WO3 Nanoparticles Applied for Gas Sensor

WO3 nanoparticles are often made into gas sensor for detecting various toxic gases. For example, WO3 nano particles have high sensitivity and selectivity to trimethylamine and high sensitivity to acetic acid, acetaldehyde, acetone, and ethanol gas.

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Some experts have investigated the electrical and gas-sensing properties of calcined WO3 semiconductor materials and characterized the structure and performance of WO3 by using X-ray diffraction, scan electron microscopy and infrared. The results showed that the average grain size of WO3 was 22 nm after calcination at less than 800 °C and 24-26 nm at more than 900 °C for 1 h. The experts also fabricated the sensors of indirect heating type, and investigated the effects of calcining temperature and operating temperature on electrical resistance and sensitivity, and sensitivity-gas concentration properties of the WO3-based sensors. And they found that the sensor based on WO3 exhibited high sensitivity and good response characteristics to ethanol gas.

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