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Picric acid (PA) is a severe environmental and security risk due to its unstable, toxic, and explosive properties. It is also challenging to detect in trace amounts and in situ because of its highly acidic and anionic character. Here, we assess sensing of PA under nonlaboratory conditions using surface-enhanced Raman scattering (SERS) silver nanopillar substrates and hand-held Raman spectroscopy equipment. The advancing elasto-capillarity effects are explained by molecular dynamics simulations. We obtain a SERS PA detection limit on the order of 20 ppt, corresponding attomole amounts, which together with the simple analysis methodology demonstrates that the presented approach is highly competitive for ultrasensitive analysis in the field.
Original languageEnglish
JournalACS Sensors
Volume2
Issue number2
Pages (from-to)198-202
Number of pages5
ISSN2379-3694
DOIs
StatePublished - 2017
CitationsWeb of Science® Times Cited: 2

    Keywords

  • SERS, Picric acid, Elasto-capillarity, Hydrophobic ag nanopillars, Flexible hot-spots, Molecular dynamics simulations
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