Precise determination of graphene functionalization by in situ Raman spectroscopy.

Autor: Vecera P; Chair of Organic Chemistry II and Joint Institute of Advanced Materials and Processes (ZMP), Friedrich-Alexander University of Erlangen-Nuremberg, Henkestrasse 42, 91054 Erlangen, Germany., Chacón-Torres JC; Institut für Experimental Physik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany.; Yachay Tech University, School of Physical Sciences and Nanotechnology, Urcuquí 100119, Ecuador., Pichler T; Faculty of Physics, University of Vienna, Strudlhofgasse 4, A-1090 Vienna, Austria., Reich S; Institut für Experimental Physik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany., Soni HR; Chair of Theoretical Chemistry, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Egerlandstraße 3, 91058 Erlangen, Germany., Görling A; Chair of Theoretical Chemistry, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Egerlandstraße 3, 91058 Erlangen, Germany., Edelthalhammer K; Chair of Organic Chemistry II and Joint Institute of Advanced Materials and Processes (ZMP), Friedrich-Alexander University of Erlangen-Nuremberg, Henkestrasse 42, 91054 Erlangen, Germany., Peterlik H; Faculty of Physics, University of Vienna, Strudlhofgasse 4, A-1090 Vienna, Austria., Hauke F; Chair of Organic Chemistry II and Joint Institute of Advanced Materials and Processes (ZMP), Friedrich-Alexander University of Erlangen-Nuremberg, Henkestrasse 42, 91054 Erlangen, Germany., Hirsch A; Chair of Organic Chemistry II and Joint Institute of Advanced Materials and Processes (ZMP), Friedrich-Alexander University of Erlangen-Nuremberg, Henkestrasse 42, 91054 Erlangen, Germany.
Jazyk: angličtina
Zdroj: Nature communications [Nat Commun] 2017 May 08; Vol. 8, pp. 15192. Date of Electronic Publication: 2017 May 08.
DOI: 10.1038/ncomms15192
Abstrakt: The verification of a successful covalent functionalization of graphene and related carbon allotropes can easily be carried out by Raman spectroscopy. Nevertheless, the unequivocal assignment and resolution of individual lattice modes associated with the covalent binding of addends was elusive up to now. Here we present an in situ Raman study of a controlled functionalization of potassium intercalated graphite, revealing several new bands appearing in the D-region of the spectrum. The evolution of these bands with increasing degree of functionalization from low to moderate levels provides a basis for the deconvolution of the different components towards quantifying the extent of functionalization. By complementary DFT calculations we were able to identify the vibrational changes in the close proximity of the addend bearing lattice carbon atoms and to assign them to specific Raman modes. The experimental in situ observation of the developing functionalization along with the reoxidation of the intercalated graphite represents an important step towards an improved understanding of the chemistry of graphene.
Databáze: MEDLINE