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Network Covalent Solids02:18

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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.
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Graphene solutions.

Amélie Catheline1, Cristina Vallés, Carlos Drummond

  • 1Université de Bordeaux, Centre de Recherche Paul Pascal-CNRS, 115 av. Schweitzer, 33600, Pessac, France.

Chemical Communications (Cambridge, England)
|April 13, 2011
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Summary

Thermodynamics enable the dissolution of graphite intercalation compound KC(8) in NMP, forming stable graphene solutions. Researchers measured the reduction potential of graphene and identified single-layer graphene flakes using electron diffraction.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Physical Chemistry

Background:

  • Graphite intercalation compounds (GICs) offer unique properties.
  • Understanding GIC dissolution is crucial for material processing.
  • N-Methyl-2-pyrrolidone (NMP) is a common solvent.

Purpose of the Study:

  • To investigate the spontaneous dissolution of KC(8) in NMP.
  • To determine the reduction potential of graphene.
  • To characterize the resulting graphene flakes.

Main Methods:

  • Thermodynamic analysis of KC(8) dissolution.
  • Electrochemical measurements to determine reduction potential.
  • Electron diffraction for graphene flake identification.

Main Results:

  • KC(8) spontaneously dissolves in NMP, forming stable solutions.
  • The reduction potential of graphene was measured at +22 mV vs. SCE.
  • Single-layer graphene flakes (approx. 1 μm²) were confirmed by electron diffraction.

Conclusions:

  • Thermodynamics favor the dissolution of KC(8) in NMP.
  • The electrochemical and structural properties of graphene derived from KC(8) are characterized.
  • This work provides insights into graphene solution processing.