CHINESE | Nanjing Tech University | CONTACT US
 
  News   
  Events   
  Sparkling Lecture   
  Conferences & Symposia   



  Home News&Events Events 正文
Research Seminar of Prof. Zhan Xiaowei from Peking University and Prof. Wei Wei from University of Florida
Research Seminar of Prof. Zhan Xiaowei from Peking University and Prof. Wei Wei from University of Florida

Lecture Time: 15:00 on 27th April, 2018

Lecture Room: C501 of Science and Innovation Building

Lecturer: Zhan Xiaowei

Lecture Title: The invention of the Star Molecule ITIC

Lecturer: Wei Wei

Lecture Title: Plasmon-Driven Anisotropic Growth of Gold Nanoprisms: Cooperative Action of Surfactants with Light

 

W. David Wei, Ph.D.

Department of Chemistry and Center for Nanostructured Electronic Materials,

 University of Florida, United States, wei@chem.ufl.edu

Abstract

After more than a decade, it is still unknown whether the plasmon-mediated growth of silver nanostructures can be extended to the synthesis of other noble metals, as the molecular mechanisms governing the growth process remain elusive. Herein, we demonstrate the plasmon-driven synthesis of gold nanoprisms and elucidate the details of the photochemical growth mechanism at the single-nanoparticle level. Our investigation reveals that the surfactant polyvinylpyrrolidone preferentially adsorbs along the nanoprism perimeter and serves as a photochemical relay to direct the anisotropic growth of gold nanoprisms. This discovery confers a unique function to polyvinylpyrrolidone that is fundamentally different from its widely accepted role as a crystal-face-blocking ligand. Additionally, we find that nanocrystal twinning exerts a profound influence on the kinetics of this photochemical process by controlling the transport of plasmon-generated hot electrons to polyvinylpyrrolidone. These insights establish a molecular-level description of the underlying mechanisms regulating the plasmon-driven synthesis of gold nanoprisms.  

Biography

W. David Wei (卫 伟) currently is an Associate Professor in the Department of Chemistry of the University of Florida working in analytical, physical, and materials chemistry with research interests in novel electronic and optical properties of metallic and semiconductor nanomaterials and their applications in solar energy harvesting, conversion and storage; visible-light photocatalysis; and chemical and biological detection.  David received his Ph.D. from the University of Texas at Austin with Mike White and trained as a postdoctoral researcher at Northwestern University with Chad Mirkin.  He has also held a visiting research position at Pacific Northwest National Labs (PNNL).  David has more than 60 publications including Chemical Reviews, Nature Materials, Nature Chemistry, JACS, Angewandte Chemie International Edition, Advanced Materials, and Chemical Science, 115 invited talks, and 9 pending patents, and he is a member of the American Chemical Society and American Vacuum Society.  He has been awarded a summer fellowship at PNNL, the ORAU Ralph E. Powe Junior Faculty Enhancement Award, the Sigma Xi Junior Faculty Research Award, the UF-HHMI Science for Life Distinguished Mentor Award, the UF faculty Adviser/Mentor of the Year Award, the NSF CAREER award, and the UF Term Professorship.

  Copyright 2014-2016 ?Institute of Advanced Materials, Nanjing Tech University All Rights Reserved.

  Address: Chemical Engineering Block, 5 Xinmofan Road, Nanjing 210009, China Tel: (86) 25-83587982 Visit:
XML 地图 | Sitemap 地图