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Synthesis of Au–CdS Core–Shell Hetero-Nanorods with Efficient Exciton–Plasmon Interactions

Authors

  • Min Li,

    1. Department of Physics, Key Laboratory of Artificial, Micro- and Nano-structures of the Ministry of Education and School of Physics and Technology, Wuhan University, Wuhan 430072, P. R. China
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  • Xue-Feng Yu,

    Corresponding author
    1. Department of Physics, Key Laboratory of Artificial, Micro- and Nano-structures of the Ministry of Education and School of Physics and Technology, Wuhan University, Wuhan 430072, P. R. China
    • Department of Physics, Key Laboratory of Artificial, Micro- and Nano-structures of the Ministry of Education and School of Physics and Technology, Wuhan University, Wuhan 430072, P. R. China.
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  • Shan Liang,

    1. Department of Physics, Key Laboratory of Artificial, Micro- and Nano-structures of the Ministry of Education and School of Physics and Technology, Wuhan University, Wuhan 430072, P. R. China
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  • Xiao-Niu Peng,

    1. Department of Physics, Key Laboratory of Artificial, Micro- and Nano-structures of the Ministry of Education and School of Physics and Technology, Wuhan University, Wuhan 430072, P. R. China
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  • Zhong-Jian Yang,

    1. Department of Physics, Key Laboratory of Artificial, Micro- and Nano-structures of the Ministry of Education and School of Physics and Technology, Wuhan University, Wuhan 430072, P. R. China
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  • Ya-Lan Wang,

    1. Department of Physics, Key Laboratory of Artificial, Micro- and Nano-structures of the Ministry of Education and School of Physics and Technology, Wuhan University, Wuhan 430072, P. R. China
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  • Qu-Quan Wang

    Corresponding author
    1. Department of Physics, Key Laboratory of Artificial, Micro- and Nano-structures of the Ministry of Education and School of Physics and Technology, Wuhan University, Wuhan 430072, P. R. China
    • Department of Physics, Key Laboratory of Artificial, Micro- and Nano-structures of the Ministry of Education and School of Physics and Technology, Wuhan University, Wuhan 430072, P. R. China.
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Abstract

The synthesis of large lattice mismatch metal-semiconductor core–shell hetero-nanostructures remains challenging, and thus the corresponding optical properties are seldom discussed. Here, we report the gold-nanorod-seeded growth of Au–CdS core–shell hetero-nanorods by employing Ag2S as an interim layer that favors CdS shell formation through a cation-exchange process, and the subsequent CdS growth, which can form complete core–shell structures with controllable shell thickness. Exciton–plasmon interactions observed in the Au–CdS nanorods induce shell thickness-tailored and red-shifted longitudinal surface plasmon resonance and quenched CdS luminescence under ultraviolet light excitation. Furthermore, the Au–CdS nanorods demonstrate an enhanced and plasmon-governed two-photon luminescence under near-infrared pulsed laser excitation. The approach has potential for the preparation of other metal-semiconductor hetero-nanomaterials with complete core–shell structures, and these Au–CdS nanorods may open up intriguing new possibilities at the interface of optics and electronics.

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