5 years ago

Selective Bromination of Graphene Oxide by the Hunsdiecker Reaction

Selective Bromination of Graphene Oxide by the Hunsdiecker Reaction
Zdeněk Sofer, Jan Luxa, Ondřej Tomanec, Ondřej Jankovský, Martin Pumera, Radek Zbořil, David Sedmidubský, Michal Lojka
Halogenated graphenes have been attracting great attention in the recent years. The currently used methods are usually non-specific, and halogen groups are randomly distributed over the graphene. Here we demonstrate a selective graphene functionalization based on a well known reaction mechanism—Hunsdiecker reaction—applied on selective bromination of graphene oxide. The chemical analysis using various spectroscopic methods proved a high efficiency of this functionalization method. Bromination can be carried out under mild conditions without any high temperature or high pressure treatment. The chemical modification led to introduction of up to 20 wt.% of bromine covalently bonded to the graphene skeleton. The modified graphene was characterized in detail using a broad range of microscopic and spectroscopic methods and no significant contamination by reaction by-products was detected. Functionalized graphene oxide: Bromination of graphene oxide synthesized by two different methods has been carried out using the Hunsdiecker reaction. Large differences in the bromination behavior were observed for the two different materials. All materials were thoroughly characterized structurally and electrochemically.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/chem.201702031

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