SnO2-WO3复合金属氧化物对丙酮的气敏性能

Acetone Sensing Properties of SnO2-WO3 Metal Oxide Composites

用SnO2对WO3纳米片表面进行修饰,制备了SnO2-WO3复合材料,并通过扫描电子显微镜和X射线单晶衍射对所制备的材料形貌和晶体结构进行表征。实验结果表明:制备的WO3具有纳米片状结构,厚度约为20~30 nm。随着SnO2含量的增加,复合材料逐渐形成表面附着片的球状结构,球的直径约为2.5μm。此外,气敏性能测试研究表明:由复合量为0.2 mmol SnO2的SnO2-WO3复合材料制成的传感器对丙酮具有最佳的气敏性能,其最佳工作温度为300℃,此时的响应值为纯WO3纳米片的2倍左右,并且对体积分数为2×10-8的丙酮气体有响应。因此,该SnO2-WO3复合材料可以作为一种优良的丙酮气敏材料。

SnO2-WO3 composite materials were prepared by surface modification of WO3 nanosheets with SnO2.Their morphology and crystal structure were characterized by scanning electron microscopy and X-ray powder diffraction. The experimental results indicate that WO3 has nano-flake structure with a thickness of 20-30 nm.With the addition of SnO2,the composite material gradually changed into a spherical structure attached by some sheets with the diameter of about 2.5 μm. The tests demonstrate that the obtained SnO2-WO3 composite material with 0.2 mmol SnO2 has excellent gas sensitivity to acetone,the response value is about twice that of the pure WO3 nanosheets at the optimum working temperature of 300 ℃,and it responds to acetone gas with a volume fraction of 2×10-8. Therefore,the synthesized SnO2-WO3 composites can be used as an excellent gas-sensing material for acetone.