Screen-Printed Electrode Surface Modification with NiCo 2 O 4 /RGO Nanocomposite for Hydroxylamine Detection.

We developed a novel hydroxylamine sensor through the surface modification of screen-printed electrode (SPE) with NiCo 2 O 4 nanoparticles/reduced graphene oxide (RGO) nanocomposite (NiCo 2 O 4 /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 NiCo 2 O 4 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.