Solution phase production of graphene with controlled thickness via density differentiation

Alexander A. Green, Mark C Hersam

Research output: Contribution to journalArticle

558 Citations (Scopus)

Abstract

Graphene flakes with controlled thicknesses are isolated in solution using density gradient ultracentrifugation. These stable graphene dispersions are produced using the bile salt sodium cholate, which promotes graphite exfoliation and results in graphene-surfactant complexes having buoyant densities that vary with graphene thickness. The sorted graphene flakes are characterized using atomic force microscopy and Raman spectroscopy. Graphene dispersions produced using density differentiation offer superior performance in transparent conductors than those produced using conventional sedimentation-based centrifugation techniques.

Original languageEnglish
Pages (from-to)4031-4036
Number of pages6
JournalNano Letters
Volume9
Issue number12
DOIs
Publication statusPublished - Dec 9 2009

Fingerprint

Graphite
Graphene
graphene
flakes
Dispersions
Sodium Cholate
Centrifugation
Sedimentation
Raman spectroscopy
Bile Acids and Salts
Atomic force microscopy
Surface-Active Agents
Surface active agents
conductors
graphite
surfactants
Sodium
sodium
atomic force microscopy
Salts

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanical Engineering

Cite this

Solution phase production of graphene with controlled thickness via density differentiation. / Green, Alexander A.; Hersam, Mark C.

In: Nano Letters, Vol. 9, No. 12, 09.12.2009, p. 4031-4036.

Research output: Contribution to journalArticle

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