Stable aqueous dispersions of noncovalently functionalized graphene from graphite and their multifunctional high-performance applications

Nano Lett. 2010 Nov 10;10(11):4295-301. doi: 10.1021/nl903557p. Epub 2010 Jun 17.

Abstract

We present a scalable and facile technique for noncovalent functionalization of graphene with 1-pyrenecarboxylic acid that exfoliates single-, few-, and multilayered graphene flakes into stable aqueous dispersions. The exfoliation mechanism is established using stringent control experiments and detailed characterization steps. Using the exfoliated graphene, we demonstrate highly sensitive and selective conductometric sensors (whose resistance rapidly changes >10,000% in saturated ethanol vapor), and ultracapacitors with extremely high specific capacitance (∼ 120 F/g), power density (∼ 105 kW/kg), and energy density (∼ 9.2 Wh/kg).

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Colloids / chemistry*
  • Crystallization / methods*
  • Graphite / chemistry*
  • Macromolecular Substances / chemistry
  • Materials Testing
  • Molecular Conformation
  • Nanostructures / chemistry*
  • Nanostructures / ultrastructure*
  • Nanotechnology / methods
  • Particle Size
  • Surface Properties
  • Water / chemistry*

Substances

  • Colloids
  • Macromolecular Substances
  • Water
  • Graphite