▎ 摘　　要

A dispersible large-sized graphene quanturr dots assemblies (LSGQD-NAs) in aqueous solution with strong electrochemiluminescence activity was fabricated from graphene oxide by nitric acid etching. LSGQD-1NAs were characterized by transmission electron microscopy (TEM), atomic force microscopy (AFM), Fourier transform infrared spectroscopy (FTIR) and Raman spectroscopy (Raman), etc. The results demonstrated that the large-sized graphene quantum dots had an average height of 20 nm and contained abundant carboxyl and hydroxyl groups. Strong ECL was studied in detail with the coreaction of K2S2O8 and the maximum emission wavelength at 685 urn. It is :found that LSGQD-NAs can be easily assembled and modified on the surface of GC electrode through the pi-pi-bond action of unoxidized graphene. This study provides a new method for the research of ECL sensor based on graphene quantum dots.