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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, Biovetenskap och material, Kemi och material. Chalmers University of Technology, Sweden.
University of Science and Technology of China, China.
FOI Swedish Defense Research Agency, Sweden; Uppsala University, Sweden.
FOI Swedish Defense Research Agency, Sweden.
Vise andre og tillknytning
2017 (engelsk)Inngår i: Sensors, ISSN 1424-8220, E-ISSN 1424-8220, Vol. 2, nr 2, s. 1998-202Artikkel i tidsskrift, Letter (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
2017. Vol. 2, nr 2, s. 1998-202
Emneord [en]
elasto-capillarity; flexible hot-spots; hydrophobic Ag nanopillars; molecular dynamics simulations; picric acid; SERS
HSV kategori
Identifikatorer
URN: urn:nbn:se:ri:diva-31222DOI: 10.1021/acssensors.6b00749Scopus ID: 2-s2.0-85021680812OAI: oai:DiVA.org:ri-31222DiVA, id: diva2:1139143
Tilgjengelig fra: 2017-09-06 Laget: 2017-09-06 Sist oppdatert: 2019-02-05bibliografisk kontrollert

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