On the Suitability of Raman Spectroscopy to Monitor the Degree of Graphene Functionalization by Diazonium Salts
Sampathkumar, Krishna (Brno University of Technology)
Diez Cabanes, Valentin (University of Mons)
Kovaricek, Petr (J.Heyrovsky Institute of Physical Chemistry)
Del Corro, Elena (Institut Català de Nanociència i Nanotecnologia)
Bouša, Milan (J.Heyrovsky Institute of Physical Chemistry)
Hošek, Jan (Czech Technical University in Prague)
Kalbáč, Martin (J.Heyrovsky Institute of Physical Chemistry)
Frank, Otakar (J.Heyrovsky Institute of Physical Chemistry)

Data:	2019
Resum:	Raman spectroscopy is undoubtedly the most frequently used technique for universal characterization of graphene and related materials. Quantification of parameters like disorder or strain is possible through analysis of particular Raman bands. However, under certain conditions, such evaluation can be jeopardized by - sometimes hidden - convolution of more overlapping effects. In this work, graphene functionalization by the common nitrobenzenediazonium salt under simultaneous biaxial tensile deformation induced by substrate swelling was investigated by Raman spectroscopy. As expected, the disorder-related D band appeared in the spectra documenting the covalent attack on the graphene lattice. However, the strain-induced shift of the graphene bands exposed additional peaks, masked at exactly the same positions as the unstrained graphene bands. The new bands were assigned to vibrations of the diazonium molecule and its decomposition products adsorbed on top of the functionalized graphene. The external strain thus provided means for more correct quantification of the lattice disorder.
Drets:	Aquest material està protegit per drets d'autor i/o drets afins. Podeu utilitzar aquest material en funció del que permet la legislació de drets d'autor i drets afins d'aplicació al vostre cas. Per a d'altres usos heu d'obtenir permís del(s) titular(s) de drets.
Llengua:	Anglès
Document:	Article ; recerca ; Versió sotmesa a revisió
Matèria:	Decomposition products ; External strains ; Functionalizations ; Functionalized graphene ; Graphene lattices ; Lattice disorders ; Overlapping effect ; Strain-induced shifts
Publicat a:	Journal of physical chemistry. C, Vol. 123, Issue 36 (September 2019) , p. 22397-22402, ISSN 1932-7455

DOI: 10.1021/acs.jpcc.9b06516

Preprint 27 p, 1.5 MB

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