In this paper, a hydrophobic substrate as concentrators including an inner layer of polytetrafluoroethylene (PTFE) and an outer layer covered a thin layer of perfluoropolyether (PFPE) was constructed to achieve a higher sensitivity for acetamiprid (AC) SERS detection. The condensation effect of the PTFE-PFPE hydrophobic substrate-induced aggregation of gold nanoparticles (Au NPs) result ‘‘hot spots’’ for SERS. The hydrophobic substrate is better reproducibility (RSD < 5%) compared with that on a conventional silicon wafer. A further application of the hydrophobic substrate was demonstrated by the detection of AC in tea samples within a detection range of 0.03 mg/L to 3 mg/L. The hydrophobic substrate eliminates the problem of solution diffusion to avoid the “coffee ring” effect (When a droplet adheres to a solid surface, the suspended molecular particles usually deposit on the edge of the droplet to form a ring).

在本文中，构建了一种疏水基底作为浓缩剂，包括聚四氟乙烯 (PTFE) 内层和覆盖全氟聚醚 (PFP​​E) 薄层的外层，以实现对啶虫脒 (AC) SERS 检测的更高灵敏度。PTFE-PFPE 疏水性基质诱导的金纳米粒子 (Au NP) 聚集的凝聚效应导致 SERS 的“热点”。与传统的硅晶片相比，疏水基板具有更好的重现性 (RSD < 5%)。通过在 0.03 mg/L 至 3 mg/L 的检测范围内检测茶样品中的 AC，证明了疏水性底物的进一步应用。疏水基材消除了溶液扩散的问题，避免了“咖啡环”效应（当液滴附着在固体表面时，