Dynamic enrichment of plasmonic hot-spots and analytes on superhydrophobic and magnetically functionalized platform for surface-enhanced Raman scattering
| Autor: | Yibo Gao, Xuee Chen, Weijia Wen, Bing Ji, Shunbo Li, Bingpu Zhou, Ge Chen, Ziyi Dai |
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| Rok vydání: | 2020 |
| Předmět: |
Detection limit
Analyte Materials science Metals and Alloys Nanoparticle Nanotechnology 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Evaporation (deposition) 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials symbols.namesake Materials Chemistry symbols Electrical and Electronic Engineering 0210 nano-technology Raman spectroscopy Instrumentation Plasmon Raman scattering Hydrophobic silica |
| Zdroj: | Web of Science |
| ISSN: | 0925-4005 |
| DOI: | 10.1016/j.snb.2020.128297 |
| Popis: | Surface-enhanced Raman scattering (SERS) has been considered as one powerful tool for trace detection in various fields from biochemical analysis to environmental monitoring. Even metallic nano-particles based platform has proved to be an efficient way for signal enhancement, the random distribution of plasmonic nano-particles and target analytes normally impose restrictions on the detection limit and signal uniformity. In this work, we propose a facile and effective strategy to realize the dynamic enrichment of analyte molecules and AuNPs within the evaporating micro-droplet for SERS based on the superhydrophobic and magnetically functionalized PDMS membrane. Integrated with the computer-based controller, the membrane decorated with hydrophobic silica nanoparticles enables to maintain the de-pinning status of the micro-droplet by driving the droplet back-and-forth during the evaporation and enrichment process. Through optimizing the parameters of the dynamic enrichment strategy, the diameter of the final deposition pattern of the micro-droplet (containing 10 μL AuNPs and 10 μL R6 Gmolecules) has been concentrated to ∼ 0.4 mm thanks to the continuous de-pinning effect. The Raman signal has been further intensified by ∼3.9 times with optimized uniformity (RSD of ∼8.2 %) compared with the static enrichment mode on superhydrophobic surface. Thanks to the ultra-enrichment capability, the platform can well detect the concentration of R6 G probe molecules down to 10−17 mol/L. We believe that the proposed approach can be promising for exploiting cost-effective and versatile platform in future application such as biological analysis, chemical micro-reactions, and trace molecule detections. |
| Databáze: | OpenAIRE |
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