ZnSnO3-SnO2纳米片分级结构的自组装及气敏特性

摘要

A new type of hierarchical ZnSnO3-SnO2 flower-shaped nanostructure composed of thin nanoflakes as secondary units is successfully prepared through a simple hydrothermal process.The polyhedral ZnSnO3 core acts as a sacrificed template for the growth of hierarchical SnO2 nanoflakes,and the average thickness of SnO2 nanoflakes is around 25 nm.The time-dependent morphology evolution of ZnSnO3-SnO2 samples was investigated,and a possible formation mechanism of these hierarchical structures is discussed.The gas sensor based on these novel ZnSnO3-SnO2 nanostructures exhibits high response and quick responserecovery traits to ethanol (C2H5OH).It is found that ZnSnO3-SnO2 nanoflakes have a response of 27.8 to 50× 10-6 C2H5OH at the optimal operating temperature of 270 ℃,and the response and recovery time are within 1.0 and 1.8 s,respectively.%通过一个简单的水热方法成功地合成出由SnO2纳米片作次级结构的新型花状ZnSnO3-SnO2分级纳米结构.ZnSnO3多面体在生长分级SnO2纳米片的过程中主要起模版作用,制备出的SnO2纳米片的厚度约为25 nm.还讨论了ZnSnO3-SnO2样品的形貌随反应时间变化的规律,并且进一步讨论了形成这种分级结构的形成机制.此外,由这种新型ZnSnO3-SnO2纳米结构作敏感材料的气体传感器对乙醇气体具有高灵敏和快响应的特点.ZnSnO3-SnO2纳米片在最佳工作温度270℃时,对50×10-6乙醇气体的灵敏度约为27.8,其响应和恢复时间分别在1s和1.8s内.