Fabrication of a sensitive electrochemical sensor based on modified screen printed electrode for hydrazine analysis in water samples

ABSTRACT

One of the new electrochemical sensors to detect (N₂H₄) has been constructed on the basis of the screen printed electrode (SPE) modified with poly(vinyl alcohol)/chitosan/TiO₂/chlorophyll nanocomposite VA/Chi/TiO₂/Chlo/SPE). Therefore, PVA/Chi/TiO₂/Chlo nanocomposite has been procured and numerous procedures like energy-dispersive X-ray (EDS), Fourier transform infrared spectroscopy (FT-IR), field-emission scanning electron microscopy (FE-SEM) as well as X-ray diffraction (XRD) have been utilised for examining the nanocomposite structure and morphology. In comparison with the unmodified SPE, PVA/Chi/TiO₂/Chlo/SPE could notably ameliorate electrooxidation of N₂H₄ via declining oxidation overpotential and augmenting the oxidation peak current. Moreover, differential pulse voltammetry (DPV) has been employed for quantitatively analysing N₂H₄. In addition, anodic peak current has been linear to N₂H₄ concentration in range between 0.045 and 350.0 µM with the limit of detection (LOD) 0.015 µM. In addition, acceptable stability, reproducibility, and sensitivity of the modified electrode have been observed. Furthermore, results indicated functionality of the sensor has been reliable to determine N₂H₄ in various water samples.

Graphical Abstract

KEYWORDS:

• Differential pulse voltammetry
• electrochemical sensor
• hydrazine
• screen printed electrode
• poly(vinyl alcohol)/chitosan/TiO₂/chlorophyll nanocomposite

Disclosure statement

No potential conflict of interest was reported by the author(s).