Hydrothermally prepared α-MnO₂/N-rGO composite modified electrode for hydrazine sensing application

In the present study, the hydrothermal method has been used for the synthesis of a manganese dioxide/nitrogen-doped reduced graphene oxide (α-MnO₂/N-rGO) composite. The physical–chemical properties of the synthesized α-MnO₂/N-rGO were examined by different techniques such as powder X-ray diffractometer (XRD), energy dispersive X-ray analysis (EDX), and scanning electron microscopy (SEM). The synthesized α-MnO₂/N-rGO was further used as the catalyst towards the fabrication of a hydrazine (Hz) sensor. The screen-printed carbon (SPC) electrode was modified with α-MnO₂/N-rGO via the drop-cast method. Linear sweep voltammetry (LSV) was used for the determination of Hz, and observations showed that the α-MnO₂/N-rGO/SPC electrode has decent performance in terms of sensitivity, detection limit, and selectivity. The detection limit of 0.08 µM and sensitivity of 2.47 µA/µM.cm² were obtained using this modified electrode.