• PRL-123-116105-

Topology of Disordered 3D Graphene Networks

Authors: Jacob W. Martin, Carla de Tomas, Irene Suarez-Martinez, Markus Kraft*, and Nigel Marks

Reference: Physical Review Letters 123, 116105, (2019)

  • Self-assembled carbon networks representing the most experimentally accurate and large models for disordered carbon materials were analysed.
  • A new mesh-based analysis showed that the global curvature was saddle-like.
  • Layering arose from density driven screw dislocations and a variety of non-graphenelike defects.

Graphical abstract Disordered carbons comprise graphene fragments assembled into three-dimensional networks. It has long been debated whether these networks contain positive curvature, as seen in fullerenes, negative curvature, as proposed for the schwarzite structures, or zero curvature, as in ribbons. We present a mesh-based approach to analyze the topology of a set of nanoporous and glassy carbon models that accurately reproduce experimental properties. Although all three topological elements are present, negatively curved structures dominate. At the atomic level, analysis of local environments shows that sp- and sp3-bonded atoms are associated with line defects and screw dislocations that resolve topological complexities such as termination of free edges and stacking of low curvature regions into ribbons. These results provide insight into the synthesis of porous carbon materials, glassy carbon and the graphitizability of carbon materials

Access options

Associated Themes:
  Theme icon

*Corresponding author:
Telephone: +44 (0)1223 762784 (Dept) 769010 (CHU)
Address: Department of Chemical Engineering and Biotechnology
University of Cambridge
West Cambridge Site
Philippa Fawcett Drive
Cambridge CB3 0AS
United Kingdom
Website: Personal Homepage