▎ 摘　　要

Stable non-covalent functionalization DNA/graphene assemblies are successfully fabricated via a facile sonication approach. The obtained assemblies are characterized by transmission electron microscopy, atomic force microscopy and Raman spectroscopy. Experimental results indicate that graphene aggregates are separated into few-layers structures by DNA segments and exhibit excellent dispersibility in aqueous solution due to the introduction of DNA. The strong interaction between the backbones of DNA and the surface of graphene is attributed to the pi-pi interaction or hydrogen bonding. Moreover, cyclic voltammograms show that the DNA/graphene assemblies exhibit good electrochemical response, especially with 0.5 wt% DNA, with the maximum current approaching to 2.2 mA. The better electrochemical performance is ascribed to the synergetic effect of excellent electronic properties of graphene and excellent dispersibility in aqueous solution due to the efficient bonding of DNA segments on surface of graphene. The stable DNA/graphene assemblies hold potential for future applications in biosensing and biomedical engineering.