Papers by Author: Mineo Sato

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Authors: Kenji Toda, Masahito Honda, Yasuaki Orihara, Mineo Sato, Fumikazu Kanamaru
Authors: Kenji Toda, Yoshio Aoyama, Mineo Sato
Authors: Tatsuya Sakamoto, Kazuyoshi Uematsu, Tadashi Ishigaki, Kenji Toda, Mineo Sato
Abstract: We succeeded in the single crystal growth of Ba2SiO4:Eu2+ by novel synthesis method which was gas (SiO) and solid (Ba - Sc - Al - Eu - O) phase hybridized. The Ba2SiO4:Eu2+ single crystal was synthesized by interfacial crystal growth after the reaction of the SiO gas with the surface of Ba - Sc - Al - Eu - O substrate in the reductive atmosphere. The single crystals were plate-like crystals with about 500 μm sizes and emitted green light around 500 nm under 300 - 450 nm excitation.
Authors: Shinichiro Kousaka, Kenji Toda, Tadashi Ishigaki, Kazuyoshi Uematsu, Mineo Sato
Abstract: New red phosphors Na3YSi2O7:Eu3+ was prepared by a conventional solid-state reaction. This silicate phosphor can be efficiently excited by near UV light, yielding an intense red emission. Under the excitation of near UV light, the emission intensity is higher than that of a commercial red phosphor Y2O2S:Eu3+.
Authors: Mamoru Ohashi, Tadashi Ishigaki, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato
Abstract: Photocatalysts for overall water splitting have great potential in solar energy applications. A variety of photocatalysts have shown activity for water splitting. In particular, oxysulfides are the great interest because of their ability to generate H2 and O2 from water under visible light. However, they are generally synthesized under H2S flow, which is an extremely harmful gas for humans. In this study, La2O2S2 was synthesized at low temperature without H2S gas, and its photocatalytic activity was confirmed by hydrogen generation experiments.
Authors: Soihiro Watanabe, Sae Nakajima, Kazuyoshi Uematsu, Tadashi Ishigaki, Kenji Toda, Mineo Sato
Abstract: Fine TiO2 particles were synthesized from titanate precursor, Na16Ti10O28, dissolved in aqueous HNO3 solution. Crystalline rutile TiO2 powders were prepared by reflux of dissolved powders in the aqueous HNO3 solution under 100 °C. Prepared TiO2 powders were characterized by X-ray diffraction, thermogravimetry, scanning electron microscopy and BET specific surface area analysis.
Authors: Kenji Toda, Masato Kawakami, Kazuyoshi Uematsu, Mineo Sato
Authors: Ayano Toda, Kenji Toda, Tadashi Ishigaki, Kazuyuki Uematsu, Mineo Sato
Abstract: Eu3+ doped and undoped Y(P,V)O4 phosphors were prepared using multi-mode and single-mode microwave oven operated at 2.45 GHz. In the case of the microwave heating method, the phosphor particles were non-aggregated. A homogeneous distribution of Eu ion was observed in the microwave synthesis. No sintering behavior found in the microwave heating may be attributed to a quite shorter heating time. The Eu3+ doped sample synthesized by microwave heating showed intense red emission under UV excitation.
Authors: T. Mamiya, Yutaka Kagawa, Y. Shioji, Mineo Sato, T. Yamamura
Authors: Daiki Sakuraba, Kenji Toda, Kazuyoshi Uematsu, Mineo Sato
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