Caracterização por espectroscopia vibracional de filmes Layer-by-Layer contendo ftalocianina, polímeros condutores e gomas naturais
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2009-06-19Type
Graduate program
Ciência e Tecnologia de Materiais - FC
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Esta dissertação apresenta o estudo do crescimento (em escala nanométrica) e morfológica (em escala micrométrica) de filmes finos fabricados segundo a técnica Layer-by-Layer (LbL) contendo ftalocianina tetrasulfonada de níquel, polímeros condutores, o polímero poli(alilamina hidroclorada) (PAH), e gomas naturais. Três sistemas foram investigados: i) filmes LbL de NiTsPc e PAH; ii) filme LbL de NiTsPc, PAH e gomas naturais e iii) filmes LbL dos polímeros condutores polianilina (PANI) e poli(o-metoxianilina) (POMA) com gomas naturais. As gomas utilizadas neste trabalho foram extraídas das árvores cajueiro (Anacardium occidentale), chichá (Sterculia striata), caraia (Sterculia urens) e angico (Anadenanthera macrocarpa Benth). As caracterizações destes filmes foram realizadas por meio das técnicas de espectroscopia eletrônica utilizando absorção na região do ultravioleta-visível (UV-vis), espectroscopia vibracional por espalhamento micro-Raman e por absorção na região do infravermelho (IV) com transformada de Fourier (FTIR). Os resultados deste trabalho mostraram que, somente os filmes de NiTsPc e PAH em pH 8,5 e os filmes de NiTsPc, PAH e gomas naturais apresentaram crescimento controlado, uniformidade morfológica e química.
This dissertation presents the study of growth (in nano-scale thickness) and morphology (micrometric scale) of thin films produced using the Layer-by-Layer technique (LbL) containing nickel tetrasulfonated phthalocyanine, conducting polymers, the polymer poly(allylamine hydrochloride) (PAH), and natural gums. Three systems were investigated: i) LbL films of NiTsPc and PAH; ii) LbL films of NiTsPc, PAH and natural gums and iii) LbL films of the conducting polymers polyaniline (PANI) and poly (o-methoxyaniline) (POMA) with natural gums. The gums used in this work were obtained from the cashew (Anacardium occidentale), chicha (Sterculia striata), caraia (Sterculia urens) and angico (Anadenanthera macrocarpa Benth) trees. The characterizations of the LbL films were made using the ultraviolet-visible (UV-vis) absorption spectroscopy, vibrational spectroscopy through micro-Raman scattering and Fourier Transform infrared (FTIR) absorption. The results showed that only the LbL films of NiTsPc and PAH at pH 8.5 and the LbL films of NiTsPc, PAH and natural gums present controlled growth and morphological and chemical uniformity.
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