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Journal Articles

CH$$_3$$Cl dissociation, CH$$_3$$ abstraction, and Cl adsorption from the dissociative scattering of supersonic CH$$_3$$Cl on Cu(111) and Cu(410)

Makino, Takamasa*; Tsuda, Yasutaka; Yoshigoe, Akitaka; Di$~n$o, W. A.*; Okada, Michio*

Applied Surface Science, 642, p.158568_1 - 158568_6, 2024/01

Journal Articles

Interface atom mobility and charge transfer effects on CuO and Cu$$_{2}$$O formation on Cu$$_{3}$$Pd(111) and Cu$$_{3}$$Pt(111)

Tsuda, Yasutaka; Gueriba, J. S.*; Makino, Takamasa*; Di$~n$o, W. A.*; Yoshigoe, Akitaka; Okada, Michio*

Scientific Reports (Internet), 11, p.3906_1 - 3906_8, 2021/02

 Times Cited Count:2 Percentile:16.84(Multidisciplinary Sciences)

Journal Articles

The Effects of alloying and segregation for the reactivity and diffusion of oxygen on Cu$$_{3}$$Au(111)

Oka, Kohei*; Tsuda, Yasutaka*; Makino, Takamasa*; Okada, Michio*; Hashinokuchi, Michihiro*; Yoshigoe, Akitaka; Teraoka, Yuden; Kasai, Hideaki*

Physical Chemistry Chemical Physics, 16(36), p.19702 - 19711, 2014/08

 Times Cited Count:11 Percentile:40.66(Chemistry, Physical)

Journal Articles

Initial stages of Cu$$_{3}$$Au(111) oxidation; Oxygen induced Cu segregation and the protective Au layer profile

Tsuda, Yasutaka*; Oka, Kohei*; Makino, Takamasa*; Okada, Michio*; Di$~n$o, W. A.*; Hashinokuchi, Michihiro*; Yoshigoe, Akitaka; Teraoka, Yuden; Kasai, Hideaki*

Physical Chemistry Chemical Physics, 16(8), p.3815 - 3822, 2014/02

 Times Cited Count:14 Percentile:49.2(Chemistry, Physical)

Oral presentation

Face dependent oxidation of Cu$$_{3}$$Au using hyperthermal O$$_{2}$$ molecular beam

Hashinokuchi, Michihiro*; Okada, Michio*; Tsuda, Yasutaka*; Makino, Takamasa*; Yoshigoe, Akitaka; Teraoka, Yuden

no journal, , 

Oral presentation

Surface orientation dependence of oxidation processes at Cu$$_{3}$$Au alloy surface by using hyperthermal molecular beams

Tsuda, Yasutaka*; Hashinokuchi, Michihiro*; Makino, Takamasa*; Okada, Michio*; Yoshigoe, Akitaka; Teraoka, Yuden

no journal, , 

no abstracts in English

Oral presentation

Surface temperature dependence of oxidation processes at Cu$$_{3}$$Au(110) surface

Hashinokuchi, Michihiro*; Tsuda, Yasutaka*; Makino, Takamasa*; Okada, Michio*; Yoshigoe, Akitaka; Teraoka, Yuden

no journal, , 

no abstracts in English

Oral presentation

Surface temperature dependence of oxidation of Cu$$_{3}$$Au(110) using a hyperthermal O$$_{2}$$ molecular molecular beam

Hashinokuchi, Michihiro*; Okada, Michio*; Tsuda, Yasutaka*; Makino, Takamasa*; Yoshigoe, Akitaka; Teraoka, Yuden

no journal, , 

no abstracts in English

Oral presentation

Initial stages of Cu$$_{3}$$Au(111) oxidation

Tsuda, Yasutaka*; Makino, Takamasa*; Hashinokuchi, Michihiro*; Okada, Michio*; Oka, Kohei*; Di$~n$o, W. A.*; Kasai, Hideaki*; Yoshigoe, Akitaka; Teraoka, Yuden

no journal, , 

Oral presentation

The Protective layer formation on Cu$$_{3}$$Au(111) surface

Tsuda, Yasutaka*; Oka, Kohei*; Makino, Takamasa*; Lehmuskoski, J.*; Okada, Michio*; Di$~n$o, W. A.*; Kasai, Hideaki*; Yoshigoe, Akitaka; Teraoka, Yuden

no journal, , 

no abstracts in English

Oral presentation

Surface temperature dependence of oxidation of Cu3Au(111)

Tsuda, Yasutaka*; Makino, Takamasa*; Okada, Michio*; Yoshigoe, Akitaka; Teraoka, Yuden

no journal, , 

Oxidation processes of alloy materials are important chemical reactions for the fabrication of protective layers used in various industrial applications. In this study, surface temperature dependence of oxidation of Cu$$_{3}$$Au(111) was studied using synchrotron radiation XPS and molecular beams. It was found that no dependence among uptake curves was observed from 300 to 500 K in low oxygen dosage because a direct dissociative adsorption takes place in this incident energy region. In contrast, clear difference between 400 and 500 K due to Cu$$_{2}$$O formation was observed. This result suggests that thermal-driven diffusion of Au atoms into bulk depress the protective function for oxidation.

Oral presentation

Initial oxidation of Cu$$_{3}$$Pd(111) surface

Tsuda, Yasutaka*; Makino, Takamasa*; Tsukada, Chie; Yoshigoe, Akitaka; Fukuyama, Tetsuya*; Okada, Michio*

no journal, , 

It is well-known that oxidation is an important chemical reactions in corrosion processes. Cu$$_{3}$$Pd has an attracting material due to its catalytic property and its oxidation is the important subject. In this presentation, initial oxidation processes at the Cu$$_{3}$$Pd(111) surface was studied by using molecular beams. In situ photoemission measurements were conducted using surface chemistry apparatus at BL23SU at SPring-8. Single crystal Cu$$_{3}$$Pd was used after cleaning by means of Ar ion sputtering and annealing. It was found that molecular beams facilitate oxidation compared to that for backfilling condition. Furthermore, diffusion of surface atoms seems to be driven with increasing surface temperature.

Oral presentation

Reaction of C$$_{2}$$H$$_{4}$$ on Cu(111) using supersonic C$$_{2}$$H$$_{4}$$ molecular beam

Makino, Takamasa*; Tsuda, Yasutaka*; Tsukada, Chie; Yoshigoe, Akitaka; Okada, Michio*

no journal, , 

Studies on the interaction between ethylene molecule and metal surfaces are the important subject to understand catalyitic reactions such as dehydrogenation. To clarify dissociation adsorption processes of ethylene at metal surfaces, the surface analysis after exposure of ethylene to Cu(111) surface was conducted by using synchrotron radiation XPS. We found the growth of peak intensities and the peak shifted to higher binding energy side when ethylene beams with the kinetic energy of 2 eV were irradiated at the surface temperature of 300 K. The adsorption states and surface temperature dependece of reactions will be discussed.

Oral presentation

Oxidation of Cu$$_{3}$$Pt(111) surface with hyperthermal oxygen molecule

Tsuda, Yasutaka*; Makino, Takamasa*; Tsukada, Chie; Yoshigoe, Akitaka; Fukuyama, Tetsuya*; Okada, Michio*

no journal, , 

Oxidation is a main reaction in corrosion processes and its understabding is important to develop anticorrosion materials. In this study, initial oxidation at Cu$$_{3}$$Pt(111) surface was investigated by using surface analysis apparatus at BL23SU of SPring-8. The surface oxidized by 2.3 eV molecular beams was analzyed by synchrotron radiation photoelectron spectroscopy. We confirmed that Cu L$$_{3}$$M$$_{4.5}$$M$$_{4.5}$$ AES spectrum and Cu-2p XPS spectrum show the only growth of Cu oxide whereas Pt oxide was not formed from the results of Pt-4f XPS. It was also found that the reactivity of Cu$$_{3}$$Pd(111) surface is lower than that of Cu$$_{3}$$Au(111) surface.

Oral presentation

Initial oxidation of copper alloy surfaces with a hyperthermal oxygen molecular beam

Tsuda, Yasutaka*; Makino, Takamasa*; Yoshida, Hikaru; Yoshigoe, Akitaka; Fukuyama, Tetsuya*; Okada, Michio*

no journal, , 

Initial stage of corrosion is one of the central topics in material science. In the present study, we report the results of oxidation on Cu$$_{3}$$Pd(111) and Cu$$_{3}$$Pt(111) with a hyperthermal O$$_{2}$$ molecular beam (HOMB) with variable incident energies, using X-ray photoemission spectroscopy in conjunction with synchrotron radiation. All experiments were performed using the Surface Reaction Analysis Apparatus constructed in BL23SU at SPring-8. The Cu$$_{3}$$Pd(111) and Cu$$_{3}$$Pt(111) samples were cleaned by Ar+ sputtering and annealing. The kinetic energy of the HOMB was set to be 2.3 eV. From the uptake curves, it was found that the oxidation of Cu$$_{3}$$Pt is less effective than that on Cu$$_{3}$$Au and Cu$$_{3}$$Pd. This suppression of the surface reactivity may be caused by the Pt-rich subsurface layer.

Oral presentation

Surface reaction of supersonic C$$_{2}$$H$$_{4}$$ on Cu(410)

Makino, Takamasa*; Tsuda, Yasutaka*; Yoshida, Hikaru; Yoshigoe, Akitaka; Okada, Michio*

no journal, , 

The de-hydrogenation reaction of hydrocarbon molecules at metal surface is important as an elementary process of graphene generation and various catalytic reactions. In order to investigate C$$_{2}$$H$$_{4}$$ reactions at Cu(410) surface, C$$_{2}$$H$$_{4}$$ molecular beams and synchrotron radiation X-rays photoelectron spectroscopy was used. We found that the chemical species which became dehydrogenation adsorbs at the surface when C$$_{2}$$H$$_{4}$$ molecule has kinetic energy of 2 eV.

Oral presentation

Surface temperature dependence of oxide formation on Cu$$_{3}$$Pt(111)

Tsuda, Yasutaka*; Makino, Takamasa*; Yoshida, Hikaru; Yoshigoe, Akitaka; Fukuyama, Tetsuya*; Okada, Michio*

no journal, , 

The oxidation with oxygen molecules is important in a metal corrosion process. In order to develop high noncorrosive materials, the understanding of oxidation processes is significant. In this study, the influence on oxidation reaction due to alloy ingredient difference was investigated by the comparison between Cu$$_{3}$$Au(111) and Cu$$_{3}$$Pt(111) surfaces. It was found that the Cu$$_{3}$$Pt(111) surface has lower reactivity than the Cu$$_{3}$$Au(111) surface.

17 (Records 1-17 displayed on this page)
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