Abstract
Reduced graphene oxide (rGO) layers are known to be significantly
conductive along the basal plane throughout delocalized sp(2) domains
Defects present in rGO implies in disordered systems with numerous
localized sites, resulting in a charge transport governed mainly by a 2D
variable range hopping (VRH) mechanism These characteristics are
observed even in multilayered rGO since the through-plane conduction is
expected to be insubstantial. Here, we report on the multilayer assembly
of functionalized rGO quantum dots (GQDs) presenting 3D VRH transport
that endows elevated charge carrier mobility, ca similar to 236 cm(2)
V(-1 )s(-1). Polyelectrolyte-wrapped GQDs were assembled by
layer-by-layer technique (LbL), ensuring molecular level thickness
control for the formed nanostructures, along with the adjustment of the
film transparency (up to 92% in the visible region). The small size and
the random distribution of GQDs in the LbL structure are believed to
overcome the translational disorder in multilayered films, contributing
to a 3D interlayer conduction that enhances the electronic properties.
Such high-mobility, transparency-tunable films assembled by a
cost-effective method possess interesting features and wide
applicability in optoelectronics.
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