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Chemistry Seminar Program
Physical Chemistry Seminar Tuesday, May 13th Professor Gregory Scholes "Designing and Controlling the Optical Properties of Nanoscale Systems"  4:15pm - 5:15pm Braun Lecture Hall S.G.Mudd Chemistry Building Stanford University This seminar is free and open to the public. All Stanford University Chemistry students are encouraged to attend this special event. About the seminar: There are several applications that take advantage of the light- emitting properties of nanoscale systems, with diodes and lasers, single-photon sources, and bio-labels being notable examples. A growing and very important area of application for these same materials is in the field of renewable energy and the harvesting of solar photons. Nanoscale excitons are the transient electronic excitations formed in nanoscale systems when light is absorbed. These species live for at most nanoseconds before they disintegrate to thermal energy, and during their brief lifetime they evolve in highly complicated ways. A challenge for researchers is control and direct their evolution. In that way we will be able to optimize both the harvesting of light and its conversion into electrical energy. Examination of this problem raises some fascinating questions and experimental observations that will be described in this talk. For example, are simple models for excitons sufficient? Why are nanoscale excitons so stable? Can we engineer new wavefunctions by growing “supramolecular” nanorods comprised of two semiconductor quantum dots? How does charge transfer occur in nanoscale systems? Can exciton relaxation and spin dynamics be controlled using chemical synthesis? About : Dr. Scholes obtained both his Ph.D. (1994) from the University of Melbourne. He undertook postdoctoral studies at Imperial College in London from 19951997 as a Ramsay Memorial Research Fellow. During the period 19972000 he pursued further postdoctoral studies at the University of California, Berkeley. He subsequently took a faculty position at the University of Toronto, in the Department of Chemistry (2000) and was promoted to Associate Professor in 2005. Recent awards honoring his research achievements include the 2007 Royal Society of Canada Rutherford Medal in Chemistry, a 2007 NSERC Steacie Fellowship, the 2006 Canadian Society of Chemistry Keith Laidler Award, and an Alfred P. Sloan Fellowship (20052006). Dr. Scholes’ present research focused on understanding the principles deciding electronic structure, optical properties, and reactions of nanoscale systems. Questions Please contact Patricia Dwyer at 650-723-4770.
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