Localized
Reduction of Graphene Oxide by Electrogenerated
Naphthalene Radical Anions and Subsequent Diazonium Electrografting
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Abstract
Herein, we describe a new localized
functionalization method of
graphene oxide (GO) deposited on a silicon oxide surface. The functionalization
starts with the reduction of GO by electrogenerated naphthalene radical
anions. The source of reducers is a microelectrode moving close to
the substrate in a typical scanning electrochemical microscopy (SECM)
configuration. Then, the recovery of electronic conductivity upon
reduction enables the selective electrochemical functionalization
of the patterns. The illustrative example is the electrografting of
reduced-GO with a diazonium salt bearing a protonated amino group
that can further immobilize gold nanoparticles by simple immersion.
This study opens new routes for the construction of multifunctional
patterned surfaces