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Photocatalytic properties of visible-light enabling layered titanium oxide/tin indium oxide films

Paper ID Volume ID Publish Year Pages File Format Full-Text
48246 46497 2008 8 PDF Available
Title
Photocatalytic properties of visible-light enabling layered titanium oxide/tin indium oxide films
Abstract

Visible-light enabling titanium oxide/tin indium oxide (TiO2/ITO) thin films deposited on unheated glass slides with prolonged deposition duration were investigated in this study. Structural properties characterized by X-ray diffraction (XRD), Raman spectra and scanning electron microscopy (SEM) showed typical polycrystalline structure with primary anatase phase along with elongated pyramid-like grains lying on the film surface and densely packed columnar structure from cross-sectional profile. The XRD preferential peak of (2 1 1) and the Raman peak intensity at ∼640 cm−1 dramatically increased without noticeable broadening and shift as the deposition time was prolonged beyond 2 h. This implies that more perfectly crystalline structure, less internal stress, and comparatively larger grains were obtained by this technique. The Ti2p3/2 and O1s XPS peaks shifted toward higher binding energy suggest that the local chemical state was influenced by the prolonged deposition duration in the film, which resulted in red shift of absorption threshold into visible-light region. Under ultra-violet (UV) and visible-light illumination, the visible-light enabling film exhibited the best photocatalytic activity on MB degradation with the rate-constant of about 0.231 h−1. Hydrophilic conversion rate was estimated to be 8.14 × 10−3 deg−1 min−1 and long-term UV-induced hydrophilicity of ∼10° in the dark storage up to 72 h was observed. In addition to its inherent characteristics of the layered TiO2/ITO structure on hole/electron separation, all these could be attributed to more perfectly formed crystalline structure, densely packed columnar crystals and the surface roughness along with its enlarged surface area.

Keywords
Titanium oxide/tin indium oxide (TiO2/ITO) films; Visible-light; Hydrophilicity
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Photocatalytic properties of visible-light enabling layered titanium oxide/tin indium oxide films
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 80, Issues 3–4, 8 May 2008, Pages 313–320
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us