Fluorescent Detection Techniques for Phosgene Gas
Summary
Phosgene is a colourless, highly toxic gas whose rapid and reliable detection is critical for industrial safety, environmental monitoring and public security. Fluorescent detection techniques employ small-molecule probes that react with phosgene to produce a distinct fluorescence signal, enabling real-time, highly sensitive monitoring in both solution and gas phases. Key strategies include chemodosimetric sensors that undergo irreversible chemical transformations, molecular platforms offering multiplexed responses to diverse chemical warfare agents, and portable test strips or kits incorporating fluorescent reagents. Mechanistic approaches such as Intramolecular Charge Transfer (ICT), Excited-State Intramolecular Proton Transfer (ESIPT) and the generation of fluorescent adducts have delivered detection limits in the nanomolar range, rapid response times of a few seconds, and robust selectivity against common interferents. Recent work focuses on enhancing probe stability, lowering limits of detection, integrating portable read-out devices and broadening applicability to field deployments.
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Fluorescent Detection Techniques for Phosgene Gas publication trend
The graph below shows the total number of articles in fluorescent detection techniques for phosgene gas across all publications each year (not limited to Nature Index journals).
Technical terms
Fluorescence: Emission of light by a molecule when it returns from an excited electronic state to its ground state.
Chemodosimeter: A sensor that undergoes an irreversible chemical reaction with an analyte, producing a definitive signal.
Intramolecular Charge Transfer (ICT): An electronic transition in which an excited electron shifts from a donor to an acceptor region within a single molecule, altering fluorescence.
Excited-State Intramolecular Proton Transfer (ESIPT): A process in which an excited molecule transfers a proton internally, leading to characteristic emission properties used for ratiometric sensing.
Limit of Detection (LoD): The lowest concentration of an analyte that can be distinguished reliably from the background signal.
BODIPY: Boron-dipyrromethene, a class of fluorescent dyes prized for high photostability and tunable emission wavelengths.
References
- Benzo[1,2-b:6,5-b’]dithiophene-4,5-diamine: A New Fluorescent Probe for the High-Sensitivity and Real-Time Visual Monitoring of Phosgene. Sensors (2025).
- A molecular recognition platform for the simultaneous sensing of diverse chemical weapons. Chemical Science (2022).
- An amino-substituted 2-(2′-hydroxyphenyl)benzimidazole for the fluorescent detection of phosgene based on an ESIPT mechanism. RSC Advances (2021).
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