▎ 摘　　要

We have synthesized functionalized graphene by using direct dispersion of graphite flakes with single-stranded DNA in distilled water. The synthesized graphene-DNA complexes were investigated by using Raman spectroscopy, atomic force microscopy (AFM), transmission electron microscopy (TEM), and time-of-flight secondary-ion mass spectroscopy (TOF-SIMS). Raman spectra exhibited typical G-band and 2D-band signatures of graphene at similar to 1590 cm(-1) and similar to 2700 cm(-1), respectively. TOF-SIMS result showed that the graphene layers were successfully functionalized with singlestranded DNA. Mono-layer and few-layer graphene were identified by measuring the layer thickness by using AFM and by analyzing the electron diffraction patterns from TEM measurements.