Nanostructured Gold Films for SERS by Block Copolymer-Templated Galvanic Displacement Reactions

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• 作者：Yong Wang ; Michael Becker ; Li Wang ; Jinquan Liu ; Roland Scholz ; Juan Peng ; Ulrich Gsele ; Silke Christiansen ; Dong Ha Kim ; Martin Steinhart
• 刊名：Nano Letters
• 出版年：2009
• 出版时间：June 10, 2009
• 年：2009
• 卷：9
• 期：6
• 页码：2384-2389
• 全文大小：229K
• 年卷期：v.9,no.6(June 10, 2009)
• ISSN：1530-6992

文摘

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.