Au Nanodendrites Decorated 2-(3,4-dihydroxybenzaldehyde) Malononitrile Modified Electrode for Electrocatalytic Determination of Hydrazine in the Presence of Hydroxylamine

Abstract

A selective and sensitive method was proposed for the determination of hydrazine by electrochemical deposition of Au nanodendrites (AuNDs) on the electropolymerized-2-(3,4-dihydroxybenzaldehyde) malononitrile (AuNDs/HBM/GCE). Deposition of AuNDs on the surface of HBM modified electrode effectively increased the electron transfer and active surface area. The surface analysis techniques substantiated the deposition of AuNDs and HBM molecules at the electrode surface. As-prepared modified electrode produced a sharp peak for hydrazine oxidation at [Formula: see text] versus Ag/AgCl, with a significant negative potential shift (about 0.43[Formula: see text]V) compared with unmodified glassy carbon electrode (GCE). The proposed electrode showed a linear response over 0.2[Formula: see text][Formula: see text]M–2.4[Formula: see text]mM with the detection limit of 0.08[Formula: see text][Formula: see text]M ([Formula: see text]. Moreover, AuNDs/HBM/GCE exhibited appropriate stability, selectivity and reproducibility. One of the brilliant advantages of the proposed method is the determination of hydrazine in the presence of hydroxylamine. The peaks of these two compounds are completely separate at [Formula: see text] and [Formula: see text][Formula: see text]V. Therefore, the fabricated electrode is capable of hydrazine quantification in real samples without apparent hydroxylamine interference.