基于光热效应的纳米塑料捕获和SERS检测  

Capture and SERS Detection of Nano Plastics Based on Photothermal Effect

作　　者：黄向民 施慧 赵航 马君[1] 史晓凤[1] Huang Xiangmin;Shi Hui;Zhao Hang;Ma Jun;Shi Xiaofeng(Key Laboratory of Optics&Optoelectronics,Ocean University of China,Qingdao 266100,Shandong,China)

机构地区：[1]中国海洋大学青岛市光学光电子重点实验室,山东青岛266100

出　　处：《光学学报》2022年第16期186-193,共8页Acta Optica Sinica

基　　金：国家自然科学基金(41476081);山东省自然科学基金(ZR2020MF121);山东省重点研发计划(2019GHY112027);山东省自然科学青年基金(ZR2021QF047)。

摘　　要：为了解决目前水中纳米塑料颗粒难以富集和检测的问题,基于金(Au)纳米粒子和聚苯乙烯(PS)纳米粒子的混合流体,使用自搭建的光操控-显微拉曼系统实现了PS纳米粒子的光热效应捕获和检测,并研究了混合流体中PS纳米粒子的光热效应及表面增强拉曼散射(SERS)信号增强效果。结果显示,PS纳米粒子(80 nm)的运动速度受到金纳米粒子粒径和浓度的影响,随着时间的增加光热阱中会形成直径为30μm的Au-PS聚集体。PS纳米粒子的SERS信号强度在聚集体内比金溶胶基底提高了7倍,并且密度随着聚集体半径的扩展先增加后减小。该方法实现大量PS纳米粒子的光热效应捕获和SERS检测,显著提高PS纳米粒子的SERS信号强度并且降低了检测限。该方法在纳米器件自组装、环境污染监测等方面具有极大的应用潜力。In terms of the problem that polystyrene(PS)nanoparticles are hard to be aggregated and detected in water,this paper studies the mixed solution containing gold(Au)nanoparticles and PS nanoparticles,captures and detects the photothermal effect of PS nanoparticles by using a self-built optical manipulation-micro Raman system,and analyzes the photothermal effect of PS nanoparticles and the signal enhancement effect of the surface-enhanced Raman scattering(SERS)in the mixed solution.The results show that the movement speed of PS nanoparticles(80 nm)can be affected by the size and concentration of Au nanoparticles,and Au-PS aggregates with a diameter of 30μm are formed in the photothermal trap.In addition,the SERS signal intensity of PS nanoparticles in aggregates is 7 times higher than that in the solution containing only Au nanoparticles,and it increases firstly before decreasing as the radius of Au-PS aggregates increases.The proposed method can capture the photothermal effect and detect the SERS signal of PS nanoparticles,with the signal intensity significantly improved and the detection limit reduced.Therefore,it is proven to be applicable in a variety of fields such as environmental pollution detection and nanodevice self-assembly.

关 键 词：表面光学 光操控 光热效应 纳米塑料 金纳米粒子 表面增强拉曼散射 

分 类 号：O433.4[机械工程—光学工程]