Dirac cone filling dynamics due to field effect at graphene electrochemical interfaces
Butko A. V.1, Butko V. Y.1, Kumzerov Y. A. 1
1Ioffe Institute, St. Petersburg, Russia
Email: vladimirybutko@gmail.com
Dynamics of charge accumulation at electrochemical graphene interfaces is important for capacitor, battery, and sensor applications. These dynamics depend on quantum capacitance and filling time (tau) of the Dirac cone in graphene when the field effect is present at these interfaces. By analyzing the impedance-spectroscopy literature data on the graphene electrochemical interfaces with water and sulfuric acid aqueous solution, we have revealed that in these cases tau is 0.4 and 0.022 s, respectively. These values are consistent with the hypothesis that at these interfaces tau is determined by the reconstruction time of molecules (polarized for water and charged for acidic solutions); hence, measurement of tau is promising for the molecular sensor fabrication. Keywords: quantum capacitance, graphene, interface, molecular bonding, relaxation time.
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