Hierarchical layered double NiCo oxide/core-shell arrays structure functionalization with Au nanoparticles for highly sensitive hydrazine determination

A highly sensitive gold nanoparticles (AuNPs) functionalized hierarchical layered NiCo 2 O 4 nanosheets/NiCo 2 O 4 nanowires (NCSs/NCWs) core–shell structures is proposed toward hydrazine detection using hydrothermal and electrodeposition methods. Various techniques were used to investigate the morphology, crystalline structure and chemical compositions of as-synthesized AuNPs@NCSs/NCWSs sample. The electrochemical performances of the as-prepared hydrazine sensors were evaluated by optimization different experimental parameters including growth time of nanowire and electrodeposition time of AuNPs. The as-proposed AuNPs-180@NCSs/NCWSs hydrazine sensor exhibits excellent electrochemical properties to hydrazine detection, including high sensitivity (14.36 μA·μM −1 ·cm −2 ), good linear range (0.8–499.8 μM), low detection limit (0.23 μM) and superior performance for real sample determine, which can be ascribed to the synergistic effects between the NiCo 2 O 4 nanosheets/NiCo 2 O 4 nanowires core–shell arrayed structures and AuNPs. Therefore, the as-synthesized hierarchical layered double NiCo oxide/core–shell nanostructure is a promising candidate for the highly sensitive sensing material of the electrochemical sensor.