The special electronic, optical,
thermal, and mechanical properties of graphene
resulting from its 2D nature, as well as the ease of functionalizing
it through a simple acid treatment, make graphene an ideal building
block for the development of new hybrid nanostructures with well-defined
dimensions and behavior. Such hybrids have great potential as active
materials in applications such as gas storage, gas/liquid separation,
photocatalysis, bioimaging, optoelectronics, and nanosensing. In this
study, luminescent carbon dots (C-dots) were sandwiched between oxidized
graphene sheets to form novel hybrid multilayer films. Our thin-film
preparation approach combines self-assembly with the Langmuir–Schaefer
deposition and uses graphene oxide nanosheets as template for grafting
C-dots in a bidimensional array. Repeating the cycle results in a
facile and low-cost layer-by-layer procedure for the formation of
highly ordered hybrid multilayers, which were characterized by photoluminescence,
UV–visible, X-ray photoelectron, and Raman spectroscopies,
as well as X-ray diffraction and atomic force microscopy.