Publication at Faculty of Mathematics and Physics |
2006
Abstract
Surface-enhanced resonance Raman scattering (SERRS) spectra of cationic 5,10,15,20-tetrakis(1-methyl-4-pyridyl) porphyrin (TMPyP) and anionic 5,10,15,20-tetrakis(4-sulfonatophenyl) porphyrin (TSPP) were measured from gold surfaces prepared by attaching citrate-reduced colloidal nanoparticles to glass slides silanized by 3-aminopropyltrimethoxysilane. SERRS spectra of both porphyrins obtained in a large concentration range (1x10-4-1x10-7 M) of primary solution do not show any sign of porphyrin metalation or perturbation of its native structure.
Optimal adsorption time (15-20 minutes) and covering concentration limit (lower than 1x10-5 M) of porphyrins have been estimated from the concentration and soaking time dependences of SERRS spectra.