期刊
NANO LETTERS
卷 12, 期 6, 页码 2931-2935出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl300603v
关键词
Graphene; streaming potential; electric double layer; flow sensor; ionic strength sensor; microfluidics
类别
资金
- NSF CAREER [DMR-1056859]
- NSF EPS [1004083]
- NIH [R21CA126728-01A1]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1056859] Funding Source: National Science Foundation
- Office Of The Director
- EPSCoR [1004083] Funding Source: National Science Foundation
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 similar to 70 nL/min and detect a change in the ionic concentration as small as similar to 40 nM.
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