该文制备了一种金银合金纳米星/聚氯乙烯柔性表面增强拉曼光谱(surface-enhanced Raman scattering, SERS)基底,该基底具有透明度高、灵活性强和SERS增强性能显著的优点,可以快速实现对果蔬表面毒死蜱残留的定性和定量检测。在复合基底制备中,首先优化聚氯乙烯(polyvinyl chloride, PVC)添加量获得柔性良好的PVC基底,并优化氯金酸/硝酸银体积比制备了形貌鲜明且SERS增强效应显著的各向异性金银合金纳米星(gold-silver alloy nanostars, Au@Ag NSs),其次以拉曼信号分子4-巯基苯甲酸为对象,通过拉曼光谱仪测定其在复合基底上的SERS强度,确定了Au@Ag NSs溶液的最优浓缩倍数,进一步验证了基底的良好SERS效应、重现性和稳定性,最后成功应用于苹果表皮毒死蜱残留的检测。
A gold-silver alloy nanostars/polyvinyl chloride flexible surface-enhanced Raman scattering (SERS) substrate was fabricated, which has the advantages of high transparency, strong flexibility, and remarkable SERS enhancement performance.During the fabrication process of composite substrate, the addition amount of polyvinyl chloride (PVC) was optimized to obtain a flexible PVC substrate first.Meanwhile, the volume ratio of chloroauric acid/silver nitrate was optimized to prepare the anisotropic gold-silver alloy nanostars (Au@Ag NSs) with distinctive shape and significant SERS enhanced effect.Then, 4-mercaptobenzoic acid, a Raman signal molecule, was detected by Raman spectrometer to determine its SERS intensity on the composite substrate, and the optimal concentration of the Au@Ag NSs solution was determined, which further verified the good SERS effect, reproducibility, and stability of the substrate.Finally, it was successfully applied to the detection of chlorpyrifos residue on apple surface.
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