▎ 摘　　要

Three dimensional graphene-multiwalled carbon nanotube nano composite (3DG/MWCNTs-Nc) was synthesized by simple hydrothermal method for the amperometric determination of caffeic acid (CA). The prepared nanocomposite was characterized by scanning electron microscopic technique (SEM), ultraviolet-visible spectroscopy (UV), Raman spectroscopy and infrared spectroscopy (IR). Moreover, the interfacial electron transfer properties of the modified electrode were carried out by the electro chemical impedance spectroscopy (EIS). Besides, the electro chemical performance of the modified electrode was carried out by the cyclic voltammetry (CV) and amperometric (i-t) technique. The proposed electrode was exhibited an enhanced electrocatalytic activity towards the detection of CA. Under the optimal condition, the 3DG/MWCNTs-Nc modified electrode displayed a linear range from 0.2 to 174 M, detection limit (LOD) 17.8 nM and sensitivity of 5.8308 A M-1 cm(-2) and on applied potential + 0.2V. These result showed, 3DG/MWCNTs-Nc modified electrodes showed good repeatability, reproducibility, and higher stability. In addition, the fabricated electrode was then successfully used to determine the CA in real samples with satisfactory recoveries. Which suggests that the 3DG/MWCNTs-Nc as a robust sensing materials for the electrochemical detection of CA.