Oil-immersed power transformer is the core equipment in the transmission network. Accurate evaluation of its oil-paper insulation aging degree is the key factor to ensure the normal operation of transformer. In-situ detection of furfural in transformer oil is one of the methods to detect the aging degree of transformer. Cu-Gr@MOS2@AgNPs were prepared by electroless silver plating on copper foil. Two-dimensional layered molybdenum sulphide and graphene have large specific surface area, and granular silver nanoparticles adsorbed on layered molybdenum sulphide provide a large number of Raman hotspots. Using Rhodamine 6G (R6G) as the probe molecule, it was found that the enhancement factor can reach 4.94 × 109 with this SERS (Surface-Enhanced Raman Scattering) substrate. The results show that the detection limit of furfural is 9 mg/L when the characteristic peak of furfural is located at 1703 cm-1, the relative standard deviation (RSD) of characteristic peak strength at ten different points is 7.57%.It shows that the base has good stability and consistency, which provides a new idea for in-situ detection of oil immersed transformer aging.

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