Sean T RobertsAssistant Professor
Department of ChemistryEnergy Migration in Excitonic Materials, Dynamics at Surfaces & Interfaces, Nonlinear Spectroscopyroberts@cm.utexas.edu
The University of Texas at Austin
Department of Chemistry, College of Natural Sciences
105 East 24th Street
Austin, TX 78712
BS, University of California Los Angeles, 2003
PhD, Massachusetts Institute of Technology, 2009
Postdoctoral Studies, University of Southern California, 2010-2013
Energy and Charge Migration in Nanoscale Materials
Molecular and nanoscale electronics are exceptionally versatile materials due to ability to tune their electronic properties by changing chemical functionalization or molecular size and shape. Due to their small, dynamics that occur at surfaces and interfaces within these materials often have a disproportionate influence over their properties. The Roberts group seeks to understand how interfacial interactions impact the electronic properties of these materials.
While members of our group work on an array of chemical problems, the theme that runs through each is that we develop new ways of utilizing time-resolved nonlinear spectroscopy to separate dynamics that occur in different areas of the materials we study. Projects currently underway in the group include developing techniques that can selectively examine dynamics at buried interfaces in thin film electronics. We also utilize time-resolved Raman spectroscopy to look at ligand-nanocrystal interactions.
R. W. Johns, M. A. Blemker, M. S. Azzaro, S. Heo, E. L. Runnerstrom, D. J. Milliron, & S. T. Roberts, "Charge Carrier Concentration Dependence of Ultrafast Plasmonic Relaxation in Conducting Metal Oxide Nanocrystals" J. Mater. Chem. C, DOI: 10.1039/C7TC00600D, (2017).
M. S. Azzaro, M. C. Babin, S. K. Stauffer, G. Henkelman, & S. T. Roberts, "Can Exciton-delocalizing Ligands Facilitate Hot Hole Transfer from Semiconductor Nanocrystals?" J. Phys. Chem. C.
120, 28224-34, (2016).
A. K. Le, J. A. Bender, & S. T. Roberts, "Slow Singlet Fission Observed in a Perylenediimide Thin Film" J. Phys. Chem. Lett. 7, 4922-28, (2016).
R. Pandey, A. P. Moon, J. A. Bender, & S. T. Roberts, "Extracting the density of states of copper phthalocyanine at the SiO2 interface with electronic sum frequency generation" J. Phys. Chem. Lett. 7(6), 1060-66, (2016).
S. T. Roberts, "Energy transport: Singlet to triplet and back again" Nature Chem. 7, 764-765, (2015).
S. T. Roberts, A. Mandal, & A. Tokmakoff, “Local and collective reaction coordinates in the transport of the aqueous hydroxide ion” J. Phys. Chem. B. 118(28), 8062-69, (2014).
S. T. Roberts, R. E. McAnally, J. N. Mastron, D. H. Webber, M. T. Whited, R. L. Brutchey, M. E. Thompson, & S. E. Bradforth, “Efficient singlet fission discovered in a disordered acene film” J. Am. Chem. Soc. 134(14), 6388-400, (2012).
National Science Foundation CAREER Award, 2017-2022
ACS Petroleum Research Fund Doctoral New Investigator Award, 2015-2017
Natural Sciences Foundation Advisory Council Teaching Award, 2014
NSF ACC-F Postdoctoral Fellow, 2010-2011
ACS Physical Chemistry Division Postdoctoral Research Award, 2011
Burg Postdoctoral Teaching Fellowship, 2012