The Effects of alloying and segregation for the reactivity and diffusion of oxygen on Cu$$_{3}$$Au(111)
岡 耕平*; 津田 泰孝*; 牧野 隆正*; 岡田 美智雄*; Dino, W.*; 橋之口 道宏*; 吉越 章隆; 寺岡 有殿; 笠井 秀明*
Oka, Kohei*; Tsuda, Yasutaka*; Makino, Takamasa*; Okada, Michio*; Dino, W.*; Hashinokuchi, Michihiro*; Yoshigoe, Akitaka; Teraoka, Yuden; Kasai, Hideaki*
Oxidation of Cu$$_{3}$$Au(111) by a hyperthermal O$$_{2}$$ molecular beam was investigated by synchrotron X-ray photoemission spectroscopy. From the incident-energy dependence of O-uptake curve, dissociative adsorption of O$$_{2}$$ is less effective on Cu$$_{3}$$Au(111) than on Cu(111). The dissociative adsorption is accompanied by the Cu segregation on Cu$$_{3}$$Au(111) as well on Cu$$_{3}$$Au(100) and Cu$$_{3}$$Au(110). Obvious growth of Cu$$_{2}$$O cannot be observed at incident energy of 2.3 eV and it suggests that Au-rich layers prevent the diffusion of O atoms into bulk. Density functional theory calculations indicate that O adsorption shows same behavior on Cu$$_{3}$$Au(111) and on Cu(111). The barrier of diffusion into subsurface in segregated Cu$$_{3}$$Au(111) is higher than that of Cu(111). It indicates that segregated Au-rich layer works as a protective layer.
使用言語 : English
掲載資料名 : Physical Chemistry Chemical Physics
: 16
: 36
ページ数 : p.19702 - 19711
発行年月 : 2014/08
出版社名 : Royal Society of Chemistry
特許データ :
論文URL :
キーワード : Cu3Au; 放射光光電子分光; 超音速酸素分子線
使用施設 :
広報プレスリリース :
受委託・共同研究相手機関 : 大阪大学
登録番号 : AA20140209
抄録集掲載番号 : 42001121
論文投稿番号 : 14765
Accesses  (From Jun. 2, 2014)
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