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Homogenous Spherical Mosslike Assembly of Pd Nanoparticles by using DNA Compaction: Application of Pd–DNA Hybrid Materials to Volume-Expansion Hydrogen Switches

Authors

  • Yoshiharu Hatakeyama,

    1. Institute of Multidisciplinary Research for Advanced Materials Tohoku University 2-1-1, Katahira, Aoba-ku, Sendai 980-8577 (Japan)
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  • Mitsuo Umetsu,

    1. Institute of Multidisciplinary Research for Advanced Materials Tohoku University 2-1-1, Katahira, Aoba-ku, Sendai 980-8577 (Japan)
    2. Current address: Department of Biomolecular Engineering, Graduate School of Engineering, Tohoku University, 6-6-11, Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan.
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  • Satoshi Ohara,

    1. Institute of Multidisciplinary Research for Advanced Materials Tohoku University 2-1-1, Katahira, Aoba-ku, Sendai 980-8577 (Japan)
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  • Fumihiko Kawadai,

    1. Institute of Multidisciplinary Research for Advanced Materials Tohoku University 2-1-1, Katahira, Aoba-ku, Sendai 980-8577 (Japan)
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  • Seiitch Takami,

    1. Institute of Multidisciplinary Research for Advanced Materials Tohoku University 2-1-1, Katahira, Aoba-ku, Sendai 980-8577 (Japan)
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  • Takashi Naka,

    1. Institute of Multidisciplinary Research for Advanced Materials Tohoku University 2-1-1, Katahira, Aoba-ku, Sendai 980-8577 (Japan)
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  • Tadafumi Adschiri

    Corresponding author
    1. Institute of Multidisciplinary Research for Advanced Materials Tohoku University 2-1-1, Katahira, Aoba-ku, Sendai 980-8577 (Japan)
    • Institute of Multidisciplinary Research for Advanced Materials Tohoku University 2-1-1, Katahira, Aoba-ku, Sendai 980-8577 (Japan).
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  • This work was supported by Industrial Technology Research Grant Program in '05 from New Energy and Industrial Technology Development Organization (NEDO) of Japan (S.O.). This research was also partly supported by a Grant-in-Aid for the COE project, Giant Molecules and Complex Systems, 2002. Supporting Information is available online from Wiley InterScience or from the authors.

Abstract

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The formation of Pd–DNA nanohybrid structures, and the use of these materials as chemiresistive hydrogen sensors is described. Interaction of Pd(II) complexes with λ-DNA leads to formation of a small compacted globular state, and reduction of the Pd(II) complexes results in homogenous spherical mosslike assembly of Pd nanoclusters. The mosslike Pd materials show a unique switch response to hydrogen adsorption.

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