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A super-hydrophobic perfluoropolyether coated polytetrafluoroethylene sheets substrate for detection of acetamiprid surface-enhanced Raman spectroscopy
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy ( IF 4.3 ) Pub Date : 2022-05-11 , DOI: 10.1016/j.saa.2022.121373
Yi Gu 1 , Qiulan Li 1 , Mengjia Yin 2 , Dezhi Yang 1 , Yaling Yang 1
Affiliation  

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).



中文翻译:

用于检测啶虫脒表面增强拉曼光谱的超疏水全氟聚醚涂层聚四氟乙烯片基材

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,

更新日期:2022-05-13
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