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Issue 1, 2007
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Tuning plasmons on nano-structured substrates for NIR-SERS

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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.

Graphical abstract: Tuning plasmons on nano-structured substrates for NIR-SERS

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Publication details

The article was received on 16 Aug 2006, accepted on 09 Nov 2006 and first published on 23 Nov 2006

Article type: Paper
DOI: 10.1039/B611803H
Citation: Phys. Chem. Chem. Phys., 2007,9, 104-109
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    Tuning plasmons on nano-structured substrates for NIR-SERS

    S. Mahajan, M. Abdelsalam, Y. Suguwara, S. Cintra, A. Russell, J. Baumberg and P. Bartlett, Phys. Chem. Chem. Phys., 2007, 9, 104
    DOI: 10.1039/B611803H

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