▎ 摘　　要

NOVELTY - Preparing plasmon composite structure substrate combined with silver fractal and graphene involves preparing silver fractal structure on one side of the preset substrate by electrochemical deposition method, using the wet chemical transfer method to transfer the single-layer graphene to one side of the silver fractal of the preset substrate. The preset substrate is set in the preset probe molecule solution, the preset probe molecule is deposited on the surface of the preset substrate. USE - Method for preparing plasmon composite structure substrate combined with silver fractal and graphene used for physical, chemical detection, biological sensing medicine and single molecule detection and molecular specific fingerprint identification. ADVANTAGE - The silver fractal nanostructure has rich hot and self-similarity of the hot spot, which can effectively increase the Raman signal of the substrate surface probe molecule, thus greatly enhancing the effect of the raman signal, and the application preparation process is simple. The prepared composite structure substrate has higher surface enhanced Raman scattering activity.