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通过不同条件的水热法和溶胶-凝胶技术分别制备了单分散SnO2纳米粉体。利用X射线衍射、透射电子显微镜和比表面积分析仪对产物进行了检测,采用静态配气法测试了样品的气敏性能。结果表明,水热时间越长,颗粒尺寸越大,以反应时间为6 h制备的粉体比表面积最大;溶胶-凝胶产物中,以SnCl2的乙醇溶液为原料制得的颗粒克服了热处理过程中产物易团聚的问题,颗粒尺寸均匀,具有良好的分散性和较高的比表面积。两种方法制备的粉体均对酒精具有良好的灵敏度,SnCl2的乙醇溶液为原料、溶胶-凝胶技术获得的材料对酒精的灵敏度更高,并认为热处理过程中Cl-的去除是导致材料气敏性能不同的主要因素。
Monodispersed SnO2 nano-powders were prepared by hydrothermal method and sol-gel technique under different conditions. The products were tested by X-ray diffraction, transmission electron microscopy and surface area analyzer. The gas sensitivity of the samples was tested by static gas distribution method. The results showed that the longer the hydrothermal time, the larger the particle size and the largest specific surface area of the powder prepared with the reaction time of 6 h. In the sol-gel product, the particles obtained from the ethanol solution of SnCl2 overcame the heat treatment process In the product easy agglomeration problem, uniform particle size, with good dispersion and high specific surface area. The two kinds of prepared powders have good sensitivity to alcohol, the ethanol solution of SnCl2 is the raw material, and the material obtained by the sol-gel technology is more sensitive to alcohol. It is considered that the removal of Cl- during the heat treatment results in the decrease of the material gas Sensitivity performance of different main factors.