Pacific Rim Symposium on Surfaces, Coatings and Interfaces (PacSurf 2014)
    Nanomaterials Wednesday Sessions
       Session NM-WeP

Paper NM-WeP22
Defect Induced Visible Light Photocatalytic Activity of SnO2 Nanoparticles

Wednesday, December 10, 2014, 4:00 pm, Room Mauka

Session: Nanomaterials Poster Session
Presenter: Sajid A. Ansari, Yeungnam University, South Korea
Authors: S.A. Ansari, Yeungnam University, South Korea
M.M. Khan, Yeungnam University, South Korea
M.O. Ansari, Yeungnam University, South Korea
Cho, Yeungnam University, South Korea
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We report the defect-induced band gap narrowing of pure SnO2 nanoparticles (p-SnO2) using an electrochemically active biofilm. The proposed approach is biogenic, simple and green. The systematic characterization results of the modified SnO2 nanoparticles (m-SnO2) revealed EAB-mediated defects in p-SnO2. m-SnO2 nanoparticles in visible light showed the enhanced photocatalytic degradation of p-nitrophenol and methylene blue compared to p-SnO2 nanoparticles. Photoelectrochemical studies, such as electrochemical impedance spectroscopy and linear scan voltammetry, also revealed a significant increase in the visible light response of m-SnO2 compared to p-SnO2 nanoparticles. The enhanced activities of m-SnO2 in visible light was attributed to the high separation efficiency of the photoinduced electron-hole pairs due to surface defects created by EAB, resulting in band gap narrowing of the m-SnO2 nanoparticles.