▎ 摘　　要

In this study, we have prepared a novel carbon nanocomposite paste electrode modified with tetra aniline/ graphene oxide/gold nanoparticle (tetra aniline (TA)/GO/AuNP) composites. The electrode was applied for the electrochemical sensing of ascorbic acid (AA). TA was synthesized using the oxidation coupling method from n-phenyl-p-phenylenediamine, and its structure was characterized using liquid chromatography-mass spectrometry and Fourier transform infrared spectroscopy. TA/graphene oxide (GO) composites were prepared using their unique pi-pi interaction. Furthermore, AuNPs were captured with an amino group on the TA/GO composites to form ternary composites. The topography of the ternary composites was confirmed via scanning electron microscopy-energy dispersive spectroscopy and transmission electron microscopy. To observe the sensing properties of the composites, several electrochemical analyses were used. In cyclic voltammetry studies, TA/GO/ AuNP composites exhibited a higher current response than the TA/GO nanocomposite. This result showed that ternary composites might accelerate the direct electron transfer between AA and the electrode. The detection sensitivities of the TA/GO- and TA/GO/AuNP-modified carbon paste electrodes (CPEs) were 8.73 and 19.30 mu A.mM(-1), respectively; there is a significant increase with the addition of AuNPs. These results confirm that the addition of nanometer-scale components affects the electrocatalytic activity.