TiO2 layers on Ti-Au alloy formed by two-step thermal oxidation and their photocatalytic activity in visible-light

Takatoshi Ueda; Shota Sado; Kyosuke Ueda; Takayuki Narushima

doi:10.1016/j.matlet.2016.08.066

TiO₂ layers on Ti-Au alloy formed by two-step thermal oxidation and their photocatalytic activity in visible-light

Takatoshi Ueda, Shota Sado, Kyosuke Ueda, Takayuki Narushima

ENG - Materials Processing

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

5 Citations (Scopus)

Abstract

Titania (TiO₂) layers consisting of anatase and rutile phases were formed on Ti-4at%Au alloy surface, using a two-step thermal oxidation method of carburization followed by air oxidation. Au from the alloy was found in the formed TiO₂ layer as metallic Au nanoparticles with diameter <10 nm and dissolved Au³⁺. The visible-light photocatalytic activity of the TiO₂ layer was evaluated by the degradation of stearic acid coating upon irradiation. Marked degradation of stearic acid was observed through the measured decrease in the water contact angle. Possible mechanisms of the visible-light photocatalytic activity are discussed.

Original language	English
Pages (from-to)	290-294
Number of pages	5
Journal	Materials Letters
Volume	185
DOIs	https://doi.org/10.1016/j.matlet.2016.08.066
Publication status	Published - 2016 Dec 15

Keywords

Anatase
Photocatalytic activity
Thermal oxidation
Ti-Au alloy
Titania
Water contact angle

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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title = "TiO2 layers on Ti-Au alloy formed by two-step thermal oxidation and their photocatalytic activity in visible-light",

abstract = "Titania (TiO2) layers consisting of anatase and rutile phases were formed on Ti-4at%Au alloy surface, using a two-step thermal oxidation method of carburization followed by air oxidation. Au from the alloy was found in the formed TiO2 layer as metallic Au nanoparticles with diameter <10 nm and dissolved Au3+. The visible-light photocatalytic activity of the TiO2 layer was evaluated by the degradation of stearic acid coating upon irradiation. Marked degradation of stearic acid was observed through the measured decrease in the water contact angle. Possible mechanisms of the visible-light photocatalytic activity are discussed.",

keywords = "Anatase, Photocatalytic activity, Thermal oxidation, Ti-Au alloy, Titania, Water contact angle",

author = "Takatoshi Ueda and Shota Sado and Kyosuke Ueda and Takayuki Narushima",

note = "Funding Information: The authors would like to thank Dr. T. Miyazaki, Dr. K. Kobayashi, Ms. K. Omura and Ms. Y. Nakano of Tohoku University for the TEM, SEM, XPS and ICP-MS analyses, respectively. This study was partially supported by Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology ( MEXT ), Japan (Nos. 25249094 and 26709049 ) and “Interdepartmental Doctoral Degree Program for Multi-dimensional Materials Science Leaders” of Tohoku University, adopted as “Program for Leading Graduate Schools, MEXT.” Publisher Copyright: {\textcopyright} 2016 Elsevier B.V.",

year = "2016",

month = dec,

day = "15",

doi = "10.1016/j.matlet.2016.08.066",

language = "English",

volume = "185",

pages = "290--294",

journal = "Materials Letters",

issn = "0167-577X",

publisher = "Elsevier",

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TY - JOUR

T1 - TiO2 layers on Ti-Au alloy formed by two-step thermal oxidation and their photocatalytic activity in visible-light

AU - Ueda, Takatoshi

AU - Sado, Shota

AU - Ueda, Kyosuke

AU - Narushima, Takayuki

N1 - Funding Information: The authors would like to thank Dr. T. Miyazaki, Dr. K. Kobayashi, Ms. K. Omura and Ms. Y. Nakano of Tohoku University for the TEM, SEM, XPS and ICP-MS analyses, respectively. This study was partially supported by Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology ( MEXT ), Japan (Nos. 25249094 and 26709049 ) and “Interdepartmental Doctoral Degree Program for Multi-dimensional Materials Science Leaders” of Tohoku University, adopted as “Program for Leading Graduate Schools, MEXT.” Publisher Copyright: © 2016 Elsevier B.V.

PY - 2016/12/15

Y1 - 2016/12/15

N2 - Titania (TiO2) layers consisting of anatase and rutile phases were formed on Ti-4at%Au alloy surface, using a two-step thermal oxidation method of carburization followed by air oxidation. Au from the alloy was found in the formed TiO2 layer as metallic Au nanoparticles with diameter <10 nm and dissolved Au3+. The visible-light photocatalytic activity of the TiO2 layer was evaluated by the degradation of stearic acid coating upon irradiation. Marked degradation of stearic acid was observed through the measured decrease in the water contact angle. Possible mechanisms of the visible-light photocatalytic activity are discussed.

AB - Titania (TiO2) layers consisting of anatase and rutile phases were formed on Ti-4at%Au alloy surface, using a two-step thermal oxidation method of carburization followed by air oxidation. Au from the alloy was found in the formed TiO2 layer as metallic Au nanoparticles with diameter <10 nm and dissolved Au3+. The visible-light photocatalytic activity of the TiO2 layer was evaluated by the degradation of stearic acid coating upon irradiation. Marked degradation of stearic acid was observed through the measured decrease in the water contact angle. Possible mechanisms of the visible-light photocatalytic activity are discussed.

KW - Anatase

KW - Photocatalytic activity

KW - Thermal oxidation

KW - Ti-Au alloy

KW - Titania

KW - Water contact angle

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