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Silver Nanoparticles Deposited on Porous Silicon as a Surface-Enhanced Raman Scattering (SERS) Active Substrate
Volume 66, Number 3 (March 2011) Page 294-299
LEILA ZEIRI, KATYA RECHAV, ZE'EV PORAT, and YEHUDA ZEIRI*
Silver nanoparticles were deposited spontaneously from their aqueous solution on a porous silicon (PS) layer. The PS acts both as a reducing agent and as the substrate on which the nanoparticles nucleate. At higher silver ion concentrations, layers of nanoparticle aggregates were formed on the PS surface. The morphology of the metallic layers and their SERS activity were influenced by the concentrations of the silver ion solutions used for deposition. Raman measurements of rhodamine 6G (R6G) and crystal violet (CV) adsorbed on these surfaces showed remarkable enhancement of up to about 10 orders of magnitude.
Index Headings: Porous silicon; Metal deposition; Rhodamine 6G; Crystal violet; Surface-enhanced Raman scattering; SERS.