▎ 摘　　要

A highly sensitive electrochemical sensor for detecting indole-3-acetic acid (IAA) was constructed based on the composite of poly(N-methyl-3,4-dihydrothieno[3,4-b][1,4]oxazine) (PMDTO) and reduced graphene oxide (RGO) (PMDTO/RGO). The PMDTO/RGO modified electrode was prepared by electrochemical polymerization of MDTO followed by the electrochemical reduction GO in their homogeneous aqueous solution. SEM demonstrated that PMDTO was covered with plate-like graphene through the two-step electrodeposition. The RGO, featuring large surface area and excellent conductivity, could not only improve the conductivity of the sensor, but also load more PMDTO to amplify the signal. The fabricated electrochemical sensor showed a low detection limit of 3x10(-8) M and a wide linear range from 0.1 to 10 mu M for the recognition of IAA.