微波水解法制备纳米ZnO及其气敏特性研究

Preparation and Gas-sensing Properties of Zinc Oxide Nano-powders by Microwave Hydrolysis

以Zn(CH3COO)2-2H2O为原料,采用微波水解法和恒温水解法制备了纳米ZnO粉体,用X射线衍射仪、透射电镜对产物的相组成和微观结构进行了表征和分析,并且测试了其气敏特性.为了改善纳米ZnO的气敏性能,利用微波水解法,通过掺杂Pt、Pd贵金属制备出其相应的纳米复合氧化物.与恒温水解法相比,微波水解法所需反应时间显著缩短、反应物浓度提高;两种方法制备的纳米ZnO粉体皆对酒精和汽油具有较高灵敏度;掺杂Pt或Pd可提高纳米ZnO对酒精和汽油的选择性.

ZnO nano-powders were prepared by using microwave hydrolysis and constant temperature hydrolysis methods, using Zn(CH3COO)(2)(.)2H(2)O as the starting material. In order to improve gas sensitivities, ZnO nano-powders doped with Pt of Pd were also prepared by using the microwave hydrolysis method. Their phase constitution and crystal structure were characterized by TEM and XRD analyses, and their gas sensitivities were measured. results show that the microwave hydrolysis method is better than the canstant temperature hydrolysis method, for obtaining ZnO nano-powders. The ZnO nanopowders prepared by using the two methods possess higher sensitivities to ethanol and gasoline, and the ZnO nanopowders doped with Pt or Pd can enhance their selectivities to ethonal and gasoline, respectively.