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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

Observation of chemisorbed O molecule at SiO/Si(001) interface during Si dry oxidation

Tsuda, Yasutaka; Yoshigoe, Akitaka; Ogawa, Shuichi*; Sakamoto, Tetsuya*; Takakuwa, Yuji*

e-Journal of Surface Science and Nanotechnology (Internet), 21(1), p.30 - 39, 2022/11

https://doi.org/10.1380/ejssnt.2023-005

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 (X)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*; Dio, 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

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

https://doi.org/10.1039/C4CP02675F

Times Cited Count：11 Percentile：40.33(Chemistry, Physical)

Journal Articles

Effect of thermal annealing on the photoluminescence from -FeSi films on Si substrate

Yamaguchi, Kenji; Shimura, Kenichiro; Udono, Haruhiko*; Sasase, Masato*; Yamamoto, Hiroyuki; Shamoto, Shinichi; Hojo, Kiichi

Thin Solid Films, 508(1-2), p.367 - 370, 2006/06

https://doi.org/10.1016/j.tsf.2005.07.354

Times Cited Count：12 Percentile：49.71(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Structural analysis of (Ga,Mn)N epilayers and self-organized dots using MeV ion channeling

Kuroda, Shinji*; Marcet, S.*; Bellet-Amalric, E.*; Cibert, J.*; Mariette, H.*; Yamamoto, Shunya; Sakai, Takuro; Oshima, Takeshi; Ito, Hisayoshi

Physica Status Solidi (A), 203(7), p.1724 - 1728, 2006/05

https://doi.org/10.1002/pssa.200565396

Times Cited Count：6 Percentile：31.23(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Domain boundaries in the GaAs(001)-24 surface

Takahashi, Masamitsu; Yoneda, Yasuhiro; Yamamoto, Naomasa*; Mizuki, Junichiro

Physical Review B, 68(8), p.085321_1 - 085321_5, 2003/08

https://doi.org/10.1103/PhysRevB.68.085321

Times Cited Count：17 Percentile：62.76(Materials Science, Multidisciplinary)

The , and phases of the GaAs(001)-24 surface have been investigated by surface X-ray diffraction in an As flux and at temperatures ranging from 480C to 610C. It has been found that the fractional-order peaks originating from the fourfold symmetry show shift in the [110] direction as well as significant broadening of the peaks in the and phases. The direction of the peak shift is characteristic in each phase. This behavior is explained by the formation of the antiphase domain boundaries. The atomic structure of the domain boundaries is discussed.