研究者詳細 - 小林　亮

論文 - 小林　亮

分割表示 134 件中 61 - 80 件目／全件表示 >>

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

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