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TEM images and CLSM images of Fe3O4@ SiO2@C with core–shell structure, Fe3O4@hmC with yolk–shell structure after incubated with 4T1 cells for various durations (A). Cellular uptake percentage of Fe3O4@ SiO2@C and Fe3O4@hmC after being co-cultured with 4T1 cells for different durations (B). Cell viability (C) and fluorescence images (D) of live/dead cells after different treatments of PBS, DOX, Fe3O4@hmC-DOX and Fe3O4@hmC-DOX with 808 nm laser.
