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SERS-active substrates based on n-type porous silicon
- Publication Year :
- 2010
-
Abstract
- Porous silicon (PS) prepared from n-type Si crystal is proposed as a new material for the fabrication of sensitive substrates for surface-enhanced Raman scattering (SERS). The formation procedure for nanostructured silver films on the surface of PS was optimized. Maximum of SERS enhancement for rhodamine 6G probing molecule is observed for samples obtained by the immersion plating from the water solution of AgNO 3 with the 10 mM concentration during 5 min. The dependence of morphological parameters of PS and corresponding silvered surfaces on the anodization current density has been studied. It is shown that the most SERS activities possess substrates produced from PS with lower porosity. The optimum of the PS layer thickness for high Raman signal is about 5 μm. The detection limit for rhodamine 6G adsorbed on Ag-coated PS from the 100 pM solution is established to be comparable with that for p-type PS-based substrates. Thus, the n-type porous silicon is suitable material for the preparation of sensitive SERS-active substrates.
- Subjects :
- Materials science
Silicon
business.industry
General Physics and Astronomy
chemistry.chemical_element
Surfaces and Interfaces
General Chemistry
Condensed Matter Physics
Porous silicon
Surfaces, Coatings and Films
Rhodamine
Rhodamine 6G
symbols.namesake
chemistry.chemical_compound
Optics
chemistry
Chemical engineering
symbols
Thin film
Raman spectroscopy
Porous medium
business
Raman scattering
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....0602af43badaa434f5cc739112200b4f