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Keywords:

  • graphene;
  • ionic liquid;
  • floating bridge;
  • suspended structure

Abstract

Floating-bridge structures of graphene with ionic-liquid gate have been fabricated. After removing the SiO2 layer under the graphene channel and introduction of ionic liquid, the ionic liquid under the suspended-graphene channel contacts with an exposed back-gate electrode, resulting in formation of the floating-bridge structures. Owing to elimination of the interaction with SiO2 layers and the electrical double layer in the ionic liquid, the floating-bridge bilayer graphene devices have the on/off ratio of 20 in a conductance when the back-gate voltage of only 2 V was applied. The floating-bridge structures of graphene on the ionic liquid operate with high performance by small gate voltage. (© 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)