Catálogo de Investigaciones 2015-2016

44 CIENCIAS Electro Chemical Characterization of Custom Made Thin Film Gold Electrodes in Acid Media by Cyclic Voltammentry Electrochemical interface structure and composition knowledge is an important question in electrochemistry. The aim of this study is to control one of the variables of the electrochemical interface: the electrode surface. This works is aligned with the necessity to be effective in the proper use of waste materials, for that reason we recycled fragments of salvaged thin-layer gold supported on glass from various sources and from previous projects. In this project it is shown the preparation and electrochemical characterization of thin film gold electrodes that will be used as supporting phase in sensor design. Cyclic voltammetry is an electroanalytical technique useful to study electroactive species. Potential is applied to the electrode and the signal is recorded as a Current vs Voltage, called Cyclic Voltammorgram. CV is used as the fingerprint of the electrode surface composition and structure. To obtain well characterized gold electrode surfaces, is necessary the optimization of the electrode preparation treatment. Several thin layer gold electrodes were prepared. Annealing procedures were performed to alter the microstructure of the electrode in order to achieve a well- defined surface. Pretreatment produces reproducible blank signals of gold electrodes in 0.1 M sulfuric acid solution in contrast with chemical pretreatment typical used in this type of electrodes. lizmarie camacho investigación especial subgraduada mentor: dra. margarita rodríguez lópez electro chemistry surface science sensor design surface composition reactivity