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Tuning plasmons on nano-structured substrates for NIR-SERS

Tuning plasmons on nano-structured substrates for NIR-SERS
Tuning plasmons on nano-structured substrates for NIR-SERS
Surface-Enhanced Raman Spectroscopy (SERS) is a very sensitive and selective technique for detecting surface species. Colloidal crystal-templated 'inverse opal' nanostructured gold films have been demonstrated to be excellent SERS substrates by various researchers around the globe. However, visible excitation laser sources commonly used in SERS experiments can cause photochemical reactions on the surface as well as fluorescence from the adsorbed molecules. A way to circumvent this possibility is the use of Near Infra-Red (NIR) laser sources. This demands appropriate design of substrates for NIR-SERS in order to obtain maximum enhancement of signals from analytes. In the current paper, we use systematic variation of sphere size and electrochemical control over film height to tune plasmons on such nanovoid substrates. We use plasmon maps as a tool for predicting NIR-SERS enhancements recorded with a 1064 nm laser source for benzenethiol as the probe molecule. Direct correlation is observed between Raman enhancements and plasmonic resonances with ingoing and outcoming radiation. Our study demonstrates the feasibility of plasmon engineering and the predictive power of their mapping on our substrates. It also demonstrates the ability to design reproducible NIR-SERS substrates and its empirical fruition.
enhanced raman-spectroscopy, self-assembled monolayers, nanosphere lithography, optical-properties, surface, films, crystals, silver
1463-9076
104-109
Mahajan, Sumeet
b131f40a-479e-4432-b662-19d60d4069e9
Abdelsalam, Mamdouh
d1cbddcb-9f5c-46d5-b774-1bbaee26e115
Suguwara, Yoshiro
91efd23a-4bb2-4e44-a0a3-1675f6ed3c7b
Cintra, Suzanne
9a674f60-8fac-4415-a048-35ed354c49ff
Russell, Andrea
b6b7c748-efc1-4d5d-8a7a-8e4b69396169
Baumberg, Jeremy
44ce7dca-7035-4043-9a92-3e8a69a31f72
Bartlett, Philip
d99446db-a59d-4f89-96eb-f64b5d8bb075
Mahajan, Sumeet
b131f40a-479e-4432-b662-19d60d4069e9
Abdelsalam, Mamdouh
d1cbddcb-9f5c-46d5-b774-1bbaee26e115
Suguwara, Yoshiro
91efd23a-4bb2-4e44-a0a3-1675f6ed3c7b
Cintra, Suzanne
9a674f60-8fac-4415-a048-35ed354c49ff
Russell, Andrea
b6b7c748-efc1-4d5d-8a7a-8e4b69396169
Baumberg, Jeremy
44ce7dca-7035-4043-9a92-3e8a69a31f72
Bartlett, Philip
d99446db-a59d-4f89-96eb-f64b5d8bb075

Mahajan, Sumeet, Abdelsalam, Mamdouh, Suguwara, Yoshiro, Cintra, Suzanne, Russell, Andrea, Baumberg, Jeremy and Bartlett, Philip (2007) Tuning plasmons on nano-structured substrates for NIR-SERS. Physical Chemistry Chemical Physics, 9 (1), 104-109. (doi:10.1039/b611803h).

Record type: Article

Abstract

Surface-Enhanced Raman Spectroscopy (SERS) is a very sensitive and selective technique for detecting surface species. Colloidal crystal-templated 'inverse opal' nanostructured gold films have been demonstrated to be excellent SERS substrates by various researchers around the globe. However, visible excitation laser sources commonly used in SERS experiments can cause photochemical reactions on the surface as well as fluorescence from the adsorbed molecules. A way to circumvent this possibility is the use of Near Infra-Red (NIR) laser sources. This demands appropriate design of substrates for NIR-SERS in order to obtain maximum enhancement of signals from analytes. In the current paper, we use systematic variation of sphere size and electrochemical control over film height to tune plasmons on such nanovoid substrates. We use plasmon maps as a tool for predicting NIR-SERS enhancements recorded with a 1064 nm laser source for benzenethiol as the probe molecule. Direct correlation is observed between Raman enhancements and plasmonic resonances with ingoing and outcoming radiation. Our study demonstrates the feasibility of plasmon engineering and the predictive power of their mapping on our substrates. It also demonstrates the ability to design reproducible NIR-SERS substrates and its empirical fruition.

Full text not available from this repository.

More information

Accepted/In Press date: 9 November 2006
e-pub ahead of print date: 23 November 2006
Published date: 2007
Additional Information: Times Cited: 43
Keywords: enhanced raman-spectroscopy, self-assembled monolayers, nanosphere lithography, optical-properties, surface, films, crystals, silver
Organisations: Chemistry, Institute for Life Sciences

Identifiers

Local EPrints ID: 342924
URI: http://eprints.soton.ac.uk/id/eprint/342924
ISSN: 1463-9076
PURE UUID: e6ed2f83-14ce-4be2-ab8a-35fd9406549b
ORCID for Sumeet Mahajan: ORCID iD orcid.org/0000-0001-8923-6666
ORCID for Andrea Russell: ORCID iD orcid.org/0000-0002-8382-6443
ORCID for Philip Bartlett: ORCID iD orcid.org/0000-0002-7300-6900

Catalogue record

Date deposited: 19 Sep 2012 13:47
Last modified: 18 Feb 2021 17:09

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