ZnO/Ag异质结纳米阵列的原位构筑及场发射机理探索

项目名称： ZnO/Ag异质结纳米阵列的原位构筑及场发射机理探索

项目编号： No.21201156

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 无机化学

项目作者： 李飞

作者单位： 中国地质大学（武汉）

项目金额： 23万元

中文摘要： 本项目针对目前ZnO场发射性能研究中存在的功函数较大的问题，利用金属Ag良好的导电性和较低的功函数，通过ZnO/Ag异质结纳米阵列从整体上降低ZnO的有效功函数，从而提高ZnO的场发射性能。以ZnO/Ag异质结纳米阵列为研究对象，首先采用Sn2+离子敏化ZnO纳米阵列，利用Sn2+离子的强还原性在ZnO纳米阵列上生长Ag种子，继而利用Ag种子诱导Ag纳米粒子在ZnO纳米阵列上生长，最终获得ZnO/Ag异质结纳米阵列。研究生长条件对Ag的负载量、均匀性、厚度及形貌的影响，研究提高ZnO纳米阵列与Ag界面结合的方法，建立ZnO/Ag异质结纳米阵列的生长条件与场发射性能之间的内在规律，对ZnO/Ag异质结纳米阵列的电子结构进行理论计算，探讨Ag在提高ZnO纳米阵列场发射性能中的增强机理。该项研究立足学科前沿，将为ZnO/Ag异质结纳米阵列的开发应用提供重要的理论基础和试验依据。

中文关键词： ZnO/Ag；异质结；原位构筑；场发射性能；增强机理

英文摘要： At present, the high work function of ZnO is the main problem in the research of the field emission property of ZnO.The project uses the low work function and excellent conductivity of Ag to enhance the field emission property of ZnO through ZnO/Ag heterojunction nanoarrays. In the project, at first, we used Sn2+ to sensitize ZnO nanoarrays. Due to the strong reductibility of Sn2+, Ag+ was reduced to Ag seeds on the surface of ZnO nanoarrays. And then, Ag nanoparticles were prepared on the ZnO nanoarrays via the inducement of Ag seeds. Finally, the ZnO/Ag heterojunction nanoarrays were in-situ built successfully.The effects of preparation conditions on the loading, uniformity, thickness and morphology of Ag was discussed and the method to improve the interfacial interaction between ZnO nanoarrays and Ag was explored. The inherent principle between preparation conditions and field emission properties was established. We caculated the electronic structure of ZnO/Ag heterojunction nanoarrays and discussed the enhancement mechanism of Ag in the improvement of field emission property of ZnO nanoarrays. The research is grounded firmly in academic foreland and will offer important theoretic foundation and experimental basis for the development and application of ZnO/Ag heterojunction nanoarrays.

英文关键词： ZnO/Ag；heterojunction；in-situ building；field emission properties；enhancement machanism