Electrochemical Oxidation of Dopamine and Uric Acid at Nickel Zinc Nanoferrites Multiwalled Carbon Nanotube-Based Nanocomposites Modified Carbon Paste Electrode: A Voltammetic Study

Nickel Zinc Nanoferrites multiwalled carbon nanotube-based nanocomposites were synthesised by coprecipitation method and characterised by X-ray diffraction, Fourier-transform infrared spectroscopy, scanning electron microscopy, and energy-dispersive X-ray analysis. The nanocomposites were used to modify the carbon paste electrode and were then employed as a working electrode in the voltammetric detection of uric acid (UA) and dopamine (DA). Electrochemical oxidation was carried out with these nanocomposites and a carbon paste electrode in a 0.2 M phosphate buffer solution at a scan rate of 0.05 Vs^-1. The electrochemical response of DA and UA was studied via scan rate, concentration, and pH variation. The potential peak difference for DA-UA was large to detect both individually and selectively, and the nanocomposites was used for prolonged analysis of DA and UA in real samples.