(DURIP) An Ultrafast Transient Absorption Spectrometer
Abstract
Jillian L. Dempsey, an associate professor in the Department of Chemistry at the University of North Carolina at Chapel Hill (UNC-CH), seeks funding from the Defense University Research Instrumentation Program (DURIP) to acquire an ultrafast transient absorption (TA) spectrometer for femtosecond pump–probe spectroscopy. The transient absorption spectrometer will be dedicated primarily to studying electron transfer dynamics at nanocrystal interfaces that occur on the picosecond-to-microsecond timescales. Detection in the UV-visible and the near-infrared regimes will allow both excitonic and charge carrier dynamics to be resolved, as well as the redoxactivity of molecular charge transfer partners. This instrumentation is critical to advance the PI’s research project sponsored by the Air Force Office of Scientific Research (AFOSR). Over the past three years, a Young Investigator Award has supported study of nanomaterial surfaces, with aims of 1) gaining molecular level insight to reactivity at the surfaces, 2) elucidating the microscopic nature of charge carrier trap states, 3) understanding how surfaces change upon addition of charge carriers, and 4) determining how these controlled changes to the nanocrystal surface impact charge carrier dynamics. Work proposed to AFOSR seeks to determine how the identity, population, and reactivity of charge carrier trap states in semiconductor nanocrystals impacts interfacial charge transfer and to demonstrate how molecular-level control over nanocrystal surface composition can be used to control electron transfer dynamics and pathways.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Aug 12, 2021
- Source ID
- FA95502010050
Entities
People
- Jillian Lee Dempsey
Organizations
- Air Force Office of Scientific Research
- United States Air Force
- University of North Carolina at Chapel Hill