Abstract
Photoinduced phenomena are of general interest for new materials. Recently,photoinduced molecular desorption of oxygen has been reported in carbonnanotubes. Here we present, using thermopower measurements, that carbonnanotubes when exposed simultaneously to UV light and oxygen exhibitphotoinduced oxidation of the nanotubes. At least two plausible mechanisms forthe experimentally observed photoinduced oxidation are proposed: (i) a lowerenergy barrier for the adsorption of photo-generated singlet oxygen, or (ii) due tothe presence of defects in carbon nanotubes that may facilitate the formation oflocally electron-deficient and electron-rich regions on the nanotubes whichfacilitate the adsorption of oxygen molecules on the nanotubes.
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