Figure 1.

Preparation of GP-PGA-Fe₃O₄-CDs@BPQDs nanoplatform.

Notes: (A) Fabrication of the GP-PGA-Fe₃O₄-CD@BPQD nanoplatform; (B) TEM (a) and HRTEM (b) of BPQDs; (C) TEM (a) and HRTEM (b) of Fe₃O₄-CDs; (D) TEM of PGA-Fe₃O₄-CDs; (E) elemental mapping images of PGA-Fe₃O₄-CDs; (F) TEM of GP-PGA-Fe₃O₄-CDs@BPQDs; (G) lateral sizes of 50 GP-PGA-Fe₃O₄-CDs@BPQDs determined using TEM; (H) TEM showing the morphology of GP-PGA-Fe₃O₄-CD@BPQD assemblies and corresponding cross-linking degree of GP at different cross-linking times; (I) elemental mapping images of GP-PGA-Fe₃O₄-CDs@BPQDs assemblies after 3 hours of cross-linking.

Abbreviations: GP, genipin; PGA, polyglutamic acid; CD, carbon dot; BPQD, black phosphorus quantum dot; HRTEM, high-resolution transmission electron microscopy; NMP, N-methyl-2-pyrrolidone.