TY - JOUR
T1 - Effect of microstructure on photoinduced hydrophilicity of transparent anatase thin films
AU - Katsumata, Ken Ichi
AU - Nakajima, Akira
AU - Yoshikawa, Hidemi
AU - Shiota, Tadashi
AU - Yoshida, Naoya
AU - Watanabe, Toshiya
AU - Kameshima, Yoshikazu
AU - Okada, Kiyoshi
N1 - Funding Information:
The authors are grateful to Mr. C.D. Madhusoodana for critical reading and editing of the manuscript. The authors are grateful to Professor Y. Matsuo of the Tokyo Institute of Technology for helpful discussion. The authors are grateful to Dr. Keisuke Saito in BRUKER AXS K.K. for the precise analysis of FWHM values by a high power X-ray diffraction. The authors are also grateful to Hitachi High-Technologies Corporation for the use of the field emission scanning electron microscope. The present research is supported in part by a grant for the 21st Century COE Program “Nanomaterial Frontier Cultivation for Industrial Collaboration” from the Ministry of Education, Culture, Sports, Science, and Technology of Japan.
PY - 2005/4/1
Y1 - 2005/4/1
N2 - In the current work, we demonstrate the effect of the microstructure of polycrystalline TiO2 thin films prepared by the sol-gel process on the film's photoinduced hydrophilicity. The TiO2 thin films were prepared with different microstructures but almost the same crystal phase, band gap, film thickness and surface roughness. These films were prepared from the same starting materials, and the surface microstructure was changed by vacuum ultraviolet (VUV) irradiation before firing. The VUV-treated film possessed more heterogeneous microstructure (larger grains) than the non-VUV-treated film. The non-VUV-treated film exhibited a higher hydrophilicizing rate under UV irradiation than the VUV-treated film. Friction force microscopy (FFM) revealed that the relative area of the bright region, namely the hydrophilic region, increased in both films under UV irradiation. However, this contrast change is more homogeneous and remarkable in the non-VUV-treated film than in the VUV-treated film.
AB - In the current work, we demonstrate the effect of the microstructure of polycrystalline TiO2 thin films prepared by the sol-gel process on the film's photoinduced hydrophilicity. The TiO2 thin films were prepared with different microstructures but almost the same crystal phase, band gap, film thickness and surface roughness. These films were prepared from the same starting materials, and the surface microstructure was changed by vacuum ultraviolet (VUV) irradiation before firing. The VUV-treated film possessed more heterogeneous microstructure (larger grains) than the non-VUV-treated film. The non-VUV-treated film exhibited a higher hydrophilicizing rate under UV irradiation than the VUV-treated film. Friction force microscopy (FFM) revealed that the relative area of the bright region, namely the hydrophilic region, increased in both films under UV irradiation. However, this contrast change is more homogeneous and remarkable in the non-VUV-treated film than in the VUV-treated film.
KW - Polycrystalline thin film
KW - Surface structure
KW - Titanium oxide
KW - Wetting
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U2 - 10.1016/j.susc.2005.01.035
DO - 10.1016/j.susc.2005.01.035
M3 - Article
AN - SCOPUS:14944382917
SN - 0039-6028
VL - 579
SP - 123
EP - 130
JO - Surface Science
JF - Surface Science
IS - 2-3
ER -