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SUMMARY:Nanoscale imaging of catalytic activity in semiconductor nanostruct
 ures using super-resolution fluorescence microscopy
LOCATION:Chemistry A101
TZID:America/Denver
DTSTART:20191001T000000
UID:2026-04-18-23-13-26@natsci.colostate.edu
DTSTAMP:20260418T231326
Description:About the Seminar\nDefect engineering is a strategy that has be
 en widely used to design active semiconductor photocatalysts. However\, un
 derstanding the role of defects\, such as oxygen vacancies\, in controllin
 g photocatalytic activity remains a challenge. In this talk I will discuss
  the use of chemically triggered fluorogenic probes to study the spatial d
 istribution of active regions in individual tungsten oxide nanowires using
  super-resolution fluorescence microscopy. Through quantitative\, coordina
 te-based colocalization of different probe molecules activated by the same
  nanowires\, we demonstrate that the nanoscale regions most active for the
  photocatalytic generation of hydroxyl radicals also possess a greater con
 centration of oxygen vacancies. Chemical modifications to remove or block 
 access to surface oxygen vacancies\, supported by calculations of binding 
 energies of adsorbates to different surface sites on tungsten oxide\, show
  how these defects control catalytic activity at both the ensemble and sin
 gle-particle level. These findings reveal that oxygen vacancies activate s
 urface-adsorbed water molecules towards oxidation by using photogenerated 
 holes to produce hydroxyl radicals\, a critical intermediate in the photoc
 atalytic oxidation of water\, methane\, and environmental pollutants.\nAbo
 ut the Speaker\nBryce Sadtler is a native of Indiana and graduated from Pu
 rdue University with a B.S degree in Chemistry in 2002. He conducted his g
 raduate studies at the University of California\, Berkeley under the guida
 nce of Paul Alivisatos\, where he developed chemical transformations in co
 lloidal semiconductor nanocrystals. He received a Ph.D. in Physical Chemis
 try in 2009. He was then a Beckman Institute Postdoctoral Fellow at the Ca
 lifornia Institute of Technology\, where he worked with Nathan Lewis and H
 arry Atwater to develop light-driven growth processes in inorganic nanostr
 uctures. Bryce joined the Department of Chemistry at Washington University
  in St. Louis in the fall of 2014. His research interests include solid-st
 ate chemistry and light–matter interactions in nanoscale materials for a
 pplications in solar energy conversion\, catalysis\, and photonics. As an
  assistant professor\, he has received a NSF Career award (2018)\, an ACS 
 PRF Doctoral New Investigator Award (2017)\, and was named an Emerging Inv
 estigator by the Journal of Materials Chemistry (2017).  4:00 pm
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