Visible-Light Assisted Covalent Surface Functionalization of Reduced Graphene Oxide Nanosheets with Arylazo Sulfones

We present an environmentally benign methodology for the covalent functionalization (arylation) of reduced graphene oxide (rGO) nanosheets with arylazo sulfones. A variety of tagged aryl units were conveniently accommodated at the rGO surface via visible-light irradiation of suspensions of carbon nanostructured materials in aqueous media. Mild reaction conditions, absence of photosensitizers, functional group tolerance and high atomic fractions (XPS analysis) represent some of the salient features characterizing the present methodology. Control experiments for the mechanistic elucidation (Raman analysis) and chemical nanomanipulation of the tagged rGO surfaces are also reported.

Automated summary

This methodology involves environmentally friendly covalent functionalization of reduced graphene oxide (rGO) nanosheets with arylazo sulfones through visible-light irradiation. It allows various tagged aryl units to be conveniently accommodated on the rGO surface, with mild reaction conditions, absence of photosensitizers, functional group tolerance, and high atomic fractions. Control experiments for mechanistic elucidation (Raman analysis) and chemical nanomanipulation of the tagged rGO surfaces were also conducted.