Preparation of black phosphorus coatings with photo-thermal conversion properties

Black phosphorus (BP) is a semiconductor material with excellent optical properties. To explore a more convenient method for preparation bulk BP and facilitate new applications of BP in engineering field, we used a single-zone tube furnace to fabricate bulk BP using tin and iodine as mineralisers. Further, a BP slurry with a uniform particle size was prepared by cutting the bulk BP in a solvent. BP coatings with different thicknesses were prepared, and their photo-thermal conversion properties were evaluated. The characterisation and test results showed that the BP coating was superimposed by BP flakes with an estimated plane size of ∼10 μm. The infrared absorptivity of the BP coatings was 87.83%–92.48%. The results clearly indicated that the BP coatings exhibit photo-thermal conversion properties that can be exploited for various applications. (paper)