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J Am Chem Soc. 2008 Nov 5;130(44):14392-3. doi: 10.1021/ja805090z. Epub 2008 Oct 14.

Solution-gated epitaxial graphene as pH sensor.

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  • 1Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543, Singapore.


A solution-gate field effect transistor (SGFET) has been fabricated on few-layer graphene (FLG). The ideally polarizable graphene/aqueous electrolyte interface allows the capacitive charging of the surface by hydroxyl (OH-) and hydroxonium ions (H3O+). The conductivity versus gate potential curve exhibits "V" shaped ambipolar transfer characteristics of graphene, with hole and electron mobilities of 3600 cm2/Vs and 2100 cm2/Vs, respectively. The shift of the negative gate potential with pH shows a supra-Nernstian response of 99 meV/pH. Our work points to the potential application of graphene in ultrafast and ultralow noise chemical or biological sensors.

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