Degree of functionalisation dependence of individual Raman intensities in covalent graphene derivatives
Vecera P, Eigler S, Kolesnik-Gray M, Krstic V, Vierck A, Maultzsch J, Schafer R, Hauke F, Hirsch A (2017)
Publication Status: Published
Publication Type: Journal article
Publication year: 2017
Journal
Publisher: NATURE PUBLISHING GROUP
Book Volume: 7
DOI: 10.1038/srep45165
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 p-conjugated domains surrounded by sp3 carbon regions in graphene monolayers. The findings are further underpinned by a model which correlates the individual Raman mode intensities to the degree of functionalisation. We also show that the position shift in the spectra of solvent-based and powdered functionalised graphene derivatives originates predominantly from the presence of edge-to-edge and edge-to-basal plane interactions and is by large functionalisation independent.
Authors with CRIS profile
Philipp Vecera
Lehrstuhl für Organische Chemie II
Siegfried Eigler
Lehrstuhl für Organische Chemie II
Maria Kolesnik-Gray
Chair of Applied Physics (LAP)
Vojislav Krstic
Professur für Angewandte Physik
Janina Maultzsch
Lehrstuhl für Experimentalphysik
Frank Hauke
Zentralinstitut für Neue Materialien und Prozesstechnik
Andreas Hirsch
Lehrstuhl für Organische Chemie II
Involved external institutions
Germany (DE)How to cite
APA:
Vecera, P., Eigler, S., Kolesnik-Gray, M., Krstic, V., Vierck, A., Maultzsch, J.,... Hirsch, A. (2017). Degree of functionalisation dependence of individual Raman intensities in covalent graphene derivatives. Scientific Reports, 7. https://doi.org/10.1038/srep45165
MLA:
Vecera, Philipp, et al. "Degree of functionalisation dependence of individual Raman intensities in covalent graphene derivatives." Scientific Reports 7 (2017).
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