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

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Details zur Publikation

Autor(en): Vecera P, Eigler S, Kolesnik-Gray M, Krstic V, Vierck A, Maultzsch J, Schafer R, Hauke F, Hirsch A
Zeitschrift: Scientific Reports
Verlag: NATURE PUBLISHING GROUP
Jahr der Veröffentlichung: 2017
Band: 7
ISSN: 2045-2322


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.



FAU-Autoren / FAU-Herausgeber

Eigler, Siegfried Prof. Dr.
Lehrstuhl für Organische Chemie II
Hauke, Frank Dr.
Zentralinstitut für Neue Materialien und Prozesstechnik
Hirsch, Andreas Prof. Dr.
Lehrstuhl für Organische Chemie II
Kolesnik-Gray, Maria Dr.
Lehrstuhl für Angewandte Physik
Krstic, Vojislav Prof. Dr.
Professur für Angewandte Physik
Maultzsch, Janina Prof. Dr.
Lehrstuhl für Experimentalphysik
Vecera, Philipp
Lehrstuhl für Organische Chemie II


Autor(en) der externen Einrichtung(en)
Technische Universität Berlin


Zitierweisen

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://dx.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).

BibTeX: 

Zuletzt aktualisiert 2018-18-07 um 07:23