A high-sensitivity H2S gas sensor based on optimized ZnO-ZnS nano-heterojunction sensing material

2020 ◽  
Vol 31 (8) ◽  
pp. 2050-2054 ◽  
Author(s):  
Pei Ding ◽  
Dongsheng Xu ◽  
Nan Dong ◽  
Ying Chen ◽  
Pengcheng Xu ◽  
...  
Keyword(s):  
Gas Sensor ◽  
High Sensitivity ◽  
Sensing Material ◽  
H2s Gas Sensor

H2S gas sensor based on integrated resonant dual-microcantilevers with high sensitivity and identification capability

2020 ◽  
Vol 31 (8) ◽  
pp. 2155-2158
Author(s):  
Lei Tang ◽  
Pengcheng Xu ◽  
Ming Li ◽  
Haitao Yu ◽  
Xinxin Li
Keyword(s):  
Gas Sensor ◽  
High Sensitivity ◽  
H2s Gas Sensor

Structure and Characteristics of Electrospun ZnO Nanofibers for Gas Sensing

2020 ◽  
Vol 16 (2) ◽  
pp. 187-195
Author(s):  
Tang-Yu Lai ◽  
Te-Hua Fang ◽  
Yu-Jen Hsiao ◽  
En-Yu Kuo
Keyword(s):  
Gas Sensor ◽  
Photoelectron Spectroscopy ◽  
Gas Sensing ◽  
High Sensitivity ◽  
Oxide Semiconductor ◽  
Woven Fabric ◽  
Membrane Thickness ◽  
One Dimensional ◽  
Sensing Mechanism ◽  
Sensing Material

Background:: A sensing material of zinc oxide (ZnO) was investigated for its use in the electrospun nanofibers for gas sensing. The metal oxide semiconductor gas sensor response is caused by the oxygen that undergoes a chemical reaction on the surface of an oxide, resulting in a change in the measured resistance. Objective:: One-dimensional nanofibers gas sensor have high sensitivity and diverse selectivity. Methods:: One-dimensional nanofiber by an electrospinning method was collected and a sensing membrane was formed. In addition, the gas sensing mechanism was discussed and verified by X-ray photoelectron spectroscopy (XPS). Results:: The ZnO nanofiber membrane had an optimum crystalline phase with a lattice spacing of 0.245 nm and a non-woven fabric structure at a calcination temperature of 500°C, whereas the nanofiber diameter and membrane thickness were about 100 nm and 8 μm, respectively. At an operating temperature of 200°C, the sensing material exhibited good recovery and reproducibility in response to Carbon monoxide (CO), and the concentration was also highly discernible. In addition, the reduction in the peak of OIII at 531.5 to 532.5 eV according to the analysis of XPS was consistent with the description of the sensing mechanism. Conclusion:: The gas sensor of ZnO nanofiber membranes has high sensitivity and diverse selectivity, which can be widely applied in potential applications in various sensors and devices.

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.

High-sensitivity CO electrochemical gas sensor based on a superconductive C-loaded CuO-CeO2 nanocomposite sensing material

2021 ◽  
Vol 271 ◽  
pp. 115272
Author(s):  
Xiaolong Li ◽  
Zhejian Li ◽  
Yuping Chen ◽  
Kunfeng Zhao ◽  
Yubo Jiang ◽  
...  
Keyword(s):  
Gas Sensor ◽  
High Sensitivity ◽  
Sensing Material

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.

scholarly journals Semiconductor Metal Oxide Nanoparticles: A Review for the Potential of H2S Gas Sensor Application

2020 ◽  
pp. 199-208
Author(s):  
Zaid Hameed Mahmoud ◽  
Omar Dhaa Abdalstar ◽  
Noor Sabah
Keyword(s):  
Metal Oxide ◽  
Gas Sensor ◽  
Gas Sensors ◽  
Low Cost ◽  
Metal Oxide Nanoparticles ◽  
High Sensitivity ◽  
Modern World ◽  
H2s Gas Sensor ◽  
Work Mechanism ◽  
Semiconductor Metal Oxide

In modern world, gas sensors play important role in many fields of technology used for air pollution, breath analysis, public safety and many others. Gas sensor based semiconductor metal oxide is mostly used in these applications because of low cost, ease-to-use, high sensitivity and lower power consumption. This paper gives an overview about the semiconductor metal oxide and reviews why using it as sensing of gases in electrical applications and then it addresses to the work mechanism of a sensor to sensing H2S gas.

scholarly journals The Adsorption and Sensing Performances of Ir-modified MoS2 Monolayer toward SF6 Decomposition Products: A DFT Study

Nanomaterials ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 100
Author(s):  
Hongcheng Liu ◽  
Feipeng Wang ◽  
Kelin Hu ◽  
Tao Li ◽  
Yuyang Yan ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Density Functional ◽  
Gas Adsorption ◽  
Dft Method ◽  
Orbital Theory ◽  
Gas Sensitivity ◽  
Decomposition Products ◽  
Mos2 Monolayer ◽  
Characteristic Decomposition ◽  
Sensing Material

In this paper, the Ir-modified MoS2 monolayer is suggested as a novel gas sensor alternative for detecting the characteristic decomposition products of SF6, including H2S, SO2, and SOF2. The corresponding adsorption properties and sensing behaviors were systematically studied using the density functional theory (DFT) method. The theoretical calculation indicates that Ir modification can enhance the surface activity and improve the conductivity of the intrinsic MoS2. The physical structure formation, the density of states (DOS), deformation charge density (DCD), molecular orbital theory analysis, and work function (WF) were used to reveal the gas adsorption and sensing mechanism. These analyses demonstrated that the Ir-modified MoS2 monolayer used as sensing material displays high sensitivity to the target gases, especially for H2S gas. The gas sensitivity order and the recovery time of the sensing material to decomposition products were reasonably predicted. This contribution indicates the theoretical possibility of developing Ir-modified MoS2 as a gas sensor to detect characteristic decomposition gases of SF6.

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