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19 April 2024 |
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Covalent functionalization by cycloaddition reactions of pristine, defect-free graphene | | L. Daukiya
; C. Mattioli
; D. Aubel
; S. Hajjar-Garreau
; F. Vonau
; E. Denys
; G. Reiter
; J. Fransson
; E. Perrin
; M-L. Bocquet
; C. Bena
; A. Gourdon
; L. Simon
; | | Date: |
11 Apr 2016 | | Abstract: | Based on a low temperature scanning tunneling microscopy study, we present a
direct visualization of a cycloaddition reaction performed for some specific
fluorinated maleimide molecules deposited on graphene. These studies showed
that the cycloaddition reactions can be carried out on the basal plane of
graphene, even when there are no pre-existing defects. In the course of
covalently grafting the molecules to graphene, the sp2 conjugation of carbon
atoms was broken and local sp3 bonds were created. The grafted molecules
perturbed the graphene lattice, generating a standing-wave pattern with an
anisotropy which was attributed to a (1,2) cycloaddition, as revealed by
T-matrix approximation calculations. DFT calculations showed that while both
(1,4) and (1,2) cycloaddition were possible on free standing graphene, only the
(1,2) cycloaddition could be obtained for graphene on SiC(0001). Globally
averaging spectroscopic techniques, XPS and ARPES, were used to determine the
modification in the elemental composition of the samples induced by the
reaction, indicating an opening of an electronic gap in graphene. | | Source: | arXiv, 1604.3125 | | Services: | Forum | Review | PDF | Favorites | |
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