▎ 摘　　要

The copper phthalocyanine and 2,3,5,6-tetrafluoro-tetracyano-quino-dimethane molecules adsorbed on the copper and single-layer graphene-modified copper surfaces have been investigated using Raman and X-ray photoelectron spectroscopy. The adsorbed amounts for both molecules on the two different substrates are almost comparable as confirmed by the C 1s and N 1s core level X-ray photoelectron spectra. Raman signal enhancement has been observed for both molecules when they are adsorbed on the graphene surface. The strongest chemical interaction is observed between the 2,3,5,6-tetrafluoro-tetracyano-quino-dimethane and copper substrate. Based on the Raman and X-ray photoelectron spectroscopic data, the mechanism of the graphene-enhanced Raman scattering is discussed, which might greatly rely on the unique electronic properties of graphene.