To deposit the MIP film, 2.5 mL of a solution containing 0.1 M pyrrole (17.34 µL), previously filtered on an Al2O3 column, 1 mM Py-COOH (0.348 mg), and 0.5 mM MTZ (0.214 mg), in 1.0 M aqueous solution of KCl (supporting electrolyte) was prepared. The solution was thoroughly stirred on a vortex and subjected to ultrasonication for 5 to 10 min until complete dissolution after each component of the mixture was added. Then, the solution was purged with argon for at least 10 min to remove oxygen.