基于晶体外延生长原理微/纳米多级结构的设计合成及微结构研究

项目名称： 基于晶体外延生长原理微/纳米多级结构的设计合成及微结构研究

项目编号： No.20803002

项目类型： 青年科学基金项目

立项/批准年度： 2009

项目学科： 金属学与金属工艺

项目作者： 张东凤

作者单位： 北京航空航天大学

项目金额： 20万元

中文摘要： 利用预先制备的纳米粒子为基底，基于外延生长原理和柯肯达尔效应，在有机分子及聚合物的协同作用下对微/纳多级结构的成核位点、生长方式等进行了调控，探索了具有特定几何构造、组成及界面的微/纳多级结构的合成途径。以Cu2O为基底制备了Cu2O/CuxS多级结构材料，通过调节基底的表面状态调节了CuxS壳层的计量比，并通过改变基底的形状进一步调节了复合物的几何构型；通过调节前驱体的种类及溶液的酸碱性获得了Cu2O/CuO及Cu2O/ZnO复合结构纳米材料；以预先制备好的Au纳米粒子为基底，成功制备了Au/磁性粒子多级结构复合纳米材料，发现晶体的外延生长对壳层的稳定性及物相结构都具有重要的作用。 在该项目支持下，共发表SCI论文6篇，其中包括影响因子大于4.0的论文3篇，会议论文3篇，申请国家专利两项，顺利完成了预期发表6-8篇学术论文的目标。

中文关键词： 外延生长；柯肯达尔效应；多级结构；可控合成；

英文摘要： With pre-prepared nanoparticles as substrates and on the basis of epitaxial growth principles and Kirkendall effects, we developed the methods for the fabrication of nano-/micro-hierarchical structures with controlled geometry, components, and interface. Organic small moleculars and polymers were employed to adjust the necleation sites and the growth behaviors of the targets. With pre-synthesized Cu2O as substrates, Cu2O/CuxS hierarchical composites were fabricated. The stoichiometry of the CuxS shell can be modulated by adjusting the surface states of the Cu2O substrates. And the geometry of the products depend on the shapes of the Cu2O substrates. By adjusting the sorts of the precursors and the pH value of the solution, Cu2O/CuO and Cu2O/ZnO composites were achieved. Other than Cu2O, Au nanoparticles were also used as substrates. Au/Co and Au/Ni hierarchical nanostructures were successfully synthesized. It was found that the epitaxia growth plays important roles on the stability and phase structures of the shell. Under the finacial support of this project, 6 papers were published on the international authoritative journals on the related fields. Among them, 3 out of 6 papers are on the journals with index factor larger than 4.0. In addition, we also published 3 papers on meeting paper collections and applied 2 national patents. The expected goals to publish 6-8 specialized papers were successfully achieved.

英文关键词： Epitaxial growth; Kirkendall effects; Hierarchical structures; Controlled synthesis;