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. 2021 Feb 15;1233:130100. doi: 10.1016/j.molstruc.2021.130100

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Fig. 3 — Optical image of the laser-induced sunlight sterilized reusable graphene mask, schematics of the chemical modulation layer of the air filtration mechanism, an electret filter consists of carbon charged particles attributes as ultra-thin layered surface matrix and magnesium stearate as the charge enhancer as well as air-moisture induced electricity from gradient graphene.(Copyright © Ming Hui Chua et al. 2020, Exclusive Licensee Science and Technology Review Publishing House).