4.8 Article

Graphene Nanoribbons with Atomically Sharp Edges Produced by AFM Induced Self-Folding

Journal

SMALL
Volume 14, Issue 47, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201803386

Keywords

AFM; atomically sharp edge; graphene nanoribbon; graphene origami; self-folding

Funding

  1. National Research Foundation (NRF) of Korea - Korea Government [2014R1A1A2056555, 2017R1D1B04036381]
  2. Center for Women in Science, Engineering and Technology (WISET) - Ministry of Science, ICT AMP
  3. Future Planning of Korea (MSIP) [2017-648]
  4. Samsung Science and Technology Foundation [SSTF-BA1401-08]
  5. Welch Foundation [F-1662]
  6. College of Natural Science at UT-Austin

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The ability to create graphene nanoribbons with atomically sharp edges is important for various graphene applications because these edges significantly influence the overall electronic properties and support unique magnetic edge states. The discovery of graphene self-folding induced by traveling wave excitation through atomic force microscope scanning under a normal force of less than 15 nN is reported. Most remarkably, the crystallographic direction of self-folding may be either along a chosen direction defined by the scan line or along the zigzag or armchair direction in the presence of a pre-existing crack in the vicinity. The crystalline direction of the atomically sharp edge is confirmed via careful lateral force microscopy measurements. Multilayer nanoribbons with lateral dimensions of a few tens of nanometers are realized on the same graphene sheet with different folding types (e.g., z-type or double parallel). Molecular dynamics simulations reveal the folding dynamics and suggest a monotonic increase of the folded area with the applied normal force. This method may be extended to other 2D van der Waals materials and lead to nanostructures that exhibit novel edge properties without the chemical instability that typically hinders applications of etched or patterned graphene nanostructures.

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