Spontaneous high-concentration dispersions and liquid crystals of graphene

Natnael Behabtu, Jay R. Lomeda, Micah J. Green, Amanda L. Higginbotham, Alexander Sinitskii, Dmitry V. Kosynkin, Dmitri Tsentalovich, A. Nicholas G. Parra-Vasquez, Judith Schmidt, Ellina Kesselman, Yachin Cohen, Yeshayahu Talmon, James M. Tour, Matteo Pasquali

Research output: Contribution to journalArticle

433 Scopus citations


Graphene combines unique electronic properties and surprising quantum effects with outstanding thermal and mechanical properties. Many potential applications, including electronics and nanocomposites, require that graphene be dispersed and processed in a fluid phase. Here, we show that graphite spontaneously exfoliates into single-layer graphene in chlorosulphonic acid, and dissolves at isotropic concentrations as high as ∼2 mgml-1, which is an order of magnitude higher than previously reported values. This occurs without the need for covalent functionalization, surfactant stabilization, or sonication, which can compromise the properties of graphene or reduce flake size. We also report spontaneous formation of liquid-crystalline phases at high concentrations (∼20-30mgml-1). Transparent, conducting films are produced from these dispersions at 1,000ω -1 and ∼ 80% transparency. High-concentration solutions, both isotropic and liquid crystalline, could be particularly useful for making flexible electronics as well as multifunctional fibres.

Original languageEnglish (US)
Pages (from-to)406-411
Number of pages6
JournalNature Nanotechnology
Issue number6
StatePublished - Jun 2010


ASJC Scopus subject areas

  • Bioengineering
  • Atomic and Molecular Physics, and Optics
  • Biomedical Engineering
  • Materials Science(all)
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

Behabtu, N., Lomeda, J. R., Green, M. J., Higginbotham, A. L., Sinitskii, A., Kosynkin, D. V., Tsentalovich, D., Parra-Vasquez, A. N. G., Schmidt, J., Kesselman, E., Cohen, Y., Talmon, Y., Tour, J. M., & Pasquali, M. (2010). Spontaneous high-concentration dispersions and liquid crystals of graphene. Nature Nanotechnology, 5(6), 406-411. https://doi.org/10.1038/nnano.2010.86