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Ratiometric Sensing of Polycyclic Aromatic Hydrocarbons Using Capturing Ligand Functionalized Mesoporous Au Nanoparticles as a Surface-Enhanced Raman Scattering Substrate.
Langmuir ( IF 3.7 ) Pub Date : 2020-09-02 , DOI: 10.1021/acs.langmuir.0c02271 Dongjie Zhang 1 , Rui Hao 1 , Lingling Zhang 1 , Hongjun You 2 , Jixiang Fang 1
Langmuir ( IF 3.7 ) Pub Date : 2020-09-02 , DOI: 10.1021/acs.langmuir.0c02271 Dongjie Zhang 1 , Rui Hao 1 , Lingling Zhang 1 , Hongjun You 2 , Jixiang Fang 1
Affiliation
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The absorption behavior between plasmonic nanostructures and a target molecule plays key roles in effective surface-enhanced Raman scattering (SERS) detection. However, for analytes with low surface affinity to the metallic surface, e.g., polycyclic aromatic hydrocarbons (PAHs), it remains challenging to observe the enhanced Raman signal. In this work, we reported a ratiometric SERS strategy for sensitive PAH detection through the surface functionalization of 3D ordered mesoporous Au nanoparticles (meso-Au NPs). By employing mono-6-thio-β-cyclodextrin (HS-β-CD) as capture ligands, the hydrophobic molecules, e.g., anthracene, could be effectively absorbed on the meso-Au NP surface via a host–guest interaction. Besides, a hydrophobic slippery surface is used as a concentrator to deliver and enrich the Au/analyte droplets into a small area. Consequently, the detection limits of anthracene and naphthalene are down to 1 and 10 ppb. The improved SERS enhancement is mainly ascribed to the host–guest effect of HS-β-CD ligands, large surface area and high-density of sub-10 nm mesopores of Au networks, as well as the enrichment effect of hydrophobic slippery surface. Moreover, the HS-β-CD (480 cm–1 band) could serve as an internal standard, leading to the ratiometric determination of anthracene ranging from 1 ppm to 1 ppb. The proposed surface modification strategy in combination with the hydrophobic slippery surface shows great potential for active capture and trace detection of persistent organic pollutants in real-world SERS applications.
中文翻译：
使用捕获配体功能化的介孔金纳米粒子作为表面增强拉曼散射基质，对多环芳烃进行比例感测。
等离子体纳米结构与目标分子之间的吸收行为在有效的表面增强拉曼散射（SERS）检测中起着关键作用。然而，对于与金属表面具有低表面亲和力的分析物，例如多环芳烃（PAHs），要观察到增强的拉曼信号仍然具有挑战性。在这项工作中，我们报道了敏感PAH检测比例SERS战略，通过3D的表面功能化有序介孔纳米金粒子（观-Au NPS）。通过使用单6-硫代-β-环糊精（HS-β-CD）作为捕获配体，疏水分子（例如蒽）可以有效地吸附在内消旋体上-Au NP表面通过主客体相互作用。此外，疏水的光滑表面用作浓缩器，以将Au /分析物液滴输送并富集到较小的区域。因此，蒽和萘的检出限降至1和10 ppb。增强的SERS增强主要归因于HS-β-CD配体的主客体效应，Au网络的大表面积和亚10 nm以下中孔的高密度以及疏水性光滑表面的富集效应。此外，HS-β-CD（480 cm –1谱带）可以作为内标，导致蒽的比例测定范围为1 ppm至1 ppb。拟议的表面改性策略与疏水性光滑表面结合在一起，在现实的SERS应用中显示了对持久性有机污染物进行主动捕获和痕量检测的巨大潜力。
更新日期：2020-09-29
中文翻译：
使用捕获配体功能化的介孔金纳米粒子作为表面增强拉曼散射基质，对多环芳烃进行比例感测。
等离子体纳米结构与目标分子之间的吸收行为在有效的表面增强拉曼散射（SERS）检测中起着关键作用。然而，对于与金属表面具有低表面亲和力的分析物，例如多环芳烃（PAHs），要观察到增强的拉曼信号仍然具有挑战性。在这项工作中，我们报道了敏感PAH检测比例SERS战略，通过3D的表面功能化有序介孔纳米金粒子（观-Au NPS）。通过使用单6-硫代-β-环糊精（HS-β-CD）作为捕获配体，疏水分子（例如蒽）可以有效地吸附在内消旋体上-Au NP表面通过主客体相互作用。此外，疏水的光滑表面用作浓缩器，以将Au /分析物液滴输送并富集到较小的区域。因此，蒽和萘的检出限降至1和10 ppb。增强的SERS增强主要归因于HS-β-CD配体的主客体效应，Au网络的大表面积和亚10 nm以下中孔的高密度以及疏水性光滑表面的富集效应。此外，HS-β-CD（480 cm –1谱带）可以作为内标，导致蒽的比例测定范围为1 ppm至1 ppb。拟议的表面改性策略与疏水性光滑表面结合在一起，在现实的SERS应用中显示了对持久性有机污染物进行主动捕获和痕量检测的巨大潜力。
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