Fig. 1
From: Research progress on black phosphorus hybrids hydrogel platforms for biomedical applications
(a): image of bulk BP crystal; (b) Perspective side view of multi-layer BP; (c) Top and side views of single-layer phosphorene where ‘a’ and ‘b’ represent lattice parameters; (c) A representation of the arrangement of atomic structures, illustrating dihedral/hinge angles and bond lengths, where different colored P atoms in each image represent P atoms in different planes. Reproduced with permission from Ref [16]. 2019IOP Publishing Ltd. All rights reserved.