基于固态晶种催化生长机理构建一维半导体纳米（异质）结构及其几何构型调控

项目名称： 基于固态晶种催化生长机理构建一维半导体纳米（异质）结构及其几何构型调控

项目编号： No.21201086

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 无机化学

项目作者： 王君礼

作者单位： 江苏大学

项目金额： 25万元

中文摘要： 相比于VLS和SLS机理中液态金属催化剂"Liquid"相的研究，对固态催化剂及其催化纳米线生长机理的认知明显滞后和不足。本项目以亚稳四方或立方相Ag2Se固态纳米晶种在低温溶液中催化生长ZnSe纳米线为典型研究体系，考察亚稳相Ag2Se的结构特性（如高浓度Ag+空位、Ag+的快速迁移）和催化性能，探究Ag2Se/ZnSe固-固生长界面的Ag+/Zn2+离子交换、离子（物质）传输和界面扩散机制，阐明Ag2Se固体晶种催化ZnSe纳米线生长的动力学和化学反应过程。利用晶种保留在纳米线末端的生长特性，通过调控Ag2Se/ZnSe组成比例与组合方式，制备Ag2Se-ZnSe一维纳米异质结构，并实现其几何构型的裁剪。测评由光子与快速移动的Ag+离子相互作用而引起的Ag2Se-ZnSe纳米异质结构的三阶光学非线性（3NLO），注重依据组成和几何构型调节3NLO行为，以此进一步深化课题研究的科学意义。

中文关键词： II-VI族半导体；纳米线合成；催化生长；超离子导体；纳米异质结构

英文摘要： In comparison with the researches on liquid-state metal catalysts (i.e., the "Liquid" phase) involved in the VLS and SLS mechanisms of nanowire growth, the exploration of solid-state catalysts and the understanding of growth mechanisms built on them for nanowires are undeveloped and less-documented. This project will demonstrate a typical, practical example that solid-state Ag2Se nanosized seeds with metastable tetragonal or cubic phase catalyze the growth of ZnSe nanowires in low-temperature solution synthesis, where we will investigate the crystal structure characteristics (e.g., high-concentration Ag+ holes and fast mobility of Ag+ ions) and the catalytic capability of metastable Ag2Se seeds, probe into the problems of Ag+/Zn2+ ion exchange, ion (substance) transport and interface diffusion at the active Ag2Se/ZnSe solid-solid interface of nanowire growth, and then disclose the growth kinetics and chemical reaction processes of ZnSe nanowire growth catalyzed by the solid-state Ag2Se seeds. Meanwhile, based on the catalytic growth feature of seed remaining at the end of nanowire we will conduct the synthesis of one-dimensional Ag2Se-ZnSe heteronanostructures and especially aim to achieve the geometric shape control on the heteronanostructures by tuning the proportions and combination modes of Ag2Se/ZnSe. In ad

英文关键词： Group II-VI semiconductors；nanowire synthesis；catalytic growth；superionic conductors；nanoheterostructures