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Kawasuso, Atsuo; Yabuuchi, Atsushi; Maekawa, Masaki; Hasegawa, Shigehiko*; Zhou, Y.-K.*; Asahi, Hajime*
JAEA-Review 2010-065, JAEA Takasaki Annual Report 2009, P. 148, 2011/01
Vacancy defects in GaCrN grown by molecular beam epitaxy have been characterized by energy variable positron beam. Both positron lifetime and the Doppler broadening of annihilation 
ray (DBAR) measurements show that the GaCrN film grown at low 540
C contains vacancy defects. The observed vacancy defects are identified as eight-vacancy clusters. Although the Si doping reduces such vacancy clusters probably due to the occupation of Ga sites, another type of vacancy defects still survives. From the detailed theoretical calculation, the residual vacancy defects are attributable to SiGa-VN complexes.
Kondo, Takafumi*; Yang, J.*; Kan, Koichi*; Yoshida, Yoichi*; Shibata, Hiromi*; Taguchi, Mitsumasa; Kojima, Takuji
JAEA-Review 2007-060, JAEA Takasaki Annual Report 2006, P. 160, 2008/03
no abstracts in English
Seki, Shuhei*; Tsukuda, Satoshi*; Tagawa, Seiichi*; Sugimoto, Masaki; Sato, Takahiro; Oikawa, Masakazu*; Sakai, Takuro
JAEA-Review 2006-042, JAEA Takasaki Annual Report 2005, P. 145, 2007/02
no abstracts in English
Tsukuda, Satoshi*; Seki, Shu*; Sugimoto, Masaki; Tagawa, Seiichi*
Journal of Physical Chemistry B, 110(39), p.19319 - 19322, 2006/10
Times Cited Count：23 Percentile：50.75(Chemistry, Physical)no abstracts in English
Seki, Shu*; Tsukuda, Satoshi*; Tagawa, Seiichi*; Sugimoto, Masaki
Macromolecules, 39(21), p.7446 - 7450, 2006/10
Times Cited Count：15 Percentile：42.69(Polymer Science)no abstracts in English
Yoshida, Yoichi*; Yang, J.*; Kondo, Takafumi*; Seki, Shuhei*; Kozawa, Takahiro*; Tagawa, Seiichi*; Shibata, Hiromi*; Taguchi, Mitsumasa; Kojima, Takuji; Namba, Hideki
JAEA-Review 2005-001, TIARA Annual Report 2004, p.183 - 185, 2006/01
A heavy-ion-pulse radiolysis technology was developed using a single-photon-counting system. In the system, the ion beam was injected a thin scintillator before irradiating the sample. The light emitted from the scintillator by the ion irradiation was used as analyzing source to detect the absorption of primary species in water. Measurement of time-dependent absorption of hydrated electrons in water was achieved using the system, which demonstrates the usefulness of this technique.
Yoshida, Yoichi*; Yang, J.*; Saeki, Akinori*; Tagawa, Seiichi*; Shibata, Hiromi*; Namba, Hideki; Kojima, Takuji; Taguchi, Mitsumasa
JAERI-Review 2004-025, TIARA Annual Report 2003, p.143 - 144, 2004/11
no abstracts in English
Tsukuda, Satoshi*; Seki, Shuhei*; Tagawa, Seiichi*; Sugimoto, Masaki; Idesaki, Akira; Tanaka, Shigeru; Oshima, Akihiro*
Journal of Physical Chemistry B, 108(11), p.3407 - 3409, 2004/03
Times Cited Count：51 Percentile：71.91(Chemistry, Physical)Nano-wire formation in Si-based polymer thin films using a heavy ion beam is discussed in terms of energy density deposition along ion tracks. Gelation of the polymer along the ion track results in cross-linking to produce nano-wires with size and number density controllable by selecting appropriate ion beam characteristics and polymer materials. Ion bombardment of polycarbosilane (PCS), PCS-polyvinylsilane blend polymer, and polymethylphenylsilane produces nano-wires with radii of 30 nm depending on the type of ion beam. The difference in size is shown to be related to the efficiency of the cross-linking reaction considering the deposited energy distribution along the ion tracks.
Yoshida, Yoichi*; Yang, J.*; Seki, Shuhei*; Saeki, Akinori*; Tagawa, Seiichi*; Shibata, Hiromi*; Taguchi, Mitsumasa; Kojima, Takuji; Namba, Hideki
JAERI-Review 2003-033, TIARA Annual Report 2002, p.145 - 146, 2003/11
no abstracts in English
Kondo, Takafumi*; Yang, J.*; Kan, Koichi*; Yoshida, Yoichi*; Shibata, Hiromi*; Taguchi, Mitsumasa; Kojima, Takuji
no journal, ,
no abstracts in English
Sugimoto, Masaki; Yoshikawa, Masahito; Tsukuda, Satoshi*; Seki, Shuhei*; Tagawa, Seiichi*
no journal, ,
We have succeeded in synthesizing the silicon carbide (SiC) nanowires from polycarbosilane (PCS) using MeV-order heavy-ion beam irradiation technique. PCS was crosslinked along ion tracks of nano-size in diameter through the whole thickness of PCS thin film. Nanowires were developed on the surface of the substrate by dissolution and washing away of uncrosslinked polymer by solvent. Subsequent pyrolysis converted polymeric into inorganic SiC nanowires. The diameter of nanowires was depended on LET (liner energy transfer), molecular weight and cross-linking efficiency of PCS.
Kondo, Takafumi*; Yang, J.*; Kan, Koichi*; Yoshida, Yoichi*; Taguchi, Mitsumasa; Kojima, Takuji; Shibata, Hiromi*
no journal, ,
no abstracts in English
Taguchi, Mitsumasa; Kimura, Atsushi; Kondo, Takafumi*; Yang, J.*; Yoshida, Yoichi*; Hirota, Koichi
no journal, ,
no abstracts in English
Sugimoto, Masaki; Yoshikawa, Masahito; Seki, Shuhei*; Tagawa, Seiichi*
no journal, ,
no abstracts in English
Kawasuso, Atsuo; Yabuuchi, Atsushi; Maekawa, Masaki; Hasegawa, Shigehiko*; Zhou, Y.-K.*; Asahi, Hajime*
no journal, ,
no abstracts in English
Nagaishi, Ryuji; Aoyagi, Noboru; Taguchi, Mitsumasa; Kondo, Takafumi*; Yang, J.*; Yoshida, Yoichi*
no journal, ,
Reaction behaviors of radiolysis products in mixtures of different ionic liquids containing thiocyanate anion were studied by using pulse radiolysis technique. Dimer radical ion of thiocyanate in the visible range and electron in the near-infrared range were observed in the ns-pulse radiolysis to measure their yields and reactions. The formations of products increased with increasing the thiocyanate concentration, regardless of kinds of cations in the mixture. The products were also observed in the ps-pulse radiolysis to clarify their formation pathways.
Nagaishi, Ryuji; Kondo, Takafumi*; Aoyagi, Noboru; Taguchi, Mitsumasa; Yang, J.*; Yoshida, Yoichi*
no journal, ,
Reaction behaviors of radiolysis products in mixtures of different ionic liquids containing thiocyanate anion were studied by using pulse radiolysis technique. Dimer radical ion of thiocyanate in the visible range and electron in the near-infrared range were observed in the ns-pulse radiolysis to measure their yields and reactions. The formations of products increased with increasing the thiocyanate concentration, regardless of kinds of cations in the mixture. The products were also observed in the ps-pulse radiolysis to clarify their formation pathways.
