Abstract
Electrochemical sensors are developing very fast because of the possibilities of generating miniaturized and simplified low-cost analytical devices. However, methodologies still require highly detectable electroactive labels and sensitive detection strategies. The electrochemical signal of a molecule that can be employed as biolabel, methylene blue (MB), is enhanced using nanostructured screen-printed gold electrodes. A dispersion of amino-functionalized multiwalled carbon nanotubes in Nafion/ethanol:water (1:1) is employed for modification by drop-casting. This produces a change in the electrochemical behavior of the dye MB, with increase in both reversibility and peak current. Moreover, adsorption occurs on modified electrodes. This allows a higher enhancement of the signal by introducing a previous accumulation step. This chapter includes the procedure to nanostructure the working electrode and obtain the analytical signal with a sensitive methodology, as well as important steps that should be considered by students when running the experiment and reporting the results.
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