scholarly journals Pure SnO<sub>2</sub> Gas Sensor with High Sensitivity and Selectivity towards C<sub>2</sub>H<sub>5</sub>OH

2021 ◽  
Vol 10 (02) ◽  
pp. 66-74
Author(s):  
Abeer Alhadi ◽  
Shuyi Ma ◽  
Tingting Yang ◽  
Shitu Pei ◽  
Pengdou Yun ◽  
...  
Keyword(s):  
Gas Sensor ◽  
High Sensitivity ◽  
Sensitivity And Selectivity

Mo doped BiVO4 gas sensor with high sensitivity and selectivity towards H2S

2020 ◽  
Vol 395 ◽  
pp. 125144 ◽  
Author(s):  
Xiaokang Qiao ◽  
Youxun Xu ◽  
Kai Yang ◽  
Jingzhou Ma ◽  
Can Li ◽  
...  
Keyword(s):  
Gas Sensor ◽  
High Sensitivity ◽  
Sensitivity And Selectivity

scholarly journals An Effective Optical Dual Gas Sensor for Simultaneous Detection of Oxygen and Ammonia

Sensors ◽  
2019 ◽  
Vol 19 (23) ◽  
pp. 5124 ◽  
Author(s):  
Sajal Biring ◽  
Annada Sankar Sadhu ◽  
Moumita Deb
Keyword(s):  
Gas Sensor ◽  
Fluorescent Dyes ◽  
Low Cost ◽  
Simultaneous Detection ◽  
High Sensitivity ◽  
Eosin Y ◽  
Practical Applications ◽  
Sensing Material ◽  
Dual Sensor ◽  
Sensitivity And Selectivity

The development of a simple, low-cost sensor for the effective sensing of multiple gases in industrial or residential zones has been in high demand in recent days. In this article, we have proposed an optical sensor for the dual sensing of oxygen (O2) and ammonia (NH3) gases, which consists of oxygen and ammonia-sensitive fluorescent dyes coated individually on both sides of a glass substrate. An ethyl cellulose (EC) matrix doped with platinum (II) meso-tetrakis (pentafluorophenyl) porphyrin (PtTFPP) serves as the oxygen-sensing material, whereas the NH3-sensing material includes an eosin Y fluorescent indicator immobilized within a cellulose acetate (CA) matrix. Both the oxygen and ammonia-sensitive materials were excited by the same LED light source with a 405 nm peak wavelength, while the corresponding emissions were detected separately for the selective sensing of the gases under study. The dual gas sensor exhibits maximum sensitivities of around 60 and 20 for oxygen and ammonia gases, respectively. The high sensitivity and selectivity of the proposed optical dual sensor suggests the feasibility of the simultaneous sensing of oxygen and ammonia for practical applications.

Hierarchical SnO2–Sn3O4 heterostructural gas sensor with high sensitivity and selectivity to NO2

2019 ◽  
Vol 301 ◽  
pp. 127010 ◽  
Author(s):  
Wenwen Zeng ◽  
Yingzhi Liu ◽  
Jun Mei ◽  
Changyu Tang ◽  
Kun Luo ◽  
...  
Keyword(s):  
Gas Sensor ◽  
High Sensitivity ◽  
Sensitivity And Selectivity

Preparation and Gas Sensing Properties of Microrod ZnO Materials

2014 ◽  
Vol 492 ◽  
pp. 297-300
Author(s):  
Liu Fang Yang ◽  
Yu Lin Wang ◽  
Qin Hui Wang
Keyword(s):  
Gas Sensor ◽  
Gas Sensing ◽  
Operating Temperature ◽  
High Sensitivity ◽  
Raw Material ◽  
Gas Sensing Properties ◽  
Sensitivity And Selectivity ◽  
Static Volumetric Method ◽  
Degree Of Crystallization ◽  
High Degree

Using zinc chloride solution and ammonia (25%) as raw material, with the presence of surfactant (CTAB), the microrod ZnO material was synthesized by the hydrothermal method. The phase composition and microstructure of the prepared ZnO material were characterized with XRD and SEM. The results show that the ZnO material possesses a high degree of crystallization, its diameter below 4 μm, and its length about 35 μm. The gas sensing property of gas sensor fabricated with the prepared ZnO material was evaluated via the static volumetric method. At the operating temperature of 200°C, the gas sensor has high sensitivity and selectivity to CH3COCH3.The gas sensing characterization was also discussed.

scholarly journals Size-controlled synthesis of porous ZnSnO3 nanocubes for improving formaldehyde gas sensitivity

RSC Advances ◽  
2021 ◽  
Vol 11 (33) ◽  
pp. 20268-20277
Author(s):  
Jiaoling Zheng ◽  
Huanhuan Hou ◽  
Hao Fu ◽  
Liping Gao ◽  
Hongjie Liu
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Gas Sensor ◽  
Specific Surface Area ◽  
High Sensitivity ◽  
Controlled Synthesis ◽  
Gas Sensitivity ◽  
Sensitivity And Selectivity ◽  
Size Controlled

The size of the ZnSnO3 nanocubes is about 100 nm with the corresponding specific surface area of 70.001 m2 g−1. A gas sensor based on porous ZnSnO3 nanocubes shows high sensitivity and selectivity to formaldehyde.

scholarly journals Interaction of Several Toxic Heterocarbonyl Gases with Polypyrrole as a Potential Gas Sensor

Chemosensors ◽  
2020 ◽  
Vol 8 (3) ◽  
pp. 84
Author(s):  
Francisco C. Franco
Keyword(s):  
Gas Sensor ◽  
Density Functional ◽  
Energy Gap ◽  
Carbonyl Sulfide ◽  
High Sensitivity ◽  
Basis Sets ◽  
Dft Methods ◽  
Functional Methods ◽  
Sensitivity And Selectivity ◽  
High Level

The interactions of the toxic heterocarbonyl gases phosgene, carbonyl fluoride, formaldehyde, carbonyl sulfide, and acetone with polypyrrole as a toxic heterocarbonyl gas sensor, were extensively studied by density functional theory (DFT). The Becke 3-parameter, Lee-Yang-Parr (B3LYP) exchange-correlation functional methods were first tested against several high-level DFT methods employing the Dunning’s double-ζ and triple-ζ basis sets and were found to be sufficient in describing the non-covalent interactions involved in this study. The interaction of pyrrole with the heterocarbonyl gases resulted in changes in the structure and optoelectronic properties of the polymer and it was observed that acetone and formaldehyde had the strongest H-bonding interaction with polypyrrole, while the interaction of phosgene and formaldehyde resulted in the lowest energy gap and may result in its high sensitivity towards these gases. The UV-Vis absorption revealed significant red-shifted first singlet excited states (Eexcited, 1st) of the complexes and follows the same trend as the EGap values. It is shown that the Eexcited, 1st was due to the π(HOMOPy) ⟶ π*(LUMOHC) transitions and the excited state at maximum absorption (Eexcited, max) was due to the π(HOMOPy) ⟶ π*(LUMOPy) transitions. This study demonstrates the potential sensitivity and selectivity of polypyrrole as a toxic heterocarbonyl sensor.

A dimethyl methylphonate sensor based on HFIPPH modified SWCNTs

2022 ◽  
Author(s):  
Haiyang Wu ◽  
Yubin Yuan ◽  
Qiang Wu ◽  
Xiangrui Bu ◽  
Long Hu ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Self Assembly ◽  
High Performance ◽  
Gas Sensing ◽  
Detection System ◽  
High Sensitivity ◽  
Assembly Method ◽  
Sensitivity And Selectivity ◽  
Effect Transistor ◽  
Walled Carbon Nanotubes

Abstract In order to meet the requirements of ultra-fast real-time monitoring of sarin simulator with high sensitivity and selectivity, it is of great significance to develop high performance dimethyl methylphonate (DMMP) sensor. Herein, we proposed a DMMP sensor based on p-hexafluoroisopropanol phenyl (HFIPPH) modified self-assembled single-walled carbon nanotubes (SWCNTs) with field effect transistor (FET) structure. The self-assembly method provides a 4 nanometres thick and micron sized SWCNT channel, with high selectivity to DMMP. The proposed SWCNTs-HFIPPH based sensor exhibits remarkably higher response to DMMP than bare SWCNT based gas sensor within only few seconds. The gas sensing response of SWCNTs-HFIPPH based sensor for 1ppm DMMP is 18.2%, and the response time is about 10 seconds. What's more, the gas sensor we proposed here shows excellent selectivity and reproducibility, and the limitation of detection is as low as ppb level. The proposed method lays the foundation for miniaturization and integration of DMMP sensors, expecting to develop detection system for practical sarin sensing application.

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.

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