Journal
SMALL
Volume 5, Issue 20, Pages 2333-2337Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.200900577
Keywords
silver; surface-enhanced Raman scattering; surface plasmons; template synthesis
Categories
Funding
- National Natural Science Foundation of China [50801013]
- Specialized Research Fund for the Doctoral Program of Higher Education [200802861065]
- Hong Kong Research Grants Council (RGC) General Research Fund (GRf) [112307]
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A convenient nanoscale technique is reported for the fabrication of highly ordered hemispherical silver nanocap arrays templated by porous anodic alumina (PAA) membranes as robust and cost-efficient surface-enhanced Raman scattering (SERS) substrates. This geometry produces a high Raman signal due to its periodic hexagonal arrangements and control of the gap between the nanostructures in the sub-10-nm regime. The surface structure can be tuned further to optimize the enhancement factor according to optional PAA fabrication and silver deposition parameters. Finite-difference time-domain calculations indicate that the structure may possess excellent SERS characteristics due to the high density and abundance of hot spots.
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