A Sensor Constructed with Nickel-Doped Carbon Nanotube Composites based on MOFs for Detecting Ascorbic Acid and Dopamine Simultaneously

In this study, a bimetallic metal-organic framework material (ZnNi MOFs) was synthesized via the solvothermal method, which was then calcined at high temperatures to produce a nickel-doped carbon nanotube material.Scanning Electron Microscope (SEM), X-ray diffractometer, X-ray Photoelectron Spectroscopy (XPS), Fourier Transform Infrared Spectroscopy (FT-IR), and electrochemical techniques were used to characterize the composition, structural characteristics, and performance of the material. Experiments show that the sensor based this proposed material exhibits good electrocatalytic activities to the oxidation of ascorbic acid (AA) and dopamine (DA) and can be employed to simultaneously detect them. Under the optimal conditions, the oxidation currents of AA and DA exhibit a marked linear relationship with their respective concentrations within the domain of 500.00–9500.00 and 0.50–150.00 μM, respectively. The detection limits were 20.18 and 0.04 μM, respectively. And the sensor was effectively used to detect AA and DA in urine sample simultaneously. The sensor possesses excellent stability, reproducibility, resistance to interference, and broader linear ranges with potential applications.