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TiO2-SiO2 nanoparticles for suppressing photocatalytic activities and improving hydrophilicity

Title
TiO2-SiO2 nanoparticles for suppressing photocatalytic activities and improving hydrophilicity
Author
구상만
Keywords
Titanium dioxide; SiO2 shell; Photocatalytic activity; Hydrophilicity
Issue Date
2012-11
Publisher
KOREAN ASSOC CRYSTAL GROWTH, INC
Citation
Journal of Ceramic Processing Research, Nov 2012, P.S300-S303
Abstract
Titanium dioxide (TiO2) has attracted significant attention because of its photocatalytic and UV absorbance properties. However, despite the good UV-shielding property of TiO2, it is not suitable for use in outdoor UV-shielding protective films because of its strong photocatalytic behavior when absorbing UV radiation. Here, we describe a TiO2@SiO2 core shell structure with uniform and thin SiO2 layer; the SiO2 shell suppresses TiO2 photocatalytic activity and improves the wettability of the TiO2. TiO2@SiO2 nanoparticles were characterized by TEM, FT-IR, XPS, and VB-XPS. A uniform, thin SiO2 shell suppressed the photocatalytic activity of the TiO2 core by broadening the band gap because of the existence of Ti-O-Si chemical bonds at the interface of TiO2 and SiO2. Moreover, the increase in wettability of the TiO2@SiO2-coated films observed was a permanent property and did not require UV activation.
URI
http://www.scopus.com/record/display.uri?eid=2-s2.0-84874218785&origin=inward&txGid=2c9bbd381590edb28efb7a99adc4a0dehttp://hdl.handle.net/20.500.11754/43006
ISSN
1229-9162
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > CHEMICAL ENGINEERING(화학공학과) > Articles
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