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Crumpling Defective Graphene Sheets.

Yangchao Liao1, Zhaofan Li1, Long Chen1

  • 1Department of Civil, Construction and Environmental Engineering, North Dakota State University, Fargo, North Dakota 58108, United States.

Nano Letters
|March 10, 2023
PubMed
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Stone-Wales defects in graphene sheets significantly alter crumpling behavior, weakening self-adhesion and increasing structural heterogeneity. This defect engineering offers new pathways for designing advanced crumpled graphene structures.

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Graphene sheets exhibit unique hierarchical structures upon crumpling, showing high resistance to compression and aggregation.
  • These crumpled structures have garnered significant attention for diverse applications due to their mechanical properties.

Purpose of the Study:

  • To investigate the fundamental impact of Stone-Wales (SW) defects on the crumpling behavior of graphene sheets.
  • To understand how topological defects influence the structural and mechanical properties of crumpled graphene.

Main Methods:

  • Atomically informed coarse-grained molecular dynamics (CG-MD) simulations were employed.
  • Analysis focused on sheet conformation, size scaling laws, self-adhesion, local curvatures, stresses, and cross-section patterns.
Keywords:
Stone−Wales defectcoarse-grained modelingcrumpled graphenemechanical statemolecular dynamics simulationsstructural behavior

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Main Results:

  • SW defects were found to strongly influence graphene sheet conformation, altering size scaling laws.
  • The presence of SW defects weakens the self-adhesion of graphene sheets during crumpling.
  • Internal structural analyses revealed enhanced mechanical heterogeneity and a "glass-like" amorphous state in defect-containing crumpled graphene.

Conclusions:

  • SW defects play a crucial role in modifying the crumpling behavior and resulting structures of graphene.
  • Defect engineering presents a viable strategy for tailoring the properties of crumpled graphene materials.
  • Findings provide fundamental insights for designing advanced materials with controlled hierarchical structures.