This title appears in the Scientific Report :
2022
Please use the identifier:
http://dx.doi.org/10.1021/acsaelm.1c00854 in citations.
Please use the identifier: http://hdl.handle.net/2128/30654 in citations.
Origins of Leakage Currents on Electrolyte-Gated Graphene Field-Effect Transistors
Origins of Leakage Currents on Electrolyte-Gated Graphene Field-Effect Transistors
Graphene 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,...
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Personal Name(s): | Svetlova, Anastasia (Corresponding author) |
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Kireev, Dmitry / Beltramo, Guillermo / Mayer, Dirk / Offenhäusser, Andreas | |
Contributing Institute: |
Bioelektronik; IBI-3 Mechanobiologie; IBI-2 |
Published in: | ACS applied electronic materials, 3 (2021) 12, S. 5355 - 5364 |
Imprint: |
Washington, DC
ACS Publications
2021
|
DOI: |
10.1021/acsaelm.1c00854 |
Document Type: |
Journal Article |
Research Program: |
Information Processing in Neuronal Networks |
Link: |
OpenAccess Restricted |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/30654 in citations.
Graphene 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. |