Organization
Undergraduate School School of Science and Technology Professor
Title
Professor
External link
WATANABE TOMOAKI
Scopus Paper Info
Paper Count: 119 Citation Count: 4647 h-index: 26
Google Scholar Information (Citations per year)
Degree
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博士（工学） ( 東京工業大学 )
Research Areas
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Nanotechnology/Materials / Inorganic materials
Education
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Tokyo Institute of Technology Graduate School, Division of Integrated Science and Engineering
- 2001.3
Country/Region： Japan
Research History
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Professor
2012.4
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Associate Professor
2007.4 - 2011.3
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Lecturer
2005.4 - 2007.3
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Research Assistant
2002.6 - 2005.3
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Researcher
2001.4 - 2002.6
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Special researcher of the Japan Society for the Promotion of Science
1999.1 - 2001.3
Professional Memberships
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日本化学会
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日本セラミックス協会
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アメリカＭＲＳ会員
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アメリカセラミックス協会会員
Papers
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Effects of hydrophilic groups of polymer on change in hydrogen-bonding structure of water in hydrogels during dehydration Reviewed
Hitoshi Sugiyama, Ken ichi Katoh, Naoko Sekine, Yurina Sekine, Tomoaki Watanabe, Tomoko Ikeda-Fukazawa
Chemical Physics Letters 856 2024.12
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Growth of submillimeter SrTaO<inf>2</inf>N single crystals by an NH<inf>3</inf>-assisted SrCl<inf>2</inf> flux method
Ginji Harada, Ryosuke Sinmyo, Shuhou Maitani, Tomoaki Watanabe, Mirabbos Hojamberdiev, Kitaru Suzuki, Hajime Wagata
Dalton Transactions 2023
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Photocatalytic solar hydrogen production from water on a 100-m2 scale International journal
Hiroshi Nishiyama, Taro Yamada, Mamiko Nakabayashi, Yoshiki Maehara, Masaharu Yamaguchi, Yasuko Kuromiya, Yoshie Nagatsuma, Hiromasa Tokudome, Seiji Akiyama, Tomoaki Watanabe, Ryoichi Narushima, Sayuri Okunaka, Naoya Shibata, Tsuyoshi Takata, Takashi Hisatomi, Kazunari Domen
Nature 598 ( 7880 ) 304 - 307 2021.10
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Spectroelectrochemical Evaluation of a ZnO Optically Transparent Electrode Prepared by the Spin-spray Technique Reviewed
Takuya Okazaki, Hiroaki Taniguchi, Hajime Wagata, Mizuki Ito, Hideki Kuramitz, Tomoaki Watanabe
Electroanalysis 2020
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Oxysulfide photocatalyst for visible-light-driven overall water splitting
Qian Wang, Mamiko Nakabayashi, Takashi Hisatomi, Song Sun, Seiji Akiyama, Zheng Wang, Zhenhua Pan, Xiong Xiao, Tomoaki Watanabe, Taro Yamada, Naoya Shibata, Tsuyoshi Takata, Kazunari Domen
NATURE MATERIALS 18 ( 8 ) 827 - + 2019.8
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One-dimensional Anisotropic Electronic States in Needle-shaped La <inf>5</inf> Ti <inf>2</inf> CuS <inf>5</inf> O <inf>7</inf> Single Crystals Grown in Molten Salt in Bridgman Furnace Reviewed
Motoki Iwase, Mamiko Nakabayashi, Naoya Shibata, Hiroyuki Matsuzaki, Hisayoshi Kobayashi, Taro Yamada, Kazunari Domen, Tomoaki Watanabe
Crystal Growth and Design 19 ( 4 ) 2419 - 2427 2019.4
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Upscaling of Temperature-Sensitive Particle Photocatalyst Electrodes: Fully Ambient and Scalable Roll-Press Fabrication of Ta<inf>3</inf>N<inf>5</inf> Photoelectrodes on Metal Substrate Reviewed
Xiong Xiao, Motoki Iwase, Ge Yin, Mamiko Nakabayashi, Tomohiro Higashi, Naoya Shibata, Kazunari Domen, Tomoaki Watanabe
ACS Sustainable Chemistry and Engineering 7 ( 24 ) 19407 - 19414 2019
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Low-temperature Synthesis of BaTaO2N via the Flux Method Using NaNH2 Reviewed
Yuki Setsuda, Yuki Maruyama, Chihiro Izawa, Tomoaki Watanabe
CHEMISTRY LETTERS 46 ( 7 ) 987 - 989 2017.7
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Direct Fabrication of a CuFeO2/Fe Photocathode for Solar Hydrogen Production by Hydrothermal Method Reviewed
Mizuki Ito, Chihiro Izawa, Tomoaki Watanabe
CHEMISTRY LETTERS 46 ( 6 ) 814 - 816 2017.6
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Molten salt flux synthesis of La5Ti2CuS5O7 towards elongated single crystallites Reviewed
Motoki Iwase, Mamiko Nakabayashi, Naoya Shibata, Chihiro Izawa, Masao Katayama, Taro Yamada, Yasunobu Inoue, Kazunari Domen, Tomoaki Watanabe
JAPANESE JOURNAL OF APPLIED PHYSICS 56 ( 5 ) 055503 2017.5
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Chemical State of Nitrogen in Nitrogen-Doped Hydroxyapatite Ceramics with Enhanced Bioactivity Reviewed
Ryota Namiki, Takuya Suyama, Chihiro Izawa, Tomoko Ikeda-Fukazawa, Michiyo Honda, Tomoaki Watanabe, Mamoru Aizawa
Key Engineering Materials 720 215 - 218 2017.1
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Low-temperature synthesis of BaTaO2N by an ammonothermal method Reviewed
Tatsuro Toshima, Kazuhisa Kishida, Yuki Maruyama, Tomoaki Watanabe
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN 125 ( 8 ) 643 - 647 2017
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Formation of bioactive N-doped TiO2 on Ti with visible light-induced antibacterial activity using NaOH, hot water, and subsequent ammonia atmospheric heat treatment Reviewed
Masakazu Kawashita, Naoko Endo, Tomoaki Watanabe, Toshiki Miyazaki, Maiko Furuya, Kotoe Yokota, Yuki Abiko, Hiroyasu Kanetaka, Nobuhiro Takahashi
COLLOIDS AND SURFACES B-BIOINTERFACES 145 285 - 290 2016.9
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Low-temperature synthesis of CaAlSiN3:Ce3+ using the ammonothermal method Reviewed
Yuki Maruyama, Tomoaki Watanabe
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN 124 ( 1 ) 66 - 69 2016.1
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Synthesis of a new scheelite-type Eu3+-doped Gd2W2O9 red light emitting phosphor by the polymerized complex method Reviewed
Masayuki Inomata, Kazuhisa Kishida, Yuki Maruyama, Tomoaki Watanabe
SOLID STATE SCIENCES 48 251 - 255 2015.10
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Nitrogen-doped ZnO Rods Synthesized from an Ammine-Hydroxo Zinc Complex Reviewed
Taiki Ihara, Ken-ichi Katsumata, Tomoaki Watanabe, Kiyoshi Okada, Nobuhiro Matsushita
CHEMISTRY LETTERS 44 ( 5 ) 651 - 653 2015.5
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Direct Fabrication of LaTiO2N Photoanode for Visible-light-driven Water Splitting Reviewed
Chihiro Izawa, Tomoaki Watanabe
CHEMISTRY LETTERS 43 ( 9 ) 1441 - 1443 2014.9
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Photocatalytic properties of lanthanide tungstates Ln(2)W(2)O(9) (Ln = La, Pr, Nd, Sm, and Gd) Reviewed
Kazuhisa Kishida, Tomoaki Watanabe
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS 75 ( 4 ) 486 - 490 2014.4
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Morphological change and enhanced photocatalytic activity of tantalum nitride (Ta3N5) by ammonothermal treatment with mineralizer Reviewed
Kazuhisa Kishida, Tomoaki Watanabe
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN 122 ( 1422 ) 156 - 160 2014.2
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Low temperature ammonothermal synthesis of europium-doped SrAlSiN3: effect of mineralizers Reviewed
Kazumichi Nonaka, Kazuhisa Kishida, Chihiro Izawa, Tomoaki Watanabe
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN 122 ( 1421 ) 17 - 20 2014.1
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Fabrication of heterostructured α-Fe2O3 / ZnO film for photoelectrode by aqueous solution process Reviewed
J. S. Hong, T. Watanabe, H. Wagata, K. Katsumata, K. Okada, N. Matsushita
Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy 61 ( 51 ) S324 - S326 2014
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Effects of surface roughness and chemical species on hydrophilicity of anodized film on Ti-6AL-4V formed at a low current density
Phanawan Whangdee, Siritida Chukasorn, Viritpon Srimaneepong, Tomoaki Watanabe, Dujreutai Pongkao Kashima
Advanced Materials Research 664 774 - 779 2013
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Low temperature ammonothermal synthesis of europium-doped SrAlSiN3 for a nitride red phosphor
Tomoaki Watanabe, Kazumichi Nonaka, JinWang Li, Kazuhisa Kishida, Masahiro Yoshimura
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN 120 ( 1407 ) 500 - 502 2012.11
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Improvement of photocatalytic activity of tantalum nitride by ammonothermal treatment at high pressure
Kazuhisa Kishida, Tomoaki Watanabe
JOURNAL OF SOLID STATE CHEMISTRY 191 15 - 18 2012.7
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Defect controlled room temperature ferromagnetism in Co-doped barium titanate nanocrystals
Sugata Ray, Yury V. Kolen'ko, Kirill A. Kovnir, Oleg I. Lebedev, Stuart Turner, Tanushree Chakraborty, Rolf Erni, Tomoaki Watanabe, Gustaaf Van Tendeloo, Masahiro Yoshimura, Mitsuru Itoh
NANOTECHNOLOGY 23 ( 2 ) 025702 2012.1
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Synthesis of BiNbO4 by the Flux Method
Yuki Maruyama, Chihiro Izawa, Tomoaki Watanabe
ISRN Materials Science 170362 2012
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Low-Temperature Synthesis of -BiTa Photocatalyst by the Flux Method
Kohei Shimada, Chihiro Izawa, Tomoaki Watanabe
ISRN Materials Science 719087 2012
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Crystallographic characterization of the crossed lamellar structure in the bivalve Meretrix lamarckii using electron beam techniques
Akiko Hayashi, Naoki Yokoo, Toshihiro Nakamura, Tomoaki Watanabe, Hiromichi Nagasawa, Toshihiro Kogure
JOURNAL OF STRUCTURAL BIOLOGY 176 ( 1 ) 91 - 96 2011.10
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Low-temperature Ammonothermal Synthesis of LaTaON2
Tomoaki Watanabe, Keisuke Tajima, JinWang Li, Nobuhiro Matsushita, Masahiro Yoshimura
CHEMISTRY LETTERS 40 ( 10 ) 1101 - 1102 2011.10
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Direct Fabrication of La2Ti2O7 Films on Titanium Metal Substrate by Hydrothermal Reaction
Chihiro Izawa, Tomoaki Watanabe
Trans. Mater. Res. Soc. Japan 36 ( 3 ) 413-416 - 416 2011
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Fabrication of a Nacre-Like Aragonite/PAA Multilayer Film on a Nacre Substrate
Akiko Hayashi, Toshihiro Nakamura, Tomoaki Watanabe
CRYSTAL GROWTH & DESIGN 10 ( 12 ) 5085 - 5091 2010.12
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Influence of the Host Phase on the Vibrational Spectra of Europium-Doped Zirconia Prepared by Hydrothermal Processing
Eva Hemmer, Kohei Soga, Tomoya Konishi, Tomoaki Watanabe, Takaaki Taniguchi, Sanjay Mathur
JOURNAL OF THE AMERICAN CERAMIC SOCIETY 93 ( 11 ) 3873 - 3879 2010.11
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Nanoscale Heterogeneities in CeO2-ZrO2 Nanocrystals Highlighted by UV-Resonant Raman Spectroscopy Reviewed
Takaaki Taniguchi, Tomoaki Watanabe, Satoshi Ichinohe, Masahiro Yoshimura, Ken-ichi Katsumata, Kiyoshi Okada, Nobuhiro Matsushita
Nanoscale ( 2 ) 1426 - 1428 2010.4
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Synthesis of Amphipathic YVO4:Eu3+ Nanophosphors by Oleate-Modified Nucleation/Hydrothermal-Growth Process
Takaaki Taniguchi, Tomoaki Watanabe, Ken-ichi Katsumata, Kiyoshi Okada, Nobuhiro Matsushita
JOURNAL OF PHYSICAL CHEMISTRY C 114 ( 9 ) 3763 - 3769 2010.3
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Crystalline arrangement and nanostructure of aragonitic crossed lamellar layers of the Meretrix lusoria shell
Akiko Hayashi, Tomoaki Watanabe, Toshihiro Nakamura
ZOOLOGY 113 ( 2 ) 125 - 130 2010.3
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Fabrication of BaTiO3 Thin Films and Microdot Patterns by Halide-Free Nonaqueous Solution Route
Hajime Wagata, Takaaki Taniguchi, Ruwan Gallage, A. K. Subramani, Naonori Sakamoto, Tomoaki Watanabe, Masahiro Yoshimura, Nobuhiro Matsushita
JOURNAL OF THE AMERICAN CERAMIC SOCIETY 93 ( 2 ) 381 - 386 2010.2
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Identifying Defects in Ceria-Based Nanocrystals by UV Resonance Raman Spectroscopy
Takaaki Taniguchi, Tomoaki Watanabe, Naota Sugiyama, A. K. Subramani, Hajime Wagata, Nobuhiro Matsushita, Masahiro Yoshimura
JOURNAL OF PHYSICAL CHEMISTRY C 113 ( 46 ) 19789 - 19793 2009.11
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High-Pressure Synthesis of Tantalum Nitride Having Orthorhombic U2S3 Type Structure
Andreas Zerr, Gerhard Miehe, Jinwang Li, Dmytro A. Dzivenko, Vadim K. Bulatov, Heidi Hoefer, Nathalie Bolfan-Casanova, Michel Fialin, Gerhard Brey, Tomoaki Watanabe, Masahiro Yoshimura
ADVANCED FUNCTIONAL MATERIALS 19 ( 14 ) 2282 - 2288 2009.7
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Direct patterning of dense cerium oxide thin film by developed ink-jet deposition method at moderate temperatures
R. Gallage, A. Matsuo, T. Fujiwara, T. Watanabe, N. Matsushita, M. Yoshimura
THIN SOLID FILMS 517 ( 16 ) 4515 - 4519 2009.6
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Lattice energy calculation for quantitatively-modeled Perovskite distortion
Tadashi Ishigaki, Zoran S. Nikolic, Tomoaki Watanabe, Nobuhiro Matsushita, Masahiro Yoshimura
SOLID STATE IONICS 180 ( 6-8 ) 475 - 479 2009.5
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Bioactive titanate nanomesh layer on the Ti-based bulk metallic glass by hydrothermal-electrochemical technique
Naota Sugiyama, HaiYan Xu, Takamasa Onoki, Yasuto Hoshikawa, Tomoaki Watanabe, Nobuhiro Matsushita, Xinmin Wang, FengXiang Qin, Mikio Fukuhara, Masahiro Tsukamoto, Nobuyuki Abe, Yuichi Komizo, Akihisa Inoue, Masahiro Yoshimura
ACTA BIOMATERIALIA 5 ( 4 ) 1367 - 1373 2009.5
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Hydrothermal Synthesis of Monodisperse Ce0.5Zr0.5O2 Metastable Solid Solution Nanocrystals
Takaaki Taniguchi, Tomoaki Watanabe, Nobuhiro Matsushita, Masahiro Yoshimura
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY ( 14 ) 2054 - 2057 2009.5
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Fabrication of transparent ceria films by spray deposition without post firing
Ruwan Gallage, Atsushi Matsuo, Tomoaki Watanabe, Nobuhiro Matsushita, Masahiro Yoshimura
JOURNAL OF ELECTROCERAMICS 22 ( 1-3 ) 33 - 39 2009.2
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Synthesis of Eu-Doped CaAlSiN3 from Ammonometallates: Effects of Sodium Content and Pressure
Jinwang Li, Tomoaki Watanabe, Hiroshi Wada, Tohru Setoyama, Masahiro Yoshimuraz
JOURNAL OF THE AMERICAN CERAMIC SOCIETY 92 ( 2 ) 344 - 349 2009.2
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Hydrothermal Growth of Fatty Acid Stabilized Iron Oxide Nanocrystals
Takaaki Taniguchi, Kazunori Nakagawa, Tomoaki Watanabe, Nobuhiro Matsushita, Masahiro Yoshimura
Journal of Physical Chemistry C 113 ( 3 ) 839 - 843 2009.1
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Fabrication of AMoO(4) (A = Ba, Sr) film on Mo substrate by solution reaction assisted ball-rotation
Dinesh Rangappa, Takeshi Fujiwara, Tomoaki Watanabe, Masahiro Yoshimura
MATERIALS RESEARCH BULLETIN 43 ( 11 ) 3155 - 3163 2008.11
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Crystallization behavior of the eutectic glass in the C12A7-CaYAlO4 system
Naonori Sakamoto, Kazunari Suda, Tomoaki Watanabe, Nobuhiro Matsushita, Masahiro Yoshimura
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY 28 ( 12 ) 2399 - 2404 2008.8
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On-site fabrication of crystalline cerium oxide films and patterns by ink-jet deposition method at moderate temperatures
Ruwan Gallage, Atsushi Matsuo, Takeshi Fujiwara, Tomoaki Watanabe, Nobuhiro Matsushita, Masahiro Yoshimura
JOURNAL OF THE AMERICAN CERAMIC SOCIETY 91 ( 7 ) 2083 - 2087 2008.7
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Melt synthesis of oxide phosphors with K(2)NiF(4) structures: CaLa(1-x)Eu(x)GaO(4)
Tadashi Ishigaki, Kenji Toda, Tomoaki Watanabe, Naonori Sakamoto, Nobuhiro Matsushita, Masahiro Yoshimura
JOURNAL OF MATERIALS SCIENCE 43 ( 14 ) 4749 - 4752 2008.7
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Preparation of Ba(1-x)Sr(x)WO(4)and Ba1-xCaxWO4 films on tungsten plate by mechanically assisted solution reaction at room temperature
Dinesh Rangappa, Takeshi Fujiwara, Tomoaki Watanabe, Masahiro Yoshimura
MATERIALS CHEMISTRY AND PHYSICS 109 ( 2-3 ) 217 - 223 2008.6
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Post-heat-treated spin-spray plated Mn(x)Zn(y)Fe(3-x-y)O(4) films exhibiting high resistivity and noise suppressing properties
A. K. Subramani, N. Matsushita, T. Watanabe, K. Kondo, M. Tada, M. Abe, M. Yoshimura
JOURNAL OF APPLIED PHYSICS 103 ( 7 ) 07E502 2008.4
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Rational hydrothermal route to monodisperse Hf1-xEUxO2-x/2 solid solution nanocrystals
Takaaki Taniguchi, Naonori Sakamoto, Tomoaki Watanabe, Nobuhiro Matsushita, Masahiro Yoshimura
JOURNAL OF PHYSICAL CHEMISTRY C 112 ( 13 ) 4884 - 4891 2008.4
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Hydrothermal synthesis of hydroxyapatite whiskers with sharp faceted hexagonal morphology
Ines S. Neira, Francisco Guitian, Takaaki Taniguchi, Tomoaki Watanabe, Masahiro Yoshimura
JOURNAL OF MATERIALS SCIENCE 43 ( 7 ) 2171 - 2178 2008.4
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Synthesis of a multinary nitride, Eu-doped CaAlSiN3, from alloy at low temperatures
Jinwang Li, Tomoaki Watanabe, Naonori Sakamoto, Hiroshi Wada, Tohru Setoyama, Masahiro Yoshimura
CHEMISTRY OF MATERIALS 20 ( 6 ) 2095 - 2105 2008.3
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Effects of titanium surface modifications on bonding behavior of hydroxyapatite ceramics and titanium by hydrothermal hot-pressing
Takamasa Onoki, Kazuyuki Hosoi, Toshiyuki Hashida, Yasuhiro Tanabe, Tornoaki Watanabe, Eiichi Yasuda, Masahiro Yoshimura
MATERIALS SCIENCE & ENGINEERING C-BIOMIMETIC AND SUPRAMOLECULAR SYSTEMS 28 ( 2 ) 207 - 212 2008.3
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Effect of Chemical Bonding in Hydroxyapatite Film Formation on Titanium by Aerosol Beam Process Reviewed
Hidenori Terasaki, Yuichi Komizo, Nobuyuki Abe, Masahiro Tsukamoto, Masahiro Yoshimura, Tomoaki Watanabe, Nobuhiro Matsushita, Naota Sugiyama
Smart Processing Technology 2 247 - 250 2008.3
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Spin-sprayed ferrite films with high resistivity and high-frequency magnetic loss for GHz conducted noise suppressors
A. K. Subramani, N. Matsushita, T. Watanabe, M. Tada, M. Abe, K. Kondo, M. Yoshimura
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS 148 ( 1-3 ) 136 - 140 2008.2
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NiZnCo ferrite films by spin spray technique: morphology and magnetic properties
Ailoor K. Subramani, Nobuhiro Matsushita, Masaru Tada, Tomoaki Watanabe, Masanori Abe, Masahiro Yoshimura
J. Mater. Sci. 43 ( 7 ) 2372-2376 - 2376 2008.1
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Low-temperature crystallization of Eu-doped red-emitting CaAlSiN3 from alloy-derived ammonometallates
Jinwang Li, Tomoaki Watanabe, Hiroshi Wada, Tohru Setoyama, Masahiro Yoshimura
CHEMISTRY OF MATERIALS 19 ( 15 ) 3592 - 3594 2007.7
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A simple process for ferrite film preparation from one solution without using hazardous oxidizing agent
A. K. Subramani, N. Matsushita, T. Watanabe, M. Tada, M. Abe, M. Yoshimura
JOURNAL OF APPLIED PHYSICS 101 ( 9 ) 09M504 2007.5
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Fabrication of Bioactive Ceramics Thin Film on Ti-based bulk alloys by using hydrothermal-electrochemical technique
Naota Sugiyama, Hai Yan Xu, Tomoaki Watanabe, Nobuhiro Matsushita, Takamasa Onoki, Yasuto Hoshikawa, Xinmin Wang, Akihisa Inoue, Masahiro Tsukamoto, Nobuyuki Abe, Yuichi Komizo, Masahiro Yoshimura
The 1st International Conference on Science and Technology for Advanced Ceramics(STAC) & The 2nd International Conference on Joining Technology for New Metallic Glasses and Inorganic Materials(JTMC) 2007.5
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A novel, controlled, and high-yield solvothermal drying route to nanosized barium titanate powders
Yury V. Kolen'ko, Kirill A. Kovnir, Ines S. Neira, Takaaki Taniguchi, Tadashi Ishigaki, Tomoaki Watanabe, Naonori Sakamoto, Masahiro Yoshimura
JOURNAL OF PHYSICAL CHEMISTRY C 111 ( 20 ) 7306 - 7318 2007.5
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Direct fabrication of CaWO4 patterns on cellulose based organic substrates by on-site ink-jet reaction at room temperature
Ruwan Gallage, Ryo Teranishi, Takeshi Fujiwara, Tornoaki Watanabe, Masahiro Yoshimura
MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY 137 ( 1-3 ) 299 - 303 2007.2
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Hydrothermal synthesis of fine NaTaO3 powder as a highly efficient photocatalyst for overall water splitting
Yungi Lee, Tomoaki Watanabe, Tsuyoshi Takata, Michikazu Hara, Masahiro Yoshimura, Kazunari Domen
BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 80 ( 2 ) 423 - 428 2007.2
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EFFECTS OF PROCESSING TEMPERATURTURE ON BONDING BEHAVIOR OF HYDROXYAPATITE CERAMICS AND TITANIUM BY HYDROTHERMAL HOT-PRESSING METHOD Reviewed
Takamasa Onoki, Tomoaki Watanabe, Eiichi Yasuda, Masahiro Yoshimura, Toshiyuki Hashida, Yasuhiro Tanabe
Ceramics Transaction 198 97 - 102 2007
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Direct patterning of crystallized BaTiO3 and TiO2 films in aqueous solutions
Tomoaki Watanabe, Masahiro Yoshimura
Thin Solid Films 515 ( 4 ) 2696 - 2699 2006.12
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Fabrication of AMO4 (A = Ba, Sr, Ca M = Mo, W) films on M substrate by solution reaction assisted ball rotation
Dinesh RANGAPPA, Takeshi FUJIWARA, Tomoaki WATANABE, Masahiro YOSHIMURA
Journal of Electroceramics 17 853 - 860 2006.12
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A facile high-yield solvothermal route to tin phosphide Sn4P3
Kirill A. Kovnir, Yury V. Kolen'ko, Sugata Ray, Jinwang Li, Tomoaki Watanabe, Mitsuru Itoh, Masahiro Yoshimura, Andrei V. Shevelkov
JOURNAL OF SOLID STATE CHEMISTRY 179 ( 12 ) 3756 - 3762 2006.12
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Fabrication of bulk glass from the eutectic melt in Y2O3-CaO-Al2O3 system Reviewed
Naonori Sakamoto, Tomoaki Watanabe, Masahiro Yoshimura
JOURNAL OF ELECTROCERAMICS 17 ( 2-4 ) 1075 - 1078 2006.12
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Direct observation of ferroelectricity in quasi-zero-dimensional barium titanate nanopartictes
Sugata Ray, Yury V. Kolen'ko, Desheng Fu, Ruwan Gallage, Naonori Sakamoto, Tomoaki Watanabe, Masahiro Yoshimura, Mitsuru Itoh
SMALL 2 ( 12 ) 1427 - 1431 2006.12
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Effect of high-pressure ammonia treatment on the activity of Ge3N4 photocatalyst for overall water splitting
Yungi Lee, Tomoaki Watanabe, Tsuyoshi Takata, Michikazu Hara, Masahiro Yoshimura, Kazunari Domen
JOURNAL OF PHYSICAL CHEMISTRY B 110 ( 35 ) 17563 - 17569 2006.9
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Fabrication of amorphous bulk and multi-phase ceramics by melting method in the HfO2-Al2O3-Gd2O3-Eu2O3 system
Aoi Sugiyama, Shunji Araki, Naonori Sakamoto, Tomoaki Watanabe, Masahiro Yoshimura
JOURNAL OF ELECTROCERAMICS 17 ( 1 ) 71 - 74 2006.9
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On-site fabrication of ceramics films from solution precursors by ink-jet and spray assisted processes
Atsushi Matsuo, Ruwan Gallage, Takeshi Fujiwara, Tomoaki Watanabe, Masahiro Yoshimura
JOURNAL OF ELECTROCERAMICS 16 ( 4 ) 533 - 536 2006.7
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CaTiO3 Film Formation on Ti and Ti-Alloy by Electrochemical Process for Hydroxyapatite Deposition
Tomoaki WATANABE, Naota SUGIYAMA, Nobuhiro MATSUSHITA, Xinmin WANG, Akihisa INOUE, Masahiro TSUKAMOTO, Nobuyuki ABE, Yuichi KOMIZO, Takamasa ONOKI, Yasuhiri TANABE, Masahiro YOSHIMURA
The Second International Conference on the Characterization and Control of Interfaces for High Quality Advanced Materals, and Joining Technology for New Metallic Glasses and Inorganic Materials 2006.5
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Direct carbon patterning on a conducting substrate in an organic liquid
T Watanabe, H Wang, Y Yamakawa, M Yoshimura
CARBON 44 ( 4 ) 799 - 801 2006.4
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Effect of 10 MPa ammonia treatment on the activity of visible light responsive Ta3N5 photocatalyst
Yungi Lee, Kota Nukumizu, Tomoaki Watanabe, Tsuyoshi Takata, Michikazu Hara, Masahiro Yoshimura, Kazunari Domen
CHEMISTRY LETTERS 35 ( 4 ) 352 - 353 2006.4
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Direct fabrication of anatase/activated carbon nano-hybrid materials by hydrothermal with ball milling method at low temperature
N Sakamoto, T Fujino, T Watanabe, M Yoshimura
JOURNAL OF MATERIALS SCIENCE 41 ( 5 ) 1363 - 1368 2006.3
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Solution synthesis of crystallized AMO(4) (A=Ba, Sr, Ca; M=W, Mo) film at room temperature
R Dinesh, T Fujiwara, T Watanabe, K Byrappa, M Yoshimura
JOURNAL OF MATERIALS SCIENCE 41 ( 5 ) 1541 - 1546 2006.3
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Melt synthesis and characterization of complexed oxide perovskites containing rare earths
T Ishigaki, K Seki, E Nishimura, T Watanabe, M Yoshimura
JOURNAL OF ALLOYS AND COMPOUNDS 408 1177 - 1181 2006.2
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Fabrication of crack-free C12A7 nano-ceramics composite from eutectic glass in the C12A7-CaYAlO4 system
Naonori Sakamoto, Tomoaki Watanabe, Masahiro Yoshimura
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY 3 ( 4 ) 266 - 271 2006
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Vibrational spectra of Ca3SiO5: Ultraviolet laser Raman spectroscopy at high temperatures
H Fujimori, H Komatsu, K Ioku, S Goto
JOURNAL OF THE AMERICAN CERAMIC SOCIETY 88 ( 7 ) 1995 - 1998 2005.7
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Direct fabrication of TiO2 nanoparticles deposited on hydroxyapatite crystals under mild hydrothermal conditions
P Sujaridworakun, D Pongkao, A Ahniyaz, Y Yamakawa, T Watanabe, M Yoshimura
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY 5 ( 6 ) 875 - 879 2005.6
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Preparation and characterization of sodium tantalate thin films by hydrothermal-electrochemical synthesis
YG Lee, T Watanabe, T Takata, JN Kondo, M Hara, M Yoshimura, K Domen
CHEMISTRY OF MATERIALS 17 ( 9 ) 2422 - 2426 2005.5
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Formation and characterization of continuous Tetragonal Solid Solution in the system ZrO2-CeO2 by Hydrothermal Method
J. Phy. Chem. B 109 6136-6139 2005
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Direct Fabrication of Functional Ceramic Films and Patterns in/from Solution without Post-Firing
Proc. of Japan-Korea Seminar on Ceramics 281-284 2003
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Direct fabrication of patterned functional ceramic films by soft solution processing without post-firing
M Yoshimura, T Watanabe, T Fujiwara, R Teranishi
RAPID PROTOTYPING TECHNOLOGIES 758 65 - 72 2003
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Direct fabrication of crystallized LiCoO2 films on paper by artificial biomineralization with electrochemically activated interfacial reactions
T Fujiwara, Y Nakagawa, T Nakaue, SW Song, T Watanabe, R Teranishi, M Yoshimura
CHEMICAL PHYSICS LETTERS 365 ( 5-6 ) 369 - 373 2002.11
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Direct fabrication of patterned PbS and US on organic sheets at ambient temperature by on-site reaction using inkjet printer
R Teranishi, T Fujiwara, T Watanabe, M Yoshimura
SOLID STATE IONICS 151 ( 1-4 ) 97 - 103 2002.11
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Direct fabrication of oxide films by a microwave-hydrothermal method at low temperature
JH Lee, N Kumagai, T Watanabe, M Yoshimura
SOLID STATE IONICS 151 ( 1-4 ) 41 - 45 2002.11
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Direct fabrication of lithium cobalt oxide films on various substrates in flowing aqueous solutions at 150 degrees C
T Watanabe, H Uono, SW Song, KS Han, M Yoshimura
JOURNAL OF SOLID STATE CHEMISTRY 162 ( 2 ) 364 - 370 2001.12
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Direct fabrication of crystalline vanadates films by hydrothermal-electrochemical method
T Watanabe, WS Cho, WL Suchanek, M Endo, Y Ikuma, M Yoshimura
SOLID STATE SCIENCES 3 ( 1-2 ) 183 - 188 2001.1
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Effect of LiOH concentration change on simultaneous preparation of LiCoO2 film and powder by hydrothermal method
SW Song, KS Han, Sasagawa, I, T Watanabe, M Yoshimura
SOLID STATE IONICS 135 ( 1-4 ) 277 - 281 2000.11
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Direct fabrication of LiCoO2 films on papers by electrodeposition method with interfacial reaction
T Fujiwara, Y Nakagawa, SW Song, R Teranishi, T Watanabe, M Yoshimura
SECOND INTERNATIONAL CONFERENCE ON PROCESSING MATERIALS FOR PROPERTIES 935 - 938 2000
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Room-temperature direct patterning of crystalline inorganic materials on organic substrates by on-site solution reaction
R Teranishi, T Fujiwara, T Watanabe, M Yoshimura
SECOND INTERNATIONAL CONFERENCE ON PROCESSING MATERIALS FOR PROPERTIES 961 - 964 2000
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A solution flow system for hydrothermal-electrochemical growth of multilayered thin films
WL Suchanek, T Watanabe, B Sakurai, N Kumagai, M Yoshimura
REVIEW OF SCIENTIFIC INSTRUMENTS 70 ( 5 ) 2432 - 2437 1999.5
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Simultaneous and direct fabrication of lithium cobalt oxide film and powder using soft solution processing at 100 degrees C
KS Han, SW Song, T Watanabe, M Yoshimura
ELECTROCHEMICAL AND SOLID STATE LETTERS 2 ( 2 ) 63 - 66 1999.2
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In situ fabrication of SrTiO3-BaTiO3 layered thin films by hydrothermal-electrochemical technique
M Yoshimura, WL Suchanek, T Watanabe, B Sakurai
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY 19 ( 6-7 ) 1353 - 1359 1999
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Functionally graded SrTiO3-BaTiO3 thin films prepared by the hydrothermal-electrochemical method under flowing solution
M Yoshimura, W Suchanek, T Watanabe, B Sakurai, M Abe
JOURNAL OF MATERIALS RESEARCH 13 ( 4 ) 875 - 879 1998.4
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Preparation of BaTiO3 Thin Films by the Hydrothermal-electrochemical Method in the Flowing Solution
Solid State Ionics 109 65-72 1998.1
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Solution flow system for hydrothermal-electrochemical synthesis: New opportunities for multilayered oxide films
W Suchanek, T Watanabe, B Sakurai, M Yoshimura
HIGH-DENSITY MAGNETIC RECORDING AND INTEGRATED MAGNETO-OPTICS: MATERIALS AND DEVICES 517 639 - 649 1998
Books
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ナノコンポジットマテリアル
渡辺友亮, 吉村昌弘（ Role： Joint author）
フロンティア出版 2005.1
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超微細パターニング技術
渡辺友亮, 吉村昌弘（ Role： Joint author）
サイエンス＆テクノロジー 2005.1
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グリーンマテリアルテクノロジー
吉村昌弘, 渡辺友亮（ Role： Joint author）
講談社 2002.7 （ ISBN:4061543091 ）
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超臨界流体のすべて
渡辺友亮, 吉村昌弘（ Role： Joint author）
テクノシステム 2002.1
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セラミックスデータブック２００１
吉村昌弘, 渡辺友亮（ Role： Joint author）
工業製品技術協会 2001.1
MISC
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Aqueous route to size-controlled and doped organophilic ceria nanocrystals
Takaaki Taniguchi, Tomoaki Watanabe, Naonori Sakamoto, Nobuhiro Matsushita, Masahiro Yoshimura
CRYSTAL GROWTH & DESIGN 8 ( 10 ) 3725 - 3730 2008
Awards
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文部科学大臣表彰
2007
Research Projects
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宇宙空間におけるクラスレートハイドレートの形成メカニズム
Grant number：21H01151 2021.4 - 2026.3
日本学術振興会 科学研究費助成事業 基盤研究(B)
深澤 倫子, 関根 由莉奈, 渡辺 友亮, 香内 晃
Grant amount：\17550000 （ Direct Cost: \13500000 、 Indirect Cost：\4050000 ）
本研究の目的は、超高真空条件におけるアモルファス氷から CO2 ハイドレートへの相転移機構を明らかにし、CO2 ハイドレートが宇宙空間のどこにどのような構造で存在するかを示すことにある。星間分子雲において鉱物微粒子上に凝集した水はアモルファス氷として存在することが知られているが、CO2 を含むアモルファス氷が一時的な昇温に伴って CO2 ハイドレートに相転移する可能性が示唆されている。これまでの研究から、CO2 を含むアモルファス氷を昇温した場合、100 K 付近でCO2 ハイドレートへ相転移する現象が見出されているが、その結晶相の構造特定には至っていない。本研究では、電子線回折法、赤外分光法、中性子回折法を用いた構造解析と超高真空極低温透過型電子顕微鏡観察により、アモルファス氷から生成する CO2 ハイドレートの構造特定を特定し、相転移機構を解き明かすことを目標としている。
2021年度は、赤外分光装置と電子線回折装置を組みこんだ低温真空チャンバーを設計・製作し、赤外吸収スペクトルと電子線回折を同時にその場観察可能な構造解析システムを構築した。この低温真空チャンバーを用いて 6 K から170 K の広い温度範囲で氷試料を蒸着し、昇温および降温に伴う構造変化の過程を解析することに成功している。この一連の実験により確立した試料生成および構造解析の方法を用いて、今後はさらに蒸着試料の組成や蒸着条件、温度変履歴の変化に伴う構造変化の過程を解析する予定である。 -
宇宙空間におけるクラスレートハイドレートの形成メカニズム
Grant number：23K20875 2021.4 - 2026.3
日本学術振興会 科学研究費助成事業 基盤研究(B)
深澤 倫子, 関根 由莉奈, 渡辺 友亮, 香内 晃
Grant amount：\17550000 （ Direct Cost: \13500000 、 Indirect Cost：\4050000 ）
本研究の目的は、超高真空条件におけるアモルファス氷から CO2 ハイドレートへの相転移機構を明らかにし、CO2 ハイドレートが宇宙空間のどこにどのような構造で存在するかを示すことにある。星間分子雲において鉱物微粒子上に凝集した水はアモルファス氷として存在することが知られているが、CO2 を含むアモルファス氷が一時的な昇温に伴って CO2 ハイドレートに相転移する可能性が示唆されている。これまでの研究から、CO2 を含むアモルファス氷を昇温した場合、100 K 付近でCO2 ハイドレートへ相転移する現象が見出されているが、その結晶相の構造特定には至っていない。本研究では、電子線回折法、赤外分光法、中性子回折法を用いた構造解析と超高真空極低温透過型電子顕微鏡観察により、アモルファス氷から生成する CO2 ハイドレートの構造特定を特定し、相転移機構を解き明かすことを目標としている。
これまでに、6 K から170 K の広い温度範囲で氷試料の蒸着実験を行い、その成果としてアモルファス氷の相転移温度が蒸着温度に依存して変化することを明らかにした。さらに2023年度は、CO2 を含むアモルファス氷についての実験を進め，蒸着温度に応じて純氷とは異なる相転移挙動を示すことを明らかにしている。今後はさらに組成や蒸着速度、昇温速度を変えて蒸着・昇温実験を行い、構造変化のメカニズムを明らかにする予定である。 -
Development of new fabrication method for photoelectrodes
Grant number：16K06860 2016.4 - 2020.3
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)
Watanabe Tomoaki
Grant amount：\3380000 （ Direct Cost: \2600000 、 Indirect Cost：\780000 ）
In this study, we developed a method of applying photocatalyst powder on a metal substrate and rolling it with a roll press to form a photoelectrode. As a result of the method, we succeeded in fabricating a photoelectrode with a width of 20 mm and a length of 50 mm, and confirmed that the photoelectrode characteristics are equivalent to those of a smaller one. As an example, using titanium metal as a metal substrate, LaNbON2 as a photocatalyst material is laminated by an electrodeposition method, and then the roll-pressed photoelectrode at room temperature is about 100uA/cm2 in simulated sunlight (AM1.5G). The photocurrent was observed. This is a value comparable with other methods, and the superiority of photoelectrode fabrication by the roll pressing method, which is a very simple and low-cost method, was shown.
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Structural analyses of ice film in hydroge
Grant number：26400522 2014.4 - 2017.3
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)
Fukazawa Tomoko, SEKINE YURINA, WATANABE TOMOAKI
Grant amount：\4810000 （ Direct Cost: \3700000 、 Indirect Cost：\1110000 ）
To investigate the structure and properties of ice from water in hydrogels, we measured the Raman spectra of hydrogels with various water contents. From the temperature dependence of the vibrational frequencies of the O-H stretching mode, we analyzed the structural change of water as function of temperature and water content. The results showed the phase transition dynamics of water in hydrogels.
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Synthesis of Functional Nitride Materials by Ammonothemal Method
Grant number：24550237 2012.4 - 2015.3
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)
WATANABE Tomoaki
Grant amount：\3250000 （ Direct Cost: \2500000 、 Indirect Cost：\750000 ）
The new ammonothermal reactor has been developed. It has lower dead volume than previous one. SrAlSiN3:Eu2+ is a red-emitting phosphor that is potentially very useful in white light-emitting diodes because of its properties such as thermal stability and bright emissivity features.A limitation of this phosphor is that it is commonly synthesized at high temperature and pressure. To address this limitation, we investgate a low-temperature synthesis of SrAlSiN3:Eu2+ phosphors through a dissolution–precipitation process in supercritical ammonia and the phosphors’ physical properties. All products exhibit a broad emission that is centered at approximately 580 nm, which we attribute to the 5d→4f transition of Eu2+, under excitation wavelengths from the ultraviolet to blue range.
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Low temperature synthesis of(oxy) nitride
Grant number：22750191 2010 - 2011
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)
WATANABE Tomoaki
Grant amount：\3120000 （ Direct Cost: \2400000 、 Indirect Cost：\720000 ）
When considering nitrides as functional materials such as photocatalysts and phosphor, the effects of local structures such as surface morphology and defects in crystals are far more significant than those of the mean values of bulk properties. Therefore, when shifting the study of nitrides from the conventional to the new. such as from the study of nitrides as environmentally inert materials to nitrides as functional materials. it is necessary to re-evaluate, from the beginning, the methodology of nitride synthesis. Based on the above perspectives, we conduct our study with emphasis on the synthesis of functional nitride related materials, especially photocatalysts materials, using the ammonothermal method. In conclusion, we have succeeded to prepare LaTaON_2 perovskite with well crystallinity in supercritical ammonia with sodium amide at 600℃. And the photocatalytic properties of LaTaON_2 prepared by ammonothermal method have improved in comparison of LaTaON_2 by solid state reaction. Before and after reaction in supercritical ammonia with sodium amide as a mineralizer, the morphology and particle size was dramatically changed. So it may be considered this reaction proceed in NH_3-NaNH_2 solution as a solvent. This approach could be extended to synthesis of other oxynitrid groups.
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環境安定型磁性金属ナノ粒子の作製とその応用
Grant number：18710095 2006 - 2007
日本学術振興会 科学研究費助成事業 若手研究(B)
渡辺 友亮
Grant amount：\2000000 （ Direct Cost: \2000000 ）
本研究課題ではエタノールを溶媒とした新しい液相放電合成法により、ニッケル金属ナノ粒子内包カーボンを直接作製することに成功した。反応は常温常圧の窒素雰囲気下で40KVppの高電圧高速パルスを一対のニッケル電極間に印加して行った。その後反応溶液をろ過し不純物を取り除いた後遠心分離器を用いて磁性金属内包ナノ粒子を分離した。以上の操作により得られたナノカプセルの透過電子顕微鏡観察によれば、生成したナノカプセルは直径20-30nm程度の大きさであることが確認された。内部のニッケル金属ナノ粒子を覆っているグラファイト層は透過電子顕微鏡観察の結果3-4nmであることがわかった。さらに表面を覆っているグラファイト層の層間隔は0.34nmであることがわかり、これはグラファイトの相関距離と一致することが確認された。得られたナノカプセルを塩酸に分散させ、加熱させる耐薬品性試験を行った結果、本研究で作製した金属内包カーボンナノカプセルは高度な安定性を示し、内部のニッケル金属ナノ粒子は完全に薄いグラファイト層で覆われていることが確認出来た。耐薬品性試験後の各種磁気特性試験の結果、内部のニッケル金属ナノ粒子は磁気特性を失っていないことが確認され、さらに260℃でアニールしたものについては磁気特性の向上が見られた。本試験の結果280℃以上の加熱によって表面のグラファイト層は破壊されると結論づけられた。得られたナノカプセルは依然として収率が悪いため、今後も引き続き精力的な研究を行い、大量合成を実現する必要がある。
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Fabrication of Ceramics Nano-Composites by Casting of Eutectic Melts in Multi-Component Systems
Grant number：18360313 2006 - 2007
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
YOSHIMURA Masahiro, WATANABE Tomoaki
Grant amount：\17450000 （ Direct Cost: \15500000 、 Indirect Cost：\1950000 ）
[I]Major Establishments
(1)The preparation of transparent bulk ceramics by melting/casting of eutectic melt in the ternary system Al_2O_3-HfO_2-GdAlO_3, and fabrication of ternary nano-composite ceramics by appropriate annealing of them (Papers 1 & 3).
(2) The preparation of transparent bulk materials from the eutectic melt in pseudo-binary C_<12>A_7-CoYAlO_4 system in the ternary system Al_2O_3-CaO-Y_2O_3, and the fabrication of binary nano-composites by appropriate annealing of them (Papers 2,4 & 11).
(3)The computer simulation can depict the solidification of the melts in these systems, thus explains their Nano-/Meso-/Micro-structures (Papers 5-8).
(4)Those amorphous matrices and/or the ternary compound CaLaGaO_4 can be formed as a red phosphor by doping Eu (Papers 3,9 & 10).
[II]Their Importance
Ceramics nano-composites have generally been fabricated from mixed powders by solid state processes : (1) Synthesis of them by solid state reactions, (2) the dispersion of powders, (3) molding of powders, (4) firing for sintering. Those processes are difficult to prepare homogeneous products and nano-structure controlled ones, because higher temperature firing would bring about the grain growth of every phase.
The present research, on the other hand, (1) makes the homogeneous eutectic melts, (2) casts in a mold with the desired shape to fabricate the amorphous bulk, then (3) anneals to result in the nano-structures materials. Therefore, transparent nano-structured composites, which were very difficult to fabricate from powders by sintering, can be produced.
Moreover, the solid solution samples with multi-components with homogeneous compositions can be produced by this method easily. The present method using melt/cast of eutectic melts, therefore, could be evaluated an innovative method for nano-composites ceramics. It was awarded as one of the best poster award (Paper #3) and the cover page of an International Journal (Paper #1). -
Direct Fabricaton of Ceramics Nano-Composites by Solution Processing
Grant number：16360323 2004 - 2005
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
YOSHIMURA Masahiro, WATANABE Tomoaki
Grant amount：\10900000 （ Direct Cost: \10900000 ）
This study aimed direct fabrication of ceramics nano-composites and/or nano-hybrids by Solution Processing. Following results have been obtained :
1) TiO_2/hydroxyapatite nano-composites
To combine photocatalitic activity of TiO_2 and chemical and biological absorption of hydroxyapatite, their nano-composites have been fabricated in a single step in a solution. Calcium carbonate powders were hydrothermally treated at 100-180℃ in the mixture of H_3PO_4 and water soluble Ti complex solution Anatase nanocrystals with 20 nm width and 60 nm length have been deposited on the surface of hydroxyapatite micro-crystals with severe μm size. Theses composites showed higher photocatalytic activities than TiO_2 only.
2) Nano-particles of CeO_2-ZrO_2 Solid Solutions
In the advance of nano-particle synthesis, we have succeeded to fabricate the nano-particle of metastable tetragonal solid solutions in the CeO_2-ZrO_2 system, by hydrothermal methods at 100 - 150℃ for their co-precipitates.
3) Carbon nano-cells and patterns
By applying the electro-discharge in non-aqueous solvents, we could succeed to obtain metal encapsulated carbon nano-cells with 10-100 nm in size, and a pattern of ammorphous carbon directly on conducting substrates. It is very interesting that carbon patterning could be established in liquid phase.
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