Synthesis of oxygen-deficient blue titanium oxide by discharge plasma generated in aqueous ammonia solution

Yoshiteru Mizukoshi; Megumi Ohwada; Satoshi Seino; Hiroshi Horibe; Yoshimi Nishimura; Chiaki Terashima

doi:10.1016/j.apsusc.2019.05.353

Synthesis of oxygen-deficient blue titanium oxide by discharge plasma generated in aqueous ammonia solution

Yoshiteru Mizukoshi, Megumi Ohwada, Satoshi Seino, Hiroshi Horibe, Yoshimi Nishimura, Chiaki Terashima

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

Abstract

When discharge plasma was generated in an aqueous ammonia solution containing titanium dioxide (TiO₂) powder, blue TiO₂ was obtained. The blue TiO₂ contained oxygen defects and Ti³⁺ formed by the plasma treatment; i.e., reducing species such as hydrogen radicals generated in situ during ammonia decomposition by plasma were considered to reduce TiO₂. No marked changes in the crystallographic structure and specific surface area of TiO₂ were observed after the plasma treatment, indicating that TiO₂ was not exposed to high temperature. In addition, the plasma-treated TiO₂ remained blue when exposed to air for several months. The photocatalytic activity of anatase TiO₂ under visible light irradiation was enhanced after plasma treatment. In contrast, the plasma-treated rutile TiO₂ showed inferior photocatalytic activity under visible light irradiation compared with that of the untreated rutile TiO₂.

Original language	English
Pages (from-to)	255-261
Number of pages	7
Journal	Applied Surface Science
Volume	489
DOIs	https://doi.org/10.1016/j.apsusc.2019.05.353
Publication status	Published - 2019 Sep 30

Keywords

Defects
Electron energy loss spectroscopy
Oxide
Photocatalyst
Raman spectroscopy

ASJC Scopus subject areas

Chemistry(all)
Condensed Matter Physics
Physics and Astronomy(all)
Surfaces and Interfaces
Surfaces, Coatings and Films

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@article{47f9d61c0e40467184affd8d162e8a79,

title = "Synthesis of oxygen-deficient blue titanium oxide by discharge plasma generated in aqueous ammonia solution",

abstract = "When discharge plasma was generated in an aqueous ammonia solution containing titanium dioxide (TiO2) powder, blue TiO2 was obtained. The blue TiO2 contained oxygen defects and Ti3+ formed by the plasma treatment; i.e., reducing species such as hydrogen radicals generated in situ during ammonia decomposition by plasma were considered to reduce TiO2. No marked changes in the crystallographic structure and specific surface area of TiO2 were observed after the plasma treatment, indicating that TiO2 was not exposed to high temperature. In addition, the plasma-treated TiO2 remained blue when exposed to air for several months. The photocatalytic activity of anatase TiO2 under visible light irradiation was enhanced after plasma treatment. In contrast, the plasma-treated rutile TiO2 showed inferior photocatalytic activity under visible light irradiation compared with that of the untreated rutile TiO2.",

keywords = "Defects, Electron energy loss spectroscopy, Oxide, Photocatalyst, Raman spectroscopy",

author = "Yoshiteru Mizukoshi and Megumi Ohwada and Satoshi Seino and Hiroshi Horibe and Yoshimi Nishimura and Chiaki Terashima",

year = "2019",

month = sep,

day = "30",

doi = "10.1016/j.apsusc.2019.05.353",

language = "English",

volume = "489",

pages = "255--261",

journal = "Applied Surface Science",

issn = "0169-4332",

publisher = "Elsevier",

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TY - JOUR

T1 - Synthesis of oxygen-deficient blue titanium oxide by discharge plasma generated in aqueous ammonia solution

AU - Mizukoshi, Yoshiteru

AU - Ohwada, Megumi

AU - Seino, Satoshi

AU - Horibe, Hiroshi

AU - Nishimura, Yoshimi

AU - Terashima, Chiaki

PY - 2019/9/30

Y1 - 2019/9/30

N2 - When discharge plasma was generated in an aqueous ammonia solution containing titanium dioxide (TiO2) powder, blue TiO2 was obtained. The blue TiO2 contained oxygen defects and Ti3+ formed by the plasma treatment; i.e., reducing species such as hydrogen radicals generated in situ during ammonia decomposition by plasma were considered to reduce TiO2. No marked changes in the crystallographic structure and specific surface area of TiO2 were observed after the plasma treatment, indicating that TiO2 was not exposed to high temperature. In addition, the plasma-treated TiO2 remained blue when exposed to air for several months. The photocatalytic activity of anatase TiO2 under visible light irradiation was enhanced after plasma treatment. In contrast, the plasma-treated rutile TiO2 showed inferior photocatalytic activity under visible light irradiation compared with that of the untreated rutile TiO2.

AB - When discharge plasma was generated in an aqueous ammonia solution containing titanium dioxide (TiO2) powder, blue TiO2 was obtained. The blue TiO2 contained oxygen defects and Ti3+ formed by the plasma treatment; i.e., reducing species such as hydrogen radicals generated in situ during ammonia decomposition by plasma were considered to reduce TiO2. No marked changes in the crystallographic structure and specific surface area of TiO2 were observed after the plasma treatment, indicating that TiO2 was not exposed to high temperature. In addition, the plasma-treated TiO2 remained blue when exposed to air for several months. The photocatalytic activity of anatase TiO2 under visible light irradiation was enhanced after plasma treatment. In contrast, the plasma-treated rutile TiO2 showed inferior photocatalytic activity under visible light irradiation compared with that of the untreated rutile TiO2.

KW - Defects

KW - Electron energy loss spectroscopy

KW - Oxide

KW - Photocatalyst

KW - Raman spectroscopy

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