Faculty Profiles - TORIMOTO Tsukasa

Papers - TORIMOTO Tsukasa

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Fabrication of Transition Metal Oxide Nanoparticles Highly Dispersed in Ionic Liquids by Sputter Deposition Reviewed

Toshimasa Suzuki, Shushi Suzuki, Yousuke Tomita, Ken-ichi Okazaki, Tamaki Shibayama, Susumu Kuwabata, and Tsukasa Torimoto*

Chem. Lett. Vol. 39 page： 1072-1074 2010.10

Palladium Nanoparticles in Ionic Liquid by Sputter Deposition as Catalysts for SuzukiMiyaura Coupling in Water Reviewed

Yoshiro Oda, Koji Hirano, Kazuki Yoshii, Susumu Kuwabata, Tsukasa Torimoto, and Masahiro Miura

Chem. Lett. Vol. 39 ( 10 ) page： 1069-1071 2010.10

Nanosize-Controlled Syntheses of Indium Metal Particles and Hollow Indium Oxide Particles via the Sputter Deposition Technique in Ionic Liquids Reviewed

Toshimasa Suzuki, Ken-ichi Okazaki, Shushi Suzuki, Tamaki Shibayama, Susumu Kuwabata, and Tsukasa Torimoto

Chem. Mater. Vol. 22 ( 18 ) page： 5209-5215 2010.9

Oxygen Reduction Catalytic Ability of Platinum Nanoparticles Prepared by Room-temperature Ionic Liquid-sputtering Method Reviewed

Tetsuya Tsudaa, Kazuki Yoshiia, Tsukasa Torimoto, Susumu Kuwabata

J. Power Sources Vol. 195 ( 18 ) page： 5980-5985 2010.9

Preparation and Photoelectrochemical Properties of Densely Immobilized Cu2ZnSnS4 Nanoparticle Films Reviewed

Tatsuya Kameyama, Takaaki Osaki, Ken-ichi Okazaki, Tamaki Shibayama, Akihiko Kudo, Susumu Kuwabata and Tsukasa Torimoto

J. Mater. Chem. Vol. 20 ( 25 ) page： 5319-5324 2010.7

Immobilization of ZnS-AgInS2 Solid Solution Nanoparticles on ZnO Rod Array Electrodes and Their Photoresponse with Visible Light Irradiation Reviewed

Tetsuya Sasamura, Ken-ichi Okazaki, Ryuta Tsunoda, Akihiko Kudo, Susumu Kuwabata, and Tsukasa Torimoto

Chem. Lett. Vol. 39 page： 619-621 2010.6

Sensing of Protein Adsorption with a Porous Bulk Composite Comprising Silver Nanoparticles Deposited on Hydroxyapatite Reviewed

Chikara Ohtsuki, Yuji Ichikawa, Hiroyuki Shibata, Giichiro Kawachi, Tsukasa Torimoto, Shin-ichi Ogata

J. Mater. Sci.: Mater. Med. Vol. 21 ( 4 ) page： 1225-1232 2010.4

半導体ナノ粒子の組織化と光機能: 量子ドット配列制御による高機能性材料の創製 Invited Reviewed

亀山達矢　,鳥本　司

化学と工業 Vol. 63 ( 4 ) page： 327-329 2010.4

Remarkable Photoluminescence Enhancement of ZnS-AgInS2 Solid Solution Nanoparticles by Postsynthesis Treatment Reviewed

Tsukasa Torimoto,* Shoji Ogawa, Tomohiro Adachi, Tatsuya Kameyama, Ken-ichi Okazaki, Tamaki Shibayama, Akihiko Kudo and Susumu Kuwabata

Chem. Commun. Vol. 46 ( 12 ) page： 2082-2084 2010.3

New Frontiers in Materials Science Opened by Ionic Liquids Invited Reviewed

Tsukasa Torimoto, Tetsuya Tsuda, Ken-ichi Okazaki, Susumu Kuwabata

Adv. Mater. Vol. 22 ( 11 ) page： 1196-1221 2010.3

Size Control and Immobilization of Gold Nanoparticles Stabilized in an Ionic Liquid on Glass Substrates for Plasmonic Applications Reviewed

Tatsuya Kameyama, Yumi Ohno, Takashi Kurimoto, Ken-ichi Okazaki, Taro Uematsu, Susumu Kuwabata and Tsukasa Torimoto

Phys. Chem. Chem. Phys Vol. 12 ( 8 ) page： 1804–1811 2010.2

Studies on Reaction Conditions for Size-selective Photoetching of Cadmium Telluride Nanocrystals Reviewed

Taro Uematsu, Tsukasa Torimoto, Susumu Kuwabata

Electrochemistry Vol. 78 ( 2 ) page： 170-174 2010.2

A Facile Synthesis of AuAg Alloy Nanoparticles Using a Chemical Reaction Induced by Sputter Deposition of Metal onto Ionic Liquids Reviewed

Toshimasa Suzuki, Ken-ichi Okazaki, Tomonori Kiyama, Susumu Kuwabata, and Tsukasa Torimoto

Electrochemistry Vol. 77 page： 636-638 2009.8

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

Sputter deposition of silver (Ag) onto an ionic liquid (IL) produced Ag nanoparticles whose size was varied greatly dependent on the sputtering conditions. Change in discharge current from 10 to 40 mA increased Ag particle size from 5.7 to 11 nm, though prolongation of sputtering time simply caused a higher concentration of Ag nanoparticles in IL without change in their size. Sputter deposition of Ag onto IL solutions containing HAuCl4 resulted in the appearance of a single surface plasmon resonance peak in the absorption spectra of the resulting solution, and their peak position was red-shifted with an increase in the concentration of HAuCl4. The obtained results clearly indicated that Ag metal species sputter-deposited in IL can reduce HAuCl4 to give AuAg alloy nanoparticles and that their chemical composition varies depending on the initial concentration of HAuCl4.

Electrocatalytic Activity of Platinum Nanoparticles Synthesized by Room-Temperature Ionic Liquid−Sputtering Method Reviewed

Tetsuya Tsusa, Takasuke Kurihara, Yasunori Hoshino, Tomonori Kiyama, Ken-ichi Ken-ichi Okazaki, Tsukasa Torimoto, and Susumu Kuwabata

Electrochemistry Vol. 77 page： 693-695 2009.8

Language：English Publishing type：Research paper (scientific journal)

Platinum (Pt) nanoparticles were synthesized with room-temperature ionic liquid (RTIL)−sputtering method under
dry N2 or Ar atmosphere. The resulting Pt nanoparticles were well-dispersed in trimethyl-n-propylammonium
bis((trifluoromethyl)sulfonyl)amide RTIL without any additive like dispersant. Electrocatalytic activity of the Pt nanoparticles embedded on a glassy carbon electrode (GCE) toward oxygen reduction reaction was examined. It
was then found that the catalytic activity increases with increment of heat temperature for embedding the Pt
nanoparticles onto GCE if the nanoparticles are synthesized under Ar atmosphere.

Tuning of the Fluorescence Wavelength of CdTe Quantum Dots with 2 nm Resolution by Size-selective Photoetching Reviewed

T. Uematsu , H. Kitajima, T. Kohma, T. Torimoto, Y. Tachibana, and S. Kuwabata

Nanotechnology Vol. 20 page： 215302 2009.5

*Electrochemical Deposition of Gold Frame Structure on Silver Nanocubes Reviewed

Ken-ichi Okazaki, Jun-ichi Yasui, and Tsukasa Torimoto

Chem. Commun. page： 2917-2919 2009.4

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

Au-framed Ag nanocubes were prepared by site-selective electrochemical deposition of Au onto the edges and vertices of Ag nanocubes modified with a self-assembled monolayer (SAM) of 1-octanethiol, and further chemical etching of the Ag cubes used as a template produced Au nanoframes.

Stacked-Structure-Dependent Photoelectrochemical Properties of CdS Nanoparticle / Layered Double Hydroxide (LDH) Nanosheet Multilayer Films Prepared by Layer-by-layer Accumulation

Tatsuya Kameyama, Ken-ichi Okazaki, Katsuhiko Takagi, and Tsukasa Torimoto

Phys. Chem. Chem. Phys. Vol. 11 page： 5369-5376 2009.4

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

Inorganic multilayer films were prepared by layer-by-layer accumulation of positively charged layered double hydroxide (LDH) nanosheets and negatively charged CdS nanoparticles of different sizes. Nanoparticles were densely immobilized on LDH sheets to form a monolayer
without coalescence into larger particles. The absorbance and photoluminescence intensity of immobilized CdS particles were enlarged with an increase in the accumulation number of the film. Hybrid films produced by accumulation of both monolayers of CdS particles (diameter: 5 nm) and those of smaller CdS particles (2.1 nm) exhibited characteristic photoluminescence spectra
indicating the efficient energy transfer of photogenerated excitons from nanoparticle layers of smaller CdS particles to those of larger ones. LDH/CdS multilayers deposited on an F-doped SnO2 (FTO) electrode behaved as an n-type semiconductor photoelectrode in an acetonitrile
solution regardless of the size of the CdS particles immobilized, but their efficiency for photocurrent generation was greatly dependent on the stacked structure of the films. Accumulation of CdS particles of 2.1 nm in diameter on pre-coated LDH/CdS layers of 5 nm-sized CdS particles on FTO remarkably enhanced the photocurrent intensity in comparison to that in the case of accumulation of these two kinds of CdS particles in the opposite sequence. These observations can be explained by photoinduced electron transfer and energy transfer along
with the band gap gradient in the films.

Thermally Induced Self-assembly of Gold Nanoparticles Sputter-deposited in Ionic Liquids on Highly Ordered Pyrolytic Graphite Surfaces Reviewed

Ken-ichi Okazaki, Tomonori Kiyama, Toshimasa Suzuki, Susumu Kuwabata, and Tsukasa Torimoto

Chem. Lett. Vol. 38 page： 330-331 2009.3

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

Gold nanoparticles sputter-deposited in ionic liquids were
densely immobilized on the surface of highly ordered pyrolytic graphite (HOPG) by spreading the ionic liquid containing Au nanoparticles on HOPG and then heating. The density of immobilized Au particles was greatly dependent on the kind of ionic liquid used, and their size was controlled by the heating temperature. The resulting nanoparticle films were stable and electrochemically
active for oxygen reduction.

Hybridization of Silver Nanoparticles on Hydroxyapatite in an Aqueous Solution Reviewed

Yuji Ichikawa, Shin-ichi Ogata, Tsukasa Torimoto, Giichiro Kawachi, Koichi Kikuta and Chikara Ohtsuki

J. Ceram. Soc. Jpn. Vol. 117 page： 294-298 2009.3

Small-Angle X-ray Scattering Study of Au Nanoparticles Dispersed in the Ionic Liquids 1-Alkyl-3-methylimidazolium Tetrafluoroborate Reviewed

Yoshikiyo Hatakeyama, Maimi Okamoto, Tsukasa Torimoto, Susumu Kuwabata, and Keiko Nishikawa

J. Phys. Chem. C Vol. 113 page： 3917-3922 2009.2

Language：English Publishing type：Research paper (scientific journal)

It was recently discovered that the sputter deposition of metal onto the surface of an ionic liquid generates nanoparticles in the liquid with no additional stabilizing agents. We performed small-angle X-ray scattering (SAXS) experiments to investigate the structure of Au nanoparticles synthesized by this method and to reveal the properties of the ionic liquid that affect the formation process. For a systematic study of these properties, we selected imidazolium-based ionic liquids with different alkyl chain lengths fixing the anion BF4-. The Au concentration dependence for the formation of the nanoparticles was also studied. The SAXS results revealed
that Au nanoparticles with 0.75-3.5 nm diameter were generated under the experimental conditions and that the particle size was relatively uniform for a fixed condition. The results demonstrated that the particle size
depends on the type of ionic liquid and on the concentration if the ionic liquid is fixed. Integrating the
experimental results, it was concluded that the surface tension and viscosity of the ionic liquid played important
roles in conjunction with the Au concentration. It was interpreted that the surface tension influences the initial formation process of nanoparticles on the surface of an ionic liquid, and the viscosity affects the aggregation process during the dispersion of the Au particles from the surface into the liquid.

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Papers - TORIMOTO Tsukasa