The morphology effect of cerium oxide (CeO2) has always been the focus of catalysis research. Few people have reported the relationship between the morphology of CeO2 and electrochemical performance in sensors. In this paper, a polyaniline (PANI) matrix is used as the dispersant and stabilizer, ultrafine Au nanoparticles (NPs) (Au@PANI) are uniformly embedded in the PANI matrix, and Au NPs@PANI is fixed on the surface of CeO2 with different morphologies and sizes (Spindle CeO2:(SCe), octahedron CeO2 (OCe)). The morphology and crystal structure of CeO2 were adjusted under different ratios of ethanol and water, and the effect of CeO2 was evaluated. The synthesized CeO2-Au@PANI has different morphologies, sizes, and electrochemical properties. The electrochemical catalytic behavior of CeO2-Au@PANI was studied by using hydrogen peroxide (H2O2) as the reaction substrate. The instantaneous current method (I-T) was used to further study the electrochemical amplification effect, and the best performance was obtained.
Keywords: CEA; S (O)Ce; immunosensor; topography control.