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Stiffening of graphene oxide films by soft porous sheets

Author

Listed:
  • Lily Mao

    (Northwestern University)

  • Hun Park

    (Hanyang University
    Northwestern University)

  • Rafael A. Soler-Crespo

    (Northwestern University)

  • Horacio D. Espinosa

    (Northwestern University
    Northwestern University)

  • Tae Hee Han

    (Hanyang University)

  • SonBinh T. Nguyen

    (Northwestern University)

  • Jiaxing Huang

    (Northwestern University)

Abstract

Graphene oxide (GO) sheets have been used as a model system to study how the mechanical properties of two-dimensional building blocks scale to their bulk form, such as paper-like, lamellar-structured thin films. Here, we report that the modulus of multilayer GO films can be significantly enhanced if some of the sheets are drastically weakened by introducing in-plane porosity. Nanometer-sized pores are introduced in GO sheets by chemical etching. Membrane-deflection measurements at the single-layer level show that the sheets are drastically weakened as the in-plane porosity increases. However, the mechanical properties of the corresponding multilayer films are much less sensitive to porosity. Surprisingly, the co-assembly of pristine and etched GO sheets yields even stiffer films than those made from pristine sheets alone. This is attributed to the more compliant nature of the soft porous sheets, which act as a binder to improve interlayer packing and load transfer in the multilayer films.

Suggested Citation

  • Lily Mao & Hun Park & Rafael A. Soler-Crespo & Horacio D. Espinosa & Tae Hee Han & SonBinh T. Nguyen & Jiaxing Huang, 2019. "Stiffening of graphene oxide films by soft porous sheets," Nature Communications, Nature, vol. 10(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-11609-8
    DOI: 10.1038/s41467-019-11609-8
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