Construção de sensores eletroquímicos utilizando como matriz materiais cerâmicos SI O IND. 2 / M IND. X O IND. Y , e materiais cerâmicos eletricamento condutores SI O IND. 2 / C/ M IND. X O IND. Y , preparados pelo processo sol-gel / Construction of electrochemical sensors using ceramic materials SI O IND. 2 / M IND. X O IND. Y and electrically conducting ceramic materials SI O IND. 2 /C/ M IND. X O IND. Y as matrix, prepared for the sol-gel process

AUTOR(ES)

Thiago da Cruz Canevari

FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

26/04/2012

RESUMO

This work describes the synthesis and characterization of three different materials: SiO2/SnO2, SiO2/SnO2/Sb2O5 and the film of Nb2O5 formed on the surface of the ceramic material SiO2/C obtained by sol-gel process and to use them as matrix in the development of electrochemical sensors. The mixed oxides, SiO2/SnO2, were synthesized using as source of SnO2, SnCl4.5H2O, using different acid catalysts HCl and HF (F). The structural and morphological differences provided by mixed oxides, SiO2/SnO2, due to the use of different catalysts were evaluated by using several like area superficial BET technique, ray X fluorescence spectroscopic, ray X diffraction, IV spectroscopic, transmission electron microscopic (TEM), ray X spectroscopic photoelectron excited (XPS) and electrical conductivity and electrochemical measurements in order to use these mixed oxides as matrix support for development of electrochemical sensors. The material SiO2/SnO2/Sb2O5 was obtained by incorporation of Sb2O5 on the surface of the mixed oxide SiO2/SnO2, previously synthesized using as source of SnO2, dibutildiacetate of tin. This coating was performed using, CH2Cl2 dry, in inert atmosphere, using the technique of "Grafting." The SiO2/SnO2/Sb2O5 material was characterized using area superficial BET technique, ray X fluorescence spectroscopic, scanning electron microscopic (SEM), energy dispersive spectroscopic (EDS) and ray X spectroscopic photoelectron excited (XPS). On this material was immobilized on the cationic dye Meldola Blue, which was prepared in a rigid disk electrode to study the electrooxidation of the cofactor NADH using cyclic voltammetry and chronoamperometry technique for the development of an electrochemical biosensor. The formation of Nb2O5 film on the surface carbon ceramic material SiO2/C, using the technique of spin-coating was carried out after material for SiO2/C is synthesized using the sol-gel process. Nb2O5 film prepared was characterized using scanning electron microscopic (SEM), energy dispersive spectroscopic (EDS) and ray X spectroscopic photoelectron excited (XPS). With this material was prepared a disc rigid electrode in order to study the electrooxidation of phenolic isomers, hydroquinone and catechol in the presence of resorcinol using differential pulse voltammetry technique.

ASSUNTO(S)

sol-gel Óxidos mistos sio2/mxoy sio2/c/mxoy sol-gel mixed oxides sio2/mxoy sio2/c/mxoy

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