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UID:Baylor_CMS_Event-82730
DTSTAMP:20260614T064145Z
SUMMARY:2013 Spring Graduate Colloquium Series - Indra-Mani Ghimire:Oxygen Vacancies Inhibiting Photoactivity on TiO2 
DESCRIPTION;ENCODING=QUOTED-PRINTABLE:In a recent scanning tunneling microscopy (STM) study, out of two active=0D=0A=
sites on trimethyl-acetic-acid-dosed Ti02, the reaction readily occurs at=0D=0A=
regular Ti sites but is completely inhibited at oxygen vacancy (Vo) defects.=0D=0A=
This inertness at Vo is due to excess unpaired electrons there since they=0D=0A=
promptly recombine with incoming photoexcited holes. It is not due to=0D=0A=
the less active adsorption coefficient or electron transfer from Vo (as=0D=0A=
shown by density functional theory and electron energy loss=0D=0A=
spectroscopy). This effective “screening” is site specific and spatially=0D=0A=
confined, affecting most on Vo sites and less so at adjacent Ti sites.=0D=0A=
(Based on: Z.-T. Wang, et al., Phys. Rev. Lett. 109 266103 (2012))
LOCATION:Baylor Sciences Building, Room E.125 Reception at 3:15 p.m. in BSB D.311 Conference Room
DTSTART;TZID=US_Central:20130301T153500
DTEND;TZID=US_Central:20130301T170000
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