为改善WO3基敏感材料的气敏性能,先采用液相还原法制备得到WO3粉体,再通过微波辅助液相法制备了SnO2掺杂量为0.5％、1％、3％、05％、10％(质量分数,下同)的SnO2 -WO3复合材料.采用XRD和SEM对材料的物相、形貌进行了表征,并研究了掺杂SnO2对WO3气敏性能的影响.结果表明,掺杂3％的SnO2可显著提高WO3对H2S的灵敏度和选择性,在工作温度为160℃时,元件对体积浓度为10×10-6 H2S的灵敏度达65,对体积浓度为50×10-6 H2S的灵敏度高达169,且灵敏度与气体浓度呈现良好的线性关系.此外,纯WO3和SnO2(3％) -WO3材料在相对湿度RH=22％～64％时有良好的抗湿性.
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