Degree of functionalisation dependence of individual Raman intensities in covalent graphene derivatives.

ABSTRACT: Covalent functionalisation of graphene is a continuously progressing field of research. The optical properties of such derivatives attract particular attention. In virtually all optical responses, however, an enhancement in peak intensity with increase of sp³ carbon content, and a vanishing of the peak position shift in monolayer compared to few-layer systems, is observed. The understanding of these seemingly connected phenomena is lacking. Here we demonstrate, using Raman spectroscopy and in situ electrostatic doping techniques, that the intensity is directly modulated by an additional contribution from photoluminescent π-conjugated domains surrounded by sp³ carbon regions in graphene monolayers. The findings are further underpinned by a model which correlates the in

SUBMITTER: Vecera P 

PROVIDER: S-EPMC5366877 | biostudies-literature | 2017 Mar

REPOSITORIES: biostudies-literature