Surface-enhanced resonance Raman spectroscopy of porphyrin and metalloporphyrin species in systems with Ag nanoparticles and their assemblies
Language English Country United States Media print
Document type Journal Article, Research Support, Non-U.S. Gov't
PubMed
10830880
DOI
10.1016/s0162-0134(99)00172-5
PII: S0162-0134(99)00172-5
Knihovny.cz E-resources
- MeSH
- Metalloporphyrins analysis MeSH
- Porphyrins analysis MeSH
- Scattering, Radiation MeSH
- Spectrum Analysis, Raman methods MeSH
- Sensitivity and Specificity MeSH
- Silver MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
- Names of Substances
- Metalloporphyrins MeSH
- Porphyrins MeSH
- Silver MeSH
The advantages of systems with Ag nanoparticles and their assemblies for surface-enhanced resonance Raman scattering (SERRS) spectral investigation, detection and determination of porphyrin species are demonstrated. SERRS spectral detection limits of the testing porphyrin species (including porphyrin aggregates) in these systems are shown to be, on average, 10(2)-10(3) lower than detection limits by resonance Raman scattering (RRS). Systems with Ag nanoparticles modified by anionic organosulfur spacers enable us to obtain SERRS spectra of unperturbed cationic porphyrin species. In the case of thiopheneacetate-modified Ag particles prepared by laser ablation, no negative effect of the spacer on the spectral detection limit of the porphyrin was observed. Systems with isolated Ag nanoparticles allow for obtaining SERRS spectra of porphyrin species upon excitation into the Soret electronic absorption band which leads to at least a 10-fold decrease in the detection limit.
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