Ryota Takahashi Homepage 

強誘電体材料

　1　焦電性評価装置を用いた新しい強誘電体の探索

　2　光化学反応を用いた強誘電性の制御について

 

　これまでの報告例

• A-site driven ferroelectricity in epitaxial ferromagnetic La2NiMnO6 thin films

        R. Takahashi, I. Ohkubo, K. Yamauchi, M. Kitamura, Y. Sakurai, M. Oshima, T. Oguchi, Y. Cho and M. Lippmaa 

       Phys. Rev. B, 91, 134107 (2015) (arXiv: 1504.04905)

 

• Pyroelectric detection of the spontaneous polarization in magnetite thin films

       R. Takahashi, H. Misumi, M. Lippmaa

       Physical Review B, 86, 144105 (2012) (arXiv: 1209.4735)

 

• Photochemical switching of ultrathin PbTiO3 films

       R. Takahashi, J. K. Grepstad, T. Tybell and Y. Matsumoto

       Applied Physics Letters, 92, 112901 (2008)

 

光触媒材料

　1　可視光応答光触媒の高効率化について

　2　Ag7NO11の合成

 

　これまでの報告例

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• Photoelectrochemical water splitting enhanced by self-assembled metal nanopillars embedded in an oxide semiconductor photoelectrode

       S. Kawasaki, R. Takahashi, T. Yamamoto, M. Kobayashi, H. Kumigashira, J. Yoshinobu, F. Komori, A. Kudo, and M. Lippmaa 

       Nature Communications, 7, 11818 (2016)

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• Photo-electrochemical epitaxy of silver-oxide clathrate Ag7O8M (M=NO3, HSO4) on rutile-type Nb-doped TiO2 single crystals

       R. Tanaka, R. Takahashi, S. Takata, M. Lippmaa, and Y. Matsumoto 

       CrystEngComm, 17, 3701-3707 (2015)

 

• Electronic structure and photoelectrochemical properties of an Ir-doped SrTiO3 photocatalyst

       S. Kawasaki, R. Takahashi, K. Akagi, J. Yoshinobu, F. Komori, K. Horiba, H. Kumigashira, K. Iwashina, A. Kudo, and M. Lippmaa 

       The Journal of Physical Chemistry C, 118, 20222-20228 (2014)

 

• Epilayer control of photodeposited materials during UV photocatalysis

       R. Takahashi, M. Katayama, Ø. Dahl, J. K. Grepstad, Y. Matsumoto, T. Tybell

       Applied Physics Letters, 93, 232901 (2009)

 

自己組織化する酸化物のナノ構造

　1　マグネタイト(Fe3O4)のナノピラミッド構造

　2　Ba-Sn-Oの超構造

　3　Bi4Ti3O12のナノプレート構造

 

　これまでの報告例

• Spontaneous growth of strain-free magnetite nanocrystals via temperature-driven dewetting

       R. Takahashi, H. Misumi, T. Yamamoto, and M. Lippmaa  

       Crystal Growth & Design, 14, 1264-1271 (2014)

 

• Long-range spontaneous structural ordering of barium stannate thin films

       R. Takahashi, K. Valset, E. Folven, E. Eberg, J. K. Grepstad, T. Tybell

       Applied Physics Letters, 97, 081906 (2010)

 

• Nanoskyscraper of ferroelectric Bi4Ti3O12

       R. Takahashi, Y. Yonezawa, K. Nakajima, T. Chikyow, H. Koinuma, Y. Matsumoto

       Applied Physics Letters, 88, 152904 (2006)