▎ 摘　　要

Choline chloride based ionic liquid Ethaline were employed as the supporting electrolyte, graphene (GE) nanosheet was prepared with ultrasonic wave assisted electrodeposition for the first time. Scanning electron microscope results indicated that flower-like GE nanosheets were obtained at the electrode surface. Energy dispersive X ray spectroscopy, Fourier transform infrared spectra and Raman spectra were used to characterize the composition of the flower-like GE nanosheets. Electrochemical methods showed that the flower-like GE nanosheets based sensor exhibited high electrocatalytic activity for ascorbic acid (AA) oxidation and can be potentially used for the sensitive amperometric sensing of AA. Amperometric experiments showed that the sensor displayed broad linearity from 0.25 mu M to 2.0 mM with a relative low detection limit-of 0.1 mu M (S/N = 3).