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Journal Articles

Restoration of oxygen vacancies on an anatase TiO$$_{2}$$(001) surface with supersonic seeded oxygen molecular beam

Katsube, Daiki*; Ono, Shinya*; Inami, Eiichi*; Yoshigoe, Akitaka; Abe, Masayuki*

Vacuum and Surface Science, 65(11), p.526 - 530, 2022/11

https://doi.org/10.1380/vss.65.526

The oxidation of oxygen vacancies at the surface of anatase TiO$$_{2}$$ (001) was investigated by synchrotron radiation photoelectron spectroscopy and supersonic O$$_{2}$$ beam (SSMB). The oxygen vacancies at the top surface and subsurface could be eliminated by the supply of hyperthermal oxygen molecules. Oxygen vacancies are present on the surface of anatase TiO$$_{2}$$(001) when it is untreated before transfer to a vacuum chamber. These vacancies, which are stable in the ambient condition, could also be effectively eliminated by using oxygen SSMB. This result is promising as a surface processing for various functional oxides.

Journal Articles

Oxidation mechanisms of hafnium overlayers deposited on an Si(111) substrate

Kakiuchi, Takuhiro*; Matoba, Tomoki*; Koyama, Daisuke*; Yamamoto, Yuki*; Yoshigoe, Akitaka

Langmuir, 38(8), p.2642 - 2650, 2022/03

https://doi.org/10.1021/acs.langmuir.1c02711
 Times Cited Count：1 Percentile：14.86(Chemistry, Multidisciplinary)

0xidation processes at the interface and the surface of Si(111) substrate with thin Hf films were studied using photoelectron spectroscopy in conjunction with supersonic oxygen molecular beams (SOMB). The oxidation starts at the outermost Hf layers and produces stoichiometric HfO$$_{2}$$. Hf silicates (Hf-O-Si configuration) were generated in the vicinity of the HfO$$_{2}$$/Si interface in the case of the irradiation of 2.2 eV SOMB. The oxidation of the Si substrate takes place to generate SiO$$_{2}$$ compounds. Si atoms were emitted from the SiO$$_{2}$$/Si interface region underneath the HfO$$_{2}$$ overlayers to release the stress generated within the strained Si layers. The emitted Si atoms can pass through the HfO$$_{2}$$ overlayers and react with the impinging O$$_{2}$$ gas.

Journal Articles

Revisit of XPS studies of supersonic O$$_{2}$$ molecular adsorption on Cu(111); Copper oxides

Hayashida, Koki*; Tsuda, Yasutaka; Yamada, Takashi*; Yoshigoe, Akitaka; Okada, Michio*

ACS Omega (Internet), 6(40), p.26814 - 26820, 2021/10

https://doi.org/10.1021/acsomega.1c04663
 Times Cited Count：7 Percentile：44.69(Chemistry, Multidisciplinary)

We report the X-ray photoemission spectroscopy (XPS) characterization of the bulk Cu$$_{2}$$O(111) surface and 8-type and 29-type oxide structures on Cu(111) prepared by using 0.5 eV O$$_{2}$$ supersonic molecular beam (SSMB) source. We propose a new structural model for the 8-type oxide structure and also confirmed the previously proposed model for the [29] oxide structure on Cu(111), based on the O1s XPS spectra. The detection-angle dependence of the O 1s spectra supports that the nanopyramidal model is more preferable for the ($$sqrt{3}$$X$$sqrt{3}$$)R30$$^{circ}$$ Cu$$_{2}$$O(111). We also report the electronic excitations which O1s electrons suffer.

Journal Articles

Experimental and theoretical studies on oxidation of Cu-Au alloy surfaces; Effect of bulk Au concentration

Okada, Michio*; Tsuda, Yasutaka*; Oka, Kohei*; Kojima, Kazuki*; Di$~n$o, W. A.*; Yoshigoe, Akitaka; Kasai, Hideaki*

Scientific Reports (Internet), 6, p.31101_1 - 31101_8, 2016/08

https://doi.org/10.1038/srep31101
 Times Cited Count：28 Percentile：73.49(Multidisciplinary Sciences)

We report results of our experimental and theoretical studies on the oxidation of Cu-Au alloy surfaces, viz., Cu$$_{3}$$Au(111), CuAu(111), and Au$$_{3}$$Cu(111), using hyperthermal O$$_{2}$$ molecular beam (HOMB). We observed strong Au segregation to the top layer of the corresponding clean (111) surfaces. This forms a protective layer that hinders further oxidation into the bulk. The higher the concentration of Au in the protective layer formed, the higher the protective efficacy. As a result, of the three Cu-Au surfaces studied, Au$$_{3}$$Cu(111) is the most stable against dissociative adsorption of O$$_{2}$$, even with HOMB. We also found that this protective property breaks down for oxidations occurring at temperatures above 300 K.

Journal Articles

Surface temperature dependence of oxidation of Cu$$_{3}$$Au(111) by an energetic oxygen molecule

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

Materials Research Express (Internet), 3(3), p.035014_1 - 035014_8, 2016/03

https://doi.org/10.1088/2053-1591/3/3/035014
 Times Cited Count：5 Percentile：18.8(Materials Science, Multidisciplinary)

We report a study on the surface-temperature ($$T_{s}$$) dependence of oxidation process at Cu$$_{3}$$Au(111) by using a hyperthermal oxygen molecular beam and synchrotron-radiation X-ray photoemission spectroscopy. The O-1s spectra and the corresponding O-uptake curves demonstrate that Cu$$_{2}$$O domains grow effectively at high $$T_{s}$$ of 400 and 500 K. The simple analysis of the O distribution suggests that the temperature-induced atomic diffusion causes the Cu$$_{2}$$O domains growing thicker at 500 K. The oxidation of Cu$$_{3}$$Au(111) is less efficient at $$T_{s}$$ = 300-500 K than that of Cu(111), demonstrating that the protective nature of Cu$$_{3}$$Au against oxidation, in comparison to Cu, remains even at high $$T_{s}$$.

Journal Articles

Time resolved photoemission spectroscopy on Si(001)-2$$times$$1 surface during oxidation controlled by translational kinetic energy of O$$_{2}$$ at room tempearture

Yoshigoe, Akitaka; Teraoka, Yuden

Surface Science, 532-535, p.690 - 697, 2003/06

https://doi.org/10.1016/S0039-6028(03)00412-6
 Times Cited Count：22 Percentile：69.44(Chemistry, Physical)

no abstracts in English

Journal Articles

Initial oxidation prosesses of Si(001) surfaces by supersonic O$$_{2}$$ molecular beams; Different oxidation mechanisms for clean and partially-oxidized surfaces

Teraoka, Yuden; Yoshigoe, Akitaka

Shinku, 45(7), p.604 - 608, 2002/07

https://doi.org/10.3131/jvsj.45.604

no abstracts in English

Journal Articles

${it Real time}$ observation on oxygen chemisorption states on Si(001)-2$$times$$1 during supersonic oxygen molecular beam irradiation

Yoshigoe, Akitaka; Teraoka, Yuden

Applied Surface Science, 190(1-4), p.60 - 65, 2002/05

https://doi.org/10.1016/S0169-4332(01)00839-X
 Times Cited Count：10 Percentile：47.94(Chemistry, Physical)

no abstracts in English

Journal Articles

Si 2p and O 1s photoemission from oxidized Si(001) surfaces depending on translational kinetic energy of incident O$$_{2}$$ molecules

Teraoka, Yuden; Yoshigoe, Akitaka

Applied Surface Science, 190(1-4), p.75 - 79, 2002/05

https://doi.org/10.1016/S0169-4332(01)00842-X
 Times Cited Count：12 Percentile：53.21(Chemistry, Physical)

no abstracts in English

Journal Articles

In situ photoemission spectroscopy using synchrotron radiation for O$$_{2}$$ translational kinetic energy induced oxidation processes of partially-oxidized Si(100) surfaces

Teraoka, Yuden; Yoshigoe, Akitaka

Hyomen Kagaku, 22(8), p.530 - 536, 2001/08

https://doi.org/10.1380/jsssj.22.530

no abstracts in English

Journal Articles

Initial oxidation states on Si(001) surface induced by translational kinetic energy of O$$_{2}$$ at room temperature studied by Si-2p core-level spectroscopy using synchrotron radiation

Yoshigoe, Akitaka; Teraoka, Yuden

Surface Science, 482-485(Part.1), p.189 - 195, 2001/06

no abstracts in English

JAEA Reports

Specifications for surface reaction analysis apparatus

Teraoka, Yuden; Yoshigoe, Akitaka

JAERI-Tech 2001-006, 91 Pages, 2001/03

JAERI-Tech-2001-006.pdf:3.51MB

no abstracts in English

JAEA Reports

Manufacture of surface reaction analysis apparatus and its application to analysis of initial oxidation processes on Si(001) surfaces

Teraoka, Yuden; Yoshigoe, Akitaka; Sano, Mutsumi*

JAERI-Tech 2000-080, 33 Pages, 2001/02

JAERI-Tech-2000-080.pdf:3.12MB

no abstracts in English

Journal Articles

Commissioning of surface chemistry end-station in BL23SU of SPring-8

Teraoka, Yuden; Yoshigoe, Akitaka

Applied Surface Science, 169-170, p.738 - 741, 2001/01

https://doi.org/10.1016/S0169-4332(00)00779-0
 Times Cited Count：67 Percentile：91.86(Chemistry, Physical)

no abstracts in English

Journal Articles

Initial oxidation processes on Si(100) surface induced by translational kinetic energy of O$$_{2}$$ molecules

Teraoka, Yuden; Yoshigoe, Akitaka

Goku Usu Shirikon Sankamaku No Keisei, Hyoka, Shinraisei Dai-6-Kai Kenkyukai Hobunshu, p.259 - 264, 2001/00

no abstracts in English

Journal Articles

Photoemission and molecular scattering study on initial oxidation of Si(001) surfaces induced by O$$_{2}$$ translational energy

Teraoka, Yuden; Yoshigoe, Akitaka; Sano, Mutsumi*

Proceedings of the Symposium on Surface Science 2001, p.86 - 89, 2001/00

no abstracts in English

Journal Articles

Initial oxidation of Si(001) surfaces induced by translational energy of O$$_{2}$$ molecules

Teraoka, Yuden; Yoshigoe, Akitaka; Sano, Mutsumi*

Proceedings of 22nd Symposium on Dry Proceess (DPS 2000), p.85 - 90, 2000/11

no abstracts in English

Journal Articles

Influence of translational energy for surface reaction of silicon with oxygen molecules

Teraoka, Yuden; Yoshigoe, Akitaka; Sano, Mutsumi

Hyomen Kagaku, 21(7), p.54 - 57, 2000/07

no abstracts in English

Journal Articles

Kinetic energy effects of oxygen molecular beams in initial oxidation of silicon surfaces

Teraoka, Yuden; Yoshigoe, Akitaka; Sano, Mutsumi

Shinku, 43(3), P. 412, 2000/03

https://doi.org/10.3131/jvsj.43.381

no abstracts in English

Journal Articles

Design of surface chemistry end-station of BL23SU in SPring-8

Teraoka, Yuden; Yoshigoe, Akitaka*

Japanese Journal of Applied Physics, 38(Suppl.38-1), p.642 - 645, 1999/00

https://doi.org/10.1143/JJAP.38.L642
 Times Cited Count：17 Percentile：60.61(Physics, Applied)

no abstracts in English

28 (Records 1-20 displayed on this page)