Defects in silica and passivating them

Vignesh Gowrishankar vigneshg at
Tue Feb 27 12:47:04 PST 2007

Hi All,

After seeing unexpected results in an experiment, we seem to think that the 
(mesoporous) silica we used had a lot of defects, perhaps mid-gap. Do any 
of you have any experience / knowledge of such defects, and how to possibly 
passivate them? I have found that silica does have photoluminescence at 2.3 
eV, 3.1 eV and 4.2 eV or so, which somewhat confirms our belief. Does 
anybody have more information?


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