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
N1 - Funding Information:
The authors acknowledge Ms. Y. Matsuda from the Institute for Materials Research, Tohoku University and Mr. M. Tani and Mr. H. Nakanishi from Osaka Prefecture University for their assistance with sample preparation and characterization. The discussion with Prof. A. Iwase, Prof. K. Okitsu, and Associate Prof. F. Hori from Osaka Prefecture University was helpful. Dr. T. Kumada from Japan Atomic Energy Agency kindly performed ESR measurements. This study was partly supported by the Joint Usage/Research Program of the Photocatalysis International Research Center, Research Institute for Science and Technology, Tokyo University of Science .
Publisher Copyright:
© 2019 Elsevier B.V.
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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U2 - 10.1016/j.apsusc.2019.05.353
DO - 10.1016/j.apsusc.2019.05.353
M3 - Article
AN - SCOPUS:85067016889
VL - 489
SP - 255
EP - 261
JO - Applied Surface Science
JF - Applied Surface Science
SN - 0169-4332
ER -