| 报告题目 | Advanced in Situ Characterization for Accelerating the Design of Nanocrystal Catalysts |
| 报告人 | 吴立恒 博士 |
| 报告人单位 | Stanford University, SLAC National Accelerator Laboratory |
| 报告时间 | 2018-05-31 |
| 报告地点 | 合肥微尺度物质科学国家研究中心九楼会议室（9004） |
| 主办单位 | 合肥微尺度物质科学国家研究中心、中国科学技术大学化学与材料科学学院 |
| 报告介绍 | 报告摘要：
Synthesizing nanocrystals with precisely controlled size, shape, and structure is of great importance for understanding their properties, especially catalysis. Although significant developments have been achieved in colloidal synthesis in the past two decades, it remains challenging to synthesize nanocrystal catalysts in a predictive way due to a lack of mechanistic understanding of the synthesis. In this seminar, I will discuss my recent research efforts on using synchrotron-based X-ray scattering to investigate the formation mechanisms of nanocrystals in real time under typical colloidal synthetic conditions.
The first part of this talk describes using in situ small angle X-ray scattering (SAXS) to elucidate the formation kinetics of monometallic Pd nanocrystals in the presence of different ligands. The quantitative understanding provides the basis for precisely synthesizing a broad library of monodisperse Pd nanocrystals with 1 nm size control. In the second part, I will discuss an unprecedented rapid crystallization of nanocrystals into three-dimensional superlattices at high temperatures and their continuous growth within the superlattice structures observed using in situ SAXS, which provides new insights on interparticle interactions during colloidal synthesis. Finally, by coupling the SAXS with the wide angle X-ray scattering (WAXS), I will demonstrate that the in situ X-ray scattering allows us to study the formation of bimetallic PtSn nanocrystals at the atomic scale. This type of in situ characterization can be readily extended to other multimetallic systems to advance their synthetic design.
报告人简介： 吴立恒本科毕业于中国科学技术大学材料系，2010年前往美国Brown University化学系攻读博士学位，期间主要研究纳米晶体的可控合成，组装以及它们的磁学和催化性能。2015年11月至今在美国Stanford University和SLAC National Accelerator Laboratory从事博士后研究，主要研究方向为同步辐射原位X射线散射表征纳米晶体的合成以及它们在催化领域的应用。至今以第一作者身份在Nature，JACS， Nano Letters，Chemical Reviews等高影响期刊发表多篇学术论文，总引用次数超过2300次。曾担任Advanced Materials，Advanced Energy Materials，Advanced Functional Materials，Small，Nanoscale，Nano Research等期刊审稿人。 |
