双金属片
基质(水族馆)
蒸发
纳米颗粒
化学
检出限
纳米技术
拉曼光谱
表面增强拉曼光谱
等离子体子
化学工程
分析化学(期刊)
拉曼散射
材料科学
金属
色谱法
光电子学
光学
有机化学
海洋学
物理
工程类
热力学
地质学
作者
Rafael V. Carreón,Orlando Cortazar‐Martínez,Ana G. Rodríguez-Hernández,L. Serrano de la Rosa,José Juan Gervacio-Arciniega,Siva Kumar-Krishnan
标识
DOI:10.1021/acs.analchem.3c04442
摘要
Nanoplastic particles are emerging as an important class of environmental pollutants in the atmosphere that have adverse effects on our ecosystems and human health. While many methods have been developed to quantitatively detect nanoplastics; however, sensitive detection at low concentrations in a complex environment remains elusive. Herein, we demonstrate a greener method to fabricate a surface-enhanced Raman spectroscopy (SERS) substrate consisting of self-assembled plasmonic Ag-Au bimetallic nanoparticle (NP) films for quantitative SERS detection of nanoplastics in complex media. The self-assembly of Ag-Au bimetallic NPs was achieved through thermal evaporation onto a vapor-phase compatible ionic liquid based on deep eutectic solvent over the growth substrate. The finite-difference time-domain simulation revealed that the localized field enhancement is strong in the gaps, which generate uniform SERS "hotspots" in the obtained substrate. Benefiting from highly accessible SERS "hotspots" at the gaps, the SERS substrate exhibits excellent sensitivity for detecting crystal violet with a limit of detection (LOD) as low as 10-14 M and excellent reproducibility (RSD of 5.8%). The SERS substrate is capable of detecting PET nanoplastics with LOD as low as 1 μg/mL and about 100 μg/mL in real samples such as tap water, lake water, diluted milk, and wine. Moreover, we also validated the feasibility of the designed SERS substrate for the practical detection of PET nanoplastics collected from commercial drinking water bottles, and it showed great potential applications for sensitive detection in actual environments.
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