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2) investigated using supersonic seeded molecular beamsOno, Shinya*; Tanaka, Kazuma*; Kodama, Hiraku*; Tanaka, Masatoshi*; Yoshigoe, Akitaka; Teraoka, Yuden*
Surface Science, 697, p.121600_1 - 121600_6, 2020/07
Times Cited Count：1 Percentile：5.82(Chemistry, Physical)The initial oxidation on silicon surfaces with (113) orientation has been investigated by high-resolution photoelectron spectroscopy with synchrotron radiation. In the present study, we investigated both the Si2p state and O1s state to evaluate the oxide thickness, composition, and to assess the strain at the SiO
/Si interface. In the Si2p state, the oxidized components (Si
, Si
, Si
, Si
) were analyzed. In the O1s state, a low-binding-energy component (LBC) and a high-binding-energy component (HBC) were analyzed. To investigate the non-thermal oxidation process, we utilized the supersonic seeded molecular beam (SSMB) to enhance the translational kinetic energies (
) of oxygen molecules. We demonstrate that the oxide quality and oxidation kinetics are largely altered by changing .
Yoneda, Yasuhiro; Yoshigoe, Akitaka; Takeda, Yukiharu; Shiwaku, Hideaki; Matsumura, Daiju; Shobu, Takahisa; Tamura, Kazuhisa
Materia, 58(12), p.763 - 769, 2019/12
This is an introduction to the equipment provided for each implementation period belonging to the structure analysis platform in the nanotechnology platform.
Li, R.*; Pang, C.*; Amekura, Hiroshi*; Ren, F.*; H
bner, R.*; Zhou, S.*; Ishikawa, Norito; Okubo, Nariaki; Chen, F.*
Nanotechnology, 29(42), p.424001_1 - 424001_8, 2018/10
Times Cited Count：5 Percentile：24.95(Nanoscience & Nanotechnology)We report on the fabrication of reshaped Ag nanoparticles (NPs) embedded in a Nd:YAG crystal by combining Ag ion implantation and swift heavy Xe ion irradiation. The localized surface plasmon resonance (LSPR) effect is proved to be efficiently modulated according to the phenomenon of polarization-dependent absorption. The LSPR peak located at 448 nm shows red shift and blue shift at 0 degree and 90 degree polarization, respectively, which is in good agreement with calculation by discrete dipole approximation. Based on the near-field intensity distribution, the interaction between reshaped NPs shows a non-ignorable effect on the optical absorption. Furthermore, the polarization-dependence of the photoluminescence (PL) intensity is analyzed, which is positively related to the modulated LSPR absorption. It demonstrates the potential of the enhancement of PL intensity by embedded plasmonic Ag NPs.
/Ge gate stacks with ultrathin aluminum oxide interlayersAsahara, Ryohei*; Hideshima, Iori*; Oka, Hiroshi*; Minoura, Yuya*; Ogawa, Shingo*; Yoshigoe, Akitaka; Teraoka, Yuden; Hosoi, Takuji*; Shimura, Takayoshi*; Watanabe, Heiji*
Applied Physics Letters, 106(23), p.233503_1 - 233503_4, 2015/06
Times Cited Count：21 Percentile：65.02(Physics, Applied)Advanced metal/high-/Ge gate stacks with a sub-nm equivalent oxide thickness and improved interface properties were demonstrated by controlling interface reactions using ultrathin aluminum oxide (AlOx) interlayers. Comprehensive study by means of physical and electrical characterizations revealed distinct impacts of AlOx interlayers, plasma oxidation.
Yamaki, Tetsuya
no journal, ,
We have realized the importance of developing micro/nanofabrication techniques for fluoropolymers in order to further pursue the potential for their future applications. My talk is devoted to our recent research activities on (1) ion-track membranes of poly(vinylidene fluoride) (PVDF) and (2) proton-conductive membranes prepared by ion-track grafting into poly(ethylene-co-tetrafluoroethylene) (ETFE) films. Both of them include the creation of fluoropolymer-based nanostructures with swift heavy ions mainly from the cyclotron of the Takasaki Ion Accelerators for Advanced Radiation Application (TIARA), JAEA.
molecule at SiO/Si interfaces studied by real-time X-ray photoelectron spectroscopyTang, J.*; Ogawa, Shuichi*; Yoshigoe, Akitaka; Ishizuka, Shinji*; Takakuwa, Yuji*
no journal, ,
The reaction kinetics of O molecule at SiO/Si interfaces were investigated as a function of O pressure (PO) by real-time X-ray photoelectron spectroscopy at BL23SU, SPring-8, to monitor the interfacial oxide growth rate (Rint), the oxidation states (Si, Si, Si and Si, and the magnitude of oxidation-induced strain (Si
and Si
) at the same time during oxidation. When increasing PO after the surface oxidation, Rint showed a nonlinear power-low function of (PO)
, where n was almost the same as 0.5 for both Si(111) and Si(001) substrates. The results are interpreted by a Si oxidation model, in which the defect generated by the oxidation-induced strain is an active site for dissociative adsorption of O at SiO/Si interface. Furthermore, when increasing PO during the surface oxidation, Si and Si showed significant changes at the start of interfacial oxidation.
Teraoka, Yuden; Konishi, Hiroyuki; Katayama, Yoshinori
no journal, ,
no abstracts in English
Teraoka, Yuden; Konishi, Hiroyuki; Katayama, Yoshinori
no journal, ,
no abstracts in English
Teraoka, Yuden; Konishi, Hiroyuki; Katayama, Yoshinori
no journal, ,
no abstracts in English
Teraoka, Yuden; Konishi, Hiroyuki; Katayama, Yoshinori
no journal, ,
no abstracts in English
Yoshigoe, Akitaka
no journal, ,
The lecture concerning the utilization of surface chemistry end-station at BL23SU in SPring-8 will be held as part of the Nanotechnology Platform Japan program of MEXT for the year 2016.
Yoshigoe, Akitaka
no journal, ,
Decontamination of Cs trapped in clays is considered to be difficult because Cs atoms tightly bind to the clays. Therefore, the development of the methods to efficiently remove Cs from polluted areas has become a matter of great importance and has motivated research into basic understanding Cs adsorption to clay and its physicochemical properties. In this study, a synchrotron radiation photoemission electron microscope (SR-PEEM) was applied to demonstrate pinpoint analysis of micrometer-sized weathered biotite clay particles with artificially adsorbed non-radioactive Cs. Despite the insulating properties of the clay, we observed the spatial distributions of constituent elements with nanometer resolution without charging issues through a proper surface treatment. Pinpoint XAS spectra indicated the chemical states of Fe and Cs. The results strongly suggest that Cs adsorption took place via electrical charge compensation mechanisms. Further technical developments are required to apply to real-world samples with extremely low Cs content; however, we succeeded the first step towards applying this method to nanoscale analysis of Cs-adsorbed clay minerals.
Yoshigoe, Akitaka
no journal, ,
The 2019 workshop on synchrotron radiation equipment will be held by JAEA, NIMS and QST. They are the members of a nanotechnology platform project of the Ministry of Education, Culture, Sports, Science and Technology. In this lecture, surface chemistry experiment station will be explained to find new users for the surface and interface nanotechnoly research.
