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Issue 4, 2013
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Inkjet-printed paper-based SERS dipsticks and swabs for trace chemical detection

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Abstract

We demonstrate a paper-based surface swab and lateral-flow dipstick that includes an inkjet-printed surface-enhanced Raman spectroscopy (SERS) substrate for analyte detection. Due to capillary-action wicking of cellulose, the paper dipstick enables extremely simple and pump-free loading of liquid samples into the detection device, and in addition provides inherent analyte concentration within the detection volume. Furthermore, the flexible nature of the paper-based SERS device also enables it to act as a swab to collect analyte molecules directly from a large-area surface; the collected analyte molecules can then be focused into a small-volume SERS-active region by lateral-flow concentration. These capabilities are unseen in today's SERS substrates and microfluidic SERS devices. Using these novel lateral-flow paper SERS devices, we achieved detection limits as low as 95 fg of Rhodamine 6G (R6G), 413 pg of the organophosphate malathion, 9 ng of heroin, and 15 ng of cocaine. Moreover, the measurements show that the technique is quantitative and is repeatable across multiple swabs and dipsticks. The results reported here may lead to ultra-low-cost portable applications in trace chemical detection.

Graphical abstract: Inkjet-printed paper-based SERS dipsticks and swabs for trace chemical detection

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Publication details

The article was received on 13 Aug 2012, accepted on 13 Sep 2012 and first published on 13 Sep 2012


Article type: Paper
DOI: 10.1039/C2AN36116G
Citation: Analyst, 2013,138, 1020-1025
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    Inkjet-printed paper-based SERS dipsticks and swabs for trace chemical detection

    W. W. Yu and I. M. White, Analyst, 2013, 138, 1020
    DOI: 10.1039/C2AN36116G

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