Abstract: The invention relates to an electrochemical sensor for the detection of analytes in liquid media which comprises 4 layers, wherein the first layer (1) comprises a carbonaceous material deposited on a substrate, said layer forming the system of electrodes of the electrochemical sensor, formed at least by a pseudo-reference electrode, a working electrode and a counter electrode; and the fourth layer (4) comprises polythiophene deposited only on the lower end of the working electrode selected from (d1), which comprises a layer comprising a polythiophene deposited on the lower end of the working electrode and a layer comprising a non-conductive polymer gel deposited on said layer of polythiophene; (d2), which is a layer of conductive polymer gel comprising a non-conductive polymer gel and a polythiophene; and (d3), which comprises a layer comprising a polythiophene deposited on the lower end of the working electrode and a layer comprising functionalized magnetic nanoparticles deposited on said layer of polythioph

Abstract: The present invention relates to a process for obtaining a metal, ceramic or composite coating on the surface of a non-conductive material such as plastic, ceramic or wood which comprises: A) preparing a polypyrrole dispersion in aqueous base paint or in an acid type water-soluble pure resin; B) diluting the dispersion resulting from the previous stage with an alcohol in a factor of 1.5; C) applying the dispersion of the conductive polymer resulting from stage B) on the surface to be coated and drying same; and D) obtaining the metal, ceramic or composite coating by means of an electrolytic process or an electrophoretic deposition.