▎ 摘　　要

This study aimed at preparing and evaluating the europium oxide-reduced graphene oxide (rGO) composites. Inorganic nanoparticles anchored onto rGO sheets through a facile sonochemical method. The resultant products were characterized by FT-IR, XRD, SEM. Their activity in biomolecules' analysis were examined by cyclic voltammetry. The rectified electrodes revealed an incredibly electroactive manner. The obtained progress provided excellent materials for scrutiny of biomolecules. The linear relationship was used in the region of 100-1500 mu M ascorbic acid (AA), 50-600 mu M dopamine (DA), and 10-700 mu M uric acid (UA), between current intensities and concentrations. The detection restrictions (LOD) (S/N=3) decreased to 8 mu M, 1.1 mu M and 0.085 mu M for AA, DA and UA respectively by differential pulse voltammetry (DPV).