激光激活纳米线液相催化生长行为研究

项目名称： 激光激活纳米线液相催化生长行为研究

项目编号： No.51502199

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 一般工业技术

项目作者： 毛晶

作者单位： 天津大学

项目金额： 21万元

中文摘要： 半导体纳米线是纳米功能器件的重要组成部分。催化生长是合成纳米线的重要方法，但是受到催化剂活化温度的限制，气相或者液相催化制备过程均存在制备条件严苛、易得到副产物的局限。且传统的催化生长方法难以实现微观尺度的精确调控获得区域化集成纳米线。本项目提出在液相中利用毫秒脉冲激光选择性加热的特点，仅仅加热激活催化剂纳米颗粒而不引起溶液整体温升实现纳米线催化生长。通过激光辐照下催化剂的催化行为特点、脉冲激光不连续加热导致的纳米线分段生长特点以及淬火效应对纳米线生长的影响三方面进行系统研究，结合纳米线的结构及性能表征，揭示在脉冲激光创造的非平衡条件下纳米线的催化生长机制。提供一条激光液相催化合成一维纳米结构的新途径。这种方法简单绿色，可以打破液相催化方法中溶剂沸点高于金属催化剂熔点的瓶颈限制，克服常规纳米线催化生长工艺的诸多问题，且易于纳米线阵列图案化集成，为纳米材料的实际应用奠定更好的基础。

中文关键词： 脉冲激光；半导体纳米线；催化生长；选择性加热；淬火效应

英文摘要： Semiconductor nanowires exhibit novel electronic and optical properties，and are.considered to be key components in nanoscale device applications. Catalytic.synthesis of nanowires is one of the popularly used methods. Because of the high temperature needed for activation of catalysts, the fabrication of nanowires in a solution or in gas all have many limitations, such as rigorous reaction condition，unavoidable byproducts， and lack of controllability . Pulsed laser can heat the catalyst nanoparticles with high boiling point selectively, which can lead to the activation of catalysts even in a solution. In this project, the catalytic performance of catalyst under laser ablation and the effect of temporal discontinuity and quenching effect of pulse heating of pulsed laser on the formation of nanowires will be explored. Mechanism of nanowires formation induced by pulsed laser will be elaborated. We will provide a simple and green laser assisted strategy for the preparation of one-dimensional nanostructures, which can overcome the limitation of traditional catalytic growth route. It is also beneficial for obtaining of patterned nanowires which can help to extend the applications of one-dimensional nanostructures.

英文关键词： pulsed laser;semiconductor nanowires;catalytic growth;selective heating;quenching effect