超快激光微纳加工复合热氧化制备自支撑金属氧化物纳米线多尺度图案化结构与功能化研究

金属氧化物纳米线优异的半导体特性、催化活性和化学稳定性，有助于新能源器件中能量的高效捕获、转化和存储，纳米线的“自支撑”三维体系能显著增大比表面积、提高活性材料利用率、加速电/离子输运、电解质扩散和电荷转移，但其制备面临挑战。本项目面向新能源器件的发展需求，研究“自支撑”金属氧化物纳米线多尺度图案化结构的复合制备新方法，利用超快激光以“自上而下”方式在宏观金属基材表面制备微纳米结构，结合“自下而上”热氧化化学生长方式，在微纳米结构之上生长氧化物纳米线，突破纳米线快速生长的基材厚度制约，形成自支撑“宏-微-纳-纳米线”多尺度互联结构体系，并能生长任意图案化纳米线；对自支撑多尺度图案化纳米线进行功能化研究，探索在太阳能电池、锂离子电池、超级电容器等新能源器件中的应用。对该复合方法的机理和科学问题展开系统研究，以实现自支撑多尺度纳米线制备的原理与方法创新及应用创新。本项目具有重要的意义和价值。

Metallic-oxide-nanowires contribute to the highly efficient acquisition, conversion and storage of energy in the new energy device due to their excellent semiconductor properties, catalytic activity and chemical stability. The "self-supporting" three dimensional structures of the nanowires can significantly increase the specific surface area, improve the utilization rate of the active materials, accelerate the electron/ion transportation and increase the electrolyte diffusion and charge transfer. However, their fabrication faces great challenge. Aiming to meet the development needs of new energy device，this project focuses on a novel hybrid fabrication approach of self-supporting multi-scale and pattenable metallic-oxide-nanowires. An ultrafast laser is applied to fabricate unique micro-nano structures on the metal surfaces via “Top down” strategy, by which a chemical thermal oxidation “Bottom up” approach is integrated to form oxide-nanowires in metal surfaces with any macro-scale thickness, this shows an important breakthrough. The oxide-nanowires grow on top of the micro-nano structures based on macro-scale metal substrates, thus forming a self-supporting "macro-micro-nano-nanowire" multi-scale interconnected oxide-nanowire system. The nanowires with arbitrary patterns can be fabricated in this way by means of the programmable scanning capability associated with an ultrafast laser. The functionalization of this self-supporting multi-scale and pattenable metallic-oxide-nanowires will be performed to explore their potential applications in new energy device such as solar cell, lithium ion battery and super capacitor. The mechanism and the scientific issues of this hybrid method will be systematically investigation in order to realize the innovation on the principle, fabrication and applications of this novel self-supporting multi-dimensional oxide-nanowire. This project shows important scientific, technological and application value.