Electrochemical Gate-Controlled Charge Transport in Graphene in Ionic Liquid and Aqueous Solution

Citations Over TimeTop 10% of 2009 papers

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) x 10(12) 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.

Related Papers

• → Large ionic clusters in concentrated aqueous NaCl solution(1999)77 cited
• → Ionic liquid-functionalized graphene as modifier for electrochemical and electrocatalytic improvement: Comparison of different carbon electrodes(2011)46 cited
• → Ionic conductivity of Li+ ion conductors, Li4.2MxSi1$minus;xO4 (M: B3+, Al3+, Ga3+, Cr3+, Fe3+, Co2+, Ni2+)(1990)24 cited
• → Electrochemical Investigation of Quaternary Ammonium/Aluminum Chloride Ionic Liquids(2004)24 cited
• → Spectrophotometric studies on thiocyanatocuprate(II) complexes in aqueous solution(1959)14 cited