This research presents the development of a electrochemioluminescence (ECL) based sensor aimed to detect phenothiazine in physiologic solutions. To develop this sensor, three materials were used, being glass carbon, gold and indium-tin oxide (ITO) for the working electrode of the sensor. The working electrode was modified by the deposition of a composite thin film of TiO2/nafion in its surface. Each material then was compared in terms of the ECL signal intensity between themselves and data from

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... previous researches. The novelty presented in this work is the use of gold and ITO as base materials for the working electrode of the sensor. Also, as a novelty, this research presents a study of the influence of the film thickness over the ECL signal intensity. This thesis presents studies concerning the optimization of the TiO2/nafion film and the influence of the working electrode material, aiming to produce the best possible sensor for phenothiazine in physiological solutions. ECL based sensor are often used today due to their great selectivity and sensibility. They are mainly used for detecting macromolecules, such as DNA and proteins in physiologic solutions. Phenothiazine is an interesting substance because its derivatives are commonly used on pharmaceutical drugs used to treat phycological diseases, such as depression and schizophrenia.