A novel catechin electrochemical sensor based on a two-dimensional MOFs material derivative Zn doped carbon nanosheets and multi-walled carbon nanotubes composite film.

In this paper, the precursor ZIF-8/NaCl composite material was successfully synthesized by the in-situ synthesis method, and the two-dimensional zinc doped carbon nanosheets (Zn CNs) were obtained after heat treatment of the precursor. Zn CNs were electrodeposited on carboxylated carbon nanotubes (MWCNTs-COOH) modified glass carbon electrode (GCE) to construct an electrochemical sensor for catechins. The materials are characterized using scanning electron microscope, X-ray photoelectron spectroscopy, and nitrogen adsorption-desorption isotherm. Zn CNs/MWCNTs-COOH composite provide the sensor with excellent electrochemical and electrocatalytic performance. Therefore, the sensor has a wide detection range (30.0-738 nM) and a low detection limit (LOD = 10.0 nM) for catechins. The effectiveness of the sensor was also verified in actual sample detection with good stability and accuracy. This study may provide a feasible solution for the detection of catechin.