Surface-enhanced Raman scattering of gold/graphene oxide composite materials fabricated by interface self-assembling

The colloidal gold nanoparticles (AuNP) are synthesized by the classic Frens' method, and the sandwich-structured AuNP/graphene oxide/AuNP (AuNP/GO/AuNP) composite materials are constructed on the phosphorus doped diamond-like carbon film by the interface self-assembling. The surface enhanced Raman scattering behaviors of the AuNP/GO/AuNP composites are investigated by using the rhodamine B (RhB) as the probe molecules. Our results indicate that the Raman intensity of RhB obtained from the AuNP/GO/AuNP composites shows a 16.5-fold increase over that from the AuNP monolayer due to the coupled effect of chemical enhancement of GO and localized electromagnetic field enhancement of plasmonic gold. The designed composite materials with metal/GO/metal sandwich configuration exhibit great potential applications in biochemical analysis, environmental monitoring, disease controlling, and food safety.