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DTSTAMP:20250929T031400Z
DESCRIPTION:Zoom link: https://mcgill.zoom.us/j/94644893170\n\nAbstract:\n
 \nPlasmonic materials are highly promising photoredox catalysts for drivin
 g energetically unfavorable chemical reactions with light\, due to their l
 arge optical cross sections and ability to generate a number of hot holes 
 and electrons. However\, the efficiencies of most plasmon-driven processes
  are quite low\, likely due to the lack of mechanistic understanding of th
 e underlying physical processes. Plasmons can concentrate electromagnetic 
 fields\, can generate highly energetic electrons and holes\, and can heat 
 up local environments. An understanding of the energy partitioning into ea
 ch of these processes is crucial to the design of plasmonic photocatalysts
  which are optimized for chemical selectivity. Here I’ll discuss our devel
 opment of ultrafast surface-enhanced Raman spectroscopy (SERS) to probe th
 e behavior of molecules in plasmonic hot spots. By probing on the relevant
  timescales\, we are able to uncover how and when the plasmon energy is co
 nverted into hot carriers\, molecular heating\, or resonant energy transfe
 r. We use a new form of ultrafast Raman thermometry to probe energy transf
 erred into adsorbed molecules as heat\, showing that the plasmon-induced h
 eating contribution to catalysis is negligible. Additionally\, we probe ho
 t carrier transfer events and use SERS substrates with tunable electromagn
 etic field enhancements to examine the effects of local fields on chemical
  reactivity. These results quantitatively determine the energy partitionin
 g of plasmon decay\, and highlight the unique ability of these plasmonic m
 aterials to drive energetically unfavorable chemical reactions.\n\nBio:\n
 \nRenee R. Frontiera is a McKnight Land-Grant associate professor of Chemi
 stry at the University of Minnesota. Her research group uses Raman spectro
 scopic techniques to examine chemical composition and chemical reaction dy
 namics on nanometer length scales and ultrafast time scales. She received 
 her Ph. D. in 2009 from the University of California – Berkeley\, under th
 e advisement of Richard A. Mathies. Her postdoctoral research at Northwest
 ern University was under the supervision of Richard P. Van Duyne. Her rese
 arch group at the University of Minnesota was founded in 2013\, and she is
  the recent recipient of an NSF CAREER award\, a DOE Early Career award\, 
 and an NIH Maximizing Investigators’ Research Award (MIRA). She was named 
 one of Chemical & Engineering News’s “Talented 12”\, and has won a Journal
  of Physical Chemistry Lectureship and a Camille Dreyfus Teacher-Scholar a
 ward.\n
DTSTART:20200915T170000Z
DTEND:20200915T183000Z
SUMMARY:Chemical Society Seminar: Renee Frontiera  - Spectroscopic Probes o
 f Plasmon-Driven Chemical Reactions
URL:/chemistry/channels/event/chemical-society-seminar
 -renee-frontiera-spectroscopic-probes-plasmon-driven-chemical-reactions-32
 3998
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