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Large-area nanostructured substrates for surface enhanced Raman spectroscopy
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View: Figures


Image of FIG. 1.
FIG. 1.

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.

Image of FIG. 2.
FIG. 2.

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).

Image of FIG. 3.
FIG. 3.

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).

Image of FIG. 4.
FIG. 4.

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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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Large-area nanostructured substrates for surface enhanced Raman spectroscopy