多场耦合诱导的二氧化钒纳米线Mott相变及器件研究

项目名称： 多场耦合诱导的二氧化钒纳米线Mott相变及器件研究

项目编号： No.61204001

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： 胡彬

作者单位： 华中科技大学

项目金额： 24万元

中文摘要： 我们以典型的强关联Mott绝缘体二氧化钒（VO2）为研究对象，以催化剂辅助生长的单晶纳米线形态为载体，通过设计合理的器件实现在单根VO2纳米线上可以同时加载温度、应力、激光这三种不同的物理场，利用三者的耦合效应来调控纳米线发生快速的金属-绝缘相变，并探索潜在的耦合规律，建立相应的三元相图以及物理模型，使研究者对VO2的金属-绝缘相变机制具有更为深入的理解。并合理利用这种特殊的相变行为，控制纳米线逼近相变临界点，来开发集成多种物理场响应模式的高性能VO2纳米线敏感元件。这为基于VO2及其它强关联电子材料微纳功能器件的开发与应用（如高速光控开关，存储器、逻辑门等）提供了新的思路，对于其在传感网络的应用具有重要的科学指导意义。

中文关键词： 二氧化钒；银纳米线；相变；透明电极；光电器件

英文摘要： Mott insulator vanadium dioxide (VO2) as a typical strongly correlated electron material has attracted intense interest. In this project, we will synthesize the VO2 nanobeams through catalyst-assisted physical vapor deposition process, and assemble one nanobeam into a functional device, where can load different physical fields on at the same time. By coupling the multi-physical field effects of stress, temperature and laser, we try to induce the fast and tunable metal-insulator transition of VO2 nanobeam, and explore the potential coupling law. Based on these results, we will establish the corresponding ternary phase diagram and build a reasonable physical models, which is helpful for a deeper understanding of metal-insulator phase transition mechanism. Furthermore, by adjusting the VO2 nanobeam approaches to the critical point of phase transition, we can develop a high-performance sensitive components based on the metal-insulator transition with variety of response modes. This project can enlighten a new way of thinking for development and application of VO2-based micro- and nanodevices (such as high-speed optical control switches, memory, logic gates, etc.), and has important scientific guiding significance for its application in sensor networks.

英文关键词： vanadium dioxide；silver nanowires；phase transition；transparent electrode；optoelectronic devices