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Detection of ultra-low refractive index variations with colloidal nanoprobes

Detection of ultra-low refractive index variations with colloidal nanoprobes
Detection of ultra-low refractive index variations with colloidal nanoprobes
We implement a simple and fast technique to detect spectral shifts in the light scattering of gold nanoparticles due to refractive index changes of the surrounding medium. Spectral shifts are detected using spectrally balanced photon counting from the scattering spectrum of colloidal gold nanoparticles. We demonstrate the use of this technique for sensing ethanol concentration down to 0.1 M.
Optical sensor, Refractive index, Gold nanoparticles, Plasmon, Ethanol
0925-4005
1269-1271
Andreakou, P.
9a6d6dea-bb9a-46e1-b50b-b200bcfd5b6c
Hands, S.
2346ad0e-d9fa-4e2e-82dc-ead4b223d618
Lagoudakis, P. G.
ea50c228-f006-4edf-8459-60015d961bbf
Andreakou, P.
9a6d6dea-bb9a-46e1-b50b-b200bcfd5b6c
Hands, S.
2346ad0e-d9fa-4e2e-82dc-ead4b223d618
Lagoudakis, P. G.
ea50c228-f006-4edf-8459-60015d961bbf

Andreakou, P., Hands, S. and Lagoudakis, P. G. (2012) Detection of ultra-low refractive index variations with colloidal nanoprobes. Sensors and Actuators B: Chemical, 171, 1269-1271. (doi:10.1016/j.snb.2012.04.053).

Record type: Article

Abstract

We implement a simple and fast technique to detect spectral shifts in the light scattering of gold nanoparticles due to refractive index changes of the surrounding medium. Spectral shifts are detected using spectrally balanced photon counting from the scattering spectrum of colloidal gold nanoparticles. We demonstrate the use of this technique for sensing ethanol concentration down to 0.1 M.

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Published date: 2012
Keywords: Optical sensor, Refractive index, Gold nanoparticles, Plasmon, Ethanol
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Identifiers

Local EPrints ID: 430547
URI: http://eprints.soton.ac.uk/id/eprint/430547
DOI: doi:10.1016/j.snb.2012.04.053
ISSN: 0925-4005
PURE UUID: 3f33dce3-93f6-4492-86d1-408de3ce48c1
ORCID for P. G. Lagoudakis: ORCID iD orcid.org/0000-0002-3557-5299

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Date deposited: 03 May 2019 16:30
Last modified: 02 Aug 2023 01:44

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Contributors

Author: P. Andreakou
Author: S. Hands
Author: P. G. Lagoudakis ORCID iD

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