZrO/AlO/ZrO nano-laminates
Dominik Martin, Matthias Grube, Wenke Weinreich, Johannes Muller, Walter M. Weber et al. Metal-Insulator-Metal capacitors, with ZrO/AlO/ZrO (ZAZ)-nanolaminate thin-films as a dielectric layer, exhibit reduced leakage currents compared to corresponding capacitors based on pure ZrO while maintaining a sufficiently high dielectric constant for the DRAM application. This work is a comparati ... [J. Appl. Phys. 113, 194103 (2013)] published Wed May 15, 2013. (Source: Journal of Applied Physics)
Source: Journal of Applied Physics - May 17, 2013 Category: Physics Source Type: research

Flexoelectric effect on the electroelastic responses of bending piezoelectric nanobeams
Z. Yan and L. Y. Jiang Flexoelectricity, referring to a spontaneous electric polarization induced by strain gradient in dielectrics, presents a strong size dependency at the nanoscale. In the current work, the influence of the flexoelectric effect on the mechanical and electrical properties of bending piezoelectric nanobe ... [J. Appl. Phys. 113, 194102 (2013)] published Wed May 15, 2013. (Source: Journal of Applied Physics)
Source: Journal of Applied Physics - May 17, 2013 Category: Physics Source Type: research

Performance limits of transition metal dichalcogenide (MX) nanotube surround gate ballistic field effect transistors
Amretashis Sengupta and Santanu Mahapatra We theoretically analyze the performance of transition metal dichalcogenide (MX) single wall nanotube (SWNT) surround gate MOSFET, in the 10 nm technology node. We consider semiconducting armchair (n, n) SWNT of MoS, MoSe, WS, and WSe for our study. The material properties of the nanotubes are evalu ... [J. Appl. Phys. 113, 194502 (2013)] published Thu May 16, 2013. (Source: Journal of Applied Physics)
Source: Journal of Applied Physics - May 17, 2013 Category: Physics Source Type: research

The role of surface states in modification of carrier transport in silicon nanowires
Kamran Rasool, M. A. Rafiq, Mushtaq Ahmad, Zahid Imran, and M. M. Hasan We investigate transport properties of polyacrylic acid (PAA) capped n and p-type silicon nanowire (SiNW) arrays. PAA diluted with deionized water at different concentrations was spun directly on vertically grown SiNW arrays prepared by metal assisted electroless chemical etching. PAA provides mecha ... [J. Appl. Phys. 113, 193703 (2013)] published Thu May 16, 2013. (Source: Journal of Applied Physics)
Source: Journal of Applied Physics - May 17, 2013 Category: Physics Source Type: research

Thermal conductivity of a ZnO nanowire/silica aerogel nanocomposite
Jing Xie, Anthony Frachioni, D. S. Williams, and B. E. White, Jr. The thermal conductivity of 100 nm zinc oxide nanowires embedded in silica aerogel was measured using the 3omega method over a temperature range of 150 K to 300 K. Compared to 100 nm ZnO nanowires alone, the thermal conductivity of the nanocomposite was reduced by over an order of magnitude througho ... [Appl. Phys. Lett. 102, 193101 (2013)] published Mon May 13, 2013. (Source: Applied Physics Letters)
Source: Applied Physics Letters - May 17, 2013 Category: Physics Source Type: research

Advanced high-k gate dielectric amorphous LaGdO gated metal-oxide-semiconductor devices with sub-nanometer equivalent oxide thickness
S. P. Pavunny, P. Misra, R. Thomas, A. Kumar, J. Schubert et al. Careful selection of pulsed laser deposition conditions was executed to achieve sub-nanometer EOT (equivalent oxide thickness) in amorphous LaGdO based high-k/metal gate stacks. The lowest EOTs attained were ~5.4 A and 8.4 A with and without quantum mechanical correction, respectively. The electrica ... [Appl. Phys. Lett. 102, 192904 (2013)] published Tue May 14, 2013. (Source: Applied Physics Letters)
Source: Applied Physics Letters - May 17, 2013 Category: Physics Source Type: research

A carbon nanotube based ammonia sensor on cotton textile
Jin-Woo Han, Beomseok Kim, Jing Li, and M. Meyyappan A single-wall carbon nanotube (CNT) based ammonia (NH) sensor was implemented on a cotton yarn. Two types of sensors were fabricated: Au/sensing CNT/Au and conducting/sensing/conducting all CNT structures. Two perpendicular Au wires were designed to contact CNT-cotton yarn for metal-CNT sensor, wher ... [Appl. Phys. Lett. 102, 193104 (2013)] published Tue May 14, 2013. (Source: Applied Physics Letters)
Source: Applied Physics Letters - May 17, 2013 Category: Physics Source Type: research

Multiple current peaks in room-temperature atmospheric pressure homogenous dielectric barrier discharge plasma excited by high-voltage tunable nanosecond pulse in air
De-Zheng Yang (杨德正), Wen-Chun Wang (王文春), Shuai Zhang (张帅), Kai Tang (唐凯), Zhi-jie Liu (刘志杰) et al. Room temperature homogenous dielectric barrier discharge plasma with high instantaneous energy efficiency is acquired by using nanosecond pulse voltage with 20200 ns tunable pulse width. Increasing the voltage pulse width can lead to the generation of regular and stable multiple current peaks in eac ... [Appl. Phys. Lett. 102, 194102 (2013)] published Tue May 14, 2013. (Source: Applied Physics Letters)
Source: Applied Physics Letters - May 17, 2013 Category: Physics Source Type: research

Thermal conductivity of low temperature grown vertical carbon nanotube bundles measured using the three-omega method
Sten Vollebregt, Sourish Banerjee, Kees Beenakker, and Ryoichi Ishihara The thermal conductivity of as-grown vertical multi-walled carbon nanotubes (CNT) bundles fabricated at low temperature (500 degrees C) was measured using a vertical 3omega-method. For this, CNT were selectively grown inside an oxide opening and sandwiched between two metal electrodes. The validity ... [Appl. Phys. Lett. 102, 191909 (2013)] published Wed May 15, 2013. (Source: Applied Physics Letters)
Source: Applied Physics Letters - May 17, 2013 Category: Physics Source Type: research

Configurational anisotropic spin waves in cross-shaped NiFe nanoelements
B. K. Mahato, B. Rana, R. Mandal, D. Kumar, S. Barman et al. Optically induced spin waves in NiFe (permalloy) cross-shaped nanoelements are studied by time-resolved magneto-optical Kerr effect microscope. A strong anisotropy in the spin wave modes are observed with the orientation angle (phi) of the in-plane bias magnetic field. As phi deviates from 0 degrees ... [Appl. Phys. Lett. 102, 192402 (2013)] published Mon May 13, 2013. (Source: Applied Physics Letters)
Source: Applied Physics Letters - May 17, 2013 Category: Physics Source Type: research

Broadband saturable absorption and optical limiting in graphene-polymer composites
S. Husaini, J. E. Slagle, J. M. Murray, S. Guha, L. P. Gonzalez et al. Nonlinear optical properties of a graphene-polyvinyl alcohol composite are studied using an irradiance-scan setup. The measurements are carried out at 785 nm and 1064 nm in the nanosecond and picoseconds temporal regimes, respectively. It is shown that the output fluence readily clamps with increasi ... [Appl. Phys. Lett. 102, 191112 (2013)] published Wed May 15, 2013. (Source: Applied Physics Letters)
Source: Applied Physics Letters - May 17, 2013 Category: Physics Source Type: research

Coupling of InAs/InP quantum dots to the plasmon resonance of In nanoparticles grown by metal-organic vapor phase epitaxy
We report strongly modified optical emission of InAs/InP quantum dots (QDs) coupled to the surface plasmon resonance (SPR) of In nanoparticles grown by metal-organic vapor phase epitaxy. With increasing In deposition time, the In nanoparticle size increases and the SPR redshifts significantly. When ... [Appl. Phys. Lett. 102, 191111 (2013)] published Wed May 15, 2013. (Source: Applied Physics Letters)
Source: Applied Physics Letters - May 17, 2013 Category: Physics Source Type: research

ZnO-SiO solar-blind photodetectors on flexible polyethersulfone substrate with organosilicon buffer layer
Wei-Chih Lai, Jiun-Ting Chen, and Ya-Yu Yang The ZnO-SiO nanocomposite solar-blind metal-semiconductor-metal photodetectors (PDs) on flexible polyethersulfone (PES) with an organosilicon (SiO(CH)) buffer layer improved the 10 V-biased responsivity of PDs illuminated wavelength of 240 nm from 0.75 A/W (without SiO(CH) buffer layer) to 3.86 A/W ... [Appl. Phys. Lett. 102, 191115 (2013)] published Thu May 16, 2013. (Source: Applied Physics Letters)
Source: Applied Physics Letters - May 17, 2013 Category: Physics Source Type: research

High quality factor nonpolar GaN photonic crystal nanocavities
Tzeng-Tsong Wu, Sheng-Yun Lo, Huei-Min Huang, Che-Wei Tsao, Tien-Chang Lu et al. High quality factor a-plane nonpolar GaN two-dimensional photonic crystal (PC) nanocavities on r-plane sapphire substrates have been demonstrated. Nonpolar GaN PC nanocavities on a thin membrane structure were realized by using e-beam lithography to define the PC patterns and focused-ion beam millin ... [Appl. Phys. Lett. 102, 191116 (2013)] published Thu May 16, 2013. (Source: Applied Physics Letters)
Source: Applied Physics Letters - May 17, 2013 Category: Physics Source Type: research

Polymer-dispersed liquid crystal doped with carbon nanotubes for dimethyl methylphosphonate vapor-sensing application
Yu-Tse Lai, Jui-Chang Kuo, and Yao-Joe Yang This paper proposes a sensitive gas sensor composed of polymer-dispersed liquid crystal (PDLC) for dimethyl methylphosphonate (DMMP) detection. The sensing element comprises a PDLC sensing film doped with carbon nanotubes (CNT-PDLC) and a planar interdigital electrode pair. The concentration of DMMP ... [Appl. Phys. Lett. 102, 191912 (2013)] published Thu May 16, 2013. (Source: Applied Physics Letters)
Source: Applied Physics Letters - May 17, 2013 Category: Physics Source Type: research

Nb nano superconducting quantum interference devices with high spin sensitivity for operation in magnetic fields up to 0.5 T
R. Wolbing, J. Nagel, T. Schwarz, O. Kieler, T. Weimann et al. We investigate electric transport and noise properties of microstrip-type submicron direct current superconducting quantum interference devices (dc SQUIDs) based on Nb thin films and overdamped Josephson junctions with a HfTi barrier. The SQUIDs were designed for optimal spin sensitivity S upon oper ... [Appl. Phys. Lett. 102, 192601 (2013)] published Tue May 14, 2013. (Source: Applied Physics Letters)
Source: Applied Physics Letters - May 17, 2013 Category: Physics Source Type: research

Intrinsic and extrinsic origins of low-frequency noise in GaAs/AlGaAs Schottky-gated nanostructures
Kenichi Hitachi, Takeshi Ota, and Koji Muraki We study low-frequency noise in current passing through quantum point contacts fabricated from several GaAs/AlGaAs heterostructures with different layer structures and fabrication processes. In contrast to previous reports, there is no gate-dependent random telegraph noise (RTN) originating from tun ... [Appl. Phys. Lett. 102, 192104 (2013)] published Tue May 14, 2013. (Source: Applied Physics Letters)
Source: Applied Physics Letters - May 17, 2013 Category: Physics Source Type: research

Perfect surface crystallization and parasitic structures in nonstoichiometric glass-ceramics: Micro-/nanoscopic aspects
Yoshihiro Takahashi, Yoshiki Yamazaki, Rie Ihara, and Takumi Fujiwara Uniform and highly oriented crystalline layers with submillimeter thickness have been demonstrated recently by crystallization in nonstoichiometric precursor glass, i.e., perfectly surface-crystallized glass-ceramics (PSC-GCs). Although the origin of PSC in the SrOTiOSiO system was interpreted by th ... [Appl. Phys. Lett. 102, 191903 (2013)] published Tue May 14, 2013. (Source: Applied Physics Letters)
Source: Applied Physics Letters - May 17, 2013 Category: Physics Source Type: research

Residual strain and piezoelectric effects in passivated GaAs/AlGaAs core-shell nanowires
Moira Hocevar, Le Thuy Thanh Giang, Rudeesun Songmuang, Martien den Hertog, Lucien Besombes et al. We observe a systematic red shift of the band-edge of passivated GaAs/AlGaAs core-shell nanowires with increasing shell thickness up to 100 nm. The shift is detected both in emission and absorption experiments, reaching values up to 14 meV for the thickest shell nanowires. Part of this red shift is ... [Appl. Phys. Lett. 102, 191103 (2013)] published Mon May 13, 2013. (Source: Applied Physics Letters)
Source: Applied Physics Letters - May 17, 2013 Category: Physics Source Type: research

Optical time domain reflectometry with low noise waveguide-coupled superconducting nanowire single-photon detectors
C. Schuck, W. H. P. Pernice, X. Ma, and H. X. Tang We demonstrate optical time domain reflectometry over 200 km of optical fiber using low-noise NbTiN superconducting single-photon detectors integrated with SiN waveguides. Our small detector footprint enables high timing resolution of 50 ps and a dark count rate of 3 Hz with unshielded fibers, allow ... [Appl. Phys. Lett. 102, 191104 (2013)] published Mon May 13, 2013. (Source: Applied Physics Letters)
Source: Applied Physics Letters - May 17, 2013 Category: Physics Source Type: research

Tailoring palladium nanocontacts by electromigration
Libe Arzubiaga, Federico Golmar, Roger Llopis, Felix Casanova, and Luis E. Hueso Electromigration is employed in nanoelectronics for transforming narrow metallic wires into electrodes separated by a few nanometers gap. In this work, we fabricate either nanoconstrictions or nanogap electrodes by performing electromigration in palladium nanowires. The device resistance and the cro ... [Appl. Phys. Lett. 102, 193103 (2013)] published Mon May 13, 2013. (Source: Applied Physics Letters)
Source: Applied Physics Letters - May 17, 2013 Category: Physics Source Type: research

Improving information density in ferroelectric polymer films by using nanoimprinted gratings
D. E. Martinez-Tong, M. Soccio, M. C. Garcia-Gutierrez, A. Nogales, D. R. Rueda et al. In this work, well-defined low aspect ratio nanostructures based on nanogratings on thin films of poly(vinylidene fluoridetrifluoroethylene) copolymers were prepared. By using these nanogratings, an improved management of writing and reading information of about 500 Gbit/in. (0.01 bit/nm) can be rea ... [Appl. Phys. Lett. 102, 191601 (2013)] published Mon May 13, 2013. (Source: Applied Physics Letters)
Source: Applied Physics Letters - May 17, 2013 Category: Physics Source Type: research

Electron transport in nano-scaled piezoelectronic devices
Zhengping Jiang, Marcelo A. Kuroda, Yaohua Tan, Dennis M. Newns, Michael Povolotskyi et al. The Piezoelectronic Transistor (PET) has been proposed as a post-CMOS device for fast, low-power switching. In this device, the piezoresistive channel is metalized via the expansion of a relaxor piezoelectric element to turn the device on. The mixed-valence compound SmSe is a good choice of PET chan ... [Appl. Phys. Lett. 102, 193501 (2013)] published Mon May 13, 2013. (Source: Applied Physics Letters)
Source: Applied Physics Letters - May 17, 2013 Category: Physics Source Type: research

Increased open-circuit voltage in a Schottky device using PbS quantum dots with extreme confinement
Hyekyoung Choi, Jun Kwan Kim, Jung Hoon Song, Youngjo Kim, and Sohee Jeong We fabricated the PbS nanocrystal quantum dots (NQDs) based Schottky structure device (ITO/PbS/LiF/Al) with varying bandgap of NQDs from 0.8 to 2.2 eV. The open-circuit voltage increased monotonically with NQD's bandgap until 0.67 V, achieved using extremely confined, 1.5 nm sized-PbS NQDs. The powe ... [Appl. Phys. Lett. 102, 193902 (2013)] published Mon May 13, 2013. (Source: Applied Physics Letters)
Source: Applied Physics Letters - May 17, 2013 Category: Physics Source Type: research

Direct observation of nanometer-scale Joule and Peltier effects in phase change memory devices
Kyle L. Grosse, Feng Xiong, Sungduk Hong, William P. King, and Eric Pop We measure power dissipation in phase change memory (PCM) devices by scanning Joule expansion microscopy (SJEM) with ~50 nm spatial and 0.2 K temperature resolution. The temperature rise in the GeSbTe (GST) is dominated by Joule heating, but at the GST-TiW contacts it is a combination of Peltier and ... [Appl. Phys. Lett. 102, 193503 (2013)] published Mon May 13, 2013. (Source: Applied Physics Letters)
Source: Applied Physics Letters - May 17, 2013 Category: Physics Source Type: research

Highly efficient inverted polymer solar cells with reduced graphene-oxide-zinc-oxide nanocomposites buffer layer
In this study, we reported a 36% improvement in the performance of inverted solar cells as a result of increased short-circuit current (J) obtained using a composition of zinc oxide (ZnO) and reduced graphene oxide (RGO) as an n-type buffer layer. RGO-ZnO nanocomposites show higher electron conducti ... [Appl. Phys. Lett. 102, 193903 (2013)] published Mon May 13, 2013. (Source: Applied Physics Letters)
Source: Applied Physics Letters - May 17, 2013 Category: Physics Source Type: research