title: Surface-enhanced resonance Raman scattering of porphyrins on gold nanoparticles attached to silanized glass plates.
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 (1 x 10(-4) to 1 x 10(-7)M) of primary solution do not show any sign of porphyrin metalation or perturbation of its native structure. Optimal adsorption time (15-20 min) and covering concentration limit (lower than 1 x 10(-5)M) of porphyrins have been estimated from the concentration and soaking time dependences of SERRS spectra.
authors.affiliation: Charles University, Faculty of Mathematics and Physics, Institute of Physics, Ke Karlovu 5, CZ-12116 Prague 2, Czech Republic.
authors.forename: Marek
authors.initials: M
authors.lastname: Procházka
authors.forename: Natália
authors.initials: N
authors.lastname: Hajduková
authors.forename: Josef
authors.initials: J
authors.lastname: Stepánek
mesh_terms: D003102:Colloids / Q000737:chemistry; D005898:Glass / Q000737:chemistry; D006046:Gold / Q000737:chemistry*; D015394:Molecular Structure; D049329:Nanostructures / Q000737:chemistry*; D036103:Nanotechnology / Q000379:methods; D011166:Porphyrins / Q000737:chemistry*; D013059:Spectrum Analysis, Raman / Q000379:methods*; D013499:Surface Properties; D014732:Vibration
chemical_list: D003102:Colloids; D011166:Porphyrins; C016136:tetraphenylporphine sulfonate; C021096:tetra(4-N-methylpyridyl)porphine; D006046:Gold