Fig. 7 Fluorescence enhancement response and dual-mode detection of FA by NCQDs. （a） Fluorescence emission spectra of NCQDs solution with increasing FA concentrations; (b) the quantitative relationship between fluorescence intensity and FA concentration; （c） fluorescence lifetime decay curves of NCQDs before and after reaction with FA；（d） schematic diagram of the NCQDs/PVA composite film for FA gas sensing；（e~g） fluorescence microscope images of the film under ambient air, water vapor, and FA gas；（h）fluorescence reversibility upon switching from FA gas back to air environmen[79]
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