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Porous silicon as efficient surface enhanced Raman scattering (SERS) substrate |
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| Authors: | F Giorgis E Descrovi E Froner A Venturello |
| Institution: | a Materials and Microsystems Laboratory χLab, Physics Department, Politecnico of Torino, C.so Duca degli Abruzzi 24, 10129 Torino, Italy b Physics Department, University of Trento, Via Sommarive 14, 38050 Povo, Italy c Materials Science and Chemical Engineering Department, Politecnico of Torino, C.so Duca degli Abruzzi 24, 10129 Torino, Italy |
| Abstract: | Silver nanocrystallites are obtained through immersion of porous silicon samples in AgNO3 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. |
| Keywords: | 78 30 &minus j 78 30 Jw 87 64 kp 73 20 Mf 78 67 Bf |
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