Journal
APPLIED SURFACE SCIENCE
Volume 254, Issue 22, Pages 7494-7497Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2008.06.029
Keywords
Raman spectroscopy; SERS; porous silicon
Categories
Funding
- National Project PRIN 2005 on dvanced Photonic Devices for Biomedical Applications''
- Piedmont Regional project 2007 Smart Plasmonic Surfaces for Enhanced Raman Spectroscopy in Bioogical Assays''
- FIRB LATEMAR 2004
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Silver nanocrystallites are obtained through immersion of porous silicon samples in AgNO(3) solutions and a successive thermal annealing. The efficiency of nanostructures as surface enhanced Raman scattering (SERS) substrates is checked on cyanine-based dyes and horseradish peroxidase, evidencing detectable concentrations as low as 10(-7) to 10(-8) M. The substrate efficiency is strictly related to the Ag particle morphology, which could yield to either local surface plasmons (LSP) coupled to individual particles or to inter-particle short-range interaction. (C) 2008 Elsevier B. V. All rights reserved.
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