Hybrid Gold-Nanoparticle-Cored Conjugated Thiophene Dendrimers: Synthesis, Characterization, and Energy-Transfer Studies

Authors

  • Dr. Suxiang Deng,

    1. University of Houston, Department of Chemistry and Department of Chemical and Biomolecular Engineering, 4800 Cullen Blvd, Houston, TX 77204-5003 (USA), Fax: (+1) 713-743-1755
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  • Timothy M. Fulghum,

    1. University of Houston, Department of Chemistry and Department of Chemical and Biomolecular Engineering, 4800 Cullen Blvd, Houston, TX 77204-5003 (USA), Fax: (+1) 713-743-1755
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  • Greg Krueger,

    1. University of Houston, Department of Chemistry and Department of Chemical and Biomolecular Engineering, 4800 Cullen Blvd, Houston, TX 77204-5003 (USA), Fax: (+1) 713-743-1755
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  • Derek Patton,

    1. University of Houston, Department of Chemistry and Department of Chemical and Biomolecular Engineering, 4800 Cullen Blvd, Houston, TX 77204-5003 (USA), Fax: (+1) 713-743-1755
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  • Jin-Young Park,

    1. University of Houston, Department of Chemistry and Department of Chemical and Biomolecular Engineering, 4800 Cullen Blvd, Houston, TX 77204-5003 (USA), Fax: (+1) 713-743-1755
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  • Prof. Rigoberto C. Advincula

    Corresponding author
    1. University of Houston, Department of Chemistry and Department of Chemical and Biomolecular Engineering, 4800 Cullen Blvd, Houston, TX 77204-5003 (USA), Fax: (+1) 713-743-1755
    • University of Houston, Department of Chemistry and Department of Chemical and Biomolecular Engineering, 4800 Cullen Blvd, Houston, TX 77204-5003 (USA), Fax: (+1) 713-743-1755
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Abstract

A series of hybrid Au-nanoparticle-dendrimer materials: nanoparticle-cored thiophene dendrimers (NCTDs) were synthesized, characterized, and investigated for their energy-transfer properties. These hybrid nanoparticles were obtained by the simultaneous and in situ reduction of gold(III) chloride and self-assembly of the thiol-containing thiophene dendritic ligands. The dendron ligands were radially attached to the gold nanoparticles and were analyzed by TEM, UV/Vis, 1H NMR, and FTIR spectroscopies. The solution fluorescence of the attached thiophene dendrons are quenched progressively. Both alkyl-chain length and dendron size have significant influence on the energy-transfer efficiency, as well as on core sizes and size distribution of the Au nanoparticles. In spite of the phenomenon’s dependence on nanoparticle size, the energy transfer generally follows the 1/d2 distance dependence. Single NCTD nanoparticles were also adsorbed on highly ordered pyrolytic graphite (HOPG) and uniform aggregates were observed on mica flat substrates.

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