Journal
NANO LETTERS
Volume 9, Issue 12, Pages 4031-4036Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl902200b
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Funding
- National Science Foundation [DMR-0520513, EEC-0647560, DMR-0706067]
- Office of Naval Research [N00014-09-1-0180, N00014-09-1-0795]
- Nanoelectronics Research Initiative
- Natural Sciences and Engineering Research Council of Canada
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
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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.
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