Gas-sensing and electrical properties of perovskite structure p-type barium-substituted bismuth ferrite

RSC Advances ◽  
2015 ◽  
Vol 5 (38) ◽  
pp. 29618-29623 ◽  
Author(s):  
Guangzhi Dong ◽  
Huiqing Fan ◽  
Hailin Tian ◽  
Jiawen Fang ◽  
Qiang Li
Keyword(s):  
Electrical Properties ◽  
Equivalent Circuit ◽  
Gas Sensor ◽  
Perovskite Structure ◽  
Gas Sensing ◽  
Bismuth Ferrite ◽  
Schematic Diagram ◽  
Sensing Mechanism ◽  
Reducing Gas ◽  
P Type

Schematic diagram of the proposed gas-sensing mechanism for the p-type BiFeO3 based gas sensor: (a) and (c) in air, (b) and (d) in reducing gas, (e) simplified equivalent circuit.

scholarly journals Room-Temperature H2 Gas Sensing Characterization of Graphene-Doped Porous Silicon via a Facile Solution Dropping Method

2017 ◽  
Author(s):  
Nu Si A Eom ◽  
Hong-Baek Cho ◽  
Yoseb Song ◽  
Woojin Lee ◽  
Tohru Sekino ◽  
...  
Keyword(s):  
Porous Silicon ◽  
Gas Sensor ◽  
Room Temperature ◽  
Gas Sensing ◽  
Electrochemical Etching ◽  
Sensor Material ◽  
Sensing Mechanism ◽  
Si Substrates ◽  
H2 Sensor ◽  
P Type

In this study, a graphene-doped porous silicon (G-doped/p-Si) substrate for low ppm H2 gas detection by an inexpensive synthesis route was proposed as a potential noble graphene-based gas sensor material and to understand the sensing mechanism. The G-doped/p-Si gas sensor was synthesized by a simple capillary force-assisted solution dropping method on p-Si substrates, whose porosity was generated through an electrochemical etching process. G-doped/p-Si was fabricated with various graphene concentrations and exploited as a H2 sensor operated at room temperature. The sensing mechanism of the sensor with/without graphene decoration on p-Si was proposed to elucidate the synergetic gas sensing effect generated from the interface between the graphene and p-type silicon.

Perovskite-structured LaCoO3 modified ZnO gas sensor and investigation on its gas sensing mechanism by first principle

2021 ◽  
Vol 341 ◽  
pp. 130015
Author(s):  
Wenbo Qin ◽  
Zhenyu Yuan ◽  
Hongliang Gao ◽  
Renze Zhang ◽  
Fanli Meng
Keyword(s):  
Gas Sensor ◽  
Gas Sensing ◽  
First Principle ◽  
Sensing Mechanism

UV-enhanced NO2 sensor using ZnO quantum dots sensitized SnO2 porous nanowires

2022 ◽  
Author(s):  
Tianchen Jiang ◽  
xin liu ◽  
jianbo sun
Keyword(s):  
Quantum Dots ◽  
Gas Sensor ◽  
Uv Irradiation ◽  
Gas Sensing ◽  
Complex Impedance ◽  
Sensing Properties ◽  
Sensing Mechanism ◽  
No2 Sensor ◽  
Zno Quantum Dots ◽  
Uv Excitation

Abstract ZnO quantum dots sensitized SnO2 porous nanowires were fabricated and designed for UV excitation gas sensor. The ZnO/SnO2 composite (SZQ1%) with the molar proportion of 1:100 exhibits excellent sensing properties to NO2 gas under UV irradiation at 40oC. The humidity stability of SZQ1% was also measured and discussed by DC reversed circuit and complex impedance curves. The gas sensing mechanism is well discussed and illustrated to the ZnO quantum dots sensitized and the increased photo-generated carriers under UV irradiation.

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.

Modeling of a p-type resistive gas sensor in the presence of a reducing gas

2013 ◽  
Vol 181 ◽  
pp. 340-347 ◽  
Author(s):  
A. Bejaoui ◽  
J. Guerin ◽  
K. Aguir
Keyword(s):  
Gas Sensor ◽  
Reducing Gas ◽  
P Type

Fabrication of a propanol gas sensor using p-type nickel oxide nanostructures: The effect of ramping rate towards luminescence and gas sensing characteristics

2020 ◽  
Vol 253 ◽  
pp. 123316 ◽  
Author(s):  
Teboho P. Mokoena ◽  
Kenneth T. Hillie ◽  
Hendrik C. Swart ◽  
Nompumelelo Leshabane ◽  
James Tshilongo ◽  
...  
Keyword(s):  
Nickel Oxide ◽  
Gas Sensor ◽  
Gas Sensing ◽  
Oxide Nanostructures ◽  
P Type ◽  
Sensing Characteristics ◽  
Type Nickel

Study on Fabrication and Properties of Copper-Tin-Oxide Thin Films

2009 ◽  
Vol 79-82 ◽  
pp. 787-790
Author(s):  
Ti Ning ◽  
Feng Ji ◽  
Jin Ma ◽  
Zhen Guo Song ◽  
Xu An Pei ◽  
...  
Keyword(s):  
Thin Films ◽  
Electrical Properties ◽  
Magnetron Sputtering ◽  
Tin Oxide ◽  
Perovskite Structure ◽  
Annealing Temperature ◽  
Optical And Electrical Properties ◽  
Oxide Thin Films ◽  
Thermal Probe ◽  
P Type

Copper-tin-oxide thin films have been prepared on quartz substrates by the magnetron sputtering method. The structural,optical and electrical properties were investigated. The prepared samples were amorphous, CuSnO3 single crystalline grains with perovskite structure were observed after annealing temperature was above 530°C. The optical and electrical properties had great dependence with reactive gas pressure and annealing temperature. Thermal probe reveals p type conductivity of some samples. Keywords: Magnetron sputtering, CuSnO3, Perovskite structure

Highly sensitive and selective CO gas sensor based on a hydrophobic SnO2/CuO bilayer

RSC Advances ◽  
2016 ◽  
Vol 6 (52) ◽  
pp. 47178-47184 ◽  
Author(s):  
Arvind Kumar ◽  
Amit Sanger ◽  
Ashwani Kumar ◽  
Ramesh Chandra
Keyword(s):  
Gas Sensor ◽  
Gas Sensing ◽  
Sensing Mechanism ◽  
Highly Sensitive ◽  
Co Gas Sensor ◽  
Co Gas

CO gas sensing mechanism of SnO2/CuO bilayer sensor.

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