【摘要】 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%、5%、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。更多还原

【Abstract】 To improve the gas sensing properties of sensing materials based on WO3,WO3 powders were prepared by chemical reduction method in liquid phase.SnO2-WO3 composites with various SnO2 contents(0.5wt%,1wt%,3wt%,5wt%,10wt%)were prepared by microwave assisted liquid-phase method.The materials were characterized by means of X-ray diffraction and scanning electron microscopy,and the effects of SnO2 doping to WO3 on its sensing properties was investigated.Gas sensing tests reveal that SnO2(3%)-WO3 exhibits the best selectivity and sensitivity towards H2S,the sensitivity of SnO2(3%)-WO3 to 10×10-6 H2S reaches 65 and to 50×10-6 H2S reaches 169 at 160℃,and there is a good linear between sensitivity and concentration.Pure WO3 and SnO2(3%)-WO3 have good anti-humidity during the relative humidity RH=22%-64%.更多还原