187 Scopus citations


We have studied the electron transport behavior of electrochemically gated graphene transistors in different solutions. In an ionic liquid, we have determined the electron and hole carrier densities and estimated the concentration of charged impurities to be (1-10) × 1012 cm -2. The minimum conductivity displays an exponential decrease with the density of charged impurities, which is attributed to the impurity scattering of the carriers. In aqueous solutions, the position of minimum conductivity shifts negatively as the ionic concentration increases. The dependence of the transport properties on ionic concentration is important for biosensor applications, and the observation is modeled in terms of screening for impurity charges by the ions in solutions.

Original languageEnglish (US)
Pages (from-to)9908-9909
Number of pages2
JournalJournal of the American Chemical Society
Issue number29
StatePublished - Jul 29 2009

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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