Mechanical properties of graphene cantilever from atomic force microscopy and density functional theory

Rasuli, R. (Reza) ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1088/0957-4484/21/18/185503
  3. Abstract:
  4. We have studied the mechanical properties of a few-layer graphene cantilever (FLGC) using atomic force microscopy (AFM). The mechanical properties of the suspended FLGC over an open hole have been derived from the AFM data. Force displacement curves using the Derjaguin–Müller–Toporov (DMT) and the massless cantilever beam models yield a Young modulus of Ec ~ 37, Ea ~ 0.7 TPa and a Hamakar constant of ~ 3 × 10 − 18 J. The threshold force to shear the FLGC was determined from a breaking force and modeling. In addition, we studied a graphene nanoribbon (GNR), which is a system similar to the FLGC; using density functional theory (DFT). The in-plane Young's modulus for the GNRs were calculated from the DFT outcomes ~ 0.82 TPa and the results were compared with the experiment. We found that the Young's modulus and the threshold shearing force are dependent on the direction of applied force and the values are different for zigzag edge and armchair edge GNRs
  5. Keywords:
  6. AFM ; Applied forces ; Breaking force ; Force-displacement curves ; Graphene nano-ribbon ; In-plane ; Open holes ; Shearing force ; Threshold force ; Young modulus ; Young's Modulus ; Zigzag edges
  7. Source: Nanotechnology ; Volume 21, Issue 18, Article number 185503 , 2010 ; 09574484
  8. URL: http://iopscience.iop.org/0957-4484/21/18/185503