中文摘要：

用水热法制备了不同掺杂浓度的WO3：Mo纳米晶粒，研究了WO3：Mo的微结构和形貌，分析了Mo的掺杂浓度对微结构的影响，并研究了该材料对氢气的光学敏感特性。结果表明，所有样品均呈现六方相结构，掺杂浓度为2％（原子分数）样品的（200）晶面的衍射峰最强；随着掺杂量的增加，样品的带隙减小；当工作温度为200℃时，掺杂浓度为2％（原子分数）的样品对浓度5．0×10^-4的氢气表现出良好的光学氢敏特性。

英文摘要：

Mo-doped WO3 nanocrystals with various impurity contents were synthesized by hydrothermal method. The influence of Mo doping content on the microstructure and morphology of WO3 nanocrystals were systematically investigated by X-ray diffraction （XRD）, scanning electron microscopy （SEM） and transmission spectra. And their hydrogen gas-sensor characteristics were also analyzed. The results indicate that all the products exhibit hexagonal phase structure,and intensity of （200） crystal face diffraction peak of sample doping for 2at% was the strongest;with the increased amounts of doping,energy gaps （Eg） of samples decrease gradually; the samples doping for 2at% performs a quite perfect response to 5.0×10^-4 H2 at 200℃.