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The strength of mechanically-exfoliated monolayer graphene deformed on a rigid polymer substrate

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  • المؤلفون: Zhao, Xin; Papageorgiou, Dimitrios G; Zhu, Liyan; Ding, Feng; Young, Robert J
  • المصدر:
    Zhao , X , Papageorgiou , D G , Zhu , L , Ding , F & Young , R J 2019 , ' The strength of mechanically-exfoliated monolayer graphene deformed on a rigid polymer substrate ' , Nanoscale . https://doi.org/10.1039/c9nr04720d
  • نوع التسجيلة:
    article in journal/newspaper
  • اللغة:
    English
  • معلومة اضافية
    • الموضوع:
      2019
    • Collection:
      The University of Manchester: Research Explorer - Publications
    • نبذة مختصرة :
      The deformation and fracture behaviour of one-atom-thick mechanically exfoliated graphene has been studied in detail. Monolayer graphene flakes with different lengths, widths and shapes were successfully prepared by mechanical exfoliation and deposited onto poly(methyl methacrylate) (PMMA) beams. The fracture behaviour of the monolayer graphene was followed by deforming the PMMA beams. Through in situ Raman mapping at different strain levels, the distributions of strain over the graphene flakes were determined from the shift of the graphene Raman 2D band. The failure mechanisms of the exfoliated graphene were either by flake fracture or failure of the graphene/polymer interface. The fracture of the flakes was observed from the formation of cracks identified from the appearance of lines of zero strain in the strain contour maps. It was found that the strength of the monolayer graphene flakes decreased with increasing flake width. The strength dropped to less than ∼10 GPa for large flakes, thought to be due to the presence of defects. It is shown that a pair of topological defects in monolayer graphene will form a pseudo crack and the effect of such defects upon the strength of monolayer graphene has been modelled using molecular mechanical simulations.
    • File Description:
      application/pdf
    • الرقم المعرف:
      10.1039/c9nr04720d
    • الدخول الالكتروني :
      https://research.manchester.ac.uk/en/publications/01b3a862-1a73-4caa-869b-e5a1714a257b
      https://doi.org/10.1039/c9nr04720d
      https://pure.manchester.ac.uk/ws/files/118947545/Revision_No_Highlights.pdf
    • Rights:
      info:eu-repo/semantics/openAccess
    • الرقم المعرف:
      edsbas.D06BDDF