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.

Sensor Technologies Empowered by Materials and Molecular Innovations

“…Thes implicity of ac hemiresistor offers clear advantages and allows for the easy fabrication of sensor arrays or integration into radio-frequencyi dentification technologies. [33] As shown in Figure 11, arrays can be easily printed on flexible substrates and these materials can be used to detect alkenes for the monitoring of produce ripening, [34] or biogenic amines for monitoring the quality of meat. [35] When the signals are sufficiently large,SWCNT sensor compositions can be used to create smartphone-compatible RFID sensors.…”

Challenges in Fluorescence Detection of Chemical Warfare Agent Vapors Using Solid‐State Films

“…Only very few reports have considered the issue of acid impurities in their sensing measurements. For example, in one case, an acid scavenger, poly(4‐vinylpyridine) (PVP) was added to DCP immediately before the sensing measurement, and in a second report, piperidinomethyl polystyrene (PDN‐PS) was added to DFP for storage and removal of HF . The former was used in a chemiresistor with an ionic liquid for the detection of DCP and the latter was used in solution‐based detection of DFP.…”

“…Nerve agents are odorless and colorless when pure and development of detection technologies that can meet the needs of military, first responders (national security), healthcare, and environmental monitoring agencies is a continuing challenge. A variety of detection methods have been developed including mass spectrometry, enzyme‐based biosensors, chemiresistors, and microcantilever, and surface acoustic wave sensors . These detection systems are either slow, complex, nonselective, or the equipment is too cumbersome for field use.…”

Sensortechnologien durch neuartige Materialien und Moleküle

“…Die Einfachheit der Chemiresistoren bietet klare Vorteile und ermöglicht die einfache Herstellung von Sensormatrizen oder die Integration in RFID‐Transponder (radio‐frequency identification) . Wie in Abbildung gezeigt ist, können diese Matrizen leicht auf flexible Substrate gedruckt werden, und diese Sensoren können beispielsweise zum Nachweis von Alkenen zur Beobachtung der Reifung von Früchten oder von biogenen Aminen zur Überprüfung des Verderbens von Fleisch verwendet werden .…”