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Furfural analysis in transformer oil using silver nano-branch surface-enhanced Raman spectroscopy

To evaluate the thermal degradation of oil-paper insulation, analyzing the furfural dissolved in transformer oil is determined as an important method. Surface enhanced Raman spectroscopy (SERS) is used to detect the concentration of furfural, which not only overcomes the shortcomings of the traditional detection methods, but also realizes nondestructive testing. In this paper, SERS for detecting the furfural in transformer oil was investigated. we used Electrochemical displacement to synthesize the two-dimensional Ag Nano-branch on copper foil, and then applied for measuring oil samples with different furfural concentrations by SERS. The SERS signal of furfural was used for qualitative and quantitative analysis at ∼931 cm−1, and the mathematical model was constructed, depending on the Raman peak intensity ratios Ι931/Ι770 and furfural concentrations, basing on the least squares method. As a result, without complex preprocessing steps, SERS can detect the transformer oil's furfural concentration quantitatively. Therefore, it proposes a new method to detect furfural concentration in transformer oil with fast in-situ capability.