Graphene transistor as a probe for streaming potential.

Nano Letters
A K M NewazK I Bolotin

Abstract

We explore the dependence of electrical transport in a graphene field effect transistor (GraFET) on the flow of water/sodium chloride electrolyte within the immediate vicinity of that transistor. We find large and reproducible shifts in the charge neutrality point of GraFETs that are dependent on the liquid velocity and the ion concentration. We show that these shifts are consistent with the variation of the local electrochemical potential of the liquid next to graphene that are caused by the fluid flow (streaming potential). Furthermore, we utilize the sensitivity of electrical transport in GraFETs to the parameters of the fluid flow to demonstrate graphene-based mass flow and ionic concentration sensing. We successfully detect a flow as small as ∼70 nL/min and detect a change in the ionic concentration as small as ∼40 nM.

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Citations

Aug 1, 2013·Nano Letters·Ying ChenJ Iwan D Alexander
Apr 8, 2014·Nature Nanotechnology·Jun YinWanlin Guo
Jul 29, 2016·Scientific Reports·Sing-Jyun Tsai, Ruey-Jen Yang
Sep 4, 2015·Nanoscale·B H SonY H Ahn
Jan 10, 2018·Chemistry : a European Journal·Yifan XuHuisheng Peng
Dec 14, 2018·Nature Nanotechnology·Zhuhua ZhangWanlin Guo
Feb 26, 2019·Royal Society Open Science·G R BarretoI L Nantes-Cardoso
Sep 11, 2013·Advanced Materials·Chuancheng JiaXuefeng Guo
Aug 21, 2013·Advanced Healthcare Materials·Feng YanJinhua Li
Jan 13, 2021·Journal of Agricultural and Food Chemistry·Yuhong WangLei Zheng
Mar 21, 2021·Nature Communications·Xiaoyu ZhangJinglei Ping
Oct 15, 2021·Nanoscale·Jianing DongZhong-Qun Tian

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