Solution-gated Epitaxial Graphene As PH Sensor

Overview

Journal J Am Chem Soc

Publisher American Chemical Society

Specialty Chemistry

Date 2008 Oct 15

PMID 18850701

Citations 51

Authors

Priscilla Kailian Ang

Wei Chen

Andrew Thye Shen Wee

Kian Ping Loh

Affiliations

Soon will be listed here.

Abstract

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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