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Spacer‐free SERRS spectra of unperturbed porphyrin detected at 100 fM concentration in Ag hydrosols prepared by modified Tollens method
Author(s) -
Šišková Karolína,
Bečička Ondřej,
Mašek Vlastimil,
Šafářová Klára,
Zbořil Radek
Publication year - 2012
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.3098
Subject(s) - porphyrin , metalation , chemistry , raman scattering , raman spectroscopy , free base , nanoparticle , molecule , analytical chemistry (journal) , photochemistry , materials science , stereochemistry , chromatography , nanotechnology , organic chemistry , optics , physics , salt (chemistry)
Surface‐enhanced resonance Raman scattering (SERRS) spectroscopy is a powerful tool for the selective and sensitive detection of porphyrins. We report a repeatable detection of unperturbed free base 5,10,15,20‐tetrakis(1‐methyl‐4‐pyridyl)21 H ,23 H ‐porphine in concentrations as low as 1 × 10 –13 M in the final system when Ag nanoparticles prepared by modified Tollens method are employed as Raman scattering amplifiers, i.e. without any further post‐modifications of their surface. Most probably the residues of sugar oxidation present on Ag nanoparticle surface are responsible for the effective protection of 5,10,15,20‐tetrakis(1‐methyl‐4‐pyridyl)21 H ,23 H ‐porphine molecules against the metalation by silver. Copyright © 2011 John Wiley & Sons, Ltd.