Development of a rapid responsive conductive electrochemical sensor for sensitive hydrogen detection: Chitosan-based GO/Fe3O4/PANi hydrogel nanocomposite

Abstract

Hydrogen sensing is critical in various industries, including energy, chemical processing, and environmental monitoring, due to hydrogen's widespread use and the potential hazards associated with leaks. The present study presents the synthesis of a chitosan-based GO/Fe 3 O 4 hydrogel using free radical polymerization, followed by the in situ oxidative polymerization of polyaniline in its emeraldine form within the monomer backbone, resulting in the chitosan-based GO/Fe 3 O 4 /PANi hydrogel nanocomposite. The integration of the superior response characteristics of Cs/GO/Fe 3 O 4 hydrogel and PANi, together with the exceptional electrical conductivity, allows the development of Cs/GO/Fe 3 O 4 /PANi hybrid nanocomposites by in situ chemical polymerization for use as a hydrogen gas sensor. A variety of methods, including FTIR, XRD, TGA, UV, SEM, EIS, and CA, were used to assess carrier charge mobilities and hydrogen detection. The findings indicated that the chitosan-based GO/Fe 3 O 4 /PANi hydrogel nanocomposite was effectively produced and evenly applied to the surface of the polymeric hydrogel networks. The hydrogen gas-detecting capabilities of the sensor developed in this study were examined, revealing a sensitivity of 16.64 μA M and detection limits of 3.58 μ.M, with response and recovery periods of 0.3 and 0.6 s, respectively, in an alkaline medium. With the super properties the sensor shown, it illustrates that it PANi irregular structures, iron oxide electron hopping character, and π-π stacking interaction of graphene oxide are the once that influenced these excellent properties. • Cs/GO/Fe 3 O 4 /PANi HNCs was formed via free radical then in situ polymerization. • Cs/GO/Fe3O4/PANi HNCs has enhanced responsiveness and electrical conductivity. • The sensor had a sensitivity of 16.64 μA M and detection limits of 3.58 μ.M. • The best response and recovery times of the sensor were 0.3 and 0.6 s, respectively.