An electrochemical sensing platform based on Fe₃O₄@CuO core-shell nanocomposite modified screen printed graphite electrode for sensitive hydroxylamine detection

ABSTRACT

In this work, a sensitive electrochemical sensor is provided for hydroxylamine, by Fe₃O₄@CuO core-shell nanocomposite on the screen printed graphite electrode (SPGE) surface. Fe₃O₄@CuO core-shell nanocomposite was prepared by simple method and characterised by transmission electron microscopy (TEM), scanning electron microscopy (SEM), vibrating sample magnetometry (VSM), energy-dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD). The modification of sensor was performed by drop-casting process. Electrochemical investigations showed that the fabricated Fe₃O₄@CuO/SPGE sensor exhibited excellent catalytic performance for the oxidation of hydroxylamine. The Fe₃O₄@CuO/SPGE exhibited good electrocatalytic performances towards hydroxylamine by using differential pulse voltammetry (DPV) with a sensitivity about 0.1439 μA μM⁻¹ and a low limit of detection (LOD) (6.0 nM) in the linear range of 0.01–340.0 μM. In addition, the Fe₃O₄@CuO/SPGE showed an acceptable repeatability, reproducibility and stability in the detection of hydroxylamine. Finally, the practical utility of this new sensor was substantially revealed for detecting hydroxylamine in different water samples.

KEYWORDS:

• Electrochemical sensor
• hydroxylamine
• Fe₃O₄@CuO core-shell nanocomposite
• differential pulse voltammetry

Disclosure statement

No potential conflict of interest was reported by the author(s).