Polymeric micro-reactors mediated synthesis and assembly of Ag nanoparticles into cube-like superparticles for SERS application
| Autor: | Xuesong Li, Baosen Hou, Dawei Zhang, Xuan Zhou, Xiaohong He, Kun Jia, Xiaobo Liu, Yan Hong, Junni Xie |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Plasmonic nanoparticles
Materials science General Chemical Engineering 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Industrial and Manufacturing Engineering Silver nanoparticle 0104 chemical sciences chemistry.chemical_compound symbols.namesake Sulfonate chemistry Chemical engineering Nanosensor Amphiphile Side chain Copolymer symbols Environmental Chemistry 0210 nano-technology Raman spectroscopy |
| Zdroj: | Chemical Engineering Journal. 395:125123 |
| ISSN: | 1385-8947 |
| DOI: | 10.1016/j.cej.2020.125123 |
| Popis: | Hierarchical anisotropic superparticles derived from the controlled assembly of individual plasmonic nanoparticles have been recognized as promising building blocks for surface-enhanced Raman spectroscopy (SERS) nanosensors. Thus, the protocols that precisely control the near-field coupling of individual plasmonic nanoparticles and the diffusion of highly diluted analytes to the plasmonic surface are of great interests. Herein, we have synthesized a series of aromatic amphiphilic block copolymers named as polyarylene ether nitrile (amPEN in short), containing a hydrophobic backbone of aromatic moieties with hydrophilic sulfonate/carboxyl and cyano groups in the side chain. Next, the surfactant stabilized water-in-oil (W/O) reverse emulsion is constructed to induce the confined self-assembly of amPEN, leading to the formation of functional micro-reactors for the in-situ synthesis and organization of silver nanoparticles, which finally contribute to the generation of sub-micrometer cube-like plasmonic superparticles (PSPs). Furthermore, the SERS nanosensors are created by drop-casting of synthesized PSPs on silicon substrate followed by depositing an additional thin layer of silver. Finally, the optimized SERS nanosensors with a Raman enhancement factor of 108 are able to detect chlorpyrifos pesticide down to 10-10 M thanks to the presence of abundant Raman hot-spots on the synthesized PSPs and the effective analyte enrichment derived from π-π interaction between pesticide molecules and aromatic backbone of amPEN. |
| Databáze: | OpenAIRE |
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