Biochemical Sensing in Solution Gated Graphene Field Effect Transistors

ORAL

Abstract

Epitaxial graphene is a promising material for the construction of label-free chemical and biochemical sensors. In this work, graphene of few-layers is used as a sensor for pH and ionic strength in a solution gated field effect transistor (SGFET). In order to improve the sensitivity of the SGFET to pH and ionic changes the transistor is connected in a four-point (van der Pauw) configuration. Results for the shift in the Dirac point when the pH or ionic strength is changed are shown.

*This work is supported by the National Science Foundation under Grant No. DMR-0820382

–

Authors

  • Mauricio D. Bedoya

    • School of Physics and Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology Atlanta, GA 30332 (USA)

  • Jan Scrimgeour

    • School of Physics and Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology Atlanta, GA 30332 (USA)

  • James Palmer

    • School of Physics, Georgia Institute of Technology Atlanta, GA 30332 (USA)

  • W.A. deHeer

    • School of Physics, Georgia Institute of Technology Atlanta, GA 30332 (USA)

  • C. Berger

    • School of Physics, Georgia Institute of Technology Atlanta, GA 30332 (USA) and CNRS-Institut Neel, BP 166, 38042 Grenoble, Cedex 9, France

  • J.E. Curtis

    • School of Physics and Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology Atlanta, GA 30332 (USA)