A Simple Nano NiMn2O4 Functionalized Graphite Electrode for Electrochemical Detection of Cinnamic Acid in Cinnamon Bark

In this work, a nickel-manganese oxide (NiMn2O4) nanoparticles modified graphite electrode (NiMn2O4@GPE) was fabricated to detect cinnamic acid (CA) in cinnamon bark. NiMn2O4 nanoparticles were synthesized using sonochemical sol-gel synthesis method. The nanoparticles of NiMn2O4 were characterized using X-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis revealing the crystallite size of 5.5 nm. The performance of the modified electrodes was studied using cyclic voltammetry (CV) and differential pulse voltammetry (DPV) techniques. NiMn2O4@GPE displays a wide range of 1– $1000~\mu $ M and limit of detection (LOD) of 24 nM under optimal experimental conditions. Moreover, NiMn2O4@GPE featured high repeatability, reproducibility, and long-term stability. The efficacy of the fabricated electrode was assessed with real sample (cinnamon bark) and in the range of 92%–106% recoveries were achieved.