▎ 摘　　要

In this work, we proposed a novel liquid-liquid interface polymerization method for preparing of PANI/GN nanocomposites. The interface polymerization method can effectively suppress secondary growth. This method was benefit for growing PANI onto GN surface uniformly. Then an electrochemical sensor for the determination of DA, AA, and UA was fabricated on glassy carbon electrode (GCE) modified with the obtained PANI/GN nanocomposites. Cyclic voltammetry (CV) and amperometric i-t curve were performed to investigate the electrochemical behaviour of DA, AA, and UA. The results indicated the PANI/GN-modified electrode had a good electrochemical response toward AA, AD, and UA in the concentrations range between 0.167 mu M to 600 mu M, 0.0557 mu M to 530 mu M, 1.500 mu M to 890 mu M, respectively. And the corresponding detection limit for AA, DA, and UA were 0.053 mu M, 0.019 mu M, and 0.57 mu M, respectively. Good detection limit of 0.053 mu M, 0.019 mu M, and 0.57 mu M were achieved for determination of AA, AD, and UA, respectively.