MATERIAIS HÍBRIDOS POLIANILINA/SÓLIDOS LAMELARES (MoS2 e Grafite) OBTIDOS EM UMA ÚNICA ETAPA

Abstract

In this research, we describe a synthesis of two new hybrid materials formed between: i) polyaniline and molybdenum disulfide (MH_MoP) and ii) polyaniline and graphite (MH_GP). Both of them, obtained by a single-step procedure, which differs from studies already reported involving many steps. This route allows obtaining homogeneous materials on a large scale and can be kept stored in acid solution with the purpose of facilitating its application. The materials (precursors and hybrids) were characterized by different techniques. The spectroscopic techniques confirm the formation of polyaniline in the emeraldine salt form, besides allowing to assign to optical properties of the hybrid materials, one can examine the influence of MoS2 and graphite in forming the polymeric matrix. It can be observed in SEM images that inorganic materials (MoS2 and graphite) are enclosed by the polymer, so that inorganic phase is presented homogenously dispersed in polymeric matrix. This engagement of the inorganic phase by Pani is in agreement with the X-ray diffraction data. It was observed by simultaneous thermal analysis (STA) that the materials have distinct behavior from their precursors, indicating that there are strong interactions between polyaniline and inorganic phases. Cyclic voltammetry results demonstrate its potential application as work electrode modifier, as well as applying as chemical and electrochemical sensors. When the hybrid materials were exposed to ammonia vapor, observe its conversion of emeraldine salt (green) to emeraldine base (blue). This color change is a reversible process, indicating that the hybrid materials have potential application as optical sensor ammonia and its derivatives.