【百家大讲堂】第221期：面向可预测化的胶体金属纳米晶合成

来源：华体会体育（中国）：2019-07-04

　　讲座题目：面向可预测化的胶体金属纳米晶合成

　　报告人：夏幼南

　　时　间：2019年7月15日上午10:00-12:00

　　地　点：中关村校区研究生楼101报告厅

　　主办单位：研究生院、材料学院

　　报名方式：登录华体会体育微信企业号---第二课堂---课程报名中选择“【百家大讲堂】第221期：面向可预测化的胶体金属纳米晶合成 ”

【主讲人简介】

夏幼南是Brock Family主席和乔治亚理工学院的乔治亚研究联盟（GRA）纳米医学杰出学者。1987年获中国科学技术大学近代化学系学士学位，1993年获宾夕法尼亚大学无机化学硕士学位，1996年获哈佛大学化学与化学生物系博士学位，师从George M. Whitesides教授。他的课题组发明了大量具有可控性能的纳米材料，这些纳米材料在等离子体、电子、光子学、光伏、显示、催化、燃料电池、纳米医学和再生医学等领域得到了广泛应用。例如，他的银纳米线技术已经商业化，用于制造柔性、透明和导电涂层，用于触摸屏、柔性电子和光伏等应用。他的课题组发明的金纳米材料使癌症治疗成为可能。夏幼南在同行评议的期刊上共发表了760多篇出版物，总引用量超过140000次，H指数为189。根据每期出版物的引用次数，他被评为十大化学家和材料科学家。他曾获得多项著名奖项，包括材料研究学会（MRS）奖章（2017年）、美国化学学会（ACS）材料化学奖（2013年）、NIH院长先锋奖（2006年）、斯隆研究奖和帕克基金会科学工程研究奖（2000年）、美国国家科学基金会（NSF）杰出青年教授奖（2000年）。有关更多信息，请访问http://www.nanocage.com。

Younan Xia is the Brock Family Chair and Georgia Research Alliance (GRA) Eminent Scholar in Nanomedicine at the Georgia Institute of Technology. He received a B.S. degree in chemical physics from the University of Science and Technology of China in 1987, a M.S. degree in inorganic chemistry from University of Pennsylvania (with Professor Alan G. MacDiarmid) in 1993, and a Ph.D. degree in physical chemistry from Harvard University (with Professor George M. Whitesides) in 1996. His group has invented a myriad of nanomaterials with controlled properties and these nanomaterials have found widespread use in applications related to plasmonics, electronics, photonics, photovoltaics, display, catalysis, fuel cells, nanomedicine, and regenerative medicine. As an example, his technology on silver nanowires has been commercialized for the manufacturing of flexible, transparent, and conductive coatings for applications such as touchscreen, flexible electronics, and photovoltaics. The gold nanocages invented by his group are enabling cancer theranostics. Xia has co-authored more than 760 publications in peer-reviewed journals, together with a total citation of more than 140,000 and an h-index of 189. He has been named a Top 10 Chemist and Materials Scientist based on the number of citation per publication. He has received a number of prestigious awards, including Materials Research Society (MRS) Metal (2017), American Chemical Society (ACS) National Award in the Chemistry of Materials (2013), NIH Director's Pioneer Award (2006), David and Lucile Packard Fellow in Science and Engineering (2000), NSF CAREER (2000). More information can be found at http://www.nanocages.com.

【讲座信息】

近年的研究表明，还原反应的动力学在金属纳米晶体胶体合成的产物中起着重要的作用。还原反应动力学不仅控制了纳米晶的内部缺陷结构，例如单晶程度，孪晶结构和堆垛层错，并且在种子的成核过程还决定了生长模式（对称或不对称)与生长方式(岛式生长或层式生长)。在这个报告中，将首先简要介绍本课题组近期在成功量化反应动力学参数方面的进展，如速率常数和活化能等。并且进一步介绍如何利用控制反应动力学的方法，实现对金属纳米晶的成核和生长过程的控制，最终实现可预测和可量化的胶体纳米晶合成，及其定量控制。定量测量和控制使我们能够精确地、可重现地调整胶体金属纳米晶体的性质，使其广泛应用于催化、光子学、电子学、能量转换、传感、成像和生物医学等领域。

Recent studies suggest that reduction kinetics play an important role in determining the outcome of a colloidal synthesis of metal nanocrystals. The reduction rate not only controls the internal defect structure, including single-crystal, singly-twinned, multiply-twinned, and stacking-fault lined, of a seed formed in the nucleation step but also dictates the growth pattern (symmetric vs. asymmetric) or mode (island vs. layer-by-layer) of the seed in the following steps. In this talk, I will start with a brief introduction to our recent success in quantifying the kinetic parameters, including the rate constants and activation energies, for a number of systems and then illustrate how this knowledge can be applied to deepen our understanding of the nucleation and growth processes, moving towards the ultimate goal of achieving predictable and deterministic synthesis, together with an easy and quantitative control. The quantitative measure and control allow us to precisely and reproducibly tailor the properties of colloidal metal nanocrystals for a broad range of applications in catalysis, photonics, electronics, energy conversion, sensing, imaging, and biomedicine.