以SnCl4·5H2O和氨水为原料、水和乙醇的混合溶液为溶剂,采用水热法制备纳米SnO2。利用粉末X射线衍射、透射电子显微镜和紫外--可见吸收光谱对纳米SnO2样品进行了表征。结果表明:纳米SnO2为金红石结构,晶粒尺寸在2.8~5.3nm,平均晶粒尺寸为3.5nm,颗粒大小均匀、分散性好。进一步制备SnO2气敏元件并评价其气敏性能,发现纳米SnO2样品对乙醇蒸汽具有很高的灵敏度、很好的选择性和快速响应--恢复时间等优越的气敏特性。 SnCl4 · 5H2O and ammonia as raw materials, a mixed solution of water and ethanol as a solvent, the use of hydrothermal Preparation of nano-SnO2. Nanosized SnO2 samples were characterized by powder X-ray diffraction, transmission electron microscopy and UV-Vis absorption spectra. The results show that the nano-SnO2 is rutile, the grain size is 2.8-5.3nm, the average grain size is 3.5nm, the particle size is uniform and the dispersion is good. SnO2 gas sensor was further prepared and its gas sensing performance was evaluated. It was found that the SnO2 sample has high sensitivity to ethanol vapor, good selectivity and rapid response - gas sensing properties such as recovery time.