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Network Covalent Solids02:18

Network Covalent Solids

Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...

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Graphene to graphane: a theoretical study.

M Z S Flores1, P A S Autreto, S B Legoas

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Hydrogen frustration in graphane (a 2D carbon material) leads to structural defects, causing membrane shrinkage and corrugations. Perfect graphane structures are unlikely due to these unavoidable H-frustrated domains.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Graphane, a hydrogenated graphene derivative, is a 2D material with sp(3) hybridized carbon atoms.
  • Ideal graphane features an alternating up-and-down pattern of C-H bonds.
  • Deviations from this ideal pattern, known as H frustration, can significantly alter material properties.

Purpose of the Study:

  • To investigate the impact of H frustration on graphane-like structures.
  • To understand the formation and characteristics of H-frustrated domains during hydrogenation.
  • To determine the feasibility of forming large, perfect graphane domains.

Main Methods:

  • Ab initio simulations
  • Reactive molecular dynamics simulations

Main Results:

  • Significant percentages of uncorrelated H-frustrated domains form early in the hydrogenation process.
  • These domains induce membrane shrinkage and extensive corrugations in graphane structures.
  • H-frustrated domains appear to be an inherent feature, hindering the formation of perfect graphane.

Conclusions:

  • H frustration plays a critical role in the structural integrity of graphane-like materials.
  • The presence of H-frustrated domains limits the possibility of achieving large-scale, defect-free graphane.
  • Understanding H frustration is crucial for designing and synthesizing stable graphane-based materials.