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Two- and Three-Dimensional Self-Folding of Free-Standing Graphene by Liquid Evaporation


Two-dimensional (2-D) atomically thin graphene has exhibited overwhelming excellent properties over bulk counterpart quantity graphite, yet their broad applications and explorations of unprecedented properties require the diversity of their geometric morphologies, beyond their inherently planar structures. In this study, we present a self-folding approach of converting 2-D planar free-standing graphene to 2-D and 3-D folded structures through the evaporation of its liquid solutions. This approach involves the competition of surface energy of liquid, and deformation energy and van der Waals energy of graphene. An energy-based theoretical model is developed to describe the self-folding process during liquid evaporation by incorporating both graphene dimensions and surface wettability. The critical elastocapillary length by liquid evaporation is extracted and exemplified by investigating three typical graphene geometries with rectangular, circular and triangular shapes. After the complete evaporation of liquid, the critical self-folding length of graphene to a stable folded pattern by van der Waals energy is also obtained. In parallel, full-scale molecular dynamics (MD) simulations are performed to monitor the evolution of deformation energies and folded patterns with liquid evaporation. The simulation results demonstrate the formation of 2-D folded racket-like and 3-D folded cone-like patterns and show remarkable agreement with theoretical predictions in both energy variations and folded patterns. This work offers a quantitative guidance for controlling the self-folding of graphene and other 2-D materials into complex structures by liquid evaporation.

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Publication details

The article was received on 28 Apr 2018, accepted on 16 May 2018 and first published on 16 May 2018

Article type: Paper
DOI: 10.1039/C8SM00873F
Citation: Soft Matter, 2018, Accepted Manuscript
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    Two- and Three-Dimensional Self-Folding of Free-Standing Graphene by Liquid Evaporation

    Q. Liu and B. Xu, Soft Matter, 2018, Accepted Manuscript , DOI: 10.1039/C8SM00873F

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