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Issue 20, 2014
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Superhydrophobic bull's-eye for surface-enhanced Raman scattering

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We present a micro-patterned silicon structure that enables the preparation of a substrate for surface-enhanced Raman scattering (SERS) and pre-concentration of the analyte molecules. The structure is designed to produce a hydrophobicity gradient. As a result, a water droplet placed on it will remain centred on the structure as it dries, enabling delivery of materials to its centre. The structure is therefore referred to as a superhydrophobic bull's-eye. A water droplet containing gold colloids placed on it dries to produce a cluster at the bull's-eye centre. A second water droplet placed on it, this time containing analyte molecules, dries such that the molecules are delivered to the gold colloid cluster. We demonstrate the detection of molecules at low concentrations (Rhodamine 6G at 10−15 M) from small droplets.

Graphical abstract: Superhydrophobic bull's-eye for surface-enhanced Raman scattering

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The article was received on 22 Apr 2014, accepted on 04 Aug 2014 and first published on 04 Aug 2014

Article type: Communication
DOI: 10.1039/C4LC00477A
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Lab Chip, 2014,14, 3907-3911

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    Superhydrophobic bull's-eye for surface-enhanced Raman scattering

    W. Song, D. Psaltis and K. B. Crozier, Lab Chip, 2014, 14, 3907
    DOI: 10.1039/C4LC00477A

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