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Visible-light photocatalytic activity of N/SiO2-TiO2 thin films on glass
Advances in Natural Sciences: Nanoscience and Nanotechnology Số 1, năm 2010 (Tập 1, trang -)
ISSN: 20436262
ISSN: 20436262
DOI: 10.1088/2043-6254/1/1/015004
Tài liệu thuộc danh mục: Scopus
Article
English
Từ khóa: Absorption spectroscopy; Atomic force microscopy; Catalysts; Doping (additives); Glass; High resolution transmission electron microscopy; Light; Nanocrystals; Oxide minerals; Photocatalysts; Scanning electron microscopy; Silica; Silicon; Silicon alloys; Sol-gel process; Sol-gels; Substrates; Thin films; Titanium alloys; Titanium dioxide; Titanium metallography; Ultraviolet spectroscopy; Uranium metallography; Vanadium metallography; Glass substrates; Nanocrystallines; Optimal concentration; UV-Vis absorption spectroscopy; Visible light; Visible light photocatalytic activity; Visible light region; Visible-light photocatalysts; Photocatalytic activity
Tóm tắt tiếng anh
Nanocrystalline N-doped SiO2/TiO2 visible-light photocatalyst thin films were synthesized using the sol-gel method on glass substrates. The synthesized catalysts were then characterized using several analytical techniques like x-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), Atomic Force Microscopy (AFM), and UV-vis absorption spectroscopy (UV-vis). The experimental results revealed that the maximum optical response of the synthesized SiO2/TiO 2 thin films shifted from the ultraviolet (UV) to the visible-light region (γ > 420 nm). The photocatalytic activity of N-doped SiO 2-TiO2 photocatalyst was considerably higher than that of SiO2-TiO2, and this result was obtained with an optimal concentration of 40 mol% of N. The enhanced photocatalytic activity was attributed to the increasing surface area and forming more hydroxyl groups in the doped catalyst. © 2010 Vietnam Academy of Science & Technology.