研究者詳細 - 小林　亮

論文 - 小林　亮

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Development of Z-scheme photocatalyst systems combining non-metal oxide materials for water splitting under visible light irradiation: (CuGa)_0.5ZnS₂ as a H₂-evolving photocatalyst and TaON as an O₂-evolving photocatalyst 査読有り国際共著

Misa Moriya, Shunya Yoshino, Makoto Kobayashi, Hideki Kato, Yun Hau Ng, Akihide Iwase

Advanced Energy and Sustainability Research 頁： 2400371 2025年1月

Mechanical exfoliation of non-var der Waals solids: A study of layered perovskite ferroelectric CsPb₂Nb₃O₁₀ 査読有り

Masanari Shimada, Yan Li, Makoto Kobayashi, Eisuke Yamamoto, Rubén Cantón Vitoria, Minoru Osada

Chemistry Letters 64 巻 ( 2 ) 頁： upaf006 2025年1月

Ferroelectricity in CsPb₂Nb₃O₁₀ and exfoliated 2D nanosheets 査読有り国際共著

Yan Li, Masanari Shimada, Makoto Kobayashi, Eisuke Yamamoto, Rubén Cantón Vitoria, Xiaoyan Liu, Minoru Osada

Dalton Transactions 53 巻 ( 45 ) 頁： 18122 - 18127 2024年9月

Atomic Layer Engineering of Ferroelectricity in DionJacobson Perovskites 査読有り

Shu Morita, Daisuke Urushihara, Keita Nishibashi, Makoto Kobayashi, Eisuke Yamamoto, Toru Asaka, Hiroshi Nakajima, Shigeo Mori, Minoru Osada

Journal of the American Chemical Society 146 巻 ( 36 ) 頁： 25221 - 25231 2024年8月

Atomic Layer Engineering of Pd Nanosheets for Enhanced Hydrogen Evolution Reaction 査読有り

Sumiya Ando, Eisuke Yamamoto, Makoto Kobayashi, Minoru Osada

Nano Letters 24 巻 ( 36 ) 頁： 11239 - 11245 2024年8月

Solid-state surfactant templating for controlled synthesis of amorphous 2D oxide/oxyhydroxide nanosheets 査読有り

Eisuke Yamamoto, Daiki Kurimoto, Kentaro Ito, Kohei Hayashi, Makoto Kobayashi, Minoru Osada

Nature Communications 25 巻 ( 1 ) 頁： 6612 2024年8月

Ultrafast 2D Nanosheet Assembly via Spontaneous Spreading Phenomenon 査読有り国際共著

Yue Shi, Hong Li, Hirofumi Tsunematsu, Harumi Ozeki, Kimiko Kano, Eisuke Yamamoto, Makoto Kobayashi, Hiroya. Abe, Chun-Wei, Chen, Minoru Osada

Small 20 巻 ( 36 ) 頁： 2403915 2024年7月

Z-scheme water splitting utilizing CuLi_1/3Ti_2/3O₂ as a hydrogen-evolving photocatalyst with response up to 600 nm 招待有り査読有り

Shunya Yoshino, Tanya Kurutach, Qingshan Liu, Toshiki Yamanaka, Shunsuke Nozawa, Makoto Kobayashi, Hiromu Kumagai, Hideki Kato

Sustainable Energy & Fuels 8 巻 ( 6 ) 頁： 1260 - 1268 2024年2月

Multiemission of Ce³⁺ from Single Crystallographic Site Induced by Disordering of Ions 査読有り

Takuya Yasunaga, Makoto Kobayashi, Kenji Oqmhula, Huan Qi, Tom Ichibha, Kenta Hongo, Shunsuke Yamamoto, Ryo Maezono, Masaya Mitsuishi, Minoru Osada, Hideki Kato, Masato Kakihana

Inorganic Chemistry 63 巻 ( 2 ) 頁： 1288 - 1295 2024年1月

Hetero-assembly design of 2D oxide nanosheets for tailored thermal shielding materials 査読有り

Hirofumi Tsunematsu, Keita Nishibashi, Eisuke Yamamoto, Makoto Kobayashi, Tomohiro Yoshida, Minoru Osada

Applied Physics Express 17 巻頁： 015002 2024年1月

Facile Synthesis of Pd Nanosheets and Implications for Superior Catalytic Activity 査読有り

Sumiya Ando, Eisuke Yamamoto, Makoto Kobayashi, Akichika Kumatani, Minoru Osada

ACS Nano 18 巻 ( 1 ) 頁： 461 - 469 2023年11月

Gigantic Thermal Shielding in 2D Oxide Nanosheets 査読有り

Hirofumi Tsunematsu, Yue Shi, Eisuke Yamamoto, Makoto Kobayashi, Tomohiro Yoshida, Minoru Osada

ACS Nano 17 巻 ( 2 ) 頁： 11396 - 11405 2023年5月

Ultrahigh Energy Storage in 2D High-κ Perovskites 査読有り

Hyung-Jun Kim, Shu Morita, Ki-Nam Byun, Yue Shi, Takaaki Taniguchi, Eisuke Yamamoto, Makoto Kobayashi, Yasuo Ebina, Takayoshi Sasaki, Minoru Osada

Nano Letters 23 巻 ( 9 ) 頁： 3788 - 3795 2023年5月

2D Bismuth Oxyfluorides: A New Member of Cationic Nanosheets 査読有り

Makoto Kobayashi, Tsubasa Tasaka, Eisuke Yamamoto, Minoru Osada

Chemistry Letters 52 巻 ( 6 ) 頁： 449 - 451 2023年4月

Pseudo-Topotactic Transformation from Oxide Nanosheets to Amorphous Nanosheets 査読有り

Hikaru Sugimoto, Makoto Kobayashi, Eisuke Yamamoto, Minoru Osada

Chemistry Letters 52 巻 ( 5 ) 頁： 322 - 324 2023年4月

Composite design of 2D inorganic nanosheets for flexible energy storage capacitors 査読有り

Ki Nam Byun, Shi Yue, Eisuke Yamamoto, Makoto Kobayashi, Minoru Osada

Journal of the Ceramic Society of Japan 131 巻 ( 4 ) 頁： 77 - 82 2023年4月

Automated One-Drop Assembly for Facile 2D Film Deposition 査読有り

Yue Shi, Eisuke Yamamoto, Makoto Kobayashi, Minoru Osada

ACS Applied Materials & Interfaces 15 巻 ( 18 ) 頁： 22737 - 22743 2023年3月

Free-standing Molecularly Thin Amorphous Silica Nanosheets 査読有り

Eisuke Yamamoto, Kosuke Fujihara, Yuma Takezaki, Kentaro Ito, Yue Shi, Makoto Kobayashi, Minoru Osada

Small 19 巻 ( 22 ) 頁： 2300022 2023年2月

Molecularly Thin BaTiO₃ Nanosheets with Stable Ferroelectric Response 査読有り国際共著

Kazuki Hagiwara, Ki Nam Byun, Shu Morita, Eisuke Yamamoto, Makoto Kobayashi, Xioyang Liu, Minoru Osada

Advanced Electronic Materials 9 巻 ( 3 ) 頁： 2291239 2023年2月

Damage-free LED lithography for atomically thin 2D material devices 査読有り

Yue Shi, Takaaki Taniguchi, Ki-Nam Byun, Daiki Kurimoto, Eisuke Yamamoto, Makoto Kobayashi, Kazuhito Tsukagoshi, Minoru Osada

Scientific Reports 13 巻 ( 1 ) 頁： 2583 2023年2月

Improved energy storage performance of PVDF nanocapacitors by utilizing 2D inorganic barrier 査読有り国際共著

Byun Ki-Nam, Eisuke Yamamoto, Makoto Kobayashi, Minoru Osada

Chemistry Letters 52 巻 ( 1 ) 頁： 51 - 54 2022年11月

Tailored synthesis of molecularly thin platinum nanosheets using designed 2D surfactant solids 招待有り査読有り

Eisuke Yamamoto, Akiko Suzuki, Makoto Kobayashi, Minoru Osada

Nanoscale 14 巻 ( 32 ) 頁： 11561 - 11567 2022年6月

Influences of pulverization and annealing treatment on photocatalytic activity of BiVO₄ for oxygen evolution 査読有り

Kazuya Okuno, Hiromu Kumagai, Junie Jhon M. Vequizo, Kosaku Kato, Makoto Kobayashi, Akira Yamakata, Masato Kakihana, Hideki Kato

Sustainable Energy Fuels 6 巻 ( 7 ) 頁： 1698 - 1707 2022年2月

Synthesis of brookite-type TiO₂ nanoparticles by emulsion assisted hydrothermal method using titanium glycolate complex 査読有り

Kohei Kasuya, Md. Shahiduzzaman, Makoto Kobayashi, Shu Yin, Masato Kakihana, Koji Tomita

Journal of the Ceramic Society of Japan 129 巻 ( 12 ) 頁： 720 - 724 2021年12月

Facile titania nanocoating using single droplet assembly of 2D nanosheets 査読有り国際誌

Yue Shi, Eisuke Yamamoto, Makoto Kobayashi, Minoru Osada

Journal of the Ceramic Society of Japan 2021年4月

Synthesis of NaMoO₃F and Na₅W₃O₉F₅ with Morphological Controllability in Non-Aqueous Solvents 査読有り国際誌

Yusuke Asakura, Tomoyo Akahira, Makoto Kobayashi, Minoru Osada, Shu Yin

Inorganic Chemistry 59 巻 ( 15 ) 頁： 10707 - 10716 2020年8月

Z-scheme water splitting by microspherical Rh-doped SrTiO₃ photocatalysts prepared by a spray drying method 査読有り国際誌

Hong Phong Duong, Mashiyama Takahiro, Kobayashi Makoto, Iwase Akihide, Kudo Akihiko, Asakura Yusuke, Yin Shu, Kakihana Masato, Kato Hideki

Applied Catalysis B: Environmental 252 巻頁： 222 - 229 2019年9月

Anisotropy in Stable Conformations of Hydroxylate Ions between the {001} and {110} Planes of TiO₂ Rutile Crystals for Glycolate, Lactate, and 2-Hydroxybutyrate Ions Studied by Metadynamics Method. 査読有り国際誌

Nada H, Kobayashi M, Kakihana M

ACS omega 4 巻 ( 6 ) 頁： 11014 - 11024 2019年6月

Selective Synthesis and Photocatalytic Oxygen Evolution Activities of Tantalum/Nitrogen-Codoped Anatase, Brookite and Rutile Titanium Dioxide 査読有り国際誌

Nishioka, Shunta, Kobayashi, Makoto, Lu, Daling, Kakihana, Masato, Maeda, Kazuhiko

Bulletin of the Chemical Society of Japan 92 巻 ( 6 ) 頁： 1032 - 1038 2019年6月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：CHEMICAL SOC JAPAN

Tantalum/nitrogen codoped titanium dioxide (TiO2:Ta,N) having a rutile structure has recently been reported to be a good photocatalyst for visible-light water oxidation. In this work, three different polymorphs of TiO2:Ta,N (anatase, brookite and rutile) were synthesized by a hydrothermal method using water-soluble titanium/tantalum complexes as precursors, followed by thermal nitridation with dry ammonia gas. Effects of the physicochemical properties on photocatalytic activity for O-2 evolution from an aqueous silver nitrate solution under visible light (lambda > 400 nm) were investigated. Experimental results indicated that defect formation during the nitridation procedure was the dominant factor for photocatalytic activity. Anatase TiO2:Ta,N was the most active for O-2 evolution among the three polymorphs, and also served as an O-2 evolution photocatalyst in Z-scheme overall water splitting in combination with Rh-doped strontium titanate (SrTiO3:Rh) and an Fe3+/Fe2+ redox-shuttle mediator.

DOI： 10.1246/bcsj.20190037

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Synthesis of Ba_1-xSr_xYSi₂O₅N and Discussion Based on Structure Analysis and DFT Calculation 査読有り国際誌

Takuya Yasunaga, Makoto Kobayashi, Kenta Hongo, Kotaro Fujii, Shunsuke Yamamoto, Ryo Maezono, Masatomo Yashima, Masaya Mitsuishi, Hideki Kato, Masato Kakihana

Journal of Solid State Chemistry 276 巻頁： 266-271 2019年5月

Crystal structures of Ca_4+xY_3-xSi₇O_15+xN_5-x (0 <= x <= 1) comprising of an isolated [Si₇(O,N)₁₉] unit 査読有り国際誌

Kobayashi Makoto, Yasunaga Takuya, Kato Hideki, Fujii Kotaro, Yashima Masatomo, Kakihana Masato

Acta Crystallographica Section E: Crystallographic Communications 75 巻頁： 260 - + 2019年2月

Hydrothermal Synthesis of Pseudocubic Rutile-Type Titania Particles 国際誌

Makoto Kobayashi, Hideki Kato, Takamichi Miyazaki, Masato Kakihana

Ceramics 2 巻 ( 1 ) 頁： 56-63 2019年1月

Sodium titanium oxide bronze nanoparticles synthesized via concurrent reduction and Na⁺-doping into TiO₂(B) 査読有り国際誌

Hasegawa, George, Tanaka, Moeko, Vequizo, Junie Jhon M., Yamakata, Akira, Hojo, Hajime, Kobayashi, Makoto, Kakihana, Masato, Inada, Miki, Akamatsu, Hirofumi, Hayashi, Katsuro

Nanoscale 11 巻 ( 3 ) 頁： 1442 - 1450 2019年1月

B-site-ordered Double-perovskite Oxide Up-conversion Phosphors Doped with Yb and Ho, Er, or Tm 査読有り国際誌

Kasuya Kohei, Sato Yasushi, Kobayashi Makoto, Kato Hideki, Kakihana Masato, Tomita Koji

Journal of Photopolymer Science and Technology 32 巻 ( 4 ) 頁： 593 - 596 2019年

Ce⁴⁺-based Compounds Capable of Photoluminescence by Charge Transfer Excitation under Near Ultraviolet-Visible Light 査読有り国際誌

Dawei Wen, Hideki Kato, Makoto Kobayashi, Shunsuke Yamamoto, Masaya Mitsuishi, Kotaro Fujii, Masatomo Yashima, Masato Kakihana

Inorganic Chemistry 57 巻 ( 23 ) 頁： 14524 - 14531 2018年12月

Expansion of Photoresponse Window of BiVO₄ Photocatalyst by Doping of Chromium(VI) 査読有り国際誌

Kazuya Okuno, Hideki Kato, Junie Jhon, M. Vequizo, Yamakata Akira, Hisayoshi Kobayashi, Makoto Kobayashi, Masato Kakihana

RSC Advances 8 巻 ( 67 ) 頁： 38140-38145 2018年11月

Photoluminescence Properties of Layered Perovskite-type Strontium Scandium Oxyfluoride Activated with Mn⁴⁺ 査読有り

Hideki Kato*, Yohei Takeda, Makoto Kobayashi, Hisayoshi Kobayashi, Masato Kakihana

Frontiers in Chemistry 6 巻頁： 467 2018年10月

Structural Change in SrSiO₃ Induced by Introduction of Nitrogen 査読有り

Makoto Kobayashi, Jihae Kim, Hironori Sato, Takuya Yasunaga, Hideki Kato*, Kotaro Fujii, Masahiro Shiraiwa, Masatomo Yashima, Masato Kakihana

Chemistry Letters 47 巻 ( 10 ) 頁： 1327-1329 2018年10月

Effects of Crystal Structure on Up-Conversion Luminescence in Er³⁺/Yb³⁺ Co-Doped SrTa₄O₁₁ 査読有り国際誌

Sayaka Tamura, Michio Iwaoka, Yasushi Sato, Makoto Kobayasi, Masato Kakihana, Koji Tomita

Chemistry Letters 47 巻 ( 10 ) 頁： 1282-1284 2018年10月

High Temperature Hydrogen Gas Sensing Property of GaN Prepared from α-GaOOH 査読有り

Angga Hermawan, Yusuke Asakura, Makoto Kobayashi, Masato Kakihana, and Shu Yin*

Sensors and Actuators B: Chemical 276 巻頁： 388-396 2018年8月

複合アニオン化合物を母体とする新規蛍光体の探索招待有り査読有り

小林亮, 加藤英樹, 垣花眞人

セラミックス 52 巻 ( 12 ) 頁： 816-819 2017年12月

Synthesis of Rare Earth Niobate and Tantalate Powders via a Peroxo Complex Route 査読有り国際誌

Hideki Kato, Katsuya Shimizu, Kiyotaka Nakajima, Makoto Kobayashi, Masato Kakihana

Chemistry Letters 46 巻 ( 10 ) 頁： 1515 - 1517 2017年10月

Effect of hydroxy and carboxy groups on anisotropic growth of rutile-type titania under hydrothermal conditions 査読有り国際誌

Kobayashi Makoto, Lee Sungho, Kato Hideki, Kakihana Masato

Journal of Asian Ceramic Societies 5 巻 ( 3 ) 頁： 320 - 325 2017年9月

Growth of TiO₂ microspheres with a radially oriented configuration 査読有り国際誌

Quang Duc Truong, Kato Hideki, Kobayashi Makoto, Kakihana Masato

CrystEngComm 19 巻 ( 32 ) 頁： 4832 - 4837 2017年8月

Photoluminescence Properties of Double Perovskite Tantalates Activated with Mn4+, AE₂LaTaO₆:Mn⁴⁺ (AE = Ca, Sr, and Ba) 査読有り国際誌

Yohei Takeda, Hideki Kato, Makoto Kobayashi, Shunsuke Nozawa, Hisayoshi Kobayashi, Masato Kakihana

Journal of Physical Chemistry C 121 巻 ( 34 ) 頁： 18837 - 18844 2017年8月

水溶媒を用いた結晶成長の展開招待有り査読有り

小林亮

セラミックス 52 巻 ( 7 ) 頁： 502-503 2017年7月

Synthesis and photocatalytic properties of tetragonal tungsten bronze type oxynitrides 査読有り国際誌

Shimizu Katsuya, Kato Hideki, Kobayashi Makoto, Kakihana Masato

Applied Catalysis B: Environmental 206 巻頁： 444 - 448 2017年6月

Synthesis, Structure, and Photoluminescence of a Novel Oxynitride BaYSi₂O₅N Activated by Eu²⁺ and Ce³⁺ 査読有り国際誌

Makoto Kobayashi, Takuya Yasunaga, Hironori Sato, Hideki Kato, Kotaro Fujii, Masatomo Yashima, Masato Kakihana

Chemistry Letters 46 巻 ( 6 ) 頁： 795 - 797 2017年6月

Site occupancy and luminescence properties of Ca₃Ln(AlO)₃(BO₃)₄:Ce³⁺,Tb³⁺,Mn²⁺ (Ln = Y, Gd) 査読有り国際誌

Wen Dawei, Kato Hideki, Kobayashi Makoto, Yamamoto Shunsuke, Mitsuishi Masaya, Kakihana Masato

Journal of Materials Chemistry C 5 巻 ( 18 ) 頁： 4578 - 4583 2017年5月

Investigation of the Up-conversion Properties of Er-Yb-doped Calcium Tantalates with Various Ca/Ta Ratios 査読有り国際誌

Tamura Sayaka, Iwaoka Michio, Sato Yasushi, Kobayashi Makoto, Kakihana Masato, Tomita Koji

Journal of Photopolymer Science and Technology 30 巻 ( 4 ) 頁： 507 - 512 2017年

記述言語：英語掲載種別：研究論文（学術雑誌）

Er3+/Yb3+ co-doped calcium tantalate up-conversion (UC) phosphors were synthesized via a parallel synthesis scheme using the gelable citrate complex method. Samples with various Ca/Ta atomic ratios were prepared, and their UC emission properties were compared. Under 980-nm near-infrared laser excitation, α-Ca2Ta2O7 : Er3+, Yb3+ showed an extremely weak UC emission intensity and CaTa4O11 : Er3+, Yb3+ demonstrated an excellent UC emission intensity. In addition, the local symmetry around the rare-earth dopant ions affected the UC luminescence properties.

DOI： 10.2494/photopolymer.30.507

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真空加圧焼成炉を利用した新規酸窒化物蛍光体の探索招待有り

加藤英樹, 佐藤大典, 安永拓矢, 小林亮, 垣花眞人, 磯部史佳

島津評論 73 巻 ( 3・4 ) 頁： 129-135 2016年12月

Synthesis and Development of Titania with Controlled Structures 招待有り査読有り

Makoto Kobayashi

Journal of the Ceramic Society of Japan 124 巻 ( 9 ) 頁： 863-869 2016年9月

Screening of Er³⁺/Yb³⁺ Co-doped RE-Ta-O and RE-Nb-O (RE = Y, La, or Gd) Up-conversion Phosphors 査読有り国際誌

Sayaka Tamura, Michio Iwaoka, Yasushi Sato, Makoto Kobayashi, Masato Kakihana, Koji Tomita

Chemistry Letters 45 巻 ( 8 ) 頁： 890 - 891 2016年8月

Anomalous Orange Light Emitting (Sr,Ba)₂SiO₄:Eu²⁺ Phosphors for Warm White LEDs 査読有り国際誌

Dawei Wen, Hiroki Kuwahara, Hideki Kato, Makoto Kobayashi, Yasushi Sato, Takaki Masaki, Masato Kakihana

ACS Applied Materials & Interfaces 8 巻 ( 18 ) 頁： 11615 - 20 2016年5月

Anisotropy in Conformation and Dynamics of a Glycolate Ion Near the Surface of a TiO₂ Rutile Crystal Between Its {001} and {110} Planes: A Molecular Dynamics Study 査読有り国際誌

Hiroki Nada, Makoto Kobayashi, Masato Kakihana

Journal of Physical Chemistry C 120 巻 ( 12 ) 頁： 6502 - 6514 2016年3月

Effect of Site Occupancy on Deep-red Emission from Eu²⁺-activated Ca₂SiO₄ Phosphor 査読有り国際誌

Hiroki Kuwahara, Yasushi Sato, Hideki Kato, Makoto Kobayashi, Takaki Masaki, Masato Kakihana

Chemistry Letters 45 巻 ( 3 ) 頁： 321 - 323 2016年3月

Self-assembly of polyethyleneamine-intercalated H₂Ti₂O₅ nanoparticles into spherical agglomerates 査読有り国際誌

Kobayashi Makoto, Kato Hideki, Kakihana Masato

Journal of Materials Research 31 巻 ( 5 ) 頁： 564 - 572 2016年3月

水熱法によるバリウムタンタレートナノシート光触媒の合成とその水分解活性査読有り

高杉壮一, 冨田恒之, 岩岡道夫, 小林亮, 加藤英樹, 垣花眞人

Journal of the Society of Inorganic Materials, Japan 23 巻 ( 380 ) 頁： 25-29 2016年

酸化チタン多形の水熱結晶成長(<特集>水が関係する結晶成長のトピックス) 招待有り査読有り国際誌

小林亮, 加藤英樹, 垣花眞人

日本結晶成長学会誌 42 巻 ( 4 ) 頁： 283-289 2016年

記述言語：日本語掲載種別：研究論文（学術雑誌）

Control of crystal growth is rather important in the field of materials, because the shape directly affects their functional abilities. Our research group engages in hydrothermal synthesis of titanium dioxide, which is regarded as one of the representative ceramics, using water-soluble titanium complexes. The high chemical stability and peculiar molecule structures of these titanium complexes allowed us to use various compounds which play a role in control of crystal growth, resulting in the selective synthesis of four titanium dioxide polymorphs, that is, rutile, anatase, brookite and TiO_2(B), with a controlled shape. This paper summarizes our past study and reported researches on synthesis of titania polymorph crystals by classification of zero-, one-, two-, and three-dimensional structures.

DOI： 10.19009/jjacg.42.4_283

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水熱法によるバリウムタンタレートナノシート光触媒の合成とその水分解活性査読有り国際誌

高杉壮一, 冨田恒之, 岩岡道夫, 小林亮, 加藤英樹, 垣花眞人

Journal of the Society of Inorganic Materials, Japan 23 巻 ( 380 ) 頁： 25-29 2016年

Graphene/M_xWO₃ (M = Na, K) nanohybrids with excellent electrical properties 査読有り国際誌

Bin Liu, Shu Yin, Xiaoyong Wu, Yuhua Wang, Yunfang Huang, Jihuai Wu, Tohru Sekino, Junichi Matsushita, Soo Wohn Lee, Makoto Kobayashi, Masato Kakihana, Tsugio Sato

Carbon 94 巻頁： 309 - 316 2015年11月

Large Redshifts in Emission and Excitation from Eu²⁺-Activated Sr₂SiO₄ and Ba₂SiO₄ Phosphors Induced by Controlling Eu²⁺ Occupancy on the Basis on Crystal-Site-Engineering 査読有り国際誌

Yasushi Sato, Hiroki Kuwahara, Hideki Kato, Makoto Kobayashi, Takaki Masaki, Masato Kakihana

Optics and Photonics Journal 5 巻 ( 11 ) 頁： 326-333 2015年11月

Photoluminescence Properties of Mn⁴+-activated Perovskite-type Titanates, La₂MTiO₆:Mn⁴⁺ (M = Mg and Zn) 査読有り国際誌

Yohei Takeda, Hideki Kato, Makoto Kobayashi, Hisayoshi Kobayashi, Masato Kakihana

Chemistry Letters 44 巻 ( 11 ) 頁： 1541 - 1543 2015年11月

記述言語：英語掲載種別：研究論文（学術雑誌）

It has been found that Mn4+-activated La2MTiO6 (M = Mg and Zn) functions as novel Eu-free phosphors for red emission in this work. La2MTiO6:Mn4+ exhibited emission with a peak at 710 nm under excitation by ultraviolet to blue light (300–550 nm). La2MgTiO6:Mn4+ exhibited stronger emission than La2ZnTiO6:Mn4+. The internal quantum yield of La2MgTiO6:Mn4+ was 58.7% under the excitation at 330 nm.

DOI： 10.1246/cl.150748

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A Facile One-Step Solvothermal Synthesis and Electrical Properties of Reduced Graphene Oxide/Rod-Shaped Potassium Tungsten Bronze Nanocomposite. 査読有り国際誌

Liu B, Yin S, Wang Y, Guo C, Wu X, Dong Q, Kobayashi M, Kakihana M, Sato T

Journal of Nanoscience and Nanotechnology 15 巻 ( 9 ) 頁： 7305 - 10 2015年9月

Synthesis of picolinate-iron(III) compounds through an aqueous solution process 査読有り国際誌

Sato Junki, Kobayashi Makoto, Kato Hideki, Kwon Eunsang, Kakihana Masato

JOURNAL OF THE CERAMIC SOCIETY OF JAPAN 123 巻 ( 1441 ) 頁： 751 - 755 2015年9月

記述言語：英語掲載種別：研究論文（学術雑誌）

A novel picolinate-iron(III) compound, Fe(C6H4NO2)2(OH) (1), was synthesized from an aqueous solution of a picolinate-iron(II) complex. Compound 1 was obtained by a thermal treatment of the picolinate-iron complex aqueous solution, whose pH was adjusted to 3–7, containing more than twice molar picolinic acid (Hpa) to Fe at 353 K for 72 h. When the iron aqueous solution in the presence of more than six times molar Hpa to Fe at pH 2–5 was heated, Fe(C6H4NO2)3·H2O (2) appeared. Millimeter-sized yellow-green single crystals of 2 could be obtained by the heat treatment of the picolinate-iron aqueous solution, whose pH was adjusted to 3, with Fe2+:Hpa = 1:10 at 373 K for 72 h. Formation mechanism of 1 and 2 was also discussed through investigations of relationship between synthesis conditions and products. Our approach opens a promising new route for preparation of precursors for synthesis of high functional ceramics and development of new organic–inorganic hybrids.

DOI： 10.2109/jcersj2.123.751

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Novel Titanium Complexes with a Reversible Structural Change on Solvent Adsorption and Desorption 査読有り国際誌

Makoto Kobayashi, Tatsuya Okuhara, Hideki Kato, Sota Sato, Masato Kakihana

Chemistry Letters 44 巻 ( 8 ) 頁： 1050 - 1052 2015年8月

記述言語：英語掲載種別：研究論文（学術雑誌）

Two novel pyrazine-2-carboxylate titanium complexes were synthesized from an aqueous solution (1) and 1 in N,N-dimethylformamide (DMF) (2). The structure of 2 was determined to be [Ti6O8(C4H3N2COO)8(C3H7NO)4]·4C3H7NO·H2O by single-crystal X-ray analysis. Both complexes exhibited solvent adsorption–desorption accompanying reversible structural change. 1 and 2 were compatible, and 1 was vital for the synthesis of 2. The degassed 1 showed gate adsorption property for water vapor.

DOI： 10.1246/cl.150393

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Discovery of Novel Delafossite-type Compounds Composed of Copper(I) Lithium Titanium with Photocatalytic Activity for H₂ Evolution under Visible Light 査読有り国際誌

Hideki Kato, Tsuyoshi Fujisawa, Makoto Kobayashi, Masato Kakihana

Chemistry Letters 44 巻 ( 7 ) 頁： 973 - 975 2015年7月

Hierarchical structures of rutile exposing high-index facets 査読有り国際誌

Quang Duc Truong, Kato Hideki, Kobayashi Makoto, Kakihana Masato

JOURNAL OF CRYSTAL GROWTH 418 巻頁： 86 - 91 2015年5月

水に分散可能な無機Siクラスターを活用した水溶液プロセスによるケイ酸塩蛍光体の合成査読有り国際誌

佐藤泰史, 加藤英樹, 小林亮, 金知慧, 垣花眞人

粉体および粉末冶金 62 巻 ( 4 ) 頁： 127 - 133 2015年4月

記述言語：日本語掲載種別：研究論文（学術雑誌）

ABSTRACT In this paper, we demonstrated the synthesis of silicate-based phosphors by solution techniques using glycol-modified silane (GMS) as a Si source. GMS is a water-dispersible inorganic Si cluster, which is vitally involatile and nonflammable compounds, compared to volatile and flammable Si-alkoxides such as tetraethoxysilane (TEOS). Therefore, GMS has allowed the silicon containing compounds to be synthesized through various solution processes for ceramic compounds such as polymerizable complex (PC) and amorphous metal complex (AMC) methods. This paper provides examples of synthesis of new silicate-based phosphors such as NaAlSiO4:Eu2+, BaZrSi3O9:Eu2+, and CaSrSiO4:Eu2+. In addition, other examples of improvement of emission for conventional silicate-based phosphors, Y2SiO5:Ce3+-Tb3+ and Zn2SiO4:Mn2+, prepared by the above solution techniques including homogeneous precipitation using GMS are also given in this paper.

DOI： 10.2497/jjspm.62.127

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Design of Crystal Structures, Morphologies, and Functionalities of Titanium Oxide Using Water-soluble Complexes and Molecular Control Agents 招待有り査読有り国際誌

Makoto Kobayashi, Minoru Osada, Hideki Kato, Masato Kakihana

Polymer Journal 47 巻 ( 2 ) 頁： 78 - 83 2015年2月

Crystal structures and luminescence properties of Eu²⁺-activated new NaBa_0.5Ca_0.5PO₄ and Na₃Ba₂Ca(PO₄)₃. 査読有り国際誌

Minsung Kim, Makoto Kobayashi, Hideki Kato, Hisanori Yamane, Yasushi Sato, Masato Kakihana

Dalton transactions 44 巻 ( 4 ) 頁： 1900 - 4 2015年1月

Controlled radical polymerization of styrene with magnetic iron oxides prepared through hydrothermal, bioinspired, and bacterial processes 査読有り国際誌

Arihiro Kanazawa, Kotaro Satoh, Shokyoku Kanaoka, Masato Kakihana, Makoto Kobayashi, Junki Sato, Hiroaki Imai, Yuya Oaki, Atsushi Arakaki, Kiyofumi Katagiri, Masami Kamigaito, Sadahito Aoshima

RSC Advances 5 巻 ( 63 ) 頁： 51122 - 51129 2015年

Improvement of hydrogen evolution under visible light over Zn_1-2x(CuGa)_xGa₂S₄ photocatalysts by synthesis utilizing a polymerizable complex method 査読有り国際誌

Ciro Scheremeta Quintans, Hideki Kato, Makoto Kobayashi, Hiroshi Kaga, Akihide Iwase, Akihiko Kudo, Masato Kakihana

Journal of Materials Chemistry A 3 巻 ( 27 ) 頁： 14239 - 14244 2015年

Photocatalytic water oxidation under visible light by valence band controlled oxynitride solid solutions LaTaON₂-SrTiO₃ 査読有り国際誌

Hideki Kato, Koichiro Ueda, Makoto Kobayashi, Masato Kakihana Masato

Journal of Materials Chemistry A 3 巻 ( 22 ) 頁： 11824-11829 - 11829 2015年

A carbon modified NaTaO₃ mesocrystal nanoparticle with excellent efficiency of visible light induced photocatalysis 査読有り国際誌

Wu Xiaoyong, Yin Shu, Liu Bin, Kobayashi Makoto, Kakihana Masato, Sato Tsugio

Journal of Materials Chemistry A 2 巻 ( 48 ) 頁： 20832 - 20840 2014年12月

Development of two novel Eu²⁺-activated phosphors in the Na-Sc-Si-O system and their photoluminescence properties 査読有り国際誌

Min Jihong, Yamaguchi Taichi, Kato Hideki, Kobayashi Makoto, Yamane Hisanori, Kakihana Masato

Journal of Luminescence 154 巻頁： 285 - 289 2014年10月

Synthesis of (Ca1-xSrx)(4)Si2O7F2 oxyfluoride solid solutions and their photoluminescence properties activated by Eu2+ ions 査読有り国際誌

Min Jihong, Kato Hideki, Kobayashi Makoto, Sato Yasushi, Kakihana Masato

JOURNAL OF THE CERAMIC SOCIETY OF JAPAN 122 巻 ( 1428 ) 頁： 630 - 633 2014年8月

記述言語：英語掲載種別：研究論文（学術雑誌）

The synthesis of oxyfluoride solid solutions with the composition (Ca1−xSrx)4Si2O7F2 is reported in this study. (Ca1−xSrx)4Si2O7F2 is found to form a solid solution within the entire composition range. Synthesis of Sr4Si2O7F2, which is the first compound in the Sr–Si–O–F system, can be regarded as one of the interesting results of this study. The Eu2+-activated (Ca1−xSrx)4Si2O7F2 solid solutions, except for Sr4Si2O7F2 exhibited photoluminescence under excitation at 300–450 nm at room temperature. The samples with x = 0.25–0.75 showed a broad red emission band with a peak around 630 nm, whereas the Ca4Si2O7F2:Eu2+ (x = 0) showed blue emission with a peak at 470 nm. Thus, the substitution of Sr for Ca in Ca4SiO7F2:Eu2+ changed the photoluminescence properties remarkably.

DOI： 10.2109/jcersj2.122.630

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The significance of phosphate source in the preparation of functional luminescent phosphate materials 査読有り国際誌

Kim Minsung, Kobayashi Makoto, Kato Hideki, Kakihana Masato

JOURNAL OF THE CERAMIC SOCIETY OF JAPAN 122 巻 ( 1428 ) 頁： 626 - 629 2014年8月

記述言語：英語掲載種別：研究論文（学術雑誌）

The stability and reactivity of phosphate raw materials, including two water-soluble phosphates, ethylene glycol-conjugated phosphate (EG-P), and polyethylene glycol-conjugated phosphate (PEG-P) developed by our group, were examined with the aim of synthesizing phosphates with high functionalities. EG-P was found to gradually hydrolyze in an aqueous solution, resulting in the formation of H3PO4, while PEG-P was stable for more than two months. EG-P and PEG-P did not form insoluble materials in aqueous solution in the presence of many other cations, while precipitates were often observed using conventional phosphate raw materials. In particular, there were no precipitates in an aqueous solution of PEG-P in the presence of Ca2+ and Li+ ions, which easily formed insoluble phosphates in a given aqueous condition. Consequently, single-phase LiCaPO4 with high luminescence properties could be obtained by a polymerizable complex method employing PEG-P, while impurity phases were formed using other P sources, and KSrPO4 was formed as a single phase using EG-P and PEG-P.

DOI： 10.2109/jcersj2.122.626

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Tailoring of deep-red luminescence in Ca₂SiO₄:Eu²⁺ 査読有り国際誌

Yasushi Sato, Hideki Kato, Makoto Kobayashi, Takaki Masaki, Dae-Ho Yoon, Masato Kakihana

Angewandte Chemie International Edition 53 巻 ( 30 ) 頁： 7756 - 9 2014年7月

Ca₂SiO₄:Eu²⁺赤色蛍光体の発光特性国際誌

佐藤泰史, 加藤英樹, 小林亮, 垣花眞人

希土類 64 巻頁： 122 - 123 2014年5月

Insights into a selective synthesis of anatase, rutile, and brookite-type titanium dioxides by a hydrothermal treatment of titanium complexes 査読有り国際誌

Yoshizawa Mitsuru, Kobayashi Makoto, Petrykin Valery, Kato Hideki, Kakihana Masato

JOURNAL OF MATERIALS RESEARCH 29 巻 ( 1 ) 頁： 90 - 97 2014年1月

Hydrothermal synthesis of magnetite particles with uncommon crystal facets 査読有り国際誌

Junki Sato, Makoto Kobayashi, Hideki Kato, Takamichi Miyazaki, Masato Kakihana

Journal of Asian Ceramic Societies 2 巻 ( 3 ) 頁： 258 - 262 2014年

Synthesis of Titanium Dioxide Nanocrystals with Controlled Crystal- and Micro-structures from Titanium Complexes 招待有り査読有り

Makoto Kobayashi, Hideki Kato, Masato Kakihana

Nanomaterials and Nanotechnology 3 巻 ( 23 ) 頁： 1-10 2013年12月

水溶性チタン錯体を用いたbrookite型酸化チタン粒子の調製招待有り査読有り

小林亮

Colloid and Interface Communication 38 巻 ( 4 ) 頁： 7-8 2013年12月

水を反応場として用いた機能性無機材料の合成～環境調和型プロセスの設計と新規水溶性金属錯体の開発～招待有り査読有り

小林亮, 垣花眞人

分離技術 41 巻 ( 6 ) 頁： 32(368)-36(372) 2013年12月

A Highly Luminous LiCaPOCa₄:Eu#U2+ Phosphor Synthesized by a Solution Method Employing a Water-Soluble Phosphate Ester 査読有り国際誌

Minsung Kim, Makoto Kobayashi, Hideki Kato, Masato Kakihana

Optics and Photonics Journal 3 巻 ( 6A ) 頁： 13-18 2013年10月

Exploration of New Phosphors Using a Mineral-Inspired Approach in Combination with Solution Parallel Synthesis 招待有り査読有り国際誌

Masato Kakihana, Jihae Kim, Tetsufumi Komukai, Hideki Kato, Yasushi Sato, Makoto Kobayashi, Yuji Takatsuka

Optics and Photonics Journal 3 巻 ( 6A ) 頁： 5-12 2013年10月

Development of a Novel Green Emitting Phosphate Phosphor KSrY(PO₄)₂:Eu⁺² 査読有り国際誌

Akiko Saito, Hideki Kato, Makoto Kobayashi, Yasushi Sato, Masato Kakihana

Optics and Photonics Journal 3 巻 ( 6A ) 頁： 19-24 2013年10月

Synthesis of a Novel Bluish-Green Emitting Oxynitride Ca₃Al₈Si₄O₁₇N₄:Eu⁺² Phosphor in a CaAl_4-xSi_xO_7-xN_x Solid Solution 査読有り国際誌

Jihae Kim, Hideki Kato, Makoto Kobayashi, Yasushi Sato, Masato Kakihana

Optics and Photonics Journal 3 巻 ( 6A ) 頁： 29-33 2013年10月

Enhanced Dielectric Response Induced by Controlled Morphology in Rutile TiO₂ Nanocrystals 査読有り

Minoru Osada, Makoto Kobayashi, Masato Kakihana

Journal of the Ceramic Society of Japan 121 巻 ( 8 ) 頁： 593-597 2013年8月

Luminescence properties of a novel green-emitting phosphate phosphor KSrY(PO₄)₂:Eu²⁺ 査読有り

Akiko Saito, Hideki Kato, Makoto Kobayashi, Masato Kakihana

IMID 2013 Digest 頁： 261-261 2013年8月

Synthesis of new thiogallate phosphors (Ba_1-xSr_x)₄Ga₂S₇:Eu and their luminescence properties 査読有り

Kohei Takeuchi, Takahiko Hasegawa, Hideki Kato, Makoto Kobayashi, Masato Kakihana

IMID 2013 Digest 頁： 260-260 2013年8月

Luminescence properties of a novel green-emitting phosphate phosphor KSrY(PO₄)₂:Eu²⁺ 査読有り国際誌

Akiko Saito, Hideki Kato, Makoto Kobayashi, Masato Kakihana

IMID 2013 Digest 頁： 261-261 2013年8月

Synthesis of new thiogallate phosphors (Ba_1-xSr_x)₄Ga₂S₇:Eu and their luminescence properties 査読有り国際誌

Kohei Takeuchi, Takahiko Hasegawa, Hideki Kato, Makoto Kobayashi, Masato Kakihana

IMID 2013 Digest 頁： 260-260 2013年8月

Synthesis of a LiCaPO₄:Eu²⁺ phosphor by a polymerizable complex method using a novel water-soluble phosphate precursor 国際誌

Minsung Kim, Makoto Kobayashi, Hideki Kato, Masato Kakihana

IMID 2013 Digest 頁： 264 - 264 2013年8月

Photocatalytic Water Splitting over LaTa₇O₁₉ Composed of TaO₇ Pentagonal Bipyramids and TaO₆ Octahedra 査読有り国際誌

Hideki Kato, Arisa Takeda, Makoto Kobayashi, Masato Kakihana

Chemistry Letters 42 巻 ( 7 ) 頁： 744 - 746 2013年7月

Effect of carboxyl group on the visible-light photocatalytic activity of SrTiO₃ nanoparticles 査読有り国際誌

Huihui Li, Shu Yin, Yuhua Wang, Makoto Kobayashi, Satoko Tezuka, Masato Kakihana, Tsugio Sato

Research on Chemical Intermediates 39 巻 ( 4 ) 頁： 1615 - 1621 2013年4月

水を溶媒に用いた機能性酸化物の低温合成のためのグリーンプレカーサーの開発招待有り査読有り

小林亮, 垣花眞人

機能材料 33 巻 ( 1 ) 頁： 4-10 2013年1月

Control of Valence Band Potential and Photocatalytic Properties of Na_xLa_1-xTaO_1+2xN_2-2x Oxynitride Solid Solutions 査読有り国際誌

Koichiro Ueda, Hideki Kato, Makoto Kobayashi, Michikazu Hara, Masato Kakihana

Journal of Materials Chemistry A 1 巻 ( 11 ) 頁： 3667 - 3674 2013年

Fabrication of SrTiO₃ exposing characteristic facets using molten salt flux and improvement of photocatalytic activity for water splitting 査読有り国際誌

Hideki Kato, Makoto Kobayashi, Michikazu Hara, Masato Kakihana

Catalysis Science & Technology 3 巻 ( 7 ) 頁： 1733 - 1738 2013年

Enhancement of luminescence properties of a KSrPO₄:Eu²+ phosphor prepared using a solution method with a water-soluble phosphate oligomer 査読有り国際誌

Kim Minsung, Kobayashi Makoto, Kato Hideki, Kakihana Masato

JOURNAL OF MATERIALS CHEMISTRY C 1 巻 ( 36 ) 頁： 5741 - 5746 2013年

Orange emission from new (Ba_1-XSr_X)₄Al₂S₇:Eu²⁺ thioaluminate phosphors with visible light excitation 査読有り国際誌

Takahiko Hasegawa, Hideki Kato, Yuji Takatsuka, Makoto Kobayashi, Hisanori Yamane, Masato Kakihana

ECS Journal of Solid State Science & Technology 2 巻 ( 2 ) 頁： R3107 - R3111 2013年

Photocatalytic activities of Cu_3xLa_1-xTa₇O₁₇ solid solutions for H₂ evolution under visible light irradiation 査読有り国際誌

Hideki Kato, Arisa Takeda, Makoto Kobayashi, Michikazu, Hara, Masato Kakihana

Catalysis Science & Technology 3 巻 ( 12 ) 頁： 3147 - 3154 2013年

Synthesis of spindle and square bipyramid-shaped anatase-type titanium dioxide crystals by a solvothermal method using ethylenediamine 査読有り国際誌

Kobayashi Makoto, Kato Hideki, Kakihana Masato

JOURNAL OF THE CERAMIC SOCIETY OF JAPAN 120 巻 ( 1407 ) 頁： 494 - 499 2012年11月

記述言語：英語掲載種別：研究論文（学術雑誌）

Morphological control as well as formation of nanoparticles of anatase-type titanium dioxide has been achieved by a solvothermal treatment of a water-soluble citratoperoxotitanium (CPT) complex using ethylenediamine (EDA) as a key solvent in the presence of a given amount of water. When the EDA concentration in the whole solvent (EDA + H2O) remained low less than 12 M, the powder obtained after the solvothermal treatment consisted of spindle-like anatase particles. With an increase of the EDA concentration in the solvent, the shape of the obtained particles changed from spindle to square bipyramid. When another water-soluble oxoglycolatoperoxotitanate complex or TiCl4 was used as a starting source of Ti, similar shaped anatase particles could be obtained by a careful choice of synthetic conditions. Using a mixed solvent of EDA and water, sheet-like titanic acid was produced as an intermediate phase, regardless of the EDA concentration. Therefore, the formation of anatase in the current system may take place through dissolution-recrystallization of titanic acid. The formation of square bipyramidal anatase particle achieved in the present study is not agreement with a reported theoretical calculation of equilibrium phase, because the calculation reveals that truncated square bipyramid-like anatase is obtained under an acidic condition and spindle-like anatase was formed under a basic condition. An adsorption of EDA on particle surface and the pH of the solvent may contribute to the achievement of morphological control.

DOI： 10.2109/jcersj2.120.494

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Synthesis of new thioaluminate phosphors (Ba_1-XSr_X)₄Al₂S₇:Eu and their luminescence properties 査読有り

Takahiko Hasegawa, Makoto Kobayashi, Hideki Kato, Hisanori Yamane, Masato Kakihana

Technical digest of the 12th International Meeting on Information Display 頁： 640-641 2012年8月

Impact of synthesis methodology on the optimization of photoluminescence emission intensity of NaBaScSi₂O₇:Eu²⁺ phosphor 査読有り国際誌

Sudeshna Ray, Kenji Toda, Shinnosuke Kamei, Tadashi Ishigaki, Kazuyoshi Uematsu, Mineo Sato, Hideki Kato, Makoto Kobayashi, Masato Kakihana

Technical digest of the 12th International Meeting on Information Display 頁： 128 - 129 2012年8月

Synthesis of the new compound in a Na-Sc-Si-O system and Luminescence properties activated by Eu²⁺ 査読有り国際誌

Jihong Min, Hideki Kato, Makoto Kobayashi, Hisanori Yamane, Masato Kakihana

Technical digest of the 12th International Meeting on Information Display 頁： 638-639 2012年8月

Synthesis of new thioaluminate phosphors (Ba_1-xSr_x)₄Al₂S₇:Eu and their luminescence properties 査読有り国際誌

Takahiko Hasegawa, Makoto Kobayashi, Hideki Kato, Hisanori Yamane, Masato Kakihana

Technical digest of the 12th International Meeting on Information Display 頁： 640-641 2012年8月

Synthesis of KSrPO₄:Eu²⁺ Phosphor with High Luminescence Property Using a Water-Soluble Phosphorus Precursor 査読有り国際誌

Minsung Kim, Makoto Kobayashi, Hideki Kato, Masato Kakihana

Technical digest of the 12th International Meeting on Information Display 頁： 130-131 2012年8月

Preparation of Hollow TiO² Spheres of the Desired Polymorphs by Layer-by-Layer Assembly of a Water-Soluble Titanium Complex and Hydrothermal Treatment 査読有り国際誌

Katagiri Kiyofumi, Inami Hitoshi, Koumoto Kunihito, Inumaru Kei, Tomita Koji, Kobayashi Makoto, Kakihana Masato

EUROPEAN JOURNAL OF INORGANIC CHEMISTRY ( 20 ) 頁： 3267 - 3272 2012年7月

Morphology-Controlled Synthesis of W₁₈O₄₉ Nanostructures and Their Near-Infrared Absorption Properties 査読有り国際誌

Guo Chongshen, Yin Shu, Yan Mei, Kobayashi Makoto, Kakihana Masato, Sato Tsugio

INORGANIC CHEMISTRY 51 巻 ( 8 ) 頁： 4763 - 71 2012年4月

Hydrothermal synthesis of brookite-type titanium dioxide with snowflake-like nanostructures using a water-soluble citratoperoxotitanate complex 査読有り国際誌

Makoto Kobayashi, Valery Petrykin, Koji Tomita, Masato Kakihana

Jpurnal of Crystal Growth 337 巻 ( 1 ) 頁： 30 - 37 2011年12月

Hydrothermal synthesis of hierarchical TiO₂ microspheres using a novel titanium complex coordinated by picolinic acid 査読有り国際誌

Quang Due Truong, Kobayashi Makoto, Kato Hideki, Kakihana Masato

JOURNAL OF THE CERAMIC SOCIETY OF JAPAN 119 巻 ( 1390 ) 頁： 513 - 516 2011年

記述言語：英語掲載種別：研究論文（学術雑誌）

Phase- and morphology-control of TiO2 was performed by a facile hydrothermal method using a novel water-soluble titanium–picolinato complex as a precursor. Single-phase rutile or brookite type titania can be obtained by tailoring the pH of the complex solution. Rutile with a hierarchical microstructure was synthesized using an excess amount of ligand as an additive and the final product consisted of microspheres with mesopores formed by a self-assembly of nanorods. The anisotropic growth of nanorods with a high aspect ratio was explained by a capping mechanism.

DOI： 10.2109/jcersj2.119.513

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Application of Water-Soluble Titanium Complexes as Precursors for Synthesis of Titanium-Containing Oxides via Aqueous Solution Processes 招待有り査読有り国際誌

Masato Kakihana, Makoto Kobayashi, Koji Tomita, Valery Petrykin

Bulletin of Chemical Society of Japan 83 巻 ( 11 ) 頁： 1285 - 1308 2010年11月

記述言語：英語掲載種別：研究論文（学術雑誌）

The growing significance of nanocrystalline inorganic functional materials in the fields of catalysis, electronics, and energy conversion together with the increasing demand of the society for safer, softer, and “greener” technologies has drawn considerable attention of the researchers toward water-based solution processes for synthesis of such materials. In this respect complex oxides, containing d0-transition metals, such as Ti, Nb, Ta, or Si represent an outstanding challenge for materials chemists due to the extremely narrow range or almost complete absence of suitable precursor compounds compatible with aqueous systems. In the recent 10 years, a remarkable progress has been achieved in the development of new water-soluble complexes of titanium and considerable experience was accumulated in the application of these compounds for synthesis of nanocrystalline titanium-containing materials. The essential knowledge of coordination chemistry of such water-soluble titanium complexes is reviewed in this work, which succeeded to identify the key structural features responsible for stability of the compounds against hydrolysis and to provide guidelines for synthesis of these complexes. Finally, an extensive overview of highly selective aqueous solution based synthesis of TiO2 polymorphs as well as complex oxide materials with the help of the novel water-soluble titanium complexes is provided.

DOI： 10.1246/bcsj.20100103

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酸化チタンのテーラメイド合成招待有り査読有り

小林亮, 垣花眞人

現代化学 465 巻 ( 12 ) 頁： 57-62 2009年11月

新規水溶性チタン錯体を用いた水熱法による酸化チタン多形の選択的合成招待有り査読有り国際誌

垣花眞人, 小林亮, Petrykin Valery, 冨田恒之

粉体および粉末冶金 56 巻 ( 4 ) 頁： 188-193 2009年4月

記述言語：日本語掲載種別：研究論文（学術雑誌）

A panel of new stable and water soluble complexes of titanium (IV) with natural hydroxy-carboxylic acids such as citric, tartaric, lactic or glycolic acid as ligands was developed. A typical structure of these complex ions includes a peroxo-group, and a hydroxy-carboxylic acid molecule attached to the metal ion by carboxylic and hydroxylic groups to form stable species. The tight coordination and negative charge of complex ions are responsible for stability of these new compounds in water solutions in a wide range of temperatures and pH. Use of natural non-toxic ligands and ammonium as counterions make such titanium compounds convenient reagents for "green" synthesis of titanium containing materials by aqueous solution methods. The architecture of titanium complexes includes structural motifs of different polymorphic forms of TiO2, which allows for application of these compounds as building blocks (tecton) for synthesis of titania with different crystal structures by a simple hydrothermal processes. In this way anatase, rutile, TiO2(B) and brookite were prepared in a reproducible and highly selective way. For the first time TiO2(B) and brookite were synthesized as single phase nano-crystals by a "one-pot" hydrothermal process, and their outstanding photo-catalytic activities were revealed.

DOI： 10.2497/jjspm.56.188

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Hydrothermal synthesis of brookite type TiO₂ photocatalysts using a water-soluble Ti-complex coordinated by ethylenediaminetetraacetic acid 査読有り国際誌

Yusuke Morishima, Makoto Kobayashi, Valery Petrykin, Shu Yin, Tsugio Sato, Masato Kakihana, Koji Tomita

Journal of the Ceramic Society of Japan 117 巻 ( 1363 ) 頁： 320 - 325 2009年3月

Photocatalytic activity of nanocrystalline TiO₂(B) synthesized from titanium glycolate complex by hydrothermal method 査読有り国際誌

Kazuhiro Yamamoto, Hironori Shimoita, Koji Tomita, Kazumi Fujita, Makoto Kobayashi, Valery Petrykin, Masato Kakihana

Journal of the Ceramic Society of Japan 117 巻 ( 1363 ) 頁： 347 - 350 2009年3月

記述言語：英語掲載種別：研究論文（学術雑誌）

The metastable phase of TiO_2(B), one of the polymorphs of titanium dioxide (TiO_2), was prepared by a hydrothermal treatment of a titanium glycolate complex ([Ti_4(C_2H_2O_3)_4(C_2H_3O_3)_2(O_2)_4O_2]^<6->) at 473K for 1-72h in the presence of H_2SO_4. Characterization by X-ray diffraction (XRD) and transmission electron microscopy (TEM) revealed that the obtained samples were composed of single phase TiO_2(B) and the particles had plate-like morphology. After post-synthetic hydrothermal crystal growth (PHCG) applied to the as-prepared sample, thicker plate-like shaped particles were obtained. The photocatalytic activities of the samples obtained by the hydrothermal treatment and after the subsequent PHCG were evaluated in terms of methanol decomposition.

DOI： 10.2109/jcersj2.117.347

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チタン錯体水溶液からの酸化チタン光触媒の合成招待有り査読有り

小林亮, Petykin Valery, 垣花眞人, 冨田恒之

化学工業 60 巻 ( 1 ) 頁： 71-77 2009年1月

Hydrothermal Synthesis and Photocatalytic Activity of Whisker-Like Rutile-Type Titanium Dioxide 査読有り国際誌

Makoto Kobayashi, Valery Petrykin, Masato　Kakihana, Koji Tomita

Journal of the American Ceramic Society 92 巻 ( 1 ) 頁： S21 - S26 2009年1月

Synthesis of TiO₂(B) using glycolato titanium complex and post-synthetic hydrothermal crystal growth of TiO₂(B) 査読有り国際誌

Kazuhiro Yamamoto, Koji Tomita, Kazumi Fujita, Makoto Kobayashi, Valery Petrykin, Masato Kakihana, M.

Journal of Crystal Growth 311 巻 ( 3 ) 頁： 619 - 622 2009年1月

Selective synthesis of nano-crystalline TiO₂ polymorphs from new water-soluble titanium complexes 査読有り

Masato Kakihana, Makoto Kobayashi, Valery Petrykin, Koji Tomita

Acta Crystallographica Section A ( 64 ) 頁： C20 2008年8月

Direct synthesis of brookite-type titanium oxide by hydrothermal method using water-soluble titanium complexes 査読有り国際誌

Makoto Kobayashi, Koji Tomita, Valery Petrykin, Masahiro Yoshimura, Masato Kakihana

Journal of Materials Science 43 巻 ( 7 ) 頁： 2158 - 2162 2008年4月

Hydrothermal synthesis of TiO₂ nano-particles using novel water-soluble titanium complexes 査読有り国際誌

Koji Tomita, Makoto Kobayashi, Valery Petrykin, Shu Yin, Tsugio Sato, Masahiro Yoshimura, Masato Kakihana

Journal of Materials Science 43 巻 ( 7 ) 頁： 2217 - 2221 2008年4月

New water-soluble complexes of titanium with amino acids and their application for synthesis of TiO₂ nanoparticles 査読有り国際誌

Makoto Kobayashi, Valery Petrykin, Koji Tomita, Masato Kakihana

Journal of the Ceramic Society of Japan 116 巻 ( 1352 ) 頁： 578 - 583 2008年4月

INOR 1052-Synthesis of oxide materials using new water soluble titanium and tantalum complexes 査読有り国際誌

Valery Petrykin, Makoto Kobayashi, Koji Tomita, Masato Kakihana

ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY 235 巻 2008年4月

Microwave-assisted hydrothermal synthesis of brookite nanoparticles from a water-soluble titanium complex and their photocatalytic activity 査読有り国際誌

Yusuke Morishima, Makoto Kobayashi, Valery Petrykin, Masato Kakihana, Koji Tomita

Journal of the Ceramic Society of Japan 115 巻 ( 1348 ) 頁： 826 - 830 2007年12月

Morphology control of rutile nanoparticles in a hydrothermal synthesis from water-soluble titanium complex aqueous solution 査読有り国際誌

Makoto Kobayashi, Valery Petrykin, Masato Kakihana, Koji Tomita

Journal of the Ceramic Society of Japan 115 巻 ( 1348 ) 頁： 835 - 839 2007年12月

One-step synthesis of TiO₂(B) nanoparticles from a Water-Soluble titanium complex 査読有り国際誌

Makoto Kobayashi, Valery V. Petrykin, Masato Kakihana, Koji Tomita, Masahiro Yoshimura

Chemistry of Materials 19 巻 ( 22 ) 頁： 5373-5376 2007年10月

ゾル－ゲルコーティング材料としての新規水溶性チタン錯体招待有り査読有り

垣花眞人, 冨田恒之, 小林亮

化学工業 57 巻 ( 12 ) 頁： 13-19 2006年12月

Hydrothermal synthesis of nanosized titania photocatalysts using novel water-soluble titanium complexes 査読有り国際誌

Makoto Kobayashi, Koji Tomita, Valery Petrykin, Syu Yin, Tsugio Sato, Masahiro Yoshimura, Masato Kakihana

Solid State Phenomena 124-126 巻頁： 723-726 2006年9月

A Water-soluble Titanium Complex for the Selective Synthesis of Nanocrystalline Brookite, Rutile, and Anatase by a Hydrothermal Method 査読有り国際誌

Koji Tomita, Valery Petrykin, Makoto Kobayashi, Motoo Shiro, Masahiro Yoshimura, Masato Kakihana

Angewandte Chemie International Edition 45 巻 ( 15 ) 頁： 2378 - 81 2006年4月

水溶液から酸化チタンを作る招待有り査読有り

小林亮, 冨田恒之, 垣花眞人

色材協会コラム ( 20 ) 頁： 1 2006年

水溶性プロセスを利用したセラミックスの合成招待有り査読有り

冨田恒之, 小林亮, 垣花眞人

未来材料 5 巻 ( 10 ) 頁： 37 - 43 2005年10月

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