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Tunable microstructured surface-enhanced Raman scattering substrates via electrohydrodynamic lithography

Tunable microstructured surface-enhanced Raman scattering substrates via electrohydrodynamic lithography
Tunable microstructured surface-enhanced Raman scattering substrates via electrohydrodynamic lithography
Readily fine-tuned structures are an important requirement for the optimization of surface-enhanced Raman scattering (SERS) to obtain the highest enhancements. Here, a lateral modulation of an electric field applied to a dielectric interface enables the rapid replication of nearly any topographic morphology with micrometer resolution by electrohydrodynamic lithography (EHL). Gold-covered periodic EHL-generated arrays yielded the reproducible enhancement of adsorbed SERS-active molecules. Periodic arrays of micropillars with square and circular cross sections give rise to the effective coupling of surface plasmon modes, which generate enhanced SERS signals. The overall enhancement factors depend on the geometry of the gold-coated structures, and intriguingly, a strong correlation is found with the gap-to-width ratio of the square pillar morphology. A numerical simulation of the EHL-based SERS substrates is consistent with this dependence. The EHL surface architectures can be easily tailored at micrometer-to-submicrometer dimensions, allowing the fabrication of reliably engineered and cost-effective highly sensitive SERS substrates.
1948-7185
4153-4159
Mahajan, Sumeet
b131f40a-479e-4432-b662-19d60d4069e9
Hutter, Tanya
b9494787-9ae0-4887-b4ee-dbe0a0b774b1
Steiner, Ullrich
839dfd85-73db-4125-b9e9-775296f6411f
Goldberg Oppenheimer, Pola
8955c6a5-21cb-4942-94d3-b8377b0ae1c4
Mahajan, Sumeet
b131f40a-479e-4432-b662-19d60d4069e9
Hutter, Tanya
b9494787-9ae0-4887-b4ee-dbe0a0b774b1
Steiner, Ullrich
839dfd85-73db-4125-b9e9-775296f6411f
Goldberg Oppenheimer, Pola
8955c6a5-21cb-4942-94d3-b8377b0ae1c4

Mahajan, Sumeet, Hutter, Tanya, Steiner, Ullrich and Goldberg Oppenheimer, Pola (2013) Tunable microstructured surface-enhanced Raman scattering substrates via electrohydrodynamic lithography. The Journal of Physical Chemistry Letters, 4, 4153-4159. (doi:10.1021/jz4018688).

Record type: Article

Abstract

Readily fine-tuned structures are an important requirement for the optimization of surface-enhanced Raman scattering (SERS) to obtain the highest enhancements. Here, a lateral modulation of an electric field applied to a dielectric interface enables the rapid replication of nearly any topographic morphology with micrometer resolution by electrohydrodynamic lithography (EHL). Gold-covered periodic EHL-generated arrays yielded the reproducible enhancement of adsorbed SERS-active molecules. Periodic arrays of micropillars with square and circular cross sections give rise to the effective coupling of surface plasmon modes, which generate enhanced SERS signals. The overall enhancement factors depend on the geometry of the gold-coated structures, and intriguingly, a strong correlation is found with the gap-to-width ratio of the square pillar morphology. A numerical simulation of the EHL-based SERS substrates is consistent with this dependence. The EHL surface architectures can be easily tailored at micrometer-to-submicrometer dimensions, allowing the fabrication of reliably engineered and cost-effective highly sensitive SERS substrates.

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More information

Published date: 19 November 2013
Organisations: Institute for Life Sciences, Organic Chemistry: SCF

Identifiers

Local EPrints ID: 360182
URI: http://eprints.soton.ac.uk/id/eprint/360182
ISSN: 1948-7185
PURE UUID: 697f9960-0fa8-46da-88cf-eb5b3bbfc6e1
ORCID for Sumeet Mahajan: ORCID iD orcid.org/0000-0001-8923-6666

Catalogue record

Date deposited: 28 Nov 2013 13:37
Last modified: 09 Nov 2021 03:16

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Contributors

Author: Sumeet Mahajan ORCID iD
Author: Tanya Hutter
Author: Ullrich Steiner
Author: Pola Goldberg Oppenheimer

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