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Hand-Held Femtogram Detection of Hazardous Picric Acid with Hydrophobic Ag Nanopillar SERS Substrates and Mechanism of Elasto-Capillarity
RISE - Research Institutes of Sweden, Bioscience and Materials, Chemistry, Materials and Surfaces. Chalmers University of Technology, Sweden.
University of Science & Technology of China, China.
Swedish Defense Research Agency FOI, Sweden ; Uppsala University, Sweden.
Swedish Defense Research Agency FOI, Sweden ; .
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2017 (English)In: Sensors, ISSN 1424-8220, E-ISSN 1424-8220, Vol. 2, no 2, p. 1998-202Article in journal, Letter (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2017. Vol. 2, no 2, p. 1998-202
Keywords [en]
elasto-capillarity; flexible hot-spots; hydrophobic Ag nanopillars; molecular dynamics simulations; picric acid; SERS
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-31222DOI: 10.1021/acssensors.6b00749OAI: oai:DiVA.org:ri-31222DiVA, id: diva2:1139143
Available from: 2017-09-06 Created: 2017-09-06 Last updated: 2017-09-06Bibliographically approved

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