项目名称: 纳米材料形貌可控合成机理的原位同步辐射研究
项目编号: No.11205158
项目类型: 青年科学基金项目
立项/批准年度: 2013
项目学科: 物理学II
项目作者: 姜泳
作者单位: 中国科学技术大学
项目金额: 28万元
中文摘要: 纳米科学技术是上世纪80年代逐步发展起来的新型技术,将会给21世纪的国防、社会和经济带来深刻的变革;在纳米科学领域中,可控合成出具有特定形貌和功能的物质一直是人们所关心的一个重要问题。为了实现这个目标,必须在原子尺度认识纳米材料的成核和生长动力学过程,明确不同生长路径对纳米材材料的形貌和结构的影响。本项目拟在合肥国家同步辐射实验室的XAFS实验站,研制透射QXAFS和UV-Vis两种方法联合在线表征技术,原位研究金属纳米颗粒的成核和生长过程,尤其是纳米颗粒的成核过程。结合XAFS技术对原局域结构的敏感性、和UV-vis对生成物物相的测量,综合反映不同形貌Au和Pt纳米颗粒成核和生长不同阶段的结构状态;同时结合多重散射XAFS以及第一性原理理论计算,建立不同形貌纳米颗粒与其初期成核过程的对应关系,深入探讨其形貌,成核过程以及性能的内在联系,为形貌可控的纳米材料的合成提供依据。
中文关键词: X 射线吸收谱学;紫外可见吸收谱;纳米颗粒;硫醇;
英文摘要: Nanoscience and technology is a new research area developed from the 1980s step by step,and it will bring deep technical changes to national defense,society and economy of 21st century. In the research area of nanoscience,it is always a core question to study the kinetics of nano-materials.To fabricate well-controlled nano-materials, it is essential to understand the nucleation and growth process at atomic level and also the morphologies and structures affected by different growth pathways. This proposal is to build an in-situ colloidal chemical synthesis device at XAFS beamline of Hefei National Synchrotron Radiation Laboratory, combined trans-QXAFS and UV-vis absorption Spectrum, and study the growth process of mental nanoparticles, especially the nucleation process. With the sensitivity of local structure of XAFS technique, combined with UV-vis measurement, multi-scattering XAFS and the first principles calculations, it is possible to study the colloidal chemical synthesis processes of Au and Pt nanoparticles, and to build the relation between morphologies and nucleation pathways. The reveal on the internal relations among morphologies, nucleation paths and functions will provide the experimental and theoretical foundations for fabricating well-defined nano-materials.
英文关键词: XAFS;UV-vis;Nanoparticle;thiol;