Obtenção de nanocompósitos formados por partículas metálicas e polímeros condutores suportados em substrato de sílica

Abstract

Nanocomposites constitute a class of materials created by the union of two or more other materials and which properties are different from their isolated components and hence, nowadays, they are the object of many studies. Among the many possibilities are the nanocomposites, in which at least one of the precursors is in nanometric scale, and they have been receiving special attention thanks to the great diversity of properties of metallic nanoparticles (NPs). The study of the synthesis of nanocomposites shows scientific and technological relevance, especially when it comes to said materials integrated to matrixes that might improve those unique properties, like conducting polymers (CPs), and already supported in substrates which allow their use afterwards. With that said, the objective here are the chemical synthesis and the characterization of nanocomposites composed of silver NPs in a matrix of sulfonated polyaniline supported on a surface of silica aiming at the production of materials with potential application for optical sensors. The synthesis method used is called the single route, where the metallic cation itself is the responsible for the oxidation of the polymer, resulting in the cations reduction. The obtained material was characterized by X-ray diffraction, transmission electron microscopy, Raman spectroscopy and UV-Vis spectroscopy.