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Tamura, Kazuhisa; Miyaguchi, Shinichiro*; Sakaue, Kiyoshi*; Nishihata, Yasuo; Mizuki, Junichiro
Electrochemistry Communications, 13(5), p.411 - 413, 2011/05
Times Cited Count：13 Percentile：29.93(Electrochemistry)The surface structure of Au(111) electrodes in hydrophobic ionic liquids, 1-butyl-1-methylpyrrolidinium bis (trifluoromethylsulfonyl)amide ([BMP]TFSA) and 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide ([BMIM]TFSA) was investigated using surface X-ray scattering. In both [BMP]TFSA and [BMIM]TFSA, the reconstruction of the surface structure was observed and the phase transition between the (1
1) and the reconstructed structure was found to be reversible. On the other hand, the area of the reconstructed structure in [BMP]TFSA was larger than that in [BMIM]TFSA. These differences suggest that the [BMIM]
-Au interaction is stronger than the [BMP]-Au interaction.
thin films grown by MBEYoneda, Yasuhiro; Sakaue, Kiyoshi*; Terauchi, Hikaru*
Surface Science, 529(3), p.283 - 287, 2003/04
Times Cited Count：8 Percentile：42.93(Chemistry, Physical)Ferroelectric BaTiO thin filmwith a thickness of 10ML were epitaxally grown on SrTiO (001) substrate by very slow deposition using MBE. The investigation were carried out by two growth methods: (i) codeposition and (ii) alternate deposition. In-situ observation of RHEED confirmed that an epitaxial cube-on-cube structure was prepared. After the deposition, X-ray diffraction measurements were carried out. The 10-ML-thick BaTiO films were highly 
-axis oriented single crystals with good film quality.
)
(BaTiO)]
multilayer capacitorYoneda, Yasuhiro; Sakaue, Kiyoshi*; Terauchi, Hikaru*
Japanese Journal of Applied Physics, Part 1, 40(12), p.6888 - 6892, 2001/12
Times Cited Count：2 Percentile：11.81(Physics, Applied)no abstracts in English
thin filmsYoneda, Yasuhiro; Sakaue, Kiyoshi*; Terauchi, Hikaru*
Journal of Physics; Condensed Matter, 13(42), p.9575 - 9582, 2001/10
Times Cited Count：19 Percentile：68.12(Physics, Condensed Matter)no abstracts in English
thin film on Pt/MgO substrateYoneda, Yasuhiro; Sakaue, Kiyoshi*; Terauchi, Hikaru*
Journal of Physics; Condensed Matter, 12(39), p.8523 - 8529, 2000/10
Times Cited Count：9 Percentile：47.89(Physics, Condensed Matter)no abstracts in English
thin-film capacitorYoneda, Yasuhiro; Sakaue, Kiyoshi*; Terauchi, Hikaru*
Japanese Journal of Applied Physics, Part 1, 39(8), p.4839 - 4842, 2000/08
Times Cited Count：16 Percentile：57.57(Physics, Applied)no abstracts in English
thin films grown by molecular beam epitaxyYoneda, Yasuhiro*; *; Sakaue, Kiyoshi*; Terauchi, Hikaru*; *; *
Journal of Applied Physics, 83(5), p.2458 - 2461, 1998/03
Times Cited Count：97 Percentile：94.4(Physics, Applied)no abstracts in English
thin filmsYoneda, Yasuhiro*; *; Sakaue, Kiyoshi*; Terauchi, Hikaru*
Journal of the Korean Physical Society, 32, p.S1393 - S1396, 1998/02
no abstracts in English
/BaTiO multilayer filmsYoneda, Yasuhiro*; *; Sakaue, Kiyoshi*; Terauchi, Hikaru*
Journal of the Korean Physical Society, 32, p.S1636 - S1638, 1998/02
no abstracts in English
films on SrTiO and MgO substratesYoneda, Yasuhiro*; *; Sakaue, Kiyoshi*; Terauchi, Hikaru*
Surface Science, 410(1), p.62 - 69, 1998/00
Times Cited Count：20 Percentile：69.31(Chemistry, Physical)no abstracts in English
Miyaguchi, Shinichiro; Tamura, Kazuhisa; Sakaue, Kiyoshi*; Nishihata, Yasuo
no journal, ,
Surface structures of Au(111) electrode in two ionic liquids (IL), [BMP]TSFA and [BMIM]TSFA was investigated using surface X-ray scattering. In water electrolyte, the restructureing of Au(111) from (11) to (p
) structure occurs within about 100 mV, however, in ionic liquids it occurs within about 600 mV, indicating that mobility of Au atoms at IL/Au inteface is smaller than that at water/Au interface. The structure of restructured (p) domain was also investigated using surface X-ray diffraction, however, the diffraction peak originated from (p) domain wasn't observed at any electrode potential. This result may suggest that the domain size of (p) structure in IL is smaller than that in water electrolyte.
Tamura, Kazuhisa; Miyaguchi, Shinichiro*; Sakaue, Kiyoshi*; Nishihata, Yasuo
no journal, ,
Potential dependence of Au(111) electrode surface structure in 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)amide ([BMP]TFSA) was investigated using in-situ surface X-ray scattering. In the electrochemical window of Au(111) electrode in [BMP]TFSA, three potential regions, that is, reconstruction region (E 
-1.5 V vs. Ag/Ag), (1 1) region (-1.5 E 0.05 V), and (1 1)-II region (0.05 E 0.9 V), were found. In reconstruction region, (1 1) structure turns to reconstructed structure gradually and the reconstructed structure reversibly returns to (1 1) structure in (1 1) region. At the potential between (1 1) and (1 1)-II regions, dips were observed in diffracted intensity originated from (1 1) structure. At this potential, a phase transition, which causes temporary disordering of Au(111) surface, may occur in double layer.
Tamura, Kazuhisa; Miyaguchi, Shinichiro*; Sakaue, Kiyoshi*; Nishihata, Yasuo
no journal, ,
Potential dependence of Au(111) electrode surface structure in 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)amide ([BMP]TFSA) was investigated using in-situ surface X-ray scattering. In the electrochemical window of Au(111) electrode in [BMP]TFSA, three potential regions, that is, reconstruction region (E -1.5 V vs. Ag/Ag), (11) region (-1.5 E 0.05 V), and (11)-II region (0.05 E 0.9 V), were found. In reconstruction region, (11) structure turns to reconstructed structure gradually and the reconstructed structure reversibly returns to (11) structure in (11) region. At the potential between (11) and (11)-II regions, dips were observed in diffracted intensity originated from (11) structure. At this potential, a phase transition, which causes temporary disordering of Au(111) surface, may occur in double layer.
Tamura, Kazuhisa; Miyaguchi, Shinichiro*; Sakaue, Kiyoshi*; Nishihata, Yasuo
no journal, ,
Ionic liquid (IL) is a molten salt at room temperature. Most of ionic liquids consist of organic moleculars; thus, ionic liquids can be designed for desired purposes. Recently, they've been recognized the third solvent and electrolyte. Especially, TFSA anion has strong hydrophobicity; thus TFSA based IL can be used under atomosphere. On the other hand, behaviors of IL/electrode interface have been uncovered due to technical diffulties. In this study, potential dependence of Au(111) surface structure was studied in [BMP] and [BMI]TFSA using surface X-ray diffraction.
Tamura, Kazuhisa; Seno, Ryu; Sakaue, Kiyoshi*; Nishihata, Yasuo; Mizuki, Junichiro
no journal, ,
The surface structure of Au(111) electrodes in hydrophobic ionic liquids, 1-Butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)amide ([BMP]TFSA) and 1-Butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide ([BMIM]TFSA) was investigated using surface X-ray scattering. In both [BMP]TFSA and [BMIM]TFSA, the reconstruction of the surface structure was observed and the phase transition between the (1 X 1) and the reconstructed structure was found to be reversible. On the other hand, the area of the reconstructed structure in [BMP]TFSA was larger than that in [BMIM]TFSA. These differences suggest that the [BMIM]+-Au interaction is stronger than the [BMP]+-Au interaction.
Seno, Ryu; Tamura, Kazuhisa; Nishihata, Yasuo; Mizuki, Junichiro; Sakaue, Kiyoshi*
no journal, ,
The electrodeposited Bi/Au(111) surface structure in 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)amide ([BMIM]TFSA) was investigated using surface X-ray scattering (SXS). The X-ray reflectivity analysis showed that the distance between the electrodeposited Bi layer and the most outer Au surface layer was 2.47 
and it agreed that Bi atoms deposited on the threefold hollow site of Au(111) surface. Further, the distance between the electrodeposited Bi layers was 2.51 and it also agreed that Bi atoms deposited on the threefold hollow site of the Bi layer. The amount of electrodeposited Bi on Au(111) surface was 0.85 monolayer; thus, it was suggested that the electrodeposited Bi formed epitaxial layer on Au(111) surface in [BMIM]TFSA.
; Measurement of thermally stimulated electrical currentsNishihata, Yasuo; Nakanishi, Yusuke*; Sakaue, Kiyoshi*
no journal, ,
no abstracts in English
