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000906136 1001_ $$0P:(DE-Juel1)171954$$aSvetlova, Anastasia$$b0$$eCorresponding author
000906136 245__ $$aOrigins of Leakage Currents on Electrolyte-Gated Graphene Field-Effect Transistors
000906136 260__ $$aWashington, DC$$bACS Publications$$c2021
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000906136 520__ $$aGraphene field-effect transistors are widely used for development of biosensors. However, certain fundamental questions about details of their functioning have not been fully understood yet. One of these questions is the presence of gate/leakage currents in the electrolyte-gated configuration. Here, we report our observations and causes of this phenomenon on chemical vapor deposition (CVD)-grown graphene. We observed transistor’s gate currents occurring at the surface of graphene exposed to the electrolyte. Gate currents are capacitive when the graphene channel is doped by holes and Faradic when it is doped by electrons in field-effect measurements. We prove that Faradic currents are attributed to the reduction of oxygen dissolved in the aqueous solution and their magnitude increases with each measurement. We employed cyclic voltammetry with a redox probe Fc(MeOH)2 to characterize changes in the graphene structure that are responsible for this activation. Collectively, our results reveal that through the course of catalytic oxygen reduction on the transistor’s surface, its electroactivity toward an out-of-plane heterogeneous electron transfer increases.
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000906136 7001_ $$0P:(DE-Juel1)159559$$aKireev, Dmitry$$b1
000906136 7001_ $$0P:(DE-Juel1)128800$$aBeltramo, Guillermo$$b2$$ufzj
000906136 7001_ $$0P:(DE-Juel1)128707$$aMayer, Dirk$$b3
000906136 7001_ $$0P:(DE-Juel1)128713$$aOffenhäusser, Andreas$$b4
000906136 773__ $$0PERI:(DE-600)2949097-2$$a10.1021/acsaelm.1c00854$$gVol. 3, no. 12, p. 5355 - 5364$$n12$$p5355 - 5364$$tACS applied electronic materials$$v3$$x2637-6113$$y2021
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000906136 9141_ $$y2022
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