Topic: Ultrafast spectroscopic study of precise structure of nano-gold clusters and perovskite films
Reporter: Dr. Zhou Meng University of Miami
Time: May 18 (Saturday) 09:30
Report location: 504, Life Science Building
Losted by: Institute of Atomic and Molecular Physics
Introduction:
Dr. Zhou Meng, graduated from the School of Physics, Northeast Normal University in 2010, received his Ph.D. from the Institute of Chemistry, Chinese Academy of Sciences in 2015, worked as a postdoctoral researcher in the Department of Chemistry at Carnegie Mellon University in the United States from 2015 to 2018, and from 2018 to present The Department of Physics of Miami is engaged in post-doctoral research. He has long been engaged in femtosecond time-resolved transient spectroscopy and optically excited state dynamics research, using femtosecond laser spectroscopy to study precise structure metal nanoclusters and perovskite film materials. So far, as the first author, he has published 15 papers in Science, PNAS, Nature comm, Angew Chem, JACS, JPCL and other journals.
Abstract:
As the size becomes smaller, the transformation of materials from metals to non-metals has always been a very important scientific problem, and it is also an unsolved mystery that has plagued physicists and chemists for a long time. When the gold size of the bulk is reduced to below 100 nm and becomes gold nanoparticles, the steady-state absorption spectrum will show a surface plasmon resonance peak. When the particle size is further reduced to close to its De Broglie wavelength, discrete energy levels and band gaps will appear due to the quantum confinement effect, thus exhibiting molecular properties. Nano gold particles of this size are called gold clusters. . Metal clusters are an important bridge connecting metals and non-metals, and are the key to understanding the formation of metal properties. The report will introduce the ultrafast spectroscopy study of precise structure of nano-gold clusters and perovskite films. The main contents include (1) exploring the transition of nano-gold clusters from metal to non-metal; (2) controlling the structure of nano-gold clusters Optical properties of clusters; (3) Carrier dynamics of quasi-two-dimensional perovskite film materials.
