Direction-sensitive graphene flow sensor

Graphene flow sensors not only hold great prospects for applications but also encounter many difficulties, such as unwanted electrochemical phenomena, low measurable signal, and limited dependence on the flow direction. This study proposes an approach allowing for the detection of a flow direction-d...

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Bibliographic Details
Published in:Applied physics letters 2023-12, Vol.123 (26)
Main Authors: Kaźmierczak, P., Binder, J., Boryczko, K., Ciuk, T., Strupiński, W., Stępniewski, R., Wysmołek, A.
Format: Article
Language:English
Subjects:
Applied physics
Aqueous solutions
Electrodes
Graphene
Induced voltage
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Summary:Graphene flow sensors not only hold great prospects for applications but also encounter many difficulties, such as unwanted electrochemical phenomena, low measurable signal, and limited dependence on the flow direction. This study proposes an approach allowing for the detection of a flow direction-dependent electric signal in aqueous solutions of salts, acids, and bases. The key element in the proposed solution is the use of a reference electrode which allows external gating of the graphene structure. Using external gating enables to enhance substantially the amplitude of the flow-generated signal. Simultaneous measurement of the reference electrode current allows us to recover a flow-direction-sensitive component of the flow-induced voltage in graphene. The obtained results are discussed in terms of the Coulomb interaction and other phenomena, which can be present at the interface of graphene with the aqueous solution.
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0171880