Hand-Held Femtogram Detection of Hazardous Picric Acid with Hydrophobic Ag Nanopillar SERS Substrates and Mechanism of Elasto-Capillarity
Journal article, 2017
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.
aqueous-solution
p7983
elasto-capillarity
molecular-dynamics
hydrophobic Ag nanopillars
molecular dynamics
1986
6-trinitrophenol tnp
metal-organic framework
enhanced raman-spectroscopy
conjugated polymer
charged silver nanoparticles
SERS
sensitive detection
highly selective
inorganic explosives
Science & Technology - Other Topics
4
v33
picric acid
detection
flexible hot-spots
2
physical review b
Chemistry
iles sm
Author
Aron Hakonen
Chalmers, Physics, Bionanophotonics
F. C. Wang
University of Science and Technology of China
Per-Ola Andersson
Swedish Defence Research Agency (FOI)
Uppsala University
H. Wingfors
Swedish Defence Research Agency (FOI)
Tomas Rindzevicius
Technical University of Denmark (DTU)
M. S. Schmidt
Technical University of Denmark (DTU)
V. R. Soma
University of Hyderabad
S. C. Xu
Dezhou University
Y. Q. Li
University of Science and Technology of China
A. Boisen
Technical University of Denmark (DTU)
H. A. Wu
University of Science and Technology of China
ACS Sensors
23793694 (eISSN)
Vol. 2 2 198-202Subject Categories
Polymer Chemistry
Atom and Molecular Physics and Optics
Driving Forces
Sustainable development
DOI
10.1021/acssensors.6b00749