Enhancement in analytical hydrazine based on gold nanoparticles deposited on ZnO-MWCNTs films

A good route (electrodeposition) for the fabrication of gold nanoparticles (nano-Au) attached on ZnO-MWCNTs films modified glassy carbon electrodes (GCE) was proposed. ZnO-MWCNTs films are favored for functioning as the biomimic membrane to immobilize nano-Au. The morphological characterization of nano-Au/ZnO-MWCNTs was examined by scanning electron microscopy (SEM). The performances of the nano-Au/ZnO-MWCNTs/GCE were characterized with cyclic voltammetry (CV), Nyquist plot (EIS) and typical amperometric response (i–t). The potential utility of electrodes constructed was demonstrated by applying them to the analytical determination of hydrazine concentration. The catalytic oxidation of hydrazine has a better result on the nano-Au/ZnO-MWCNTs/GCE because of the synergistic effect of nano-Au and ZnO-MWCNTs films. An optimized limit of detection of 0.15 μM was obtained at a signal to noise ratio of 3 and with a fast response time (within 3 s). Additionally, the nano-Au/ZnO-MWCNTs/GCE exhibited a wide linear range from 0.5 to 1800 μM and higher sensitivity. The ease of fabrication and high stability of the modified electrode are the promising features of the proposed sensor.