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The morphological structure when using STEM as the material after surface functionalization and ELG loading. (A) The images were taken by TEM for pristine ZnO NPs, (B) ZnO NPs–NH2–COOH–TRP, and (C) ZnO NPs–NH2–COOH–TRP–ELG. (D) The images were taken by STEM for ZnO NPs, (E) ZnO NPs–NH2–COOH–TRP, and (F) ZnO NPs–NH2–COOH–TRP–ELG. The green lines show the coating shell layer, as indicated by TRP-functionalized nanoparticles.
