scholarly journals A Highly Sensitive Ammonia Gas Sensor Using Micrometer-Sized Core–Shell-Type Spherical Polyaniline Particles

Sensors ◽  
2021 ◽  
Vol 21 (22) ◽  
pp. 7522
Author(s):  
Masanobu Matsuguchi ◽  
Tomoki Nakamae ◽  
Ryoya Fujisada ◽  
Shunsuke Shiba
Keyword(s):  
Gas Sensor ◽  
High Sensitivity ◽  
Average Diameter ◽  
Chemical Oxidation ◽  
Spherical Particles ◽  
Core Shell ◽  
Polystyrene Microsphere ◽  
In Situ Chemical Oxidation ◽  
Highly Sensitive ◽  
Dispersion Solution

A highly sensitive NH3 gas sensor based on micrometer-sized polyaniline (PANI) spheres was successfully fabricated. The PANI microspheres were prepared via a facile in situ chemical oxidation polymerization in a polystyrene microsphere dispersion solution, resulting in a core–shell structure. The sensor response increased as the diameter of the microspheres increased. The PSt@PANI(4.5) sensor, which had microspheres with a 4.5 μm average diameter, showed the largest response value of 77 for 100 ppm dry NH3 gas at 30 °C, which was 20 times that of the PANI-deposited film-based sensor. Even considering measurement error, the calculated detection limit was 46 ppb. A possible reason for why high sensitivity was achieved is simply the use of micrometer-sized PANI spherical particles. This research succeeded in providing a new and simple technology for developing a high-sensitivity NH3 gas sensor that operates at room temperature.

scholarly journals Nanoporous fluorescent sensor based on upconversion nanoparticles for the detection of dichloromethane with high sensitivity

RSC Advances ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 565-571
Author(s):  
Haiyan Wang ◽  
Shiping Zhan ◽  
Xiaofeng Wu ◽  
Lingqiong Wu ◽  
Yunxin Liu
Keyword(s):  
Thin Film ◽  
Gas Sensor ◽  
Fluorescent Sensor ◽  
High Sensitivity ◽  
Anodic Alumina ◽  
Upconversion Nanoparticles ◽  
Core Shell ◽  
Highly Sensitive ◽  
Anodic Alumina Oxide ◽  
Alumina Oxide

We report a highly sensitive nanoporous fluorescence sensor based on core/shell upconversion nanoparticles (UCNPs) for the detection of dichloromethane. UCNPs are deposited on porous anodic alumina oxide templates to form a thin film-like gas sensor.

Hollow NiFe2O4 microspindles derived from Ni/Fe bimetallic MOFs for highly sensitive acetone sensing at low operating temperatures

2018 ◽  
Vol 5 (5) ◽  
pp. 1107-1114 ◽  
Author(s):  
Xue-Zhi Song ◽  
Fei-Fei Sun ◽  
Shu-Ting Dai ◽  
Xin Lin ◽  
Kai-Ming Sun ◽  
...  
Keyword(s):  
Gas Sensor ◽  
High Sensitivity ◽  
Cycling Stability ◽  
Acetone Vapor ◽  
Working Temperature ◽  
Highly Sensitive ◽  
Operating Temperatures

A gas sensor based on hollow NiFe2O4 microspindles delivers unprecedentedly high sensitivity towards acetone vapor as well as good selectivity and cycling stability at a low working temperature.

scholarly journals Highly sensitive two-dimensional MoS 2 gas sensor decorated with Pt nanoparticles

2018 ◽  
Vol 5 (12) ◽  
pp. 181462 ◽  
Author(s):  
Jaeseo Park ◽  
Jihun Mun ◽  
Jae-Soo Shin ◽  
Sang-Woo Kang
Keyword(s):  
Gas Sensor ◽  
Vapour Deposition ◽  
Limit Of Detection ◽  
Pt Nanoparticles ◽  
High Sensitivity ◽  
Two Dimensional ◽  
Stencil Mask ◽  
Highly Sensitive ◽  
Metal Organic ◽  
Metal Decoration

A two-dimensional molybdenum disulfide (MoS 2 )-based gas sensor was decorated with Pt nanoparticles (NPs) for high sensitivity and low limit of detection (LOD) for specific gases (NH 3 and H 2 S). The two-dimensional MoS 2 film was grown at 400°C using metal organic gas vapour deposition. To fabricate the MoS 2 gas sensor, an interdigitated Au/Ti electrode was deposited using the electron beam (e-beam) evaporation method with a stencil mask. The MoS 2 gas sensor without metal decoration sensitively detects NH 3 and H 2 S gas down to 2.5 and 30 ppm, respectively, at room temperature (RT). However, for improved detection of NH 3 and H 2 S gas, we investigated the functionalization strategy using metal decoration. Pt NP decoration modulated the electronic properties of MoS 2 , significantly improving the sensitivity of NH 3 and H 2 S gas by 5.58× and 4.25×, respectively, compared with the undecorated MoS 2 gas sensor under concentrations of 70 ppm. Furthermore, the Pt NP-decorated MoS 2 sensor had lower LODs for NH 3 and H 2 S gas of 130 ppb and 5 ppm, respectively, at RT.

Synthesized of Highly Sensitive Tin (IV)-Doped Zinc Oxide Humidity Sensor

2015 ◽  
Vol 1109 ◽  
pp. 559-563
Author(s):  
Ahmad Syakirin Ismail ◽  
Mohd Firdaus Malek ◽  
Muhammad Amir Ridhwan Abdullah ◽  
Mohamad Hafiz Mamat ◽  
M. Rusop
Keyword(s):  
Zinc Oxide ◽  
Recovery Time ◽  
Humidity Sensor ◽  
Sol Gel ◽  
High Sensitivity ◽  
Average Diameter ◽  
Undoped Sample ◽  
Immersion Method ◽  
Response Recovery ◽  
Highly Sensitive

High sensitivity Tin (IV) (Sn) - doped zinc oxide (ZnO) humidity sensor was deposited using sol-gel immersion method. The Sn-doped sample was deposited on glass substrate and undoped sample was also prepared to seem the improvement made through doping process. The analyses showed that the sensor’s morphology has become more porous and having lower average diameter of nanorods, high conductivity and higher response, recovery time, and sensitivity. The sensitivity of the sensor increased from 2 to 4 by doping with Sn.

Controllable construction of core–shell CuCo2S4@polypyrrole nanocomposites as advanced anode materials for high-performance sodium ion half/full batteries

2021 ◽  
Vol 5 (1) ◽  
pp. 293-303
Author(s):  
Qun Li ◽  
Qingze Jiao ◽  
Wei Zhou ◽  
Xueting Feng ◽  
Quan Shi ◽  
...  
Keyword(s):  
Anode Materials ◽  
High Performance ◽  
Rate Capability ◽  
Chemical Oxidation ◽  
Sodium Ion ◽  
Core Shell ◽  
Sodium Ion Batteries ◽  
In Situ Chemical Oxidation ◽  
Chemical Oxidation Polymerization

Core–shell CuCo2S4@polypyrrole (CS-CuCo2S4@PPy) nanocomposites, as advanced anode materials for sodium ion batteries with outstanding cycling stability and rate capability, were prepared by a facile solvothermal strategy and subsequent in-situ chemical oxidation polymerization.

scholarly journals Constructing a TiO2/PDA core/shell nanorod array electrode as a highly sensitive and stable photoelectrochemical glucose biosensor

RSC Advances ◽  
2020 ◽  
Vol 10 (17) ◽  
pp. 10017-10022 ◽  
Author(s):  
Wei Xu ◽  
Wenke Yang ◽  
Hongkai Guo ◽  
Lianyuan Ge ◽  
Jinchun Tu ◽  
...  
Keyword(s):  
Detection Limit ◽  
High Sensitivity ◽  
Nanorod Array ◽  
Glucose Biosensor ◽  
Core Shell ◽  
Glucose Biosensors ◽  
Low Detection Limit ◽  
Array Electrode ◽  
Highly Sensitive

Developing stable PEC glucose biosensors with high sensitivity and low detection limit is highly desirable in the biosensor field.

Application of Au Nanoparticles–AgCl@Polypyrrole Hybrid Material to Amperometric Biosensor

2010 ◽  
Vol 92 ◽  
pp. 23-28 ◽  
Author(s):  
Xiang Zhong Ren ◽  
Li Zhang ◽  
Ying Kai Jiang ◽  
Pei Xin Zhang ◽  
Jian Hong Liu ◽  
...  
Keyword(s):  
Hybrid Material ◽  
Sodium Citrate ◽  
Au Nanoparticles ◽  
Chemical Oxidation ◽  
Glucose Biosensor ◽  
In Situ Chemical Oxidation ◽  
Highly Sensitive ◽  
Chemical Oxidation Polymerization ◽  
Infrared Spectrometer

AgCl@polypyrrole(PPy) nanocomposites were synthesized through in situ chemical oxidation polymerization by using poly(vinylpyrrolidane) (PVP) as dispersant, and some Au colloid were prepared by using KBH4 as reductant and sodium citrate as stabilizer, then the Au nanoparticles-AgCl@PPy hybrid material was formed by physical chemical reaction. Fourier transform infrared spectrometer (FTIR) and electron dispersive spectrometer (EDS) data suggested that the hybrid material were composed of Au, AgCl and PPy. An amperometric glucose biosensor was fabricated by adsorbing glucose oxidase (GOx) to an Au nanoparticles-AgCl@PPy hybrid material modified platinum electrode. The biosensor exhibited a super highly sensitive response to H2O2.

A highly sensitive room temperature H2S gas sensor based on SnO2 multi-tube arrays bio-templated from insect bristles

2015 ◽  
Vol 44 (17) ◽  
pp. 7911-7916 ◽  
Author(s):  
Junlong Tian ◽  
Feng Pan ◽  
Ruiyang Xue ◽  
Wang Zhang ◽  
Xiaotian Fang ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Tin Oxide ◽  
Room Temperature ◽  
High Sensitivity ◽  
Highly Sensitive ◽  
Tube Arrays ◽  
H2s Gas Sensor ◽  
Parallel Effect

A tin oxide multi-tube array with a parallel effect was fabricated, which exhibited high sensitivity to H2S gas at room temperature.

Fabrication of a one-dimensional tube-in-tube polypyrrole/tin oxide structure for highly sensitive DMMP sensor applications

2017 ◽  
Vol 5 (33) ◽  
pp. 17335-17340 ◽  
Author(s):  
Jaemoon Jun ◽  
Jun Seop Lee ◽  
Dong Hoon Shin ◽  
Jungkyun Oh ◽  
Wooyoung Kim ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Tin Oxide ◽  
Vapor Deposition ◽  
High Sensitivity ◽  
Oxide Structure ◽  
One Dimensional ◽  
Sensor Applications ◽  
Highly Sensitive ◽  
Sensitivity And Selectivity

1D tube-in-tube polypyrrole/tin oxide structure was fabricated using electrospinning and vapor deposition polymerization to construct the DMMP gas sensor, which shows high sensitivity and selectivity.

V2O5 Nanotubes Novel Gas Sensor with High Sensitivity for Ethanol

2009 ◽  
Vol 421-422 ◽  
pp. 328-331 ◽  
Author(s):  
Wei Jin ◽  
Wen Chen ◽  
Bai Tao Dong ◽  
Chun Xia Zhao ◽  
Li Qiang Mai ◽  
...  
Keyword(s):  
Vanadium Oxide ◽  
Gas Sensor ◽  
Gas Sensors ◽  
Gas Sensing ◽  
Hydrothermal Reaction ◽  
High Sensitivity ◽  
Average Diameter ◽  
Self Assembling ◽  
Gas Sensing Properties ◽  
Vanadium Oxide Nanotubes

Vanadium oxide nanotubes were synthesized via a rheological self-assembling process followed by a hydrothermal reaction. V2O5 gas sensors were fabricated from vanadium oxide nanotubess with an average diameter of around 90 nm and their gas-sensing properties were investigated. It was found that the sensors based on vanadium oxide nanotubes exhibit high responses ethanol gas at 270°C. The results indicate that vanadium oxide nanotube sensors will be promising candidates for practical detectors for ethanol.

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