Surface-enhanced Raman spectra of tetraporphyrin on the surface of plasmonic silver films

Absorption and Raman spectra of the tetra(4-sulfonatophenyl)porphyrin (TSPP) zwitterion in aqueous solutions under conditions at which porphyrin nanotubes (PNT) form (pH 1) are presented. TSPP was immobilized on the surface of plasmonic silver films (PSF) via quick transfer of a suspension of the mo...

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Published inJournal of applied spectroscopy pp. 159 - 164
Main Authors Gogoleva, S.D, Lavysh, A.V, Motevich, I.G, Askirka, V.F, Strekal, N.D, Sheinin, V.B, Koifman, O.I, Zenkevich, E.I, Maskevich, S.A
Format Journal Article
LanguageEnglish
Published Springer 01.05.2016
Subjects
Nanotubes
Porphyrins
Raman spectroscopy
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Summary:Absorption and Raman spectra of the tetra(4-sulfonatophenyl)porphyrin (TSPP) zwitterion in aqueous solutions under conditions at which porphyrin nanotubes (PNT) form (pH 1) are presented. TSPP was immobilized on the surface of plasmonic silver films (PSF) via quick transfer of a suspension of the molecules into a solution at pH 5 and onto the film surface in order to avoid degrading the film. Images of PNT and spheroidal TSPP aggregates on the PSF surface were visualized using confocal microscopy. Spatially resolved surface-enhanced Raman spectra (SERS) of these objects were recorded. Differences in SERS of PNT and TSPP globular aggregates are discussed based on quantum-chemical calculations of TSPP vibrational spectra. Vibrational bands sensitive to the tube--spherulite transition are found.
ISSN:0021-9037
1573-8647
DOI:10.1007/s10812-016-0263-8