David A VandenboutProfessor
Department of Chemistry
Ray-Pharr Excellence Fund for the College of Natural SciencesSpectroscopy/Microscopy Of Heterogeneous Materialsdvandenbout@austin.utexas.edu
The University of Texas at Austin
Department of Chemistry, College of Natural Sciences
1 University Station A5300
Austin, TX 78712
Ph.D., Chemical Physics, University of Texas at Austin (1995)
B.S., Chemistry, Duke University (1990)
NSF Postdoctoral Fellow, University of Minnesota (1995-97)
Spectroscopy/Microscopy Of Heterogeneous Materials
Research in the Vanden Bout group is focused on spectroscopically probing condensed phase systems that are inherently heterogeneous in nature. The difficulty in studying these non-ideal heterogeneous materials is that they contain a wide variety of environments. Bulk spectroscopic methods average together multitudes of these different environments, thereby masking the source of particular features and complicating the interpretation of experimental results. Two recent experimental developments have made direct probing of heterogeneous systems possible: near-field scanning optical microscopy (NSOM) and single molecule spectroscopy (SMS).
Our NSOM studies are devoted to investigating the electronic and optical properties of organic thin film materials. In these materials, it is critical to understand the role of various charge and energy carriers in the system. However, vapor-deposited and spin cast thin films have widely varied morphologies that strongly affect their properties. Our research is eliminating these problems by directly probing thin films with NSOM. A wide array of techniques can be used for imaging including transmission, fluorescence, polarization, and time-resolved spectroscopies. We are currently studying a number of materials including polyfluorene, sexi-thiophene, poly thiophene and others.
The second half of our work deals with dynamics near the glass transition in small molecule liquids and polymers. We are developing a microscopic picture of molecular motion near the glass transition by following individual probe molecules dissolved in a glass forming material. Our first experiments are probing highly dilute dye molecules in ortho-terphenyl. Future work will study dynamics in other heterogeneous systems including micelles, ultra-thin polymer films, and phase separated polymer films.
“The Effects of Aggregation on Electronic and Optical Properties of Oligothiophene Particles” D. Ostrowski, L. Lytwak, M. Meija, K. Stevenson, B. Holliday, D. A. Vanden Bout, ACS Nano, 6(6), 5507-5513 (2012).
“Utilizing Redox-Chemistry to Elucidate the Nature of Exciton Transitions in Supramolecular Dye Nanotubes”, D. M. Eisele, C. W. Cone, E. A. Bloemsma, S. M. Vlaming, R. J. Silbey, M. G. Bawendi, J. Knoester, J. P. Rabe, and D. A. Vanden Bout, Nature Chemistry, doi:10.1038/nchem.1380 (2012).
“Conformation and energy transfer in single conjugated polymers” Joshua C. Bolinger, Matthew C. Traub, Johanna Brazard, Takuji Adachi, Paul F. Barbara, and David A. Vanden Bout, Acc. Chem. Res., online.
Self-Assembly of Highly Ordered Conjugated Polymer Aggregates with Long-Range Energy Transfer, Jan Vogelsang, Takuji Adachi, Johanna Brazard, David A. Vanden Bout, Paul F. Barbara, Nature Materials, 10, 942–946 (2011).
Scanning Photocurrent and Fluorescence Microscopy, D. P. Ostrowski, M. S. Glaz,B. W. Goodfellow, V. A. Akhavan,M. G. Panthani, B. A. Korgel,D. A. Vanden Bout, Small, 6, 2832-2836 (2010).
“Uniform exciton fluorescence from individual self-assembled molecular nanotubes immobilized on solid substrates” Eisele, D.M.; Knoester, J.; Kirstein, S.; Rabe, J.P.; Vanden Bout, D.A. Nature Nanotechnology, 4(10), 658-663 (2009).
- Research Corporation Cottrell Scholar, 2000
- Research Corporation Research Innovation Award, 1999
- Alfred P. Sloan Research Fellow, 1999
- Camille & Henry Dreyfus Foundation New Faculty Award, 1997