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Proceedings Paper

Silver-coated nanoporous silicon as SERS-active substrate for investigation of tetrapyrrolic molecules
Author(s): A. Yu. Panarin; P.-Y. Turpin
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Paper Abstract

A fabrication of the surface-enhanced Raman scattering (SERS) active substrates has been developed by immersion plating of the silver onto porous silicon (Ag-por-Si). Effects of the porous silicon morphology on the structure of the Ag films have been analyzed by scanning electronic microscope. Activity of the Ag-coated por-Si toward SERS was estimated using water-soluble porphyrins as analyte molecules. The Ag-por-Si samples were appeared to be sensitive and stable SERS-active substrates. It has been found that the variation of SERS signal scanned over the sample surface is less than 9%. Additionally, plates of Ag-por-Si displayed high sensitivity being stored within 1 month in the air. It was shown that even several minutes incubation of Ag-por-Si in solution is enough to obtain well-defined SERS signal. SERS spectra of the water-soluble cationic tetrakis(N-methylpyridyl)porphyrin (H2TMPyP4) and anionic tetrakis(sulfonatophenyl)porphyrin (H2TPPS) were compared with their resonance Raman (RR) spectra. For the cationic H2TMPyP4 the partial metallation has been detected during impregnation of the porphyrin molecules on the Ag-por-Si surface. In case of the anionic H2TPPS there was no evidence of the silver complex formation.

Paper Details

Date Published: 31 July 2007
PDF: 6 pages
Proc. SPIE 6728, ICONO 2007: Novel Photonics Materials; Optics and Optical Diagnostics of Nanostructures, 672828 (31 July 2007); doi: 10.1117/12.752423
Show Author Affiliations
A. Yu. Panarin, Institute of Molecular and Atomic Physics (Belarus)
P.-Y. Turpin, Pierre and Marie Curie Univ. (France)


Published in SPIE Proceedings Vol. 6728:
ICONO 2007: Novel Photonics Materials; Optics and Optical Diagnostics of Nanostructures

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