Abstract
Abstract WO3 nanorods were synthesized via a simple hydrothermal approach. Their microstructure and morphology were analyzed with x-ray diffraction, scanning electron microscope and x-ray photoelectron spectroscopy. The effects of reaction temperature, reaction time, and citric acid concentration, on the gas-sensing performance of WO3 nanorods were investigated. The optimized response value of WO3 sensor to ethanol gas (100 ppm) was 26.48, with a response time of 1 s under a low operating temperature (160 °C). The recovery capability and stability of the gas sensor were tested and discussed. Additionally, the working principle of WO3 sensor was proposed. In comparison to the sensors published by previous researchers, the WO3 sensor has shown great potential.
Highlights
Along with the development of human society, air pollution has become a serious environmental problem
Ethanol gas is a representative of volatile organic compounds (VOCs), and its prevention and control standards have been continuously improved in recent years[1]
We reported our work on the preparation of WO3 nanorods using the hydrothermal method
Summary
Along with the development of human society, air pollution has become a serious environmental problem. Some types of gas sensors have been developed. The most attractive type of gas sensors is the metal oxide semiconductor (MOS). ZnO3, CoO4, NiO5, and other metal oxides have shown great performance in gas-sensing applications. WO3 is a metal oxide of n-type semiconductor, with superior performance in various fields. WO3 has been widely investigated, owing to its easy structure control and numerous synthetic methods. The methods used to synthesize WO3 have been widely developed, such as sol-gel, template, thermal decomposition, etc. WO3 nanorods were synthesized by hydrothermal method. The gas-sensitive performance of WO3 was investigated by controlling reaction temperature, reaction time and citric acid concentration. The selectivity and the response recovery ability of WO3 were systematically investigated, and the sensing mechanism of WO3 was analyzed
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