Electrochemical sensing platform for stable detection of trace Cu2+ based on ZIF-67/GO/Nafion/GCE

Nanododecahedral ZIF-67 crystals were successfully synthesized by a simple coprecipitation method at room temperature and constructed with graphene oxide (GO) and Nafion as an electrochemical sensing platform for Cu2+. The properties of the electrode and the modified materials were analysed by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), square wave stripping voltammetry (SWSV), scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The experimental results show that the ZIF-67/GO/Nafion/GCE sensor platform has a stronger adsorption effect on Cu2+. It has high sensitivity (101.29 mu A.mu M-1) and a low detection limit (7.55 nM) in the linear range of 0.01 to 1.0 mu M, as well as long-term stability, good repeatability and selectivity. The recovery rate was between 95.7 and 102.7% for real water samples. The method can be used for the trace analysis of Cu2+, which is valuable for the detection of trace metal ions in real water samples.