Fig. 1From: Double-activation of mitochondrial permeability transition pore opening via calcium overload and reactive oxygen species for cancer therapya TEM image of FeCOF. b Schematic diagram of synthesis method of FeCOF@CaCO3. c TEM image and (d) elemental mapping of FeCOF@CaCO3. e TEM image of FCCF. f FTIR spectra of FA, FeCOF@CaCO3 and FCCF. g UV–vis absorption spectra of FeCOF, FeCOF@CaCO3, FA and FCCFBack to article page