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  • Microplasma-Enabled Graphene Quantum Dot-Wrapped Gold Nanoparticles with Synergistic Enhancement for Broad Band Photodetection

    Author(s)
    Thakur, Mukesh Kumar
    Fang, Chih-Yi
    Yang, Yung-Ta
    Effendi, Tirta Amerta
    Roy, Pradip Kumar
    Chen, Ruei-San
    Ostrikov, Kostya Ken
    Chiang, Wei-Hung
    Chattopadhyay, Surojit
    Griffith University Author(s)
    Ostrikov, Kostya (Ken)
    Year published
    2020
    Metadata
    Show full item record
    Abstract
    Plasmonic nanostructure/semiconductor nanohybrids offer many opportunities for emerging electronic and optoelectronic device applications because of their unique geometries in the nanometer scale and material properties. However, the development of a simple and scalable synthesis of plasmonic nanostructure/semiconductor nanohybrids is still lacking. Here, we report a direct synthesis of colloidal gold nanoparticle/graphene quantum dot (Au@GQD) nanohybrids under ambient conditions using microplasmas and their application as photoabsorbers for broad band photodetectors (PDs). Due to the unique AuNP core and graphene shell ...
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    Plasmonic nanostructure/semiconductor nanohybrids offer many opportunities for emerging electronic and optoelectronic device applications because of their unique geometries in the nanometer scale and material properties. However, the development of a simple and scalable synthesis of plasmonic nanostructure/semiconductor nanohybrids is still lacking. Here, we report a direct synthesis of colloidal gold nanoparticle/graphene quantum dot (Au@GQD) nanohybrids under ambient conditions using microplasmas and their application as photoabsorbers for broad band photodetectors (PDs). Due to the unique AuNP core and graphene shell nanostructures in the synthesized Au@GQD nanohybrids, the plasmonic absorption of the AuNP core extends the usable spectral range of the photodetectors. It is demonstrated that the Au@GQD-based visible light photodetector simultaneously possesses an extraordinary photoresponsivity of ∼103 A/W, ultrahigh detectivity of 1013 Jones, and fast response time in the millisecond scale (65 ms rise time and 53 ms fall time). We suggest that the synergistic effect can be attributed to the strong fluorescence quenching in Au@GQD coupled with the two-dimensional graphene layer in the device. This work provides knowledge of tailoring the optical absorption in GQDs with plasmonic AuNPs and the corresponding photophysics for broad band response in PD-related devices.
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    Journal Title
    ACS Applied Materials & Interfaces
    Volume
    12
    Issue
    25
    DOI
    https://doi.org/10.1021/acsami.0c06753
    Subject
    Chemical Sciences
    Engineering
    Science & Technology
    Nanoscience & Nanotechnology
    Materials Science, Multidisciplinary
    Science & Technology - Other Topics
    Publication URI
    http://hdl.handle.net/10072/397816
    Collection
    • Journal articles

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