Xiong, Wei
Investigation of Charge Dynamics and Molecular Conformations at Interfaces

Contact Information
Assistant Professor of Chemistry and Biochemistry

Office: Pacific Hall B100C
Phone: 858-534-0270
Email: w2xiong@ucsd.edu
Web: ultrafast.ucsd.edu
Group: View group members
Education
2011 Ph.D., University of Wisconsin, Madison
2006 B.S., Peking University
Appointments
2014 Asst. Professor, UCSD
2011 Postdoc, University of Colorado, Boulder
Awards and Academic Honors
2017
DARPA Director's Fellowship
2016
AFOSR Young Investigator Program Award (YIP)
2015
DARPA Young Faculty Award (YFA)
Research Interests
1. Theoretical results demonstrate that interfacial molecular conformations directly influence charge separation dynamics in polymer blend solar cells. Experimentally, it would be very beneficial to be able to monitor the interaction between interfacial conformations and dynamics. However, since charge separation mostly happens at disordered hidden interfaces in thick samples, it is very challenging to capture such processes using existing spectroscopic techniques. We will develop ultrafast surface sensitive spectroscopy to follow both the charge separation dynamics and interfacial conformation simultaneously.

2. The chemical physics of electrocatalysts is complicated and remain a challenge to study, because it happens right at the interfaces. Understanding the microscopic molecular properties at liquid/solid interfaces will be the key for designing new catalysts for better selectivity and lower overpotential. We are specialized in a new interface sensitive technique, called heterodyne 2D SFG spectroscopy, which are able to follow ultrafast dynamics at interfaces. We are interested in using it to determine molecular structure and dynamics of catalysts at liquid/solid interfaces, and transition dynamics in situ.

3. Many Interfaces of materials are heterogeneous. Thus, it would be powerful to visualize molecular conformations and dynamics without confusions from spatial ensemble averaging. We are interested in developing heterodyne SFG based microscopy to visualize heterogeneous interfaces, including MOFs, host-guest self-assemblies, and sea surface monolayers
Primary Research Area
Physical/Analytical Chemistry
Interdisciplinary interests
Materials
Atmospheric and Environmental

Image Gallery


HD SFG Microscopy

CO2 surface catalysts probed by HD 2D SFG


Measuring Molecular Orientations on an Interface
Selected Publications