Fabrication and characterization of enhanced hydrazine electrochemical sensor based on gold nanoparticles decorated on the vanadium oxide, ruthenium oxide nanomaterials, and carbon nanotubes composites

This work describes the synthesis of mixed oxide film of vanadium and ruthenium by pulsed deposition technique on multiwall carbon nanotubes and the decoration of gold nanoparticles on the mixed film. A ternary electrocatalyst has been developed for the electrochemical oxidation of hydrazine by combining two metal oxide mixtures with Au nanoparticles. Surface morphology and chemical composition of the electrode have been examined with SEM, EDX, HRTEM, EIS, and XRD. The peak current of hydrazine increased 9 times at the AuNPs/(VOx-RuOx)/CNT/GCE compared to the bare GCE, and the peak potential shifted to negative 848 mV. Linear sweep voltammetry (LSV) and amperometric techniques revealed that the AuNPs/(VOx-RuOx)/CNT/GCE displays linear concentration range 2.5-10000 mu M (LSV) and the concentration range 0.03-100 mu M (amperometry). The limit of detection (LOD) is 0.5 mu M and 0.1 mu M at (S/N = 3) for LSV and amperometric technique, respectively. The results obtained show a good RSD% of 2.1%-3.2% and reasonable recovery of 97%-108% of hydrazine detection.

Automated summary

A mixed oxide film of vanadium and ruthenium was synthesized on multiwall carbon nanotubes, decorated with gold nanoparticles, and used as a ternary electrocatalyst for the electrochemical oxidation of hydrazine. The developed electrode showed significantly enhanced peak current and a negative shift in peak potential compared to the bare electrode. The AuNPs/(VOx-RuOx)/CNT/GCE exhibited good detection performance and recovery for hydrazine.