Dr. Andrei Yu. Panarin Profile

Dr. Andrei Yu. Panarin

at Institute of Molecular and Atomic Physics

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Proceedings Article | 31 July 2007 Paper

Silver-coated nanoporous silicon as SERS-active substrate for investigation of tetrapyrrolic molecules

A. Yu. Panarin, P.-Y. Turpin

Proceedings Volume 6728, 672828 (2007) https://doi.org/10.1117/12.752423

KEYWORDS: Surface enhanced Raman spectroscopy, Silver, Silicon, Molecules, Raman spectroscopy, Particles, Scanning electron microscopy, Metals, Plating, Semiconducting wafers

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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.

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