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Chemically modified graphene films with tunable negative Poisson’s ratios

Author

Listed:
  • Yeye Wen

    (Tsinghua University)

  • Enlai Gao

    (Wuhan University)

  • Zhenxing Hu

    (The University of Texas at Dallas)

  • Tingge Xu

    (The University of Texas at Dallas)

  • Hongbing Lu

    (The University of Texas at Dallas)

  • Zhiping Xu

    (Tsinghua University)

  • Chun Li

    (Tsinghua University)

Abstract

Graphene-derived macroscopic assemblies feature hierarchical nano- and microstructures that provide numerous routes for surface and interfacial functionalization achieving unconventional material properties. We report that the microstructural hierarchy of pristine chemically modified graphene films, featuring wrinkles, delamination of close-packed laminates, their ordered and disordered stacks, renders remarkable negative Poisson’s ratios ranging from −0.25 to −0.55. The mechanism proposed is validated by the experimental characterization and theoretical analysis. Based on the understanding of microstructural origins, pre-strech is applied to endow chemically modified graphene films with controlled negative Poisson’s ratios. Modulating the wavy textures of the inter-connected network of close-packed laminates in the chemically modified graphene films also yields finely-tuned negative Poisson’s ratios. These findings offer the key insights into rational design of films constructed from two-dimensional materials with negative Poisson’s ratios and mechanomutable performance.

Suggested Citation

  • Yeye Wen & Enlai Gao & Zhenxing Hu & Tingge Xu & Hongbing Lu & Zhiping Xu & Chun Li, 2019. "Chemically modified graphene films with tunable negative Poisson’s ratios," Nature Communications, Nature, vol. 10(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-10361-3
    DOI: 10.1038/s41467-019-10361-3
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