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(a) Schematic of bulk BP used to synthesize black phosphorus quantum dots (BPQDs) in ethanol using a microwave (MW)-assisted technique. TEM images of intermediate BPQDs at different disintegrating times: (b) MW-1 at 11 min, (c) MW-2 at 5 min, (d) magnified image from (c), (e) MW-2 at 10 min, (f) MW-2 at 20 min, and (g) MW-2 at 30 min.
