Issue 32, 2019

Whisky tasting using a bimetallic nanoplasmonic tongue


Metallic nanostructures are ideal candidates for optical tongue devices thanks to their chemical stability, the sensitivity of their plasmonic resonance to environmental changes, and their ease of chemical-functionalization. Here, we describe a reusable optical tongue comprising multiplexed gold and aluminum nano-arrays: a bimetallic device which produces two distinct resonance peaks for each sensing region. Through specific modification of these plasmonic arrays with orthogonal surface chemistries, we demonstrate that a dual-resonance device allows us to halve sensor sizes and data-acquisition times when compared to single-resonance, monometallic devices. We applied our bimetallic tongue to differentiate off-the-shelf whiskies with >99.7% accuracy by means of linear discriminant analysis (LDA). This advance in device miniaturization, functionalization, and multiplexed readout indicates nanoplasmonic tongues will have future applications in chemical mixture identification in applications where portability, reusability, and measurement speed are key.

Graphical abstract: Whisky tasting using a bimetallic nanoplasmonic tongue

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Article information

Article type
29 May 2019
26 Jun 2019
First published
03 Jul 2019
This article is Open Access
Creative Commons BY license

Nanoscale, 2019,11, 15216-15223

Whisky tasting using a bimetallic nanoplasmonic tongue

G. Macias, J. R. Sperling, W. J. Peveler, G. A. Burley, S. L. Neale and A. W. Clark, Nanoscale, 2019, 11, 15216 DOI: 10.1039/C9NR04583J

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