Preparation and gas sensitive properties of nanometer-sized SnO2 |
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| Authors: | Qingyi Pan ph D Xiaowen Dong Jiaqiang Xu Jianping Zhang Liyi Shi |
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| Institution: | (1) Zhengzhou Institute of Light Industry, China;(2) School of Chemistry and Chemical Engineering, Shanghai University, 149 Yanchang Road, 200072 Shanghai |
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| Abstract: | Nanometer-sized SnO2 particles were prepared by a sol-gel method using inorganic salt as a precursor material. Its crystallization was investigated
by means of TG-DTA, IR absorption spectra, X-ray diffractometry and TEM as well as its resistivity change and the gas sensitivity
varied with temperature were measured in various reducing gas. The results indicate that well-crystallized nano-sized SnO2 with size around 15nm can be obtained at annealing temperature 600°C. The activation energy for the growth of nano-SnO2 was calculated to be 26. 55kJ. mol−1 when the annealing temperature was higher than 500°C. The measurements also show that there is a peculiar resistance change
varied with temperature for nano-SnO2. It has relevance to the increase in surface adsorbed oxygen. The selective detectivities to C4H10 and petrol can be increased when ruthenium ion was doped in nano-SnO2 as a catalyst and so do the gas sensitivity to CO, CH4, H2
etc. when rhodium ion was doped in. The detection to the several reducing gas can be realized when the temperature ranged from
260°C to 400°C. |
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| Keywords: | sol-gel nanometer-sized tin oxide gas sensitive property |
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