Please post and forward to your groups:
Center for Excitonics Seminar Series presents:
Spectroscopy of single conjugated polymers and aggregates
May 2, 2017 at 4:30pm/36-428 RLE Haus Room (add to your
calendar<https://www.dropbox.com/s/y8ous92kxzlukik/David%20Vanden%20Bout…)
David Vanden Bout
University of Texas, Department of Chemistry
[
http://www.rle.mit.edu/excitonics/wp-content/uploads/2016/06/vanden_bout-cr…]
A comprehensive understanding about the structure-photophysics correlations in conjugated
polymers (CPs) is crucial for its development in optoelectronics. Unfortunately, this has
remained elusive to date largely due to the macroscopic heterogeneity in both structural
and photophysical properties of polymer materials. With single molecule/aggregate
spectroscopy, we performed a systematic examination on the relationship between structure
and important photophysical properties from single polymer chain up to bulk state. Single
polymer chain conformation was studied using polarization spectroscopy to examine how
side-chains affect folding of the polymers. The effects of this folding are then
correlated with differences in both single molecule spectra as well as transient
"blinking". Single molecules and aggregates of a variety of polythiophenes were
examined. Tunable interchain morphologies, i.e., packing order and distance, were achieved
through altering the regioregularity, size of side-chains, and backbone alterations. It
was noted that the polymers switched between either dominant interchain coupling or
intrachain coupling based on their planarity and packing distance.
David A. Vanden Bout is a Professor in the Department of Chemistry. His research is in
the area of organic materials for electronic applications. He received his Ph.D. from the
University of Texas and was a National Science Foundation postdoctoral fellow at the
University of Minnesota. He came back to UT-Austin in 1997 and has won a number of awards
for his research including an Alfred P. Sloan Research Fellowship, Research Corporation
Cottrell Scholar Award, and a NSF CAREER Award. His innovative teaching has been
recognized with a CNS Teaching Excellence Award, President's Associates Teaching
Excellence Award and a Regent's Outstanding Teaching Award. For the past three years
he has served as the Associate Dean for Undergraduate Education in the College of Natural
Sciences.
Research<http://vandenbout.cm.utexas.edu/research/Vanden_Bout_Group/Rese…
Light Refreshments will be served.