School of Electrical Engineering, Chongqing University, Chongqing 400044, PR China; State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing 400044, PR China.
School of Electrical Engineering, Chongqing University, Chongqing 400044, PR China.
Spectrochim Acta A Mol Biomol Spectrosc. 2022 May 15;273:121067. doi: 10.1016/j.saa.2022.121067. Epub 2022 Feb 22.
Accurately evaluating the aging state of oil paper insulation in electrical equipment is a key to ensure the safe operation of the power transformer. For achieving highly sensitive in-situ detection of dissolved furfural in transformer oil with good reproducibility, flower-like silver nanoparticles modified with carbon nanotubes (CNTs@Ag-F-AgNPs) was synthesized by a combination of electroless silver plating and redox method. The large specific surface area and strong adsorption capacity of CNTs@Ag promoted the formation of more "hot spots". CNTs@Ag-F-AgNPs were adsorbed on Si-Au substrate via mercapto groups on the coupling agent 1'4 phenyldimercaptan molecule (BDT). Using rhodamine 6G (R6G) as probe molecule, the enhanced factor reached 6.96 × 10. Then, the substrate was used for in-situ SERS detection of transformer oil-dissolved furfural at different concentrations and the detection limit was 2.25 mg/L at 1703 cm (Stretching vibration of C = O in furfural molecule), fulfilling requirements of furfural content detection after severe aging of transformer (4 mg/L). Besides, the relative standard deviation (RSD) of characteristic peak intensity at ten different positions was only 1.74%. These results exhibite that three-dimensional nanostructure with high sensitivity and good reproducibility exhibited a wide application range for in situ detection of dissolved trace furfural in transformer oil.
准确评估电气设备油纸绝缘的老化状态是确保电力变压器安全运行的关键。为了实现对变压器油中溶解糠醛的高灵敏度原位检测，具有良好重现性，通过化学镀银和氧化还原法合成了具有碳纳米管（CNTs@Ag-F-AgNPs）修饰的花状银纳米粒子。CNTs@Ag-F-AgNPs 通过偶联剂 1'4 苯二巯基分子（BDT）上的巯基基团被吸附在 Si-Au 基底上。用罗丹明 6G（R6G）作为探针分子，增强因子达到 6.96×10。然后，将基底用于不同浓度的变压器油中溶解糠醛的原位 SERS 检测，在 1703cm 处的检测限为 2.25mg/L（糠醛分子中 C=O 的伸缩振动），满足了变压器严重老化后（4mg/L）糠醛含量检测的要求。此外，十个不同位置特征峰强度的相对标准偏差（RSD）仅为 1.74%。这些结果表明，具有高灵敏度和良好重现性的三维纳米结构在变压器油中溶解痕量糠醛的原位检测中具有广泛的应用范围。
