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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.
Uppsala University, Sweden ; Swedish Defense Research Agency FOI, Sweden.
Swedish Defense Research Agency FOI, Sweden.
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2017 (English)In: ACS Sensors, ISSN 2379-3694, Vol. 2, no 2, 198-202 p.Article in journal (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, 198-202 p.
Keyword [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-31030DOI: 10.1021/acssensors.6b00749Scopus ID: 2-s2.0-85021680812OAI: oai:DiVA.org:ri-31030DiVA: diva2:1138219
Note

 Funding details: 11572307, NSFC, National Natural Science Foundation of China; Funding text: A.H. and P.O.A. acknowledge support from the Swedish Foundation for Strategic Research (project RMA11-0037 and FOI project 410-E4272). F.C.W., Y.Q.L. and H.A.W. acknowledge support from the National Natural Science Foundation of China (11572307). T.R. and M.S.S. acknowledge support from the Danish National Research Foundation (DNRF122) and Villum Fonden (Grant No. 9301).

Available from: 2017-09-04 Created: 2017-09-04 Last updated: 2017-09-04Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
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More styles
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  • en-GB
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