二氧化钒具有独特的接近室温的金属-绝缘体相转变特性，能被应用于红外探测、热能调节等多个领域，但是目前制备二氧化钒的方法复杂、成本高昂，而且二氧化钒单晶块体的循环稳定性非常差，不利于实际应用；另外，应变和掺杂能大大影响二氧化钒的物理性能，但其机理仍然不清楚。本项目拟发展发展一种简单、快速、低值的制备微米尺度的、中空的二氧化钒单晶阵列的方法，分析所制备二氧化钒单晶阵列的生长机理；采用X射线衍射、几何相位分析等微纳米材料应变测量方法，全面测定所制备的二氧化钒单晶阵列的应变状态，分析应变与二氧化钒单晶阵列的相转变温度和光学性能之间的关系；再发展一种简便的过渡金属掺杂策略，制备过渡金属掺杂的二氧化钒单晶阵列，分析过渡金属掺杂对二氧化钒单晶阵列的相转变温度和光学性能的影响规律；结合第一性原理模拟计算，探索应变和掺杂对二氧化钒单晶阵列相转变温度和光学性能影响的物理机制。

Vanadium dioxide has unique phase transition characteristics of metal-insulator close to room temperature, which can be applied in infrared detection, thermal energy regulation and other fields. However, the current methods for preparing vanadium dioxide are complex and costly. Meanwhile, the cycling stability of bulk single crystal of vanadium dioxide is very poor, which is not conducive to practical application. It was known that strain and doping can greatly affect the physical properties of vanadium dioxide, but their mechanisms are still unclear. This proposal intends to develop a simple, rapid and low cost method for preparing micro-scale and hollow single crystal array of vanadium dioxide, and analyze the growth mechanism of the prepared single crystal array of vanadium dioxide. The strain state of the prepared single crystal array of vanadium dioxide was comprehensively determined by micro/nano-scale material strain measurement methods such as X-ray diffraction, geometric phase analysis. The relationship between the strain state and the phase transition temperature and optical properties of the single crystal array of vanadium dioxide will be analyzed. Then, a simple transition metal doping strategy will be developed to prepare the transition metal doped vanadium dioxide single crystal array. The influence of transition metal doping on the phase transition temperature and optical properties of the vanadium dioxide single crystal array will be analyzed. Combinating with first principles simulation, the physical mechanism of the influence of strain and doping on the phase transition temperature and optical properties of vanadium dioxide single crystal array will be investigated.