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SUMMARY:2013 Spring Graduate Colloquium Series:  Indra-Mani Ghimire
DESCRIPTION;ENCODING=QUOTED-PRINTABLE:Indra-Mani Ghimire=0D=0A=
Oxygen Vacancies Inhibiting Photoactivity on TiO2=0D=0A=
In a recent scanning tunneling microscopy (STM) study, out of two active sites on trimethyl-acetic-acid-dosed Ti02, the reaction readily occurs at 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 promptly recombine with incoming photoexcited holes. It is not due to=0D=0A=
the less active adsorption coefficient or electron transfer from Vo (as shown by density functional theory and electron energy loss=0D=0A=
spectroscopy). This effective “screening” is site specific and spatially 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))=0D=0A=
=0D=0A=
For more information, please contact: Dr. Linda Olafsen 254-710-2541
LOCATION:Baylor Sciences Building, Room E.125
DTSTART;TZID=US_Central:20130301T153500
DTEND;TZID=US_Central:20130301T170000
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