SERRS microspectroscopy of porphyrins on Ag immobilized nanoparticles

SERRS spectra of cationic 5,10,15,20-tetrakis(1-methyl-4-pyridyl)porphyrin (TMPyP) on Ag nanoparticles immobilized to glass via silane or by drying were measured using confocal Raman microspectrometer. The limit of detection (LOD) of TMPyP on Ag silanized glass plates was ∼1 × 10 −8 M, but spectra s...

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Bibliographic Details
Published in:Journal of molecular structure 2011-05, Vol.993 (1), p.425-427
Main Authors: Simakova, Petra, Prochazka, Marek
Format: Article
Language:English
Subjects:
Ag immobilized nanoparticles
Band spectra
carbon
detection limit
drying
glass
nanoparticles
nanosilver
Porphyrin
porphyrins
Raman microspectroscopy
SERS
thermal degradation
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Summary:SERRS spectra of cationic 5,10,15,20-tetrakis(1-methyl-4-pyridyl)porphyrin (TMPyP) on Ag nanoparticles immobilized to glass via silane or by drying were measured using confocal Raman microspectrometer. The limit of detection (LOD) of TMPyP on Ag silanized glass plates was ∼1 × 10 −8 M, but spectra suffered from presence of spurious bands originating from carbon species mainly as a result of thermal decomposition of silane. Ag colloid/TMPyP drops dried on glass show better spectra and fewer spurious bands for the same TMPyP concentration compared to the silanized surfaces. Dried drops form a ring in the edge part of the drop containing high enhancing sites (big aggregates with some ‘hot spots‘) providing high SERRS signal of TMPyP in extremely short acquisition times (1 s). Despite the problems with spurious bands, Raman microspectroscopy from immobilized Ag colloidal nanoparticles improves SERS sensitivity and reproducibility in comparison to macro-Raman measurements in Ag colloidal solution.
ISSN:0022-2860
1872-8014
DOI:10.1016/j.molstruc.2010.12.037