ZnO/SnO_2分级纳米结构的制备及气敏特性研究

Preparation and Gas Sensing Properties of ZnO/SnO_2 Hierarchical Nanostructures

结合静电纺丝和水热法制备了ZnO/SnO_2分级纳米结构.扫描电镜结果显示,直径为20~30 nm且粗细均匀的ZnO纳米棒阵列均匀地生长在长2~10μm的SnO_2纳米线上.与纯ZnO纳米棒和纯SnO_2纳米线相比,ZnO/SnO_2分级纳米结构显现出更优越的气敏性能,在300℃下对体积分数为100×10^(-6)的丙酮气体的灵敏度高达22.76,响应时间为13 s,恢复时间为10 s.

ZnO/SnO_2 hierarchical nanostructures were synthesized by the electrospinning method and hydrothermal technique. The scanning electron microscopy（ SEM） showed that ZnO nanorods arrays with the diameter 20 - 30 nm were grown uniformly on the surface of SnO2 nanofibers whose lengths were 2 -10 μm. Compared with pure ZnO and SnO2 nanowires,the ZnO/SnO2 hierarchical nanostructures showed an obvious improvement in gas sensing performance. The response to 100 × 10^-6（ volume fraction） acetone of the sensor based on ZnO/SnO2 hierarchical nanostructures was as high as 22. 76 at 300 ℃,the response time and recovery time was 13 s and 10 s respectively.