Light Harvesting and Energy Transfer in Multiporphyrin-Modified CdSe Nanoparticles

Authors

  • Soonchul Kang,

    1. Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan, Fax: (+81) 75-383-2571
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  • Masakazu Yasuda,

    1. Department of Chemistry, Graduate School of Engineering Science, Osaka University, 1–3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan, Fax: (+81)-6-6850-6244
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  • Hiroshi Miyasaka Prof.,

    1. Department of Chemistry, Graduate School of Engineering Science, Osaka University, 1–3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan, Fax: (+81)-6-6850-6244
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  • Hironobu Hayashi,

    1. Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan, Fax: (+81) 75-383-2571
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  • Mitsuo Kawasaki Prof.,

    1. Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan, Fax: (+81) 75-383-2571
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  • Tomokazu Umeyama Dr.,

    1. Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan, Fax: (+81) 75-383-2571
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  • Yoshihiro Matano Prof.,

    1. Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan, Fax: (+81) 75-383-2571
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  • Kaname Yoshida Dr.,

    1. Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
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  • Seiji Isoda Prof.,

    1. Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
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  • Hiroshi Imahori Prof.

    1. Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan, Fax: (+81) 75-383-2571
    2. Institute for Integrated Cell-Material Sciences, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
    3. Fukui Institute for Fundamental Chemistry, Kyoto University, 34-4, Takano-Nishihiraki-cho, Sakyo-ku, Kyoto 606-8103, Japan
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Abstract

Multiporphyrin-modified CdSe nanoparticles (CdSe-H2P) were prepared to elucidate the interaction between chromophores and luminescent semiconducting nanoparticles in the excited and ground states. The CdSe-H2P nanoparticles were obtained by place-exchange reactions of hexadecylamine-thiophenol-modified CdSe nanoparticles with porphyrin alkanethiols in toluene. The number of porphyrin molecules on the surface of a single CdSe nanoparticle increased with increasing reaction time to reach a saturated maximum of 21. The porphyrins as well as the core in CdSe-H2P can absorb UV/Vis radiation. Steady-state emission and emission-lifetime measurements reveal efficient energy transfer from the CdSe excited state to the porphyrins in the CdSe-H2P nanoparticles. The resulting porphyrin excited singlet state is not quenched by the CdSe core. These unique properties are in sharp contrast with those of multiporphyrin-modified metal and silica nanoparticles. Thus, semiconducting nanoparticle–multiporphyrin composites are highly promising as novel artificial photosynthetic materials.

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