4.4 Article

Sensitive electrochemical detection of 4-nitrophenol through Copper doped CeO2 nanoparticles

Journal

JOURNAL OF ELECTROCERAMICS
Volume 47, Issue 2, Pages 51-59

Publisher

SPRINGER
DOI: 10.1007/s10832-021-00259-2

Keywords

Cerium oxide; Copper; Nitrophenol; Impedance; Sensing

Funding

  1. Deanship of Scientific Research at King Saud University [RG-1439-089]

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In this study, an electrochemical sensor was developed for sensitive detection of 4-nitrophenol (4-NP) in solution using copper-doped cerium oxide nanoparticles (CeO2:Cu NPs). The performance of the sensor was evaluated, showing excellent electrochemical properties and high sensitivity for 4-NP detection. The constructed sensor demonstrated a high linearity range, a good detection limit, and stability during repeated cycles, making it a promising tool for environmental monitoring.
In this study, we developed an electrochemical sensor for sensitive detection of 4-NP in solution by using polyol-assisted co-precipitation process prepared copper doped cerium oxide nanoparticles (CeO2:Cu NPs). Phase purity, crystal structure, and morphology of the as-prepared nanoproduct were examined by X-ray diffraction and transmission electron microscopy images. Chemical composition was determined by energy dispersive x-ray analysis(EDX). UV/Visible spectrum was measured to determine the optical absorption properties and bandgap energies of the material. The prepared CeO2:Cu NPs were pasted on a glassy carbon electrode(GCE) to measure the electro-catalytic performance and further examining their sensing application through determining the 4-nitrophenol (4-NP) concentrations. The performance of the constructed electrode was assessed by cyclic voltammetry(CV) and electrochemical impedance spectroscopic(EIS) methods. The Cu doped CeO2 NPs exhibited demonstrated excellent electrochemical performance in the presence of 4-NPs in a 10 pH phosphate buffer solution (PBS). The voltammetry-acquired kinetic evidence shows that 4NP electro-oxidation is a strictly diffusion-controlled process and that four electrons are involved in the reaction mechanism. The constructed CeO2:Cu/GCE illustrated a high linearity range from 7.18-5000 mu L, a good detection limit (7.18 mu L), with high sensitivity 1.4 mu A mmol(-1) L. The reproducibility of the fabricated electrode was also monitored through nine consecutive CV cycles to measure their stability.

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