Synthesis, characterizations and gas sensing properties of nanocrystalline In2O3 thick film sensor

摘要

The nanocrystalline powder of In2O3 with cubic structure prepared by a simple hydrothermal decomposition route. The structure and crystal phase of the powder was characterized by X-ray diffraction (XRD), microstructure by Transmission Electron Microscopy (TEM). The results indicated that the indium oxide was cubic with range size 28.5– 65.8 nm. Gas sensing properties of the nanocrystalline In2O3 thick film sensor were tested for various gases in air at static state. The tested results showed that the sensor based on In2O3 nanocrystals exhibited high response towards H2S gas (40 ppm) at an operating temperature 100°C. The selectivity of the sensor elements for H2S gas against different gases was studied. The results on response and recovery time were also discussed.