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  • Microfluidic Plasma-Based Continuous and Tunable Synthesis of Ag-Au Nanoparticles and Their SERS Properties

    Author(s)
    Lin, Liangliang
    Li, Xuanhe
    Gao, Haiyan
    Xu, Hujun
    Starostin, Sergey A
    Ostrikov, Kostya Ken
    Hessel, Volker
    Griffith University Author(s)
    Ostrikov, Ken
    Year published
    2021
    Metadata
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    Abstract
    This work reports on an effective approach for the continuous synthesis of Ag–Au nanoparticles (NPs) by integrating low-temperature plasma with a microfluidic technique. Crystalline Ag–Au nanoalloys are demonstrated to be produced, and the composition of the nanoalloys can be effectively tuned in-flight by controlling the concentrations or the flow rates of the reactants. The surface-enhanced Raman scattering (SERS) properties of the NPs are further validated through the detection of rhodamine 6G and crystal violet (CV) analytes. The silicon substrates coated with the Ag–Au NPs have reproducible morphology and thickness, and ...
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    This work reports on an effective approach for the continuous synthesis of Ag–Au nanoparticles (NPs) by integrating low-temperature plasma with a microfluidic technique. Crystalline Ag–Au nanoalloys are demonstrated to be produced, and the composition of the nanoalloys can be effectively tuned in-flight by controlling the concentrations or the flow rates of the reactants. The surface-enhanced Raman scattering (SERS) properties of the NPs are further validated through the detection of rhodamine 6G and crystal violet (CV) analytes. The silicon substrates coated with the Ag–Au NPs have reproducible morphology and thickness, and can significantly enhance the Raman signals, where nanoalloys show much higher Raman responses compared to monometallic Ag and Au NPs. The Ag–Au-functionalized SERS platforms show excellent reproducibility and stability, with the detection limits of 10–8 and 10–10 M for the rhodamine 6G (R6G) and CV molecules, respectively. These results indicate that the developed microfluidic plasma method is promising for the continuous and in-flight synthesis of tunable monometallic or multimetallic nanoparticles.
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    Journal Title
    Industrial & Engineering Chemistry Research
    DOI
    https://doi.org/10.1021/acs.iecr.1c04048
    Note
    This publication has been entered as an advanced online version in Griffith Research Online.
    Subject
    Nanotechnology
    Science & Technology
    Engineering, Chemical
    SEED-MEDIATED GROWTH
    Publication URI
    http://hdl.handle.net/10072/411502
    Collection
    • Journal articles

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