High-sensitivity SO2 Gas Sensor Based on Noble Metal Doped WO3 Nanomaterials
Hang Liu, Jiani Zhou, Lanyi Yu, Qiuchen Wang, Bing Liu, Peihua Li, Yuhong Zhang
Abstract
In this paper, the WO 3 nanoparticles(NPs) were prepared by a facile and low cost chemical coprecipitation method. Then the Pt-WO 3 and Au-WO 3 were synthesized. The morphologies of the samples were represented by XRD and SEM. Sensing characteristics of novel metal doped WO 3 sensors were investigated by exposure to SO 2 gas at different operating temperature. The sensor response for SO 2 gas was measured with different concentrations from 100 ppb to 16 ppm. As a result, the 1 wt%Pt-WO 3 sensor presented a greatly low detection limit of 100 ppb at optimum operating temperature of 160 °C. The sensitivity of 1 wt%Pt-WO 3 sensor for 100 ppb reached 4.1. As well as a better sensor response as compared to the other SO 2 gas sensor. It demonstrated that the Pt-WO 3 materials may be used to develop the commercial SO 2 gas sensor.