Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
(001) surface with supersonic seeded oxygen molecular beamKatsube, Daiki*; Ono, Shinya*; Inami, Eiichi*; Yoshigoe, Akitaka; Abe, Masayuki*
Vacuum and Surface Science, 65(11), p.526 - 530, 2022/11
The oxidation of oxygen vacancies at the surface of anatase TiO (001) was investigated by synchrotron radiation photoelectron spectroscopy and supersonic O 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(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.
(001) surface using supersonic seeded oxygen molecular beamKatsube, 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
Times Cited Count：1 Percentile：6.77(Chemistry, Multidisciplinary)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.
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.
Suzuki, Seiya; Katsube, Daiki*; Yano, Masahiro; Tsuda, Yasutaka; Terasawa, Tomoo; Asaoka, Hidehito; Yuhara, Junji*; Yoshigoe, Akitaka
no journal, ,
no abstracts in English
(001) surfaceKatsube, Daiki*; Ono, Shinya*; Kim, K.*; Tsuda, Yasutaka; Inami, Eiichi*; Yoshigoe, Akitaka; Abe, Masayuki*
no journal, ,
NOx-based gases emitted from engines and plants are an important issue from an environmental perspective. For the detoxification of NO, it is important to understand its reactivity and reaction mechanisms. The reactivity of anatase TiO(001) which is a highly active photocatalyst was studied by using NO supersonic molecular beams and synchrotron radiation XPS. It was found that the N1s peak was observed, indicating that the surface without surface cleaning reacts with NO molecules.
Suzuki, Seiya; Terasawa, Tomoo; Katsube, Daiki*; Yano, Masahiro; Tsuda, Yasutaka; Yuhara, Junji*; Yoshigoe, Akitaka; Asaoka, Hidehito
no journal, ,
no abstracts in English
Terasawa, Tomoo; Suzuki, Seiya; Katsube, Daiki*; Yano, Masahiro; Tsuda, Yasutaka; Yoshigoe, Akitaka; Asaoka, Hidehito
no journal, ,
Germanene, a monolayer honeycomb lattice of Ge atoms, is theoretically predicted to have both a linear band dispersion and a band gap of 23.9 meV and is expected to be a next-generation semiconductor material. The purpose of the present study was to elucidate the growth mechanism of germanene by in situ Raman scattering spectroscopy in a vacuum chamber. The results suggest that Ge atoms crystallize as sp3Ge at around 300 degrees C, lose their crystalline structure at around 500 degrees C, and form a honeycomb lattice as germanene after the rapid cooling to room temperature.
Suzuki, Seiya; Katsube, Daiki*; Yano, Masahiro; Tsuda, Yasutaka; Terasawa, Tomoo; Asaoka, Hidehito; Yuhara, Junji*; Yoshigoe, Akitaka
no journal, ,
Germanene is a two-dimensional (2D) sheet of germanium (Ge) with a honeycomb lattice. Recent theoretical studies have predicted several interesting electronic properties of germanene, such as 2D topological insulators. However, unlike graphene, germanene is easily oxidized in air, making it difficult to realize electrical devices based on germanene. To overcome the drawback of the chemical stability of germanene, it is necessary to understand how germanene is oxidized. Therefore, we started to study germanene and discovered an interesting phenomenon: oxidized germanene can be restored to good quality germanene simply by heating it in ultra-high vacuum (UHV). X-ray photoelectron spectroscopy spectra and low energy electron diffraction patterns indicate that the oxidized germanene is fully recovered after heating at 500 degrees Celsius. The detailed mechanism of the recovery will be discussed in the presentation.
