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Silica-covered star-shaped Au-Ag nanoparticles as new electromagnetic nanoresonators for Raman characterisation of surfaces

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dc.abstract.enOne of the tools used for determining the composition of surfaces of various materials is shell-isolated nanoparticle-enhanced Raman spectroscopy (SHINERS). SHINERS is a modification of “standard” surface-enhanced Raman spectroscopy (SERS), in which, before Raman spectra are recorded, the surfaces analysed are covered with a layer of plasmonic nanoparticles protected by a very thin layer of a transparent dielectric. The plasmonic cores of the core-shell nanoparticles used in SHINERS measurements generate a local enhancement of the electric field of the incident electromagnetic radiation, whereas the transparent coatings prevent the metal cores from coming into direct contact with the material being analysed. In this contribution, we propose a new type of SHINERS nanoresonators that contain spiky, star-shaped metal cores (produced from a gold/silver alloy). These spiky, star-shaped Au-Ag nanoparticles have been covered by a layer of silica. The small radii of the ends of the tips of the spikes of these plasmonic nanostructures make it possible to generate a very large enhancement of the electromagnetic field there, with the result that such SHINERS nanoresonators are significantly more efficient than the standard semi-spherical nanostructures. The Au-Ag alloy nanoparticles were synthesised by the reduction of a solution containing silver nitrate and chloroauric acid by ascorbic acid. The final geometry of the nanostructures thus formed was controlled by changing the ratio between the concentrations of AuCl4 − and Ag+ ions. The shape of the synthesised star-shaped Au-Ag nanoparticles does not change significantly during the two standard procedures for depositing a layer of silica (by the decomposition of sodium silicate or the decomposition of tetraethyl orthosilicate).
dc.affiliationUniwersytet Warszawski
dc.contributor.authorPietrasik, Sylwia
dc.contributor.authorKudelski, Andrzej
dc.contributor.authorKrajczewski, Jan
dc.contributor.authorKołątaj, Karol
dc.date.accessioned2024-01-26T07:36:47Z
dc.date.available2024-01-26T07:36:47Z
dc.date.issued2018
dc.description.financeNie dotyczy
dc.description.volume193
dc.identifier.doi10.1016/J.SAA.2017.11.060
dc.identifier.issn1386-1425
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/119808
dc.languageeng
dc.pbn.affiliationchemical sciences
dc.relation.ispartofSpectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
dc.relation.pages1-7
dc.rightsClosedAccess
dc.sciencecloudnosend
dc.subject.enShell-isolated nanoparticle-enhanced Raman spectroscopy SHINERS Surface-enhanced Raman spectroscopy Star-shaped Au-Ag nanoparticles
dc.titleSilica-covered star-shaped Au-Ag nanoparticles as new electromagnetic nanoresonators for Raman characterisation of surfaces
dc.typeJournalArticle
dspace.entity.typePublication