The main purpose of this master's project is to characterize chemically modified electrodes (CMEs) by the formation of self-assembled monolayers (SAMs) with alkanethiols on the surface of the gold electrode. Check your behavior of electron transfer with solution K3[Fe(CN)6] and apply this electrode as biosensor. The self-assembled monolayers have been commonly used due to its homogeneous behavior, increasing the sensitivity and reproducibility of the electrode, also alter the reactivity and selectivity of the sensor base, making it possible to develop electrodes for various purposes and applications. In this project the SAMs will be formed from alkanethiol bromide 11 - mercaptoundecyl-N',N'',N'''-trimethylammonium and other alkanethiols with smaller carbon chains, checking the difference in behavior between these two compounds, and also focusing in the electronic transfer to the course of the carbon chains. For the characterization of SAMs will be used electrochemical techniques (cyclic voltammetry, chronoamperometry, chronocoulometry), infrared spectroscopy (FTIR), photoelectron spectroscopy, X-ray (XPS), atomic force microscopy (AFM) and scanning electron microscopy (SEM). After defining the parameters of composition and electrochemical characteristics of the CME in different ways, it is intended to perform tests to evaluate the electrocatalytic activity as biosensors for glucose, lactose and hydrogen peroxide.
News published in Agência FAPESP Newsletter about the scholarship: