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Diffusion driven layer-by-layer assembly of graphene oxide nanosheets into porous three-dimensional macrostructures

Author

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  • Jianli Zou

    (Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University)

  • Franklin Kim

    (Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University)

Abstract

Despite recent progress in preparing numerous types of nanosheets, it remains a difficult challenge to assemble the tiny building blocks into functional macroscale architectures suitable for practical applications. Here we introduce a diffusion driven layer-by-layer assembly process and demonstrate its application for the construction of graphene oxide sheets into various three-dimensional structures. This process involves complexation of the negatively charged graphene oxide sheets and positively charged branched polyethylenimine at a given interface. We find that the diffusion of branched polyethylenimine molecules allows the complex to continuously grow into foam-like frameworks with tunable porosities. Furthermore, the assembly process is quite robust and can be utilized in various configurations such as to create free-standing architectures with tailored shapes or patterned films on a substrate. With such useful features, we believe that this technique may serve as a valuable tool for the assembly of nanomaterials.

Suggested Citation

  • Jianli Zou & Franklin Kim, 2014. "Diffusion driven layer-by-layer assembly of graphene oxide nanosheets into porous three-dimensional macrostructures," Nature Communications, Nature, vol. 5(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms6254
    DOI: 10.1038/ncomms6254
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