scholarly journals CuxO Nanostructure-Based Gas Sensors for H2S Detection: An Overview

Chemosensors ◽  
2021 ◽  
Vol 9 (6) ◽  
pp. 127
Author(s):  
Sachin Navale ◽  
Mehrdad Shahbaz ◽  
Sanjit Manohar Majhi ◽  
Ali Mirzaei ◽  
Hyoun-Woo Kim ◽  
...  
Keyword(s):  
Metal Oxides ◽  
Gas Sensors ◽  
Noble Metals ◽  
Oil And Gas ◽  
Detection Mechanism ◽  
Reliable Detection ◽  
Electrical Sensing ◽  
Semiconducting Metal Oxides ◽  
H2s Detection

H2S gas is a toxic and hazardous byproduct of the oil and gas industries. It paralyzes the olfactory nerves, with concentrations above 100 ppm, resulting in loss of smell; prolonged inhalation may even cause death. One of the most important semiconducting metal oxides for the detection of H2S is CuxO (x = 1, 2), which is converted to CuxS upon exposure to H2S, leading to a remarkable modulation in the resistance and appearance of an electrical sensing signal. In this review, various morphologies of CuxO in the pristine form, composites of CuxO with other materials, and decoration/doping of noble metals on CuxO nanostructures for the reliable detection of H2S gas are thoroughly discussed. With an emphasis to the detection mechanism of CuxO-based gas sensors, this review presents findings that are of considerable value as a reference.

scholarly journals Effect of Ag Addition on the Gas-Sensing Properties of Nanostructured Resistive-Based Gas Sensors: An Overview

Sensors ◽  
2021 ◽  
Vol 21 (19) ◽  
pp. 6454
Author(s):  
Sachin Navale ◽  
Mehrdad Shahbaz ◽  
Ali Mirzaei ◽  
Sang Sub Kim ◽  
Hyoun Woo Kim
Keyword(s):  
Gas Sensors ◽  
Noble Metals ◽  
Gas Sensing ◽  
Response Times ◽  
Detection Mechanism ◽  
Ag Addition ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
Semiconducting Metal Oxides ◽  
The Impact

Nanostructured semiconducting metal oxides (SMOs) are among the most popular sensing materials for integration into resistive-type gas sensors owing to their low costs and high sensing performances. SMOs can be decorated or doped with noble metals to further enhance their gas sensing properties. Ag is one of the cheapest noble metals, and it is extensively used in the decoration or doping of SMOs to boost the overall gas-sensing performances of SMOs. In this review, we discussed the impact of Ag addition on the gas-sensing properties of nanostructured resistive-based gas sensors. Ag-decorated or -doped SMOs often exhibit better responsivities/selectivities at low sensing temperatures and shorter response times than those of their pristine counterparts. Herein, the focus was on the detection mechanism of SMO-based gas sensors in the presence of Ag. This review can provide insights for research on SMO-based gas sensors.

scholarly journals Nanocrystalline Metal Oxides for Methane Sensors: Role of Noble Metals

2009 ◽  
Vol 2009 ◽  
pp. 1-20 ◽  
Author(s):  
S. Basu ◽  
P. K. Basu
Keyword(s):  
Metal Oxide ◽  
Metal Oxides ◽  
Noble Metal ◽  
Gas Sensors ◽  
Noble Metals ◽  
Industrial Applications ◽  
Metal Catalyst ◽  
Nanocrystalline Metal ◽  
Sensing Properties

Methane is an important gas for domestic and industrial applications and its source is mainly coalmines. Since methane is extremely inflammable in the coalmine atmosphere, it is essential to develop a reliable and relatively inexpensive chemical gas sensor to detect this inflammable gas below its explosion amount in air. The metal oxides have been proved to be potential materials for the development of commercial gas sensors. The functional properties of the metal oxide-based gas sensors can be improved not only by tailoring the crystal size of metal oxides but also by incorporating the noble metal catalyst on nanocrystalline metal oxide matrix. It was observed that the surface modification of nanocrystalline metal oxide thin films by noble metal sensitizers and the use of a noble metal catalytic contact as electrode reduce the operating temperatures appreciably and improve the sensing properties. This review article concentrates on the nanocrystalline metal oxide methane sensors and the role of noble metals on the sensing properties.

scholarly journals Trends and Advances in the Characterization of Gas Sensing Materials Based on Semiconducting Oxides

Sensors ◽  
2018 ◽  
Vol 18 (10) ◽  
pp. 3544 ◽  
Author(s):  
David Degler
Keyword(s):  
Metal Oxides ◽  
Gas Sensors ◽  
Gas Sensing ◽  
Academic Research ◽  
Spectroscopic Techniques ◽  
Characterization Methods ◽  
Fundamental Properties ◽  
Electronic Imaging ◽  
Semiconducting Metal Oxides

The understanding of the fundamental properties and processes of chemoresistive gas sensors based on semiconducting metal oxides is driven by the available characterization techniques and sophisticated approaches used to identify structure-function-relationships. This article summarizes trends and advances in the characterization of gas sensing materials based on semiconducting metal oxides, giving a unique overview of the state of the art methodology used in this field. The focus is set on spectroscopic techniques, but the presented concepts apply to other characterization methods, such as electronic, imaging or diffraction-based techniques. The presented concepts are relevant for academic research as well as for improving R&D approaches in industry.

Thin-film gas sensors based on semiconducting metal oxides

1995 ◽  
Vol 23 (2-3) ◽  
pp. 119-125 ◽  
Author(s):  
H Meixner ◽  
J Gerblinger ◽  
U Lampe ◽  
M Fleischer
Keyword(s):  
Thin Film ◽  
Metal Oxides ◽  
Gas Sensors ◽  
Semiconducting Metal Oxides
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