Abstract
Gas sensors have been wildly used in various fields related to people's lives. Gas sensor materials were the core factors that affected the performances of various gas sensors, and these have attracted much attention from scientific researchers due their high sensitivity, high selectivity, adjustable reliability, low cost, and other advantages. The preparation of nanostructures with a highly specific surface area was a useful method to improve the gas-sensing performance of a metal oxide semiconductor. Meanwhile, lots of research has focused on preparing nanostructures with a highly specific surface area. This paper has explored some fabricated sensors with high sensitivity, good selectivity, and long-term stability, which has also made them promising candidates for toxic gas detection. Besides, this paper has reviewed the development status of metal oxides used as gas sensors.
Highlights
Gas sensors depends on converting gas into electrical signal output through chemical and physical effects in order to detect the composition and concentration of gas
Most of the gas sensors have been surface-controlled resistance sensors in which the sensitive materials of semiconductor resistance gas sensors are mainly concentrated in metal oxide semiconductors (Jeong et al, 2019)
The results indicated that the existence of a Pt and Cu layer reduced the working temperature of the WO3 sensor; the WO3 nano thin film activation by the Pt layer significantly reduced the working temperature of the sensor
Summary
Gas sensors depends on converting gas into electrical signal output through chemical and physical effects in order to detect the composition and concentration of gas. Metal oxide materials have outstanding physical and chemical properties, are of low cost to produce, and have simple preparation methods (Wang et al, 2019). They have been increasingly used in gas sensing. Song et al prepared hollow porous core-shell NiO nanotubes using a hydrothermal method. Due to the large specific surface area, the sensitivity of the NiO gas sensor to 50 ppm ethanol gas was very high. It was believed that the hollow porous core-shell structure enabled ethanol molecules to diffuse and transport rapidly into the interior of the sensor, and so the material showed an excellent gas-sensing performance
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