Abstract：
Microplastics (MPs) and Nanoplastics (NPs) accumulated in the environment have been identified as a major global issue due to their potential harm to wildlife. Current research in the detection of MPs is well established. However, the detection of NPs remains challenging. The aim of this paper is to investigate the detection of polystyrene (PS) NPs on a super-hydrophobic substrate using surface-enhanced Raman spectroscopy (SERS) technology after high-speed centrifugation of PS NPs and AgNPs. The hydrophobic substrate reduces the contact area of droplet, concentrating PS NPs and AgNPs on a small spot, which eliminates the random distribution of nano particles. The condensed PS NPs and AgNPs improve the SERS intensity, reproductivity and detection sensitivity. The results show that SERS measurement on a hydrophobic substrate could significantly improve the detection sensitivity of PS NPs, with the detection limits of PS NPs as low as 0.5 mg/L (500 nm PS NPs) and 1 mg/L (100 nm PS NPs). The study provides an effective and rapid method for the detection of NPs at trace concentration, demonstrating more possibility for the future detection of trace NPs in the aquatic environment.
摘要：
由于环境中积累的微塑料（MPs）和纳米塑料（NPs）对野生动植物的潜在危害，已被确定为主要的全球问题。目前对MPs检测的研究已经建立。然而,NPs的检测仍然具有挑战性。本文的目的是研究高速离心PSNP和AgNP后，使用表面增强拉曼光谱（SERS）技术在超疏水基底上检测聚苯乙烯（PS）NP。疏水性基质减少了液滴的接触面积，将PSNPs和AgNPs集中在一个小地方，这消除了纳米颗粒的随机分布。浓缩的PSNP和AgNP提高了SERS强度，繁殖和检测灵敏度。结果表明，在疏水性基底上进行SERS测量可以显着提高PSNPs的检测灵敏度，PSNP的检测限低至0.5mg/L（500nmPSNP）和1mg/L（100nmPSNP）。该研究为痕量NPs的快速检测提供了一种有效的方法,证明了将来在水生环境中检测痕量NP的可能性更大。
