High-sensitivity SO2 Gas Sensor Based on Noble Metal Doped WO3 Nanomaterials

In this paper, the WO3 nanoparticles(NPs) were prepared by a facile and low cost chemical coprecipitation method. Then the Pt-WO3 and Au-WO3 were synthesized. The morphologies of the samples were represented by XRD and SEM. Sensing characteristics of novel metal doped WO3 sensors were investigated by exposure to SO2 gas at different operating temperature. The sensor response for SO2 gas was measured with different concentrations from 100 ppb to 16 ppm. As a result, the 1 wt%Pt-WO3 sensor presented a greatly low detection limit of 100 ppb at optimum operating temperature of 160 degrees C. The sensitivity of 1 wt%Pt-WO3 sensor for 100 ppb reached 4.1. As well as a better sensor response as compared to the other SO2 gas sensor. It demonstrated that the Pt-WO3 materials may be used to develop the commercial SO2 gas sensor.