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SUMMARY:Using Raman Spectroscopy to Probe the Vibrational and Electronic Pr
 operties of Atomically Precise Nanostructures:  From Cadmium Selenide Quan
 tum Dots to Graphene
LOCATION:Chemistry A101
TZID:America/Denver
DTSTART:20192101T000000
UID:2026-04-16-11-13-20@natsci.colostate.edu
DTSTAMP:20260416T111320
Description:About the Seminar:\n\nThe Crowther Group uses micro-Raman spect
 roscopy to investigate the vibrational and electronic properties of a vari
 ety of nanostructures.  Semiconducting nanocrystals occupy a size regime 
 between the molecular and bulk limits.  Nanocrystal vibrational structure
  can be described using either a molecular \"bottom-up\" quantum chemical 
 approach or via a \"top-down\" phonon confinement model that truncates bul
 k phonons at the nanocrystal boundaries.  We use temperature-dependent Ra
 man spectroscopy to identify the size transition from molecular vibrations
  to confined phonons in a series of atomically precise cadmium selenide qu
 antum dots of tetrahedral shape with edges that range from 1.7 nm to 2.6 n
 m in length.  Surprisingly\, as little as one unit cell in the nanocrysta
 l is sufficient to successfully apply a phonon confinement model.  In a s
 econd project\, we use Raman spectroscopy to measure how solvation affects
  the surface adsorption and electron-transfer dynamics between graphene an
 d iodine. Understanding these solvation effects is a necessary prerequisit
 e for many graphene applications.  Solution-phase isotherms demonstrate t
 hat solvent polarity drives surface adsorption and that the subsequent ele
 ctron transfer from graphene to iodine is strongly influenced by solvent-I
 2 complexes.  \n\n&nbsp\;\n\nAbout the Speaker:\n\nAndrew Crowther earned
  his B.A in Chemistry from Washington University in St. Louis in 2002 and 
 his Ph.D. in Chemistry under the supervision of Professor F. Fleming Crim 
 at the University of Wisconsin-Madison in 2008. He then completed a Mirzay
 an Science and Technology Policy Fellowship at the Board on Chemical Scien
 ces and Technology at the National Research Council\, followed by postdoct
 oral research with Prof. Louis Brus at Columbia University.  Professor Cr
 owther has been an Assistant Professor of Chemistry at Barnard College in 
 New York City since 2012\, where his research group uses Raman spectroscop
 y to investigate the fundamental vibrational and electronic properties of 
 nanomaterials. His research has been supported by the American Chemical So
 ciety Petroleum Research Fund and the National Science Foundation. 4:00 pm
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