fig2

Figure 2. (A) Schematic diagram of the synthesis route of Type II RP through a solvothermal method; (B) The XRD pattern and (C) SAED pattern of the prepared Type II RP. Reproduced with permission^[73]. Copyright 2022, Royal Society of Chemistry; (D) Crystallographic representation of the repeating [P9]P2[P8]P2 tubular unit in Type IV RP. Reproduced with permission^[77]. Copyright 2017, American Chemical Society; Linkage of the P strands and stacking of the layers in (E) fibrous RP and (F) Hittorf’s P. The blue tubes are added to emphasize the fibrous nature. Reproduced with permission^[75]. Copyright 2020, Royal Society of Chemistry; Band structure, total density of states, and partial density of states of (G) monolayer hittorfene and (H) bulk Hittorf’s P based on first-principles calculations. Reproduced with permission^[79]. Copyright 2016, American Chemical Society. XRD: X-ray diffraction; SAED: selected area electron diffraction; RP: red phosphorus; P: phosphorus.