Fig. 3

Fabrication and characterization of the HAZ@Fu MNs. (A) Schematic illustration of the synthesis of a HAZ@Fu MN patch. (B) Isometric and tip-upward photographic images of a HAZ@Fu MN patch, along with the corresponding zoomed-in images (scale bar: 5 mm and 2 mm, respectively). (C) SEM images of the HAZ@Fu MN patch. (D) Cumulative release of Zn²⁺ from the HAZ@Fu MN patch. (E) SEM images of MRSA co-cultured with HAZ@Fu MN in PBS, arrows indicate distorted and disintegrated MRSA (scale bar: 500 nm). (F) TEM images of MRSA co-cultured with HAZ@Fu MN, Van MN and ZIF MN in PBS for 24 h, arrows indicate distorted and disintegrated MRSA (scale bar: 500 nm). (G) Force‒displacement curves of MNs with different compositions (inset: schematic diagram of the mechanical strength test). (H) The axial fracture forces of the different MNs. (I) ZOI test of different MNs against MRSA, red rectangle indicated the position of MNs