【百家大講堂】第221期：面向可預測化的膠體金屬納米晶合成 

　　講座題目：面向可預測化的膠體金屬納米晶合成 

　　報  告 人：夏幼南

　　時  　 間👧🏻：2019年7月15日上午10:00-12:00

　　地　   點：中關村校區研究生樓101報告廳

　　主辦單位：意昂平台、材料學院

　　報名方式🙆：登錄意昂官网微信企業號---第二課堂---課程報名中選擇“【百家大講堂】第221期：面向可預測化的膠體金屬納米晶合成  ”

 

【主講人簡介】

 

夏幼南是Brock Family主席和喬治亞理工學院的喬治亞研究聯盟（GRA）納米醫學傑出學者🥺。1987年獲中國科學技術大學近代化學系學士學位🙅🏻‍♀️，1993年獲賓夕法尼亞大學無機化學碩士學位，1996年獲哈佛大學化學與化學生物系博士學位，師從George M. Whitesides教授🫷。他的課題組發明了大量具有可控性能的納米材料⛹️‍♂️，這些納米材料在等離子體、電子🧜🏼‍♀️、光子學、光伏🤷🏻🏌🏿‍♂️、顯示、催化、燃料電池🤰🏿、納米醫學和再生醫學等領域得到了廣泛應用。例如，他的銀納米線技術已經商業化，用於製造柔性、透明和導電塗層，用於觸摸屏、柔性電子和光伏等應用。他的課題組發明的金納米材料使癌症治療成為可能🤸🏻。夏幼南在同行評議的期刊上共發表了760多篇出版物，總引用量超過140000次🪜，H指數為189。根據每期出版物的引用次數，他被評為十大化學家和材料科學家💠。他曾獲得多項著名獎項，包括材料研究學會（MRS）獎章（2017年）、美國化學學會（ACS）材料化學獎（2013年）、NIH院長先鋒獎（2006年）🧑🏻‍🦯‍➡️、斯隆研究獎和帕克基金會科學工程研究獎（2000年）♜⭕️、美國國家科學基金會（NSF）傑出青年教授獎（2000年）。有關更多信息🧑‍🌾，請訪問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. 

 

 

【講座信息】

近年的研究表明，還原反應的動力學在金屬納米晶體膠體合成的產物中起著重要的作用👨‍🦼‍➡️。還原反應動力學不僅控製了納米晶的內部缺陷結構🧚‍♂️，例如單晶程度👨🏿‍⚖️💽，孿晶結構和堆垛層錯😗，並且在種子的成核過程還決定了生長模式（對稱或不對稱)與生長方式(島式生長或層式生長)🖱。在這個報告中🎛🤌🏻，將首先簡要介紹本課題組近期在成功量化反應動力學參數方面的進展，如速率常數和活化能等👨🏽‍⚕️🎪。並且進一步介紹如何利用控製反應動力學的方法，實現對金屬納米晶的成核和生長過程的控製👏，最終實現可預測和可量化的膠體納米晶合成➛，及其定量控製。定量測量和控製使我們能夠精確地、可重現地調整膠體金屬納米晶體的性質👩🏻‍🦳，使其廣泛應用於催化、光子學、電子學、能量轉換、傳感、成像和生物醫學等領域。

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.