Journal
NANO LETTERS
Volume 9, Issue 6, Pages 2384-2389Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl900939y
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Funding
- German Research Foundation [STE 1127/8-1, STE 1127/6-3, CH159/6-1]
- Max Planck Society (NanoSTRESS),
- Korean government (MEST) [R11-2005-008-00000-0]
- Alexander von Humboldt Foundation
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Up to now, little effort has been made to exploit large-area high-throughput patterning by block copolymer (BCP) lithography to generate nanostructured substrates with periods well below 100 nm for surface-enhanced Raman scattering (SERS). We show that simple BCP-templated galvanic displacement reactions yield dense arrays of mushroom-shaped gold nanopillars with a period of 50 nm. The nanoporous BCP films used as templates were obtained by swelling-induced reconstruction of reverse micelle monolayers deposited on silicon wafers. Coupling of adjacent mushroom caps almost impinging on each other combined with their strong local curvature results in a high spatial density of hot spots in the narrow gaps between them. Thus, substrates characterized by high SERS efficiencies are obtained.
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