Study of electrochemical detection, using modified electrodes policinilina in view the development of microsensors for the detection of food additives / Estudo da detecção eletroquimica, empregando eletrodos modificados com policinilina, tendo em vista o desenvolvimento de microssensores para a detecção de aditivos alimentares

AUTOR(ES)

Massaki de Oliveira Igarashi

FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

18/12/2009

RESUMO

This work presents a study for development of a microsensor for electrochemical analysis that can be applied in detection of food additives as sulfites and ascorbic acid. The development of low cost electrochemical instrumentation as alternative for commercial instrumentation available is a solution for any problems that appear in electrochemical sensors research. The definition of experiments looking for the modification of electrodes and microelectrodes, as well as verification of the interaction of polianiline conductor polymer (PANI) with some analytes (sulfite and ascorbic acid) is an important part of this work. This experiments definition contributed to prove the advantages of the superficial modification in electrochemical detections. A highlight is done for cyclic voltammetry and galvanic deposition techniques, both applied in deposition of polianiline and Ag/AgCl thin films for development of reference electrodes and microelectrodes; as well as the potentiometric electrochemical method that is a base for development of a new potentiometric detector as the presented in this work. Tests with a microfabricated microsensor were done to draw conclusions about positives and negatives aspects of geometry, dimensions and microsensor contacts. It allowed some tests with new geometry to future implementations and improvements in project and development of microfabricated microsensors.

ASSUNTO(S)

electrochemical analysis instrumentação eletroquímica de custo acessível polianilina microeletrodos microssensor análises eletroquímicas engenharias polianiline microelectrodes microsensor low cost electrochemical instrumentation

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