二氧化钒基核壳纳米结构可控制备及其变温光电性能研究

项目名称： 二氧化钒基核壳纳米结构可控制备及其变温光电性能研究

项目编号： No.61204018

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 信息四处

项目作者： 尹海宏

作者单位： 南通大学

项目金额： 28万元

中文摘要： 利用宽禁带氧化物（MxOy）纳米结构形貌多样、易于制备的特点，提出以MxOy纳米结构 (如ZnO，SnO2等)为模板，结合溅射、CVD以及ALD等方法，实现具有热致相变特性的VO2/MxOy核壳纳米结构的可控制备，以克服VO2纳米结构CVD法制备形貌单一，紧贴衬底，难以大量制备等缺点。利用VO2热致相变特性，研究VO2/MxOy核壳纳米结构的变温场致发射和变温光致发光性能，探索该材料在新型温控场发射器件和温控光致发光器件方面的应用。重点研究核壳层厚度、形貌、择优生长取向对该核壳纳米结构的变温场致发射和变温光致发光性能的影响；通过第一性原理和分子动力学等理论方法研究VO2/MxOy界面相互作用引起的微观精细结构、相变温度和电子结构的变化，探讨温度、微观精细结构、电子结构和光电性能间的相互关系，寻找具有优异变温场发射和变温光致发光性能的最佳结构参数和最佳生长环境。

中文关键词： 核壳纳米结构；温控；场发射；光致发光；光催化

英文摘要： VO2 nanostructures synthesized via CVD routes usually show simple morphology, low yield and often grow along the substrate surface. To overcome the shortcomings of these VO2 nanostructures, nanostructures of some wide-gap semiconductors (MxOy) are used as templates. Because MxOy nanostructures (ZnO or SnO2) can be easily synthesized and exhibit various morphologies, VO2/MxOy core-shell nanostructures with various morphologies can be synthesized via sputtering, CVD and ALD methods, when MxOy are used as cores. Utilizing the metal-insulator-transition properties of VO2, field emission (FE) and photoluminescence (PL) properties of VO2/MxOy nanostructures depending on different temperatures are to be investigated. Their applications in new generation temperature-controlled electron emitters and PL devices are also to be studied. In this project, investigations mainly focus on the influence of structural characteristics such as morphologies, preferred orientation and layer thickness of VO2/MxOy nanostructures on the temperature-dependent FE and PL properties. By using theories such as first-principles density function and molecular dynamics simulation, the interface effect, electronic structure and phase transition temperature of VO2/MxOy nanostructures will be calculated and investigated. The mechanism of their infl

英文关键词： Core-Shell Nanostructures；Temperature-Control；Field Emission；Photoluminescence；Photocatalysis