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      Whisky tasting using a bimetallic nanoplasmonic tongue

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          Abstract

          In this paper, we present a bimetallic nanoplasmonic tongue capable of distinguishing between a variety of commercial whiskies.

          Abstract

          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.

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          Most cited references41

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          Gold nanoparticles in chemical and biological sensing.

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            Plasmonics: Fundamentals and Applications

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              Analysis of discrimination mechanisms in the mammalian olfactory system using a model nose.

              Olfaction exhibits both high sensitivity for odours and high discrimination between them. We suggest that to make fine discriminations between complex odorant mixtures containing varying ratios of odorants without the necessity for highly specialized peripheral receptors, the olfactory systems makes use of feature detection using broadly tuned receptor cells organized in a convergent neurone pathway. As a test of this hypothesis we have constructed an electronic nose using semiconductor transducers and incorporating design features suggested by our proposal. We report here that this device can reproducibly discriminate between a wide variety of odours, and its properties show that discrimination in an olfactory system could be achieved without the use of highly specific receptors.
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                Author and article information

                Journal
                NANOHL
                Nanoscale
                Nanoscale
                Royal Society of Chemistry (RSC)
                2040-3364
                2040-3372
                2019
                2019
                Affiliations
                [1 ]School of Engineering
                [2 ]University of Glasgow
                [3 ]Glasgow
                [4 ]UK
                [5 ]School of Chemistry
                [6 ]WestCHEM & Department of Pure & Applied Chemistry
                [7 ]University of Strathclyde
                Article
                10.1039/C9NR04583J
                31384879
                b42513ca-ff41-4281-9bc1-f967571ec607
                © 2019

                http://creativecommons.org/licenses/by/3.0/

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