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.

Electroanalysis of Catechol and Hydroquinone by Glassy Carbon Electrode Modified with Multi-Walled Carbon Nanotubes, β-cyclodextrin Decorated with Reduced Graphene Oxide - Gold Nanoparticle Nanocomposite

“…37 Gold nanoparticles (AuNPs) are prominent because they are greater electrocatalytic materials for electrochemical detection than diverse materials due to their large specific surface area, high conductivity, and great catalytic properties. 38 The mixture of unrivalled characteristics of graphene oxide with metal nanoparticles such as AuNPs in electrochemical sensors caused advantages including larger surface area, good conductivity, and the purveyance of fast mass transport to the binding sites, which cause more rapid and sensitive response. 14,27,[38][39][40][41] In this study, to enhance the electrical characteristics and improve the efficiency of the nanocomposite, an electrochemical sensor was fabricated successively by electropolymerization β-CD on the MWCNTs stabilized film through cyclic voltammetry (CV), and afterward, the rGO /AuNPs was immobilized on the surface and the modified electrode was employed to detect CC in presence HQ.…”

“…38 The mixture of unrivalled characteristics of graphene oxide with metal nanoparticles such as AuNPs in electrochemical sensors caused advantages including larger surface area, good conductivity, and the purveyance of fast mass transport to the binding sites, which cause more rapid and sensitive response. 14,27,[38][39][40][41] In this study, to enhance the electrical characteristics and improve the efficiency of the nanocomposite, an electrochemical sensor was fabricated successively by electropolymerization β-CD on the MWCNTs stabilized film through cyclic voltammetry (CV), and afterward, the rGO /AuNPs was immobilized on the surface and the modified electrode was employed to detect CC in presence HQ. In fact, due to combining the benefits of MWCNTs and β-CD on the one hand, and on the other with taking advantage of the synergistic cooperation of AuNPs and rGO, the efficiency of the modified electrode is increased.…”