Abstract

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
Volume131
Issue number29
DOIs
StatePublished - Jul 29 2009

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Ionic Liquids
Graphite
Ionic liquids
Graphene
Charge transfer
Impurities
Biosensing Techniques
Electron Transport
Observation
Biosensors
Electrons
Transport properties
Ions
Carrier concentration
Screening
Scattering

ASJC Scopus subject areas

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

Cite this

Electrochemical gate-controlled charge transport in graphene in ionic liquid and aqueous solution. / Chen, Fang; Qing, Quan; Xia, Jilin; Li, Jinghong; Tao, Nongjian.

In: Journal of the American Chemical Society, Vol. 131, No. 29, 29.07.2009, p. 9908-9909.

Research output: Contribution to journalArticle

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AU - Li, Jinghong

AU - Tao, Nongjian

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N2 - 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.

AB - 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.

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