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Journal Articles

Bithiophene with winding vine-shaped molecular asymmetry; Preparation, structural characterization, and enantioselective synthesis

Toyomori, Yuka*; Tsuji, Satoru*; Mitsuda, Shinobu*; Okayama, Yoichi*; Ashida, Shiomi*; Mori, Atsunori*; Kobayashi, Toru; Miyazaki, Yuji; Yaita, Tsuyoshi; Arae, Sachie*; et al.

Bulletin of the Chemical Society of Japan, 89(12), p.1480 - 1486, 2016/09

 Times Cited Count:6 Percentile:27.13(Chemistry, Multidisciplinary)

Journal Articles

Effects of growth temperature and growth rate on polytypes in gold-catalyzed GaAs nanowires studied by in situ X-ray diffraction

Takahashi, Masamitsu; Kozu, Miwa*; Sasaki, Takuo

Japanese Journal of Applied Physics, 55(4S), p.04EJ04_1 - 04EJ04_4, 2016/04

 Times Cited Count:5 Percentile:28.82(Physics, Applied)

Journal Articles

Real-time observation of rotational twin formation during molecular-beam epitaxial growth of GaAs on Si (111) by X-ray diffraction

Suzuki, Hidetoshi*; Nakata, Yuka*; Takahashi, Masamitsu; Ikeda, Kazuma*; Oshita, Yoshio*; Morohara, Osamu*; Geka, Hirotaka*; Moriyasu, Yoshitaka*

AIP Advances (Internet), 6(3), p.035303_1 - 035303_6, 2016/03

 Times Cited Count:4 Percentile:23.45(Nanoscience & Nanotechnology)

Journal Articles

Anomalous lattice deformation in GaN/SiC(0001) measured by high-speed ${{it in situ}}$ synchrotron X-ray diffraction

Sasaki, Takuo; Ishikawa, Fumitaro*; Takahashi, Masamitsu

Applied Physics Letters, 108(1), p.012102_1 - 012102_5, 2016/01


 Times Cited Count:2 Percentile:11.5(Physics, Applied)

Journal Articles

Direct observation of strain in InAs quantum dots and cap layer during molecular beam epitaxial growth using ${{it in situ}}$ X-ray diffraction

Shimomura, Kenichi*; Suzuki, Hidetoshi*; Sasaki, Takuo; Takahashi, Masamitsu; Oshita, Yoshio*; Kamiya, Itaru*

Journal of Applied Physics, 118(18), p.185303_1 - 185303_7, 2015/11

 Times Cited Count:7 Percentile:34.71(Physics, Applied)

Journal Articles

Mechanisms determining the structure of gold-catalyzed GaAs nanowires studied by in situ X-ray diffraction

Takahashi, Masamitsu; Kozu, Miwa*; Sasaki, Takuo; Hu, W.*

Crystal Growth & Design, 15(10), p.4979 - 4985, 2015/10

 Times Cited Count:12 Percentile:70.9(Chemistry, Multidisciplinary)

Journal Articles

Strain analysis of III-V epitaxial growth by ${{it in situ}}$ synchrotron X-ray diffraction

Sasaki, Takuo; Takahashi, Masamitsu

Nihon Kessho Seicho Gakkai-Shi, 42(3), p.210 - 217, 2015/10


Journal Articles

Journal Articles

${it In situ}$ three-dimensional X-ray reciprocal-space mapping of InGaAs multilayer structures grown on GaAs(001) by MBE

Sasaki, Takuo; Takahashi, Masamitsu; Suzuki, Hidetoshi*; Oshita, Yoshio*; Yamaguchi, Masafumi*

Journal of Crystal Growth, 425, p.13 - 15, 2015/09

 Times Cited Count:3 Percentile:32.4(Crystallography)

Journal Articles

Spontaneous formation of suboxidic coordination around Co in ferromagnetic rutile Ti$$_{0.95}$$Co$$_{0.05}$$O$$_2$$ film

Hu, W.*; Hayashi, Koichi*; Fukumura, Tomoteru*; Akagi, Kazuto*; Tsukada, Masaru*; Happo, Naohisa*; Hosokawa, Shinya*; Owada, Kenji; Takahashi, Masamitsu; Suzuki, Motohiro*; et al.

Applied Physics Letters, 106(22), p.222403_1 - 222403_5, 2015/06

 Times Cited Count:35 Percentile:82.69(Physics, Applied)

Journal Articles

Role of liquid indium in the structural purity of wurtzite InAs nanowires that grow on Si(111)

Biermanns, A.*; Dimakis, E.*; Davydok, A.*; Sasaki, Takuo; Geelhaar, L.*; Takahashi, Masamitsu; Pietsch, U.*

Nano Letters, 14(12), p.6878 - 6883, 2014/12

 Times Cited Count:26 Percentile:75.28(Chemistry, Multidisciplinary)

Journal Articles

Present state of TEM-SXES analysis and its application to SEM aiming chemical analysis of bulk materials

Terauchi, Masami*; Takahashi, Hideyuki*; Handa, Nobuo*; Murano, Takanori*; Koike, Masato; Imazono, Takashi; Koeda, Masaru*; Nagano, Tetsuya*; Sasai, Hiroyuki*; Oue, Yuki*; et al.

Microscopy and Microanalysis, 20(Suppl.3), p.682 - 683, 2014/08

X-rays originate form electronic transitions from valence bands (VB, bonding electron states) to inner-shell electron levels inform us energy states of bonding electrons. We have developed the SXES spectrometers attaching to TEM, EPMA, and SEM. A spectrometer has an energy range of 50-4000 eV by using four varied-line-spacing gratings. Applications of TEM-SXES instrument to C$$_{60}$$ have revealed characteristic energy distribution of bonding electrons. Carbon K-emission spectra of C $$_{60}$$ crystals showed that both the peak structures in $$pi$$- and $$sigma$$-bands and the characteristic dip structure between the $$pi$$- and $$sigma$$-bonding states in monomer-C$$_{60}$$ disappear in the most polymerized-C$$_{60}$$ crystals. Bulk specimens were examined by applying SXES to a SEM. Al L-emission spectra of intermetallic compounds of Al$$_{2}$$Au, AlCo, and aluminum showed different intensity distributions due to different band structures originating from different crystal structures.

Journal Articles

Exciting possibilities of soft X-ray emission spectroscopy as chemical state analysis in EPMA and FESEM

Takahashi, Hideyuki*; Handa, Nobuo*; Murano, Takanori*; Terauchi, Masami*; Koike, Masato; Kawachi, Tetsuya; Imazono, Takashi; Hasegawa, Noboru; Koeda, Masaru*; Nagano, Tetsuya*; et al.

Microscopy and Microanalysis, 20(Suppl.3), p.684 - 685, 2014/08

A novel wavelength dispersive soft X-ray emission spectrometer (SXES) having a X-ray energy range of 50-210 eV has been developed. One feature is that the SXES is parallel detection of the signals so that it can be used like a conventional energy dispersive spectrometer. The other is a high energy resolution, which is about 0.2 eV at Al-L comparable to those revealed by XPS and EELS. These features enable us to obtain meaningful information about chemical bonding in various bulk samples. The SXES can detect Li-K emission spectrum. In the case of an anode electrode of a lithium ion battery (LIB), two types of lithium peaks are observed: one lower energy peak at 50 eV and the other higher energy peak at 54 eV. It was found that the former peak corresponds to the amount of charging, whereas the latter corresponds to the metallic state of lithium.

Journal Articles

Application of capillary electrophoresis with laser-induced fluorescence detection for the determination of trace neodymium in spent nuclear fuel using complexation with an emissive macrocyclic polyaminocarboxylate probe

Haraga, Tomoko; Saito, Shingo*; Sato, Yoshiyuki; Asai, Shiho; Hanzawa, Yukiko; Hoshino, Hitoshi*; Shibukawa, Masami*; Ishimori, Kenichiro; Takahashi, Kuniaki

Analytical Sciences, 30(7), p.773 - 776, 2014/07

 Times Cited Count:6 Percentile:24.54(Chemistry, Analytical)

A simple and rapid method with low radiation exposure risk was developed for the determination of neodymium in spent nuclear fuel by CE with LIF detection using a fluorescent ligand having a macrocyclic hexadentate polyaminocarboxylate structure. The concentration of Nd(III) in a spent nuclear fuel sample was determined with no interference from various matrix elements, including lanthanides and uranium (at a 200-fold excess), with 92 $$pm$$ 3% recovery. This is due to method's high resolution based on establishing a ternary complex equilibrium during migration in which the hydroxyl ion plays an auxiliary role.

Journal Articles

Chemical state information of bulk specimens obtained by SEM-based soft-X-ray emission spectrometry

Terauchi, Masami*; Koshiya, Shogo*; Sato, Futami*; Takahashi, Hideyuki*; Handa, Nobuo*; Murano, Takanori*; Koike, Masato; Imazono, Takashi; Koeda, Masaru*; Nagano, Tetsuya*; et al.

Microscopy and Microanalysis, 20(3), p.692 - 697, 2014/06

 Times Cited Count:25 Percentile:88.29(Materials Science, Multidisciplinary)

Electron beam induced soft-X-ray emission spectroscopy (SXES) by using a grating spectrometer has been introduced to a conventional scanning electron microscope (SEM) for characterizing desired specimen areas of bulk materials. The spectrometer was designed as a grazing-incidence flat-field optics by using aberration corrected (varied-line-spacing) gratings and a multi-channel-plate detector combined with a charge-coupled-device camera, which has already applied for a transmission electron microscope. The best resolution was confirmed as 0.13 eV at Mg L-emission (50 eV), which value is comparable to that of recent dedicated electron energy-loss spectroscopy instruments. This SXES-SEM instrument presents density of states of simple metals of bulk Mg and Li. Apparent band structure effects have been observed in Si L-emission of Si-wafer, P L-emission of GaP-wafer, and Al L-emissions of intermetallic compounds of AlCo, AlPd, Al$$_{2}$$Pt, and Al$$_{2}$$Au.

Journal Articles

Anomalous temperature dependence of current-induced torques in CoFeB/MgO heterostructures with Ta-based underlayers

Kim, J.*; Sinha, J.*; Mitani, Seiji*; Hayashi, Masamitsu*; Takahashi, Saburo*; Maekawa, Sadamichi; Yamanouchi, Michihiko*; Ohno, Hideo*

Physical Review B, 89(17), p.174424_1 - 174424_8, 2014/05

 Times Cited Count:84 Percentile:94.46(Materials Science, Multidisciplinary)

We have studied the underlayer thickness and temperature dependencies of the current-induced effective field in CoFeB/MgO heterostructures with Ta-based underlayers. The underlayer thickness at which the effective field saturates is found to be different between the two orthogonal components of the effective field; i.e., the dampinglike term tends to saturate at a smaller underlayer thickness than the fieldlike term. For large underlayer thickness films in which the effective field saturates, we find that the measurement temperature significantly influences the size of the effective field. A striking difference is found in the temperature dependence of the two components: the dampinglike term decreases whereas the fieldlike term increases with increasing temperature. Using a simple spin diffusion-spin transfer model, we find that all of these results can be accounted for provided the real and imaginary parts of an effective spin mixing conductance are negative. These results imply that either spin transport in this system is different from conventional metallic interfaces or effects other than spin diffusion into the magnetic layer need to be taken into account in order to model the system accurately.

Journal Articles

Acute and obtuse rhombohedrons in the local structures of relaxor ferroelectric Pb(Mg$$_{1/3}$$Nb$$_{2/3}$$)O$$_3$$

Hu, W.*; Hayashi, Koichi*; Owada, Kenji; Chen, J.*; Happo, Naohisa*; Hosokawa, Shinya*; Takahashi, Masamitsu; Bokov, A.*; Ye, Z.-G*

Physical Review B, 89(14), p.140103_1 - 140103_5, 2014/04

 Times Cited Count:40 Percentile:85.21(Materials Science, Multidisciplinary)

Journal Articles

Monitoring of airborne $$^{14}$$C discharge at RI facilities; A Comparison of collection and oxidation methods

Ueno, Yumi; Koarashi, Jun; Iwai, Yasunori; Sato, Junya; Takahashi, Teruhiko; Sawahata, Katsunori; Sekita, Tsutomu; Kobayashi, Makoto; Tsunoda, Masahiko; Kikuchi, Masamitsu

Hoken Butsuri, 49(1), p.39 - 44, 2014/03

The Japan Atomic Energy Agency has conducted a monthly monitoring of airborne $$^{14}$$C discharge at the forth research building (RI facility) of the Tokai Research and Development Center. In the current monitoring, $$^{14}$$C, which exists in various chemical forms in airborne effluent, is converted into $$^{14}$$CO$$_{2}$$ with CuO catalyst and then collected using monoethanolamine (MEA) as CO$$_{2}$$ absorbent. However, this collection method has some issues on safety management because the CuO catalyst requires a high heating temperature (600$$^{circ}$$C) to ensure a high oxidation efficiency and the MEA is specified as a poisonous and deleterious substance. To establish a safer, manageable and reliable method for monitoring airborne $$^{14}$$C discharge, we examined collection methods that use different CO$$_{2}$$ absorbents (MEA and Carbo-Sorb E) and oxidation catalysts (CuO, Pt/Alumina and Pd/ZrO$$_{2}$$). The results showed 100% CO$$_{2}$$ collection efficiency of MEA during a 30-day sampling period under the condition tested. In contrast, Carbo-Sorb E was found to be unsuitable for the monthly-long CO$$_{2}$$ collection because of its high volatile nature. Among the oxidation catalysts, the Pd/ZrO$$_{2}$$ showed the highest oxidation efficiency for CH$$_{4}$$ at a lower temperature.

Journal Articles

Defect characterization in compositionally graded InGaAs layers on GaAs (001) grown by MBE

Sasaki, Takuo; Norman, A. G.*; Romero, M. J.*; Al-Jassim, M. M.*; Takahashi, Masamitsu; Kojima, Nobuaki*; Oshita, Yoshio*; Yamaguchi, Masafumi*

Physica Status Solidi (C), 10(11), p.1640 - 1643, 2013/11

 Times Cited Count:4 Percentile:85.38

Journal Articles

Real-time observation of crystallographic tilting InGaAs layers on GaAs offcut substrates

Nishi, Toshiaki*; Sasaki, Takuo; Ikeda, Kazuma*; Suzuki, Hidetoshi*; Takahashi, Masamitsu; Shimomura, Kenichi*; Kojima, Nobuaki*; Oshita, Yoshio*; Yamaguchi, Masafumi*

AIP Conference Proceedings 1556, p.14 - 17, 2013/09

 Times Cited Count:0 Percentile:0.01

255 (Records 1-20 displayed on this page)