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SEM images of the samples obtained at different fabrication steps: (a) top view of silver nanoislands created by annealing a silver film, (b) nanopillars fabricated by etching the substrate through silver nanoislands; the pillar sidewalls are then coated with gold nanoparticles, (c) the sample in (b) after normal-incidence evaporation of gold onto its surface, and (d) nanopillars coated with a thicker layer of gold and without forming protective metal rings on their ends.
SEM images of the samples with gold-coated nanopillars of 140 nm lengths (a) with and (b) without gold nanoparticles on their sidewalls (see the insets). Case (c) illustrates SERS spectra of 10 M solution of methylene blue on these substrates (red and black curves) and, for comparison, a scaled up Raman spectrum of a methylene-blue powder (blue curve).
SEM images of substrates with silicon nanopillars of (a) 90 and (b) 175 nm lengths coated with gold. Case (c) introduces SERS spectra measured for 10 M solution of methylene blue on these substrates (blue and red curves, respectively) and on a substrate shown in Fig. 1(d) (black curve).
SERS spectrum of a monolayer of thioglycerol on a substrate of Fig. 2(a) (red curve) and 500 times magnified Raman spectra of bulk thioglycerol layers. The layer thickness is 80 m (black curve), 48 m (blue curve), and 25 m (green curve).
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