Síntese e caracterização de nanocompósitos derivados do óxido de grafeno pela incorporação de nanopartículas metálicas de Ag, Fe e Ni, com aplicações tecnológicas.

Abstract

Nanoscience and nanotechnology (N&N) bring major breakthrough in the development of new materials that improve the properties of conventional materials, both increase as a property to assign a different property from the source material. In this context of N&N is graphene, isolated monolayer of graphite and in 2014 celebrates 10 years since it was first reported. Holder much coveted properties, combine it with new materials is a challenge that is being wisely managed by materials engineers. In the present work aimed to prepare chemically modified graphene (CMG) with the incorporation of metal nanoparticles (NP) and then test the properties of this new material. But this synthesis cannot be done directly, by the impossibility of connecting metals NP to graphene in one step. So the graphite feedstock for the preparation of CMG, was oxidized and formed the main intermediary of CMG, graphite oxide (GO). This GO was dispersed in the metal ion solution together with citric acid and ethylene glycol, such reagents which were used to add the metal ion to the GO sheets. With heat treatment in a tubular oven and inert atmosphere, the GO and metal were reduced together. The GO intermediate was characterized by FTIR, XRD, SEM, BET and TGA. The reduced graphite oxide functionalized with metal NP was characterized by XRD, EDX, TEM, SEM, electrical and magnetic measurements. The performance of the new material was tested in technological tests of catalytic activity of decomposition of methane to hydrogen generation.