Screen-Printed Electrode Surface Modification with NiCo₂O₄/RGO Nanocomposite for Hydroxylamine Detection

We developed a novel hydroxylamine sensor through the surface modification of screen-printed electrode (SPE) with NiCo₂O₄ nanoparticles/reduced graphene oxide (RGO) nanocomposite (NiCo₂O₄/RGO/SPE). We assessed the electrochemical response of hydroxylamine on the as-fabricated sensor, confirming the high electrocatalytic impact of hydroxylamine oxidation. The electrode produced sensitively responded to hydroxylamine under optimized conditions, with a low limit of detection (2.0 nM) and broad linear dynamic range (0.007-385.0 µM). The presence of NiCo₂O₄ combined with the modification of RGO resulted in sensitive detection and signal amplification of hydroxylamine oxidation. The proposed sensor was used to determine the existence of hydroxylamine in water samples.