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

doi:10.1021/nl900939y

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

Department of Chemistry & Nanoscience

Research output: Contribution to journal › Article › peer-review

138 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 language	English
Pages (from-to)	2384-2389
Number of pages	6
Journal	Nano Letters
Volume	9
Issue number	6
DOIs	https://doi.org/10.1021/nl900939y
State	Published - 10 Jun 2009

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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.",

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T1 - Nanostructured gold films for SERS by block copolymer-templated galvanic displacement reactions

AU - Wang, Yong

AU - Becker, Michael

AU - Wang, Li

AU - Liu, Jinquan

AU - Scholz, Roland

AU - Peng, Juan

AU - Gösele, Ulrich

AU - Christiansen, Silke

AU - Kim, Dong Ha

AU - Steinhart, Martin

PY - 2009/6/10

Y1 - 2009/6/10

N2 - 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.

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

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