Development of NiCoO₂ Nanoparticles based Electrochemical Sensor with Extremely Low Detection for Hazardous 4-Nitrophenol

Abstract

In this study, we report the synthesis of Nickel Cobalt Oxide (NiCoO2) nanoparticles by the solution combustion method using Citric acid, Glycine, Urea, and Glucose as green fuels, for the electrochemical detection of 4-nitrophenol (4-NP) is reported. The synthesized NiCoO2 nanoparticles were characterized using X-ray diffraction (XRD), Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Analysis (EDAX). It was found from XRD and SEM, that the NiCoO2 synthesized using urea as a fuel had smallest crystalline size and promising morphology and hence this sample was used for electrochemical studies. Cyclic Voltammetry (CV) was employed to investigate the electrochemical behaviour of the synthesized NiCoO2 nanoparticles towards 4-Nitrophenol (4-NP) detection. It was found that the NiCoO2 nanoparticles exhibited a strong electrochemical response towards the detection of 4-NP, with a linear range of 10-100 µL and the lowest detection limit of 6.83nM. Overall, the NiCoO2 nanoparticles synthesized using the solution combustion method show an excellent potential for the detection of hazardous 4-NP, which could be applied in environmental sensing applications.

Graphene Loaded ZrO2 Nanocomposite for Antioxidant, Dye Removal, Electrochemical and Green Sensor Studies

“…The PXRD patterns obtained from the synthesized rGO, ZrO 2 , and the ZrO 2 /rGO nanocomposite samples exhibit peaks characterized by intensified intensity and distinct sharpness, indicating a notable degree of crystallinity. [34,35] The presence of peaks in the spectrum indicates a wellcrystalline nature of particles. Crystalline dimensions were evaluated by employing Scherrer's formula in conjunction with the Williamson and Hall methodology.…”