Nanostructured gold films for SERS by block copolymer-templated galvanic displacement reactions

Yong Wang, Michael Becker, Li Wang, Jinquan Liu, Roland Scholz, Juan Peng, Ulrich Gösele, Silke Christiansen, Dong Ha Kim, Martin Steinhart

Research output: Contribution to journalArticlepeer-review

127 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)2384-2389
Number of pages6
JournalNano Letters
Volume9
Issue number6
DOIs
StatePublished - 10 Jun 2009

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