Filtered By:
Source: Sensors

This page shows you your search results in order of relevance.

Order by Relevance | Date

Total 2011 results found since Jan 2013.

Sensors, Vol. 22, Pages 3639: The Influence of Air Humidity on the Output Signal from an Ionization Smoke Detector in the Presence of Soot Nanoparticles
ubiak In 2019, the European Committee for Standardization (CEN) initiated work on the preparation of a strategy for air quality monitoring at workplaces. The aim was to determine the concentrations of nano-objects and their aggregates and agglomerates (NOAA) by means of direct measurements using low-cost sensors. There is a growing need for low-cost devices that can continuously monitor the concentrations of nanoparticles, and that can be installed where nanoparticles are used or created spontaneously. In search of such a device, in this study, a smoke detector with an ionization sensor was tested. The aim of the resea...
Source: Sensors - May 10, 2022 Category: Biotechnology Authors: Tomasz Jankowski Piotr Sobiech Szymon Jakubiak Tags: Article Source Type: research

Sensors, Vol. 22, Pages 5780: Electrochemical Sensor Based on Iron(II) Phthalocyanine and Gold Nanoparticles for Nitrite Detection in Meat Products
V. Basova Nitrites are widely used in the food industry, particularly for the preservation of meat products. Controlling the nitrate content in food is an important task to ensure people’s health is not at risk; therefore, the search for, and research of, new materials that will modify the electrodes in the electrochemical sensors that detect and control the nitrate content in food products is an urgent task. In this paper, we describe the electrochemical behavior of a glass carbon electrode (GCE), modified with a Fe(II) tetra-tert-butyl phthalocyanine film (FePc(tBu)4/GCE), and decorated with gold nanopa...
Source: Sensors - August 2, 2022 Category: Biotechnology Authors: Svetlana I. Dorovskikh Darya D. Klyamer Anastasiya D. Fedorenko Natalia B. Morozova Tamara V. Basova Tags: Article Source Type: research

Sensors, Vol. 21, Pages 2290: Integration of 3D Hydrodynamic Focused Microreactor with Microfluidic Chemiluminescence Sensing for Online Synthesis and Catalytical Characterization of Gold Nanoparticles
del Chemiluminescence assays have shown great advantages compared with other optical techniques. Gold nanoparticles have drawn much attention in chemiluminescence analysis systems as an enzyme-free catalyst. The catalytic activity of gold nanoparticles for chemiluminescence sensing depends on size, shape and the surface charge property, which is hard to characterize in batches. As there is no positive or negative correlation between chemiluminescence signals and sizes of gold nanoparticles, the best way to get optimal gold nanoparticles is to control the reaction conditions via online chemiluminescence sensing systems....
Source: Sensors - March 25, 2021 Category: Biotechnology Authors: Yanwei Wang Michael Seidel Tags: Article Source Type: research

Sensors, Vol. 15, Pages 21427-21477: Biomedical Probes Based on Inorganic Nanoparticles for Electrochemical and Optical Spectroscopy Applications
This article highlights various kinds of inorganic nanoparticles, including metal nanoparticles, magnetic nanoparticles, nanocomposites, and semiconductor nanoparticles that can be perceived as useful materials for biomedical probes and points to the outstanding results arising from their use in such probes. The progress in the use of inorganic nanoparticle-based electrochemical, colorimetric and spectrophotometric detection in recent applications, especially bioanalysis, and the main functions of inorganic nanoparticles in detection are reviewed. The article begins with a conceptual discussion of nanoparticles according t...
Source: Sensors - August 28, 2015 Category: Biotechnology Authors: Abdulhadee YakohChanika PinyorospathumWeena SiangprohOrawon Chailapakul Tags: Review Source Type: research

Sensors, Vol. 19, Pages 3396: Characterization and Relaxation Properties of a Series of Monodispersed Magnetic Nanoparticles
g Liu Magnetic iron oxide nanoparticles are relatively advanced nanomaterials, and are widely used in biology, physics and medicine, especially as contrast agents for magnetic resonance imaging. Characterization of the properties of magnetic nanoparticles plays an important role in the application of magnetic particles. As a contrast agent, the relaxation rate directly affects image enhancement. We characterized a series of monodispersed magnetic nanoparticles using different methods and measured their relaxation rates using a 0.47 T low-field Nuclear Magnetic Resonance instrument. Generally speaking, the properties of...
Source: Sensors - August 1, 2019 Category: Biotechnology Authors: Yapeng Zhang Jingjing Cheng Wenzhong Liu Tags: Article Source Type: research

Sensors, Vol. 20, Pages 5590: Functionalized Fluorescent Silica Nanoparticles for Bioimaging of Cancer Cells
rtínez Functionalized fluorescent silica nanoparticles were designed and synthesized to selectively target cancer cells for bioimaging analysis. The synthesis method and characterization of functionalized fluorescent silica nanoparticles (50–60 nm), as well as internalization and subcellular localization in HeLa cells is reported here. The dye, rhodamine 101 (R101) was physically embedded during the sol–gel synthesis. The dye loading was optimized by varying the synthesis conditions (temperature and dye concentration added to the gel) and by the use of different organotriethoxysilanes as a ...
Source: Sensors - September 28, 2020 Category: Biotechnology Authors: Ruth Prieto-Montero Alberto Katsumiti Miren Pilare Cajaraville I ñigo López-Arbeloa Virginia Mart ínez-Martínez Tags: Article Source Type: research

Sensors, Vol. 16, Pages 1851: In Vivo Neural Recording and Electrochemical Performance of Microelectrode Arrays Modified by Rough-Surfaced AuPt Alloy Nanoparticles with Nanoporosity
In order to reduce the impedance and improve in vivo neural recording performance of our developed Michigan type silicon electrodes, rough-surfaced AuPt alloy nanoparticles with nanoporosity were deposited on gold microelectrode sites through electro-co-deposition of Au-Pt-Cu alloy nanoparticles, followed by chemical dealloying Cu. The AuPt alloy nanoparticles modified gold microelectrode sites were characterized by scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV) and in vivo neural recording experiment. The SEM images showed that the prepared AuPt alloy nanoparticle...
Source: Sensors - November 2, 2016 Category: Biotechnology Authors: Zongya Zhao Ruxue Gong Liang Zheng Jue Wang Tags: Article Source Type: research

Sensors, Vol. 18, Pages 2818: Plasmonic-Ceria Nanoparticles as Fluorescence Intensity and Lifetime Quenching Optical Sensor
andas Ceria nanoparticles have been recently used as an optical fluorescent material with visible emission under ultraviolet excitation, due to the formation of trivalent cerium ions with corresponding oxygen vacancies. This paper introduces the enhancement of both fluorescence emission and lifetime through adding gold nanoparticles. The reason is due to possible coupling between the plasmonic resonance of gold nanoparticles and the fluorescence emission of ceria that has been achieved, along with enhanced formation of trivalent cerium ions. Both factors lead to higher fluorescence intensity peaks and shorter fluoresce...
Source: Sensors - August 27, 2018 Category: Biotechnology Authors: Nader Shehata Effat Samir Ishac Kandas Tags: Article Source Type: research

Sensors, Vol. 19, Pages 1205: Ligand-Linked Nanoparticles-Based Hydrogen Gas Sensor with Excellent Homogeneous Temperature Field and a Comparative Stability Evaluation of Different Ligand-Linked Catalysts
alter Lang This paper presents a thermoelectric gas microsensor with improved stability where platinum nanoparticles linked by bifunctional ligands are used as a catalyst. The sensor design provides a homogeneous temperature field over the membrane, an important factor for the long-term stability of the catalyst. A comprehensive study of heat transfer from the chip is performed to evaluate the convection heat loss coefficient and to understand its effect on the homogeneity of the temperature field in a real-time situation. The effect of highly heat-conductive thermopiles is also analyzed by comparing the temperature di...
Source: Sensors - March 8, 2019 Category: Biotechnology Authors: Anmona Shabnam Pranti Daniel Loof Sebastian Kunz Volkmar Zielasek Marcus B äumer Walter Lang Tags: Article Source Type: research

Sensors, Vol. 19, Pages 5152: Synthesis of MBA-Encoded Silver/Silica Core-Shell Nanoparticles as Novel SERS Tags for Biosensing Gibberellin A3 Based on Au@Fe3O4 as Substrate
Zhihui Luo A surface-enhanced Raman scattering (SERS) tag is proposed for high-sensitivity detection of gibberellin A3 (GA3). Silver nanoparticles (AgNPs) were synthesized using citrate reduction. 4-Mercaptobenzoic acid (MBA) was used for the Raman-labeled molecules, which were coupled to the surface of the AgNPs using sulfydryls. MBA was coated with silica using the Stöber method to prevent leakage. GA3 antibodies were attached via the active functional groups N-Hydroxysuccinimide (NHS) and N-Ethyl-N’-(3-dimethylaminopropyl)carbodiimide hydrochloride (EDC) to construct a novel immuno-AgNP...
Source: Sensors - November 24, 2019 Category: Biotechnology Authors: Qingmin Wei Jianjuan Lin Fa Liu Changchun Wen Na Li Guobao Huang Zhihui Luo Tags: Article Source Type: research

Sensors, Vol. 20, Pages 2554: A Guideline for Effectively Synthesizing and Characterizing Magnetic Nanoparticles for Advancing Nanobiotechnology: A Review
ler The remarkable multimodal functionalities of magnetic nanoparticles, conferred by their size and morphology, are very important in resolving challenges slowing the progression of nanobiotechnology. The rapid and revolutionary expansion of magnetic nanoparticles in nanobiotechnology, especially in nanomedicine and therapeutics, demands an overview of the current state of the art for synthesizing and characterizing magnetic nanoparticles. In this review, we explain the synthesis routes for tailoring the size, morphology, composition, and magnetic properties of the magnetic nanoparticles. The pros and cons of the most...
Source: Sensors - April 29, 2020 Category: Biotechnology Authors: Mohammad Reza Zamani Kouhpanji Bethanie J. H. Stadler Tags: Review Source Type: research

Sensors, Vol. 20, Pages 3523: Highly Reproducible Surface-Enhanced Raman Scattering Detection of Alternariol Using Silver-Embedded Silica Nanoparticles
yun Jun Alternariol (AOH) is a mycotoxin from fungi that has been found in processed foods due to its high thermal stability. To address the complexity and costs of conventional AOH detection methods, we propose an alternative based on surface-enhanced Raman scattering (SERS) and specially designed nanoparticle substrate. Herein, silver-embedded silica (SiO2@Ag) nanoparticles with a highly reproducible SERS signal were successfully developed for detecting AOH. Silica nanoparticles (~145 nm) were used as a template to deposit silver nanoparticles (~17 nm), thereby generating SiO2@Ag. The SiO2@Ag nanoparticles showed a g...
Source: Sensors - June 21, 2020 Category: Biotechnology Authors: Eunil Hahm Yoon-Hee Kim Xuan-Hung Pham Bong-Hyun Jun Tags: Letter Source Type: research

Sensors, Vol. 21, Pages 2820: Experimental Characterization of Spurious Signals in Magnetic Nanoparticles Enhanced Microwave Imaging of Cancer
Scapaticci Magnetic nanoparticles enhanced microwave imaging relies on the capability of modulating the response of such nanocomponents at microwaves by means of a (low frequency) polarizing magnetic field. In medical imaging, this capability allows for the detection and imaging of tumors loaded with nanoparticles. As the useful signal is the one which arises from nanoparticles, it is crucial to remove sources of undesired disturbance to enable the diagnosis of early-stage tumors. In particular, spurious signals arise from instrumental drift, as well as from the unavoidable interaction between the polarizing field and...
Source: Sensors - April 16, 2021 Category: Biotechnology Authors: Ovidio M. Bucci Gennaro Bellizzi Sandra Costanzo Lorenzo Crocco Giuseppe Di Massa Rosa Scapaticci Tags: Article Source Type: research

Sensors, Vol. 21, Pages 5306: Nd3+-Doped TiO2 Nanoparticles as Nanothermometer: High Sensitivity in Temperature Evaluation inside Biological Windows
ittencourt TiO2 nanoparticles doped with different amounts of Nd3+ (0.5, 1, and 3 wt.%) were synthetized by the sol–gel method, and evaluated as potential temperature nanoprobes using the fluorescence intensity ratio between thermal-sensitive radiative transitions of the Nd3+. XRD characterization identified the anatase phase in all the doped samples. The morphology of the nanoparticles was observed with SEM, TEM and HRTEM microscopies. The relative amount of Nd3+ in TiO2 was obtained by EDXS, and the oxidation state of titanium and neodymium was investigated via XPS and NEXAFS, respectively. Nd3+ was present in all ...
Source: Sensors - August 6, 2021 Category: Biotechnology Authors: Selene Acosta Luis J. Borrero-Gonz ález Polona Umek Luiz A. O. Nunes Peter Guttmann Carla Bittencourt Tags: Article Source Type: research

Sensors, Vol. 22, Pages 2222: Simultaneous Electrochemical Sensing of Indole-3-Acetic Acid and Salicylic Acid on Poly(L-Proline) Nanoparticles & ndash;Carbon Dots & ndash;Multiwalled Carbon Nanotubes Composite-Modified Electrode
Sensors, Vol. 22, Pages 2222: Simultaneous Electrochemical Sensing of Indole-3-Acetic Acid and Salicylic Acid on Poly(L-Proline) Nanoparticles–Carbon Dots–Multiwalled Carbon Nanotubes Composite-Modified Electrode Sensors doi: 10.3390/s22062222 Authors: Mengxue Li Yiwen Kuang Ziyan Fan Xiaoli Qin Shiyu Hu Zhanning Liang Qilin Liu Weizhong Zhang Birui Wang Zhaohong Su Sensitive simultaneous electrochemical sensing of phytohormones indole-3-acetic acid and salicylic acid based on a novel poly(L-Proline) nanoparticles–carbon dots composite consisting of multiwalled ca...
Source: Sensors - March 13, 2022 Category: Biotechnology Authors: Mengxue Li Yiwen Kuang Ziyan Fan Xiaoli Qin Shiyu Hu Zhanning Liang Qilin Liu Weizhong Zhang Birui Wang Zhaohong Su Tags: Article Source Type: research