title: Wireless Hazard Badges to Detect Nerve-Agent Simulants.
abstract: Human exposure to hazardous chemicals can have adverse short- and long-term health effects. In this Communication, we have developed a single-use wearable hazard badge that dosimetrically detects diethylchlorophosphate (DCP), a model organophosphorous cholinesterase inhibitor simulant. Improved chemically actuated resonant devices (CARDs) are fabricated in a single step and unambiguously relate changes in chemiresistance to a wireless readout. To provide selective and readily manufacturable sensor elements for this platform, we developed an ionic-liquid-mediated single walled carbon nanotube based chemidosimetric scheme with DCP limits of detection of 28 ppb. As a practical demonstration, an 8 h workday time weighted average equivalent exposure of 10 ppb DCP effects an irreversible change in smartphone readout.
authors.affiliation: Department of Chemistry and Institute for Soldier Nanotechnologies, Massachusetts Institute of Technology, Cambridge, MA, USA.
authors.forename: Rong
authors.initials: R
authors.lastname: Zhu
authors.affiliation: Department of Chemistry and Institute for Soldier Nanotechnologies, Massachusetts Institute of Technology, Cambridge, MA, USA.
authors.forename: Joseph M
authors.initials: JM
authors.lastname: Azzarelli
authors.affiliation: Department of Chemistry and Institute for Soldier Nanotechnologies, Massachusetts Institute of Technology, Cambridge, MA, USA. tswager@mit.edu.
authors.forename: Timothy M
authors.identifier: 0000-0002-3577-0510
authors.initials: TM
authors.lastname: Swager
keywords: carbon nanotubes; dosimeter; ionic liquids; nerve agents; sensors