SnO_2纳米材料气敏特性研究

Anlaysis on the Gas Sensitivity Property of SnO_2 Nanowires

为了提高SnO2纳米材料的气敏特性,研究其性能与结构关系,采用物理气相沉积法在管式炉内制备SnO2纳米材料.通过控制管式炉内材料的生长温度得到不同形貌的SnO2纳米材料.采用扫描电子显微镜和X射线衍射仪对所得纳米结构进行表征分析.将所得纳米材料制备成旁热式气敏元件对其在还原性目标气体环境中进行气敏性能测试.研究结果表明:不同形貌的纳米结构气敏性能差异明显,SnO2纳米线对指定目标气体的气敏性能优于菊花状纳米结构.气敏性能与材料的表面形貌及比表面积关系密切,长径比高的线状纳米结构具有更高的气敏性能,在酒精蒸汽、CO和CH4的环境中其数值分别为42、21和18.

In order to improve the gas-sensing property of SnO2 nano-structure and study the relationship between property and structure. SnOe nano materials were synthesised by physical vapor deposition method in a typical horizontal tube furnace. Different morphologies of nano materials were grown by controlling the growing temperature. The morphology and structure of SnO2 were characterized by scanning electron microscopy, X-ray diffraction. Different nano-structures of gas sensors were fabricated and the gas-sensing property of nano materials were also investigated. The result shows that the gas-sensing property of different nano-materials are different. It shows that the property of nano-wire is better than the flower-like structure. Gas-sensing property has close relationship between surface morphology and specific surface area. And the structure with high aspect ratio has higher sensitivity. The gas sensing property to alcohol, CO, CH4 are 42,21 and 18 respectively.