Graphene transistor as a probe for streaming potential.
Graphene transistor as a probe for streaming potential.
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DOI:
10.1021/nl300603v
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发表时间:
2012-06-13
期刊:
影响因子:
10.8
通讯作者:
Bolotin KI
中科院分区:
文献类型:
--
作者:
Newaz AK;Markov DA;Prasai D;Bolotin KI
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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