Mohammad Mazloum-Ardakani - Department of Chemistry, Faculty of Science, Yazd University, Yazd, Iran
Hamed Arabi - Department of Chemistry, Faculty of Science, Yazd University, Yazd, Iran
Zahra Alizadeh - Department of Chemistry, Faculty of Science, Yazd University, Yazd, Iran
Mahnoosh Haghshenas - Department of Chemistry, Faculty of Science, Yazd University, Yazd, Iran
Fatemeh Farbod - Department of Chemistry, Faculty of Science, Yazd University, Yazd, Iran
Sahar Saadat HosseiniKhah - Department of Chemistry, Faculty of Science, Yazd University, Yazd, Iran
Bibifatemeh Mirjalili - Department of Chemistry, Faculty of Science, Yazd University, Yazd, Iran

In this research, a novel modified glassy carbon electrode (GCE) was successfully fabricated with a tri-component nanocomposite consisting of ۵-(۳,۴-dihydroxyphenyl)۸,۸-dimethyl-۲-(methyl thio)-۷,۸,۹,۱۰-tetrahydropyrimido [۴,۵-b]quinolone-۴,۶(۳H,۵H)-dione (PQ۲۳) and Nitrogen-doped reduced graphene oxide aerogel/molybdenum oxide nanorods (PQ۲۳/N-doped-rGO/MoO۲ /GCE) as sensing platform toward hydrazine (HDZ). The nanocomposite is characterized by MAP analysis, X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDS). Through electrochemical investigations, the electron transfer coefficient between PQ۲۳ and the N-doped-rGO/MoO۲ /GCE (glassy carbon electrode which was modified with reduce graphene oxide decorated by molybdenum oxide nanorods) and the apparent charge transfer rate constant, ks, and diffusion coefficient (D) were calculated. Electrochemical behavior and electrocatalytic activity of the nanocomposite modified GCE were studied by electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), and differential pulse voltammetry (DPV). Under the optimum experimental condition, the designed sensor exhibited high sensitivity and suitable selectivity for hydrazine oxidation, enabling the detection of hydrazine with a linear range of ۲۵.۰-۱۰۰۰.۰ µM and a good detection limit (۳σ) was ۴.۲ µM. The designed electrochemical sensor shows good repeatability, reproducibility, and acceptable stability with an RSD less than ۳.۲%.

electrochemical sensor, Graphene Aerogels, Nitrogen-Doped Aerogels, MoO۲, Hydrazine