کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1249760 970729 2008 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
SERRS of free-base porphyrins on immobilized metal gold and silver nanoparticles
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
SERRS of free-base porphyrins on immobilized metal gold and silver nanoparticles
چکیده انگلیسی

SERRS of three differently charged free-base porphyrins, namely cationic 5,10,15,20-tetrakis(1-methyl-4-pyridyl) porphyrin (TMPyP), anionic 5,10,15,20-tetrakis(4-sulfonatophenyl) porphyrin (TSPP), and neutral 5,10,15,20-tetrakis(tetraphenylporphyrin) (TPP), was measured on SERS-active substrates prepared by immobilization of Ag or Au nanoparticles to silanized glass plates. Au surfaces were suitable for TMPyP and TSPP detection while Ag surfaces for TMPyP and TPP. SERRS spectra exhibited excellent reproducibility, very good stability in time (relative standard deviation lower than 10%) and did not contain any sign of the porphyrin metalation or perturbation of its native structure. Even SERRS spectra of water-insoluble porphyrin (TPP) were obtained without any interference of solvent Raman signal. Estimated limits of detection (LOD) were between 3 × 10−9 and 8 × 10−8 M porphyrin concentrations in soaking solution. SERRS on immobilized Ag and Au nanoparticles was found a suitable analytical method for detection of free-base (including water-insoluble) porphyrins, advantagenous considerably with respect to routinely used metal sols.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Vibrational Spectroscopy - Volume 48, Issue 1, 18 September 2008, Pages 142–147
نویسندگان
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