Template-free assembly of three-dimensional networks of graphene hollow spheres at the water/toluene interface

Xianjue Chen, Paul Eggers, Ashley Slattery, Samuel Ogden, Colin Raston

    Research output: Contribution to journalArticle

    15 Citations (Scopus)

    Abstract

    Hypothesis: The Pickering emulsion system, generated by amphiphilic graphene oxide (GO) sheets trapped between water/toluene liquid interfaces, can be directly used for template-free formation of three-dimensional (3D) structure of GO hollow spheres. Experiments: The method involves the formation of highly stable micron-sized Pickering emulsions via mild sonication of GO aqueous solution and toluene in the presence of polyvinyl alcohol (PVA), followed by direct freeze-drying of the mixture for preserving the unique 3D hollow spherical structures. Findings: The 3D structure of interconnected GO hollow spheres, with a diameter in the range ~2 to 10. μm, has been prepared. Transmission and scanning electron microscopy analyses confirmed the formation of the 3D structure directly from the Pickering emulsion system. The presence of PVA is critical in supporting the GO hollow spherical structures. Raman analysis confirmed the structural integrity of the GO in the 3D products.

    Original languageEnglish
    Pages (from-to)174-177
    Number of pages4
    JournalJournal of Colloid and Interface Science
    Volume430
    DOIs
    Publication statusPublished - 2014

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