Fabrication of a novel electrochemical sensor using conductive MOF Cu-CAT anchored on reduced graphene oxide for BPA detection

A series of conductive metal–organic frameworks (M-CATs) were synthesized using 2,3,6,7,10,11-hexahydroxytriphenylas a ligand following a solvothermal method, and the Cu-CAT system exhibiting the best performance was identified. Conductive Cu-CAT-anchored reduction graphene oxide composites (Cu-CAT@rGO) were prepared following a hydrothermal method. The microstructures of the systems were further characterized using X-ray diffraction, scanning electron microscopy, energy dispersion spectroscopy, and transmission electron microscopy techniques. The drip-casting membrane method was used for the fabrication of a novel electrochemical sensor based on the conductive Cu-CAT-anchored rGO (Cu-CAT@rGO/GCE). The electrochemical performance of Cu-CAT@rGO/GCE was studied using electrochemical impedance spectroscopy and cyclic voltammetry techniques. The differential pulse voltamme try  technique was used for electrochemical sensing to detect the content of bisphenol A (BPA) in beverage bottles. An excellent linear detection range (0.05–100 µmol L −1 ) and a low detection limit (4.9 nmol L − 1 ; based on S/N = 3) were recorded. Therefore, this method can potentially be used to develop a new route for the detection of BPA. Graphical abstract