Filmes de nanocompósitos de polímero condutor, nanopartículas de argila e nanopartículas de ouro para aplicação em sensores ambientais

• Ano de defesa: 2015
• Autor(a) principal: Barros, Anerise de [UNESP]
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual Paulista (Unesp)
• Palavras-chave em Português: Nanopartículas; Ions metalicos; Detectores infravermelhos; Filmes finos multifolhados; Nanoparticles
• Link de acesso: http://hdl.handle.net/11449/132757; http://www.athena.biblioteca.unesp.br/exlibris/bd/cathedra/15-12-2015/000853087.pdf

In this work, nanocoposites of polyaniline emeraldine salt (PAni-ES), organophilic montmorillonite clay (MMTO) and sodium (Na+-MMT) and gold nanoparticles (AuNPs) were obtained through the techniques of Langmuir-Blodgett (LB) and Layer-by-Layer (LbL). The materials were deposited on various solid substrates and characterized by spectroscopic and microscopic methods, in order to ascertain the interaction and synergy between the materials involved. Satisfactory results were obtained by the methods of characterization of the films by ultraviolet visible (UV-vis), Fourrier transform Infrared spectroscopy (FTIR), Raman spectroscopy and atomic force microscopy (AFM), showing the efficiency in the process of obtaining nanocomposites through the LbL and LB techniques. In general, the results demonstrated influences the properties of the clays in the PAni-ES altering the condutivity thereof. Although the clays decreased the conductive properties of PAni-ES, but still is a good feature observed the presence of clays decreased the conductive properties of PAni-ES, but still is a good feature observed the presence of clay in the nanocomposite films to maintain their properties during electrochemical processes. Morphological analysis by AFM shows interesting characteristics for the films of polymer-clay nanocomposites, with less rough and consequently thinner films. The nanostructure films were evaluated how sensing unit from the electrochemical methods, by cyclic voltammetry (CV) and square wave anodic stripping voltammetry (SWASV). Aiming the application for the environmental area to detect metal ions of copper, lead and cadmium (cu2+, Pb2+ e Cd2+). The insertion of tiolateds gold nanoparticles (AuNPs) favors the increase in conductivity of the films, thus promoting the catalytic activity of the sensors. Consequently increase the sensibility and lower limit of detection when compare to the films absent of gold nanoparticles