A simple co-precpitation method was used to synthesize Sn-doped In2O3 materials, with InCl3·4H2O as the precursor and SnCl4·5H2O as the dopant source. The morphology and structure of the synthesized nanoparticles were examined by X-ray diffraction and scanning electron microscopy (SEM), respectively. Moreover, we investigated the electrochemical properties of the synthesized nanoparticles by electrochemical impedance spectroscopy. The hot-wire type gas sensors based on Sn-doped In2O3 nanoparticles were fabricated, then gas-sensing properties were examined and the gas-sensing mechanism was discussed. SEM observation revealed that the composite nanoparticles had a uniform size in range of 9–20 nm. The responses of the ITO nanocrystalline sensors at 100 ppm ethanol were improved from 256 to 701 mV at 11.1 wt%. Furthermore, the response and recovery time of the ITO nanocrystalline sensors were 15 and 30 s, respectively. The gas-sensing mechanism analysis showed that the electrical conductivity of In2O3 was obviously increased by doping with Sn, thus the responses of the gas sensors to ethanol were significantly improved.
Journal of Materials Science: Materials in Electronics – Springer Journals
Published: Jan 8, 2018
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