Hot-Injection Synthesis of Bactericidal Sn-Doped TiO2 Nanospheres for Visible-Light Photocatalysis
Sn-doped (5, 10, 15, and 20 at.%) TiO2 nanospheres have been synthesized by hot-injection method and the optimum doping level for visible light photocatalyis is found to be 15%. The energy dispersive X-ray spectrum confirms the presence of Sn and its composition in the prepared nanospheres. The X-ray diffraction pattern reveals Sn-doping of TiO2 which is in rutile phase. Replacement of Ti4+ by Sn4+ results in enlargement of unit cell volume. The doped oxide exhibits blue as well as green emission due to oxygen vacancies. The specific conductance and capacitance of 15% Sn-doped TiO2 are larger than those of pristine TiO2. The synthesized nanosphere is also found to act as a bactericide; it kills E. coli cells effectively in the absence of direct illumination.
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Document Type: Research Article
Publication date: December 1, 2012
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