▎ 摘　　要

beta-cyclodextrin (beta-CD) functionalized silver nanoparticles (AgNPs) and reduced graphene oxide (RGO) via one step electrochemical potentiodyanamic method has been prepared. Scanning electron microscopy, Energy-Dispersive X-ray spectroscopy, electrochemical impedance spectroscopy and cyclic voltammetry were used to study the role of beta-CD on preparation of AgNPs and RGO. RGO/beta-CD/AgNPs modified GCE showed good electrochemical activity towards electro-oxidation of hydrazine in terms of decreasing the over potential and increasing the peak current. The kinetic parameters such as electron transfer coefficient (a) and diffusion coefficient (Do) of the modified electrode towards hydrazine were determined to be 0.66 and 0.97 x 10(-6) cm(2) s(-1), respectively. The LOD of our sensor was many folds lower than that of recommended concentration of hydrazine in drinking water by United States Environmental Protection Agency and World Health Organization. The sensor exhibited a wide linear range from 0.08 to 1110 mM and a very low detection limit (LOD) of 1.4 nM. In addition, the sensor selectively determined hydrazine even in the presence of common interferents.