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

TL;DR

This paper introduces a green, visible-light-driven method for covalently attaching arylazo sulfones to reduced graphene oxide nanosheets, enabling functionalization under mild, environmentally friendly conditions without photosensitizers.

Contribution

It presents a novel, efficient approach for covalent functionalization of rGO with arylazo sulfones using visible light, expanding the functionalization options for graphene-based materials.

Findings

Successful covalent attachment of arylazo sulfones to rGO confirmed by XPS.

Mild reaction conditions without photosensitizers demonstrated.

Mechanistic insights obtained through Raman analysis.

Abstract

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.