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摘要
In this study, we used WCI6 and 2-propanol to prepare crystalline tungsten oxides (W18O49, 49, WO3) as nitric oxide sensing materials. The crude precursor made from WCI6 and 2-propanol by solvothermal method underwent convention or microwave heat treatments, and the products were characterized by powder X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy and surface area measurement. For the sensing material prepared at 350 degrees C by conventional heat treatment, its structure is oriented monoclinic nanowires and the measured sensor response to nitric oxide was 1.8. The sensor response dramatically increased to 70.3 when the material was prepared at 400 degrees C whose structure was monoclinic nanoparticles. It seems that the microstructure of tungsten oxide strongly affects the sensor response to nitric oxide. A simulation was performed to determine the bonding energy of the gaseous molecule adsorbed on the sensing surface. The sensing mechanisms were proposed to explain the process of adsorption, surface reaction, and desorption.
- 出版日期2015-6
