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Interfacing Colloidal Graphene Oxide Sheets with Gold Nanoparticles

Authors

  • Dr. Fengli Bei,

    1. Department of Materials Engineering, Monash University, VIC 3800 (Australia), Fax: (+61) 399054940
    2. Key Laboratory for Soft Chemistry and Functional Materials, Ministry of Education, Nanjing University of Science and Technology, Nanjing 210094 (P.R. China)
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  • Dr. Xueliang Hou,

    1. Department of Materials Engineering, Monash University, VIC 3800 (Australia), Fax: (+61) 399054940
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  • Dr. Shery L. Y. Chang,

    1. Monash Centre for Electron Microscopy and School of Chemistry, Monash University, VIC 3800 (Australia)
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  • Prof. George P. Simon,

    1. Department of Materials Engineering, Monash University, VIC 3800 (Australia), Fax: (+61) 399054940
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  • Prof. Dan Li

    Corresponding author
    1. Department of Materials Engineering, Monash University, VIC 3800 (Australia), Fax: (+61) 399054940
    2. ARC Centre of Excellence for Electromaterials Science, Monash University, VIC 3800 (Australia)
    • Department of Materials Engineering, Monash University, VIC 3800 (Australia), Fax: (+61) 399054940
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Abstract

Aqueous solutions of graphene oxide (GO) and citrate-stabilised gold nanoparticles (AuNPs) are two classic, negatively charged colloids. Using the surface plasmon resonance spectra of AuNPs as a probe, we illustrate how the two like-charged colloids interact with each other and in so doing, reveal the unique solution behaviour of GO. We demonstrate that the electrical double layer of the GO sheets in water plays a key role in controlling the interaction between GO and AuNPs, which displays a one-way gate effect. It is shown that GO can capture and disperse AuNPs in water in a controllable fashion, without the need for additional chemical linkers. This discovery allows the successful synthesis of uncapped, yet solution-dispersible metal-nanoparticle assemblies. Such metal nanostructures have long been pursued for nano-plasmonics and sensing applications, but have remained difficult to prepare using conventional polymer dispersants. This work also makes clear that the combination of the two-dimensional conformation of GO along with its large molecular size and self-contained functional groups allows it to act as a unique soluble nanocarrier/substrate (the thinnest, functionalised flat substrate possible in nature) for the synthesis of new, soluble functional materials.

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