期刊
MOLECULES
卷 27, 期 10, 页码 -出版社
MDPI
DOI: 10.3390/molecules27103081
关键词
magnetic-plasmonic nanostructures; surface-enhanced Raman scattering; coffee-ring effect
资金
- National Science Centre, Poland [2017/25/B/ST5/01997]
The study introduces a novel magnetic-silver plasmonic nanomaterial that can be manipulated using a magnetic field and applied in Raman spectroscopy. By creating nanoresonators on silver plasmonic structures, the intensity of electromagnetic radiation can be enhanced across a wider frequency range.
Nanostructures made of magnetic cores (from Fe3O4) with attached silver plasmonic nanostructures were covered with a very thin layer of silica. The (Fe3O4@Ag)@SiO2 magnetic-plasmonic nanomaterial can be manipulated using a magnetic field. For example, one can easily form homogeneous layers from this nanomaterial using a very simple procedure: deposition of a layer of a sol of such a nanostructure and evaporation of the solvent after placing the sample in a strong magnetic field. Due to the rapid magnetic immobilization of the magnetic-plasmonic nanomaterial on the investigated surface, no coffee-ring effect occurs during the evaporation of the solvent. In this contribution, we report the first example of a magnetic, silver-based plasmonic nanomaterial for shell-isolated nanoparticle-enhanced Raman spectroscopy (SHINERS). Nanoresonators based on silver plasmonic nanostructures locally enhance the intensity of the exciting electromagnetic radiation in a significantly broader frequency range than the previously used magnetic SHINERS nanoresonators with gold plasmonic nanostructures. Example applications where the resulting nanomaterial was used for the SHINERS investigation of a monolayer of mercaptobenzoic acid chemisorbed on platinum, and for a standard SERS determination of dopamine, are also presented.
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