Abstract
A porous halide perovskite–polymer nanocomposite is developed using a freeze‐drying process. Such a composite shows strong fluorescence quenching after exposure to explosive nitroaromatics, nitroamines, and nitrate esters with a sensitivity of a few nanograms. In addition, this composite is robust against moisture and solvents, showing negligible change in fluorescence intensities after submersion in water, alcohol, and acid, base, and salt solutions. Transient absorption spectroscopy studies further disclose that the explosive chemical introduces more trap states into the perovskite that contributes to fluorescence quenching of the perovskite.
Porous halide perovskite–polymer nanocomposite foam is developed through a freeze‐drying process. This nanocomposite exhibits strong photoluminescence under UV excitation. Fluorescence quenching of the foam is observed with a sensitivity of a few nanograms after contacting to common explosives including nitroaromatics, nitroamines, and nitrate esters. The nanocomposite foam is found not responsive to water, alcohol, and common acid, base, and salt solutions.
