报告题目：Colloidal Nanocrystals: Past, Present, and Future
报告人：美国圣路易华盛顿大学YOUNAN XIA 教授
地点：云顶yd222线路检测玉泉校区第七教学楼影视厅（108室）
时间：2011年10月27日上午10:30
报告摘要：The first synthesis of colloidal nanocrystals can be traced back to the work by Michael Faraday in 1856 when he demonstrated the preparation of gold colloids with a ruby-red color. Only within the last decade have chemical methods become available for producing noble-metal nanocrystals in the quality, quantity, and reproducibility required for a systematic study on their properties as a function of size, shape, and structure, and for exploration of their new applications. In this talk, I will briefly discuss some of these developments, with a focus on shape-controlled synthesis of noble-metal nanocrystals. Controlling the shape of a nanocrystal may initially seem like a scientific curiosity, but its goal goes far beyond aesthetic appeal. For noble-metal nanocrystals, shape not only determines their chemical, plasmonic, and catalytic properties but also their relevance for electronic and photonic applications. While the synthetic methodology mainly involves solution-phase redox chemistry, we have been working diligently to understand the complex physics behind the simple chemistry – that is, the nucleation and growth mechanisms leading to the formation of nanocrystals with specific shapes. For example, we have discovered that the shape of silver nanocrystals are dictated by both the crystallinity and shape of the seeds, which are, in turn, controlled by factors such as reduction rate, oxidative etching, and surface capping. The same mechanism also works for other noble metals including gold, palladium, platinum, and rhodium. The success of these syntheses has enabled us to tailor the electronic, plasmonic, and catalytic properties of noble-metal nanocrystals for a range of applications.
YOUNAN XIA教授简介：Younan Xia is the James M. McKelvey Professor for Advanced Materials in the Department of Biomedical Engineering at Washington University in St. Louis. His research interests include development of new methodologies for controlling the synthesis of nanomaterials and exploration of their applications in biomedical and energy research. He received a B.S. degree in chemical physics from the University of Science and Technology of China (USTC) in 1987 and then worked as a graduate student on inorganic nonlinear optical crystals in the Chinese Academy of Sciences. He came to the States in 1991, received a M.S. degree in inorganic chemistry from University of Pennsylvania (with the late Professor Alan G. MacDiarmid) in 1993, and a Ph.D. degree in physical chemistry from Harvard University (with Professor George M. Whitesides) in 1996. He continued his training at Harvard as a postdoctoral fellow for one additional year, joined the University of Washington (UW) in Seattle as an Assistant Professor of Chemistry in 1997, and was promoted to Professor in 2004. His group relocated to Washington University in St. Louis (WUSTL) in the summer of 2007. Dr. Xia has received a number of awards, including a Materials Research Society (MRS) Fellow (2009); an NIH Director's Pioneer Award (2006); a Leo Hendrik Baekeland Award from the North Jersey Section of ACS (2005); a Camille Dreyfus Teacher Scholar (2002); a David and Lucile Packard Fellow in Science and Engineering (2000); an NSF CAREER Award (2000); an Alfred P. Sloan Research Fellow (2000); an ACS Victor K. LaMer Award (1999); and a Camille and Henry Dreyfus New Faculty Award (1997). He has co-authored more than 480 publications in peer-reviewed journals with an h-index of 113. He was named a Top 10 Chemist and Materials Scientist based on the number of citation per paper. He is an Associate Editor of Nano Letters since 2002, and serves on the international advisory boards of Angewandte Chemie International Edition, Accounts of Chemical Research, Advanced Healthcare Materials, Advanced Functional Materials, Nano Today, Nano Research, and many others.
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联系人：张辉，电话15105812846
