The role of oxygen adsorption and gas sensing mechanism for cerium vanadate (CeVO4) nanorods

RSC Advances ◽  
2016 ◽  
Vol 6 (18) ◽  
pp. 14552-14558 ◽  
Author(s):  
Jimin Hou ◽  
Huihan Huang ◽  
Zhizhong Han ◽  
Haibo Pan
Keyword(s):  
Gas Sensor ◽  
Gas Sensing ◽  
Oxygen Adsorption ◽  
Sensing Mechanism ◽  
Highly Active ◽  
Cerium Vanadate

Square-section CeVO4 nanorods with highly active and exposed (010) facets have been shown to be highly promising as an acetone gas sensor.

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.

Role of Electric Field on Sensing Mechanism of Carbon Nanotube Based Ammonia Gas Sensor

2013 ◽  
Vol 11 (8) ◽  
pp. 1460-1464 ◽  
Author(s):  
Prabhash Mishra ◽  
Prerna Balyan ◽  
. Harsh ◽  
S. S. Islam
Keyword(s):  
Carbon Nanotube ◽  
Electric Field ◽  
Gas Sensor ◽  
Ammonia Gas ◽  
Sensing Mechanism

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.

A novel low-concentration isopropanol gas sensor based on Fe-doped ZnO nanoneedles and its gas sensing mechanism

2020 ◽  
Vol 56 (4) ◽  
pp. 3230-3245
Author(s):  
Yifan Luo ◽  
Ahmadou Ly ◽  
Driss Lahem ◽  
Chao Zhang ◽  
Marc Debliquy
Keyword(s):  
Gas Sensor ◽  
Gas Sensing ◽  
Low Concentration ◽  
Sensing Mechanism ◽  
Doped Zno

THERMAL DIFFUSIVITY STUDIES OF ZnO-CuO AT HIGH TEMPERATURES

2015 ◽  
Vol 76 (3) ◽  
Author(s):  
Rabiatuladawiyah Md Akhir ◽  
Zaidan Abd Wahab
Keyword(s):  
Zinc Oxide ◽  
Thermal Diffusivity ◽  
Gas Sensor ◽  
Gas Sensing ◽  
Laser Flash ◽  
Ceramic Composites ◽  
Solid State Method ◽  
Laser Flash Technique ◽  
Composite Samples

An n-type semiconducting oxide such as Zinc Oxide (ZnO) has been exploited for their well-known gas sensing properties. Previous studies on these applications have mainly focused on electrical properties. Only limited reports were available on thermophysical properties of ZnO-based ceramics gas sensor. Therefore in this work, we report on the thermal diffusivity of Zinc Oxide-Copper Oxide (ZnO-CuO) ceramic composites by solid-state method using a laser flash technique. Thermal diffusivity of samples was measured at temperatures between 27 °C to 400 °C. The role of CuO was observed to enhance the thermal diffusivity of ZnO system with respect to the temperatures. ZnO-CuO samples played a significant role in improvement of thermal diffusivity value at temperature of 200 °C and above. Subsequently, sample of higher thermal diffusivity will exhibit lower initialization time for gas sensor to activate. Hence, the enhanced thermal diffusivity suggested that ZnO-CuO composite samples hold a promising possibility in gas sensor application. 

Design of highly sensitive and selective Au@NiO yolk–shell nanoreactors for gas sensor applications

Nanoscale ◽  
2014 ◽  
Vol 6 (14) ◽  
pp. 8292-8299 ◽  
Author(s):  
Prabhakar Rai ◽  
Ji-Wook Yoon ◽  
Hyun-Mook Jeong ◽  
Su-Jin Hwang ◽  
Chang-Hoon Kwak ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Gas Sensing ◽  
Sensing Mechanism ◽  
Sensor Applications ◽  
Highly Sensitive

Highly selective and sensitive H2S sensor was designed using Au@NiO yolk–shell nanoreactors, and its gas sensing mechanism was suggested.

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.

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