The electrical properties of graphene are known to be modified by chemical species that interact with it. We investigate the effect of doping of graphene-based devices by toluene (C6H5CH3). We show that this effect has a complicated character. Toluene is seen to act as a donor, transferring electrons to the graphene. However, the degree of doping is seen to depend on the magnitude and polarity of an electric field applied between the graphene and a nearby electrode. This can be understood in terms of an electrochemical reaction mediated by the graphene crystal.
@article{arxiv.1010.4763,
title = {Electrochemical doping of graphene},
author = {A. A. Kaverzin and S. M. Strawbridge and A. S. Price and F. Withers and A. K. Savchenko and D. W. Horsell},
journal= {arXiv preprint arXiv:1010.4763},
year = {2010}
}