Cu-Gr@MOS2@AgNPs intercalation structure for SERS Detection of Transformer Oil-dissolved Furfural

Oil-immersed power transformer is the core equipme nt in the transmission network. Accurate evaluation of its oil-pape r insulation aging degree is the key factor to ensure the normal op eration of transformer. In-situ detection of furfural in transforme r oil is one of the methods to detect the aging degree of transforme r. Cu-Gr@MOS2@AgNPs were prepared by electroless silver plating on copper foil. Two-dimensional layered molybdenum sulphid e and graphene have large specific surface area, and granular silv er nanoparticles adsorbed on layered molybdenum sulphide provi de a large number of Raman hotspots. Using Rhodamine 6G (R6G) as the probe molecule, it was found that the enhancement factor c an reach
$\mathbf{4}.\mathbf{94}\times \mathbf{10}^{\mathbf{9}}$
with this SERS (Surface-Enhanced Raman Sca ttering) substrate. The results show that the detection limit of furf ural is 9 mg/L when the characteristic peak of furfural is located a t 1703 cm
⁻¹
, the relative standard deviation (RSD) of characteristic peak strength at ten different points is 7.57%. It shows that the ba se has good stability and consistency, which provides a new idea fo r in-situ detection of oil immersed transformer aging.