Journal of the Korean Physical Society

pISSN 0374-4884 eISSN 1976-8524
Qrcode

Article

J. Korean Phy. Soc. 2019; 74(2): 132-135

Published online January 31, 2019     https://doi.org/10.3938/jkps.74.132

Copyright © The Korean Physical Society.

Electrochemical Doping of Graphene with H2SO4 Electrolyte

Young-Jun Yu

Department of Physics, Chungnam National University, Daejeon 34134, Korea

Correspondence to:Young-Jun Yu

Abstract

In this work, the doping variations of graphene when a gate voltage is applied using H2SO4 as an electrolyte are investigated. In particular, the natural and the artificial release behaviors of the accumulated carrier density in graphene by electrolyte gating were observed. Furthermore, this doping condition of graphene is not permanent, as it returns to the initial doping-condition after several tens of hours. On the other hand, the direct electron and hole doping of graphene by means of an electrolyte gating avenue is demonstrated. These results represent significant findings pertaining to the conductivity tuning of graphene electrodes, which can be utilized to create flexible and transparent electrodes.

Keywords: Graphene, Electrolyte, Carrier density, Doping