Direct Coupling Of Phthalocyanine Cobalt(Ii) And Graphene Via Self-Driven Layer-By-Layer Assembly For Efficient Electrochemical Detection Of Catechol

Electrochemical detection of catechol (CC) based on the integrated nanocomposite electrodes with high sensitivity and excellent selectivity is highly desirable for environment monitoring and assessment. In this work, the methylated tetra-beta-(N,N-diethylaminoethoxy)phthalocyanine cobalt(II)/electrochemically reduced graphene oxide ((MtPcCo/ErGO)(n)) multilayer films were successfully constructed via a directly coupled layer-by-layer assembly strategy based on the electrostatic attraction as well as pi-pi stacking interaction, and consequent in situ electroreduction. The formation of the robust multilayer films only relies on the alternately self-driven combination of the [MtPcCo](4+) and GO but without addition of any polymer or surfactant adhesives. The directly coupled multilayer films can play such roles of coordination as promoting sensitive response signal, regulable layer architecture, oriented transmission of electrons, and electrical conductivity. As a result, the tailored (MtPcCo/ErGO) 10 film can work as an efficient electrocatalyst for CC oxidation and sensitive detection. The oxidation current density (j) of CC is widely linear to its concentration from 5 to 150 mu m and 150 to 350 mu m, respectively, with a low detection limit of 0.53 mu m (S/N = 3). Furthermore, the good selectivity, reproducibility and long-term storage stability make the multilayer film suitable for the practical CC determination. (C) 2020 The Electrochemical Society ("ECS"). Published on behalf of ECS by IOP Publishing Limited.