Graphene/AuNps SERS thin films
Résumé
We explore the preparation and use of graphene dispersions and graphene-nanoparticles composites via
wet routes in order to create organized thin films (for passivation, adhesion and design of SERS substrates, see
Fig.) At large concentrations, the liquid crystal ordering is an opportunity to spontaneously organize the materials.
At lower concentrations, a special care has to be taken during the deposition of the thinnest films.
In this work, we have focused on the design and the characterization of thin layers made of graphene oxide and
gold nanoparticles (GO/AuNps) for their Surface Enhanced Raman Spectroscopy (SERS) properties. The objective
here is to establish the main rules that control (during the deposition) the structure of the films and their resulting
SERS properties. We have used various techniques such as dip-coating, spin coating with varying parameters, as
well as surface functionalization before deposition. The thin films have been characterized by AFM and their
performance have been tested with Raman spectroscopy.