Anat Lipovsky, Luba levitski, Zeev Tzitrinovich, Aharon Gedanken and Rachel Lubart The Different Behavior of Rutile and Anatase Nanoparticles in Forming Oxy Radicals Upon Illumination with Visible Light: An EPR Study Photochemistry and Photobiology 88
In view of the wide use of TiO2 for biologic applications, it is important to study the reactivity of TiO2 nanoparticles in water suspensions and under visible light illumination. The rutile and anatase TiO2 nanoparticles phases were found to generate reactive oxygen species in aqueous suspensions. Both superoxide anions and hydroxyl radicals were detected in NP suspensions. TiO2-rutile also responded to visible light irradiation, and elevated levels of superoxide and singlet oxygen were observed.
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