Preparation and gas-sensing properties of perovskite-type MSnO_3 (M=Zn, Cd, Ni)

摘要

The MSnO_3 semiconducting oxide that can be used as a gas sensitive material for detecting ethanol gas is reported in this paper. MSnO_3 powders were prepared by a chemical coprecipitation synthesis method. The preparation conditions were carefully controlled. After calcinations at appropriate temperature, the n-type semiconductor gas-sensing materials were obtained. The phases and microstructures of the obtained powders were characterized by X-ray diffraction (XRD) The products corresponded to a small particle size range of 0.1-0.4 μm and high surface area of 60-65 m~2/g. The electrical properties, sensitivity-synthetic conditions and operating temperatures, and selectivity of MSnO_3-based sensors were investigated. It was found that sensors had good sensitivity to vapor of C_2H_5OH. Gas-sensing mechanism was studied with X-photoelectron energy spectra (XPS).