Abstract
Tungsten oxide(WO3) nanocrystals have been synthesized successfully by a simple solvent-regulated solvothermal approach. The as-obtained sample was investigated by field emission scanning electron microscope (FESEM), X-ray diffraction (XRD) and transmission electron microscopy (TEM). The NO2-sensing properties of WO3 nanocrystals were also investigated. It was found that the sensor displayed excellent gas sensing properties to NO2 at the optimal operating temperature of 100°C and behaved as an abnormal p-type semiconductor at near room temperature (RT). The response was about 28.3 and the response-recovery time was around 24 and 137s for 1ppm NO2, respectively, indicating that this structure could be a good candidate for gas sensors. In addition, the possible formation mechanism and gas sensing mechanism were proposed.
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