Abstract
This work presents a series of experiments aimed at anchoring silver (Ag) and gold (Au) nanoparticles on graphene oxide (GO). In a first stage, the synthesis of colloidal nanoparticles was carried out using the Turkevich method, employing sodium citrate as reducing and stabilizing agent. Subsequently, the anchoring of the nanoparticles to the OG was implemented, which was synthesized using Hummers' method, involving the oxidation of graphite using potassium permanganate (KMnO4), sodium nitrate (NaNO3) and sulfuric acid (H2SO4). For anchoring, two methodologies were developed: (1) mixing of a solution of Au or Ag nanoparticles with graphene oxide, and (2) in-situ synthesis of the nanoparticles in an OG solution. The obtained samples were characterized by ultraviolet-visible spectroscopy (UV-Vis), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), dynamic light scattering (DLS) and powder X-ray diffraction (XRD). The results indicate that both methods are effective for nanoparticle anchoring, showing homogeneous distributions and good structural properties. This study provides a basis for the development of functional materials based on graphene and metal nanoparticles, with potential in catalytic and technological applications.
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