Doping of bi-layer graphene by gradually polarizing a ferroelectric polymer

The influence of the gradual polarization of a ferroelectric polymer on isotopically labeled bi-layer graphene has been investigated by Raman spectroscopy. The Raman frequencies of the C-13 graphene modes are downshifted with respect to the Raman frequencies of C-12 graphene, which enabled us to study the individual layer components of bi-layer graphene. The polarization of the ferroelectric polymer has a similar influence on the electron and hole concentration at the C-13 graphene and the C-12 graphene layer despite the C-13 graphene layer being only in direct contact with the ferroelectric polymer. In the Raman experiment the doping of graphene was confirmed by a similar frequency shift of the G modes and similar changes in the intensities of the G modes during the electrochemical charging of the ferroelectric polymer. (C) 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim