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Hand-Held Femtogram Detection of Hazardous Picric Acid with Hydrophobic Ag Nanopillar SERS Substrates and Mechanism of Elasto-Capillarity

Aron Hakonen (Institutionen för fysik, Bionanofotonik (Chalmers)) ; F. C. Wang ; P. O. Andersson ; H. Wingfors ; T. Rindzevicius ; M. S. Schmidt ; V. R. Soma ; S. C. Xu ; Y. Q. Li ; A. Boisen ; H. A. Wu
Acs Sensors (2379-3694). Vol. 2 (2017), 2, p. 198-202.
[Artikel, refereegranskad vetenskaplig]

Picric acid (PA) is a severe environmental and security risk due to its unstab e, 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 handheld 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.

Nyckelord: SERS, picric acid, elasto-capillarity, hydrophobic Ag nanopillars, flexible hot-spots, molecular dynamics, enhanced raman-spectroscopy, metal-organic framework, highly selective, detection, charged silver nanoparticles, sensitive detection, aqueous-solution, 2,4,6-trinitrophenol tnp, inorganic explosives, molecular-dynamics, conjugated polymer, Chemistry, Science & Technology - Other Topics, iles sm, 1986, physical review b, v33, p7983



Denna post skapades 2017-05-12.
CPL Pubid: 249283

 

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