Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 267, Issue -, Pages 457-466Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2018.04.058
Keywords
SERS; Neurotoxic agents; Gas phase; Real time detection; Sub-ppm limit of detection; Facile and reproducible fabrication
Funding
- MICINN [CTQ2013-49068-C2-1-R, CTQ2016-79419-R]
- CUD [UZCUD2016-TEC-07]
- VI National RAMP
- DAMP
- i Plan2008-2011 - Instituto de Salud Carlos III
- European Regional Development Fund
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A surface-enhanced Raman scattering (SERS)-based sensor was developed for the label-free real-time gas phase detection of dimethyl methylphosphonate (DMMP); a surrogate molecule of the G-series nerve agents which are of particular concern due to its extreme toxicity, persistence and previous deployment. The SERS platform was designed using simple elements (Au nano-particles) coated with a citrate layer, and a self-assembly procedure that yields near- optimum distances among the nanoparticles. The citrate coating acts as an effective trap of the target molecules on the immediate vicinity of the Au nanoparticle surface under ambient conditions by reversible hydrogen bonding type interactions. For the first time, we have been able to detect sub-ppm concentrations of DMMP in gas phase (130 parts-per-billion), as might be found on potential emergency scenarios. The high sensitivity, simple preparation and reusability of the SERS platforms developed in this work open up the way for immediate detection of chemical warfare agents in realistic scenarios. (C) 2018 Elsevier B.V. All rights reserved.
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