Inorganic impurity effect on the photoinduced hydrophilic conversion on ultrasmooth SrTiO3 and TiO2 single crystal surfaces

Masao Katayama; Takayuki Miyakawa; Takeo Ohsawa; Jun Kuwano; Hideomi Koinuma; Yuji Matsumoto

doi:10.1143/JJAP.46.L562

Inorganic impurity effect on the photoinduced hydrophilic conversion on ultrasmooth SrTiO₃ and TiO₂ single crystal surfaces

Masao Katayama, Takayuki Miyakawa, Takeo Ohsawa, Jun Kuwano, Hideomi Koinuma, Yuji Matsumoto

Research output: Contribution to journal › Article › peer-review

Abstract

We report the effect of inorganic impurities on the photoinduced hydrophilic conversion on ultrasmooth SrTiO₃ and TiO₂ single crystal surfaces. A water droplet became well spread over on a TiO ₂-terminated SrTiO₃(100) surface after UV irradiation, whereas it remained beaded on a SrO-terminated SrTiO₃(100) surfaces. ZnP and CuO impurities deposited onto a rutile TiO₂(110) surfaces were found to suppress the hydrophilic conversion with increasing amounts of ZnP and CuO. No hydrophilicity characteristic of TiO₂ was observed after UV irradiation at a nominal impurity thickness of only 5 Å, indicating that the surface-exposed atomic layer plays a crucial role in photoinduced hydrophilic conversion.

Original language	English
Pages (from-to)	L562-L564
Journal	Japanese Journal of Applied Physics, Part 2: Letters
Volume	46
Issue number	20-24
DOIs	https://doi.org/10.1143/JJAP.46.L562
Publication status	Published - 2007 Jun 15
Externally published	Yes

Keywords

Hydrophilic conversion
Rutile
SrTiO
TiO
Ultrasmooth surface

ASJC Scopus subject areas

Engineering(all)
Physics and Astronomy (miscellaneous)
Physics and Astronomy(all)

Access to Document

10.1143/JJAP.46.L562

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Inorganic impurity effect on the photoinduced hydrophilic conversion on ultrasmooth SrTiO₃ and TiO₂ single crystal surfaces. / Katayama, Masao; Miyakawa, Takayuki; Ohsawa, Takeo; Kuwano, Jun; Koinuma, Hideomi; Matsumoto, Yuji.

In: Japanese Journal of Applied Physics, Part 2: Letters, Vol. 46, No. 20-24, 15.06.2007, p. L562-L564.

Research output: Contribution to journal › Article › peer-review

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abstract = "We report the effect of inorganic impurities on the photoinduced hydrophilic conversion on ultrasmooth SrTiO3 and TiO2 single crystal surfaces. A water droplet became well spread over on a TiO 2-terminated SrTiO3(100) surface after UV irradiation, whereas it remained beaded on a SrO-terminated SrTiO3(100) surfaces. ZnP and CuO impurities deposited onto a rutile TiO2(110) surfaces were found to suppress the hydrophilic conversion with increasing amounts of ZnP and CuO. No hydrophilicity characteristic of TiO2 was observed after UV irradiation at a nominal impurity thickness of only 5 {\AA}, indicating that the surface-exposed atomic layer plays a crucial role in photoinduced hydrophilic conversion.",

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AU - Katayama, Masao

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AU - Koinuma, Hideomi

AU - Matsumoto, Yuji

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AB - We report the effect of inorganic impurities on the photoinduced hydrophilic conversion on ultrasmooth SrTiO3 and TiO2 single crystal surfaces. A water droplet became well spread over on a TiO 2-terminated SrTiO3(100) surface after UV irradiation, whereas it remained beaded on a SrO-terminated SrTiO3(100) surfaces. ZnP and CuO impurities deposited onto a rutile TiO2(110) surfaces were found to suppress the hydrophilic conversion with increasing amounts of ZnP and CuO. No hydrophilicity characteristic of TiO2 was observed after UV irradiation at a nominal impurity thickness of only 5 Å, indicating that the surface-exposed atomic layer plays a crucial role in photoinduced hydrophilic conversion.

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