Abstract
Fluorescent film sensors (FFSs) are a new generation of miniaturized high-performance analytical tools. Recently, Palma and coworkers reported a sensing platform consisting of a fluorescent CO<sub>2</sub> film sensor combined with a flexible, battery-less, near-field-enabled tag and the related custom smartphone application. The system enables non-invasive, wearable quantification of CO<sub>2</sub> in real time, laying a foundation for developing smart facemasks and potential applications in preclinical research and diagnostics.
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