| 报告题目 | Ag-Au Bimetallic Nanocubes with Enhanced SERS Property and Chemical Stability |
| 报告人 | Prof. QIN Dong |
| 报告人单位 | School of Materials Science and Engineering, Georgia Institute of Technology |
| 报告时间 | 2014-07-07 |
| 报告地点 | 合肥微尺度物质科学国家实验室一楼科技展厅 |
| 主办单位 | 合肥微尺度物质科学国家实验室、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：
Surface-enhanced Raman scattering (SERS) relies on the localized surface plasmon resonance and enhancement of electromagnetic fields around metal nanostructures to drastically increase the Raman scattering cross sections of molecules in close proximity to the nanostructures. It has been documented that Ag nanocubes embrace SERS properties with enhancement factors up to 106 at visible excitation wavelengths for highly sensitive detection of chemical or biological species. Unfortunately, elemental Ag is highly susceptible to oxidation under conditions that involve oxidants, halide ions, acids, water, UV-irradiation, and heating. Such chemical instability often results in changes to the morphology of Ag nanostructures, particularly at corners and edges with high surface free energies, and ultimately compromise their performance in SERS.One potential solution to improve the chemical stability of Ag nanostructures is to form alloy with a more stable metal such as Au. In this talk, I will report an approach to complementing the galvanic replacement reaction between Ag nanocubes and HAuCl4 with co-reduction by a reducing agent for the formation of Ag-Au hollow nanostructures with enrichment of Ag to greatly enhance SERS activity. Additionally, I will report our latest development in the galvanic replacement-free seeded growth of Au on Ag nanocubes with excellent SERS property and chemical stability.
个人简介：
Dr. Dong Qin is an Associate Professor in the School of Materials Science and Engineering at Georgia Institute of Technology. Her academic records include a B.S. in chemistry from Fudan University, a Ph.D. in physical chemistry with Professor Hai-Lung Dai from the University of Pennsylvania, a postdoctoral stint in materials science with Professor George M. Whitesides at Harvard University, and an MBA from the University of Washington. Dr. Qin began her independent career as a founding member of the Center for Nanotechnology at the University of Washington in Seattle where she applied her scientific expertise to develop a number of multidisciplinary research initiatives with faculty engaged in research across disciplines (1997-2007). Recruited by Washington University in St. Louis, Dr. Qin played a big role as the Associate Dean for Research in the School of Engineering and Applied Science (2007-2011). She was also the site director of the NSF-supported National Nanotechnology Infrastructure Network (NSF-NNIN) at Washington University with a strong commitment to provide unique capabilities at intersections of nanotechnology and public health and environment (2009-2011). In January 2012, Dr. Qin started her appointment as the Associate Professor of Materials Science and Engineering at Georgia Tech. Her research interest centers on the cutting-edge research that bridges traditional fields of chemistry and materials science, with a focus on peculiar properties and applications enabled by materials and systems at the nanoscale. Her expertise includes nanomaterials, surface-enhanced Raman spectroscopy (SERS), soft lithography, self-assembly, colloidal physics and chemistry, and responsible development of nanotechnology. |
