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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 30, Number 5
BKCSDE 30(5)
May 20, 2009 

Change in Water Contact Angle of Carbon Contaminated TiO2 Surfaces by High-energy Electron Beam
Kwang Dae Kim, Wei Sheng Tai, Young Dok Kim*, Sang Jin Cho, In Seob Bae, Jin Hyo Boo, Byung Cheol Lee, Ki Ho Yang, Ok Kyung Park
Electron beam, TiO2, Water contact angle
We studied change in water contact angle on TiO2 surfaces upon high-energy electron-beam treatment. Depending on conditions of e-beam exposures, surface OH-content could be increased or decreased. In contrast, water contact angle continuously decreased with increasing e-beam exposure and energy, i.e. change in the water contact angle cannot be rationalized in terms of the overall change in the surfacestructure of carbon-contaminated TiO2. In the C 1s spectra, we found that the C-O and C=O contents gradually increased with increasing e-beam energy, suggesting that the change in the surface structure of carbon layers can be important for understanding of the wettability change. Our results imply that the degree of oxidation of carbon impurity layers on oxide surfaces should be considered, in order to fully understand the change in the oxide surface wettability.
1067 - 1070
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