Electrochemical determination of dopamine based on electrospun CeO2/Au composite nanofibers

An electrochemical method for the detection of dopamine based on a glass carbon electrode modified with electrospun CeO 2 /Au composite nanofibers was investigated in this article. The CeO 2 /Au composite nanofibers were prepared by the electrospinning technique and then annealed in air. The CeO 2 /Au composite nanofibers were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) measurements. Cyclic voltammetry (CV) showed that the electrospun CeO 2 /Au composite nanofibers modified carbon glass electrode exhibited an excellent electrocatalytic response to the dopamine (DA). The detection limit (S/N   =   3) was as low as 0.056   μM and the sensitivity could reach 127   μA   mM −1   cm −2 . All these demonstrated that the electrospun CeO 2 /Au composite nanofibers were good electrocatalyst for the oxidation of dopamine.