Study on the synthesis and surface enhanced Raman spectroscopy of graphene-based nanocomposites decorated with noble metal nanoparticles

- Ag@Au-G hybrids have been synthesized by controlling the ratio of HAuCl4 to AgNO3.
- The structure of Ag@Au-G has stronger SERS activity than that of Au-G and Ag-G.
- When the ratio reduces, the SERS activity enhances firstly, and then weakens.