Oxidation of anatase TiO(001) surface using supersonic seeded oxygen molecular beam

Katsube, Daiki*; Ono, Shinya*; Takayanagi, Shuhei*; Ojima, Shoki*; Maeda, Motoyasu*; Origuchi, Naoki*; Ogawa, Arata*; Ikeda, Natsuki*; Aoyagi, Yoshihide*; Kabutoya, Yuito*; et al.

Langmuir, 37(42), p.12313 - 12317, 2021/10

https://doi.org/10.1021/acs.langmuir.1c01752

We investigated the oxidation of oxygen vacancies at the surface of anatase TiO(001) using supersonic seeded molecular beam (SSMB) of oxygen. The oxygen vacancies at the top-surface and sub-surface could be eliminated by the supply of oxygen using an SSMB. These results indicate that the interstitial vacancies can be mostly assigned to oxygen vacancies, which can be effectively eliminated by using an oxygen SSMB. Oxygen vacancies are present on the surface of anatase TiO(001) when it is untreated before transfer to a vacuum chamber. These vacancies, which are stable in the as-grown condition, could also be effectively eliminated using the oxygen SSMB.

Surface modification effects on hydrogen absorption property of a hydrogen storage alloy by short pulse laser irradiation

Abe, Hiroshi; Shimomura, Takuya; Tokuhira, Shinnosuke*; Shimada, Yukihiro*; Takenaka, Yusuke*; Furuyama, Yuta*; Nishimura, Akihiko; Uchida, Hirohisa*; Daido, Hiroyuki; Oshima, Takeshi

Proceedings of 7th International Congress on Laser Advanced Materials Processing (LAMP 2015) (Internet), 4 Pages, 2015/08

A short pulse laser (the nanosecond and femtosecond) was applied to hydrogen absorbing alloys surface layer, and a surface modification experiment was put into effective to aim at improvement of hydrogen adsorption functionally. It was investigated about correlation between an initial hydrogen absorption reaction rate of hydrogen alloys and a laser irradiation in this research. The laser irradiation condition was done with pulse width 100 fsec and energy 0.2 - 3.4 mJ/pulse. It blazed down on hydrogen absorbing alloys (LaNiAl) and changed local order in the surface. As a result, the initial hydrogen absorption reaction rate was 1.5 - 3.0 times as fast as a irradiated sample, and the result and laser irradiated sample found out that a hydrogen absorption function improves. A laser irradiation can conclude to be effective in surface modification of the hydrogen storage materials.

Surface modification of hydrogen storage alloy using multiplex energy proton beam irradiation

Abe, Hiroshi; Moriyama, Kazuhiro*; Tokuhira, Shinnosuke*; Uchida, Hirohisa*; Oshima, Takeshi

no journal, , 

no abstracts in English

Irradiation treatment effects on hydrogen storage alloy

Tokuhira, Shinnosuke*; Onuki, Shun*; Uchida, Hirohisa*; Matsumura, Yoshihito*; Abe, Hiroshi

no journal, , 

no abstracts in English

Effects of electron irradiation and alkaline pretreatments on the initial hydrogen absorption rate by LaNiAl

Ono, Taiga*; Tokuhira, Shinnosuke*; Abe, Hiroshi; Hiraki, Takeshi*; Uchida, Hirohisa*

no journal, , 

no abstracts in English

X-ray characterization of short pulse laser illuminated hydrogen storage alloys having very high performance

Daido, Hiroyuki; Abe, Hiroshi; Shobu, Takahisa; Shimomura, Takuya; Tokuhira, Shinnosuke*; Takenaka, Yusuke*; Furuyama, Takehiro*; Nishimura, Akihiko; Uchida, Hirohisa*; Oshima, Takeshi

no journal, , 

no abstracts in English

Soft X-ray photoemission spectroscopy of water-adsorbed titanium dioxide surfaces

Katsube, Daiki*; Ono, Shinya*; Takayanagi, Shuhei*; Ojima, Shoki*; Maeda, Motoyasu*; Yoshida, Hikaru*; Nishi, Shizuka*; Yoshigoe, Akitaka; Abe, Masayuki*

no journal, , 

TiO has been extensively studied because of high photocatalytic activity. However, the basic reaction process of photocatalysis has not been understood yet. In this study, the difference in water adsorption reaction between rutile and anatase was clarified using synchrotron radiation soft X-ray photoelectron spectroscopy (XPS). The OH component observed at the higher binding energy side was clearly confirmed in the rutile type TiOTiO, suggesting that the rutile type is more reactive to water adsorption.

窒素元素ドープ酸化チタンの製造方法

吉越 章隆

阿部 真之*; 勝部 大樹*; 大野 真也*

JP, 2019-153049  Patent licensing information  Patent publication (In Japanese)

【課題】 効率的なN元素ドープTIO2の製造方法を提供する。 【解決手段】本発明に係るN元素ドープTIO2の製造方法は、ターゲットとなるTIO2を真空チャンバ内の所定位置に配置するステップと、真空チャンバを真空引きするステップと、ノズルを所定温度に加熱するステップと、ノズルを所定温度に維持しつつ、ノズルからNO分子の超音速分子線をターゲットに照射するステップとを備える。