Fig. 2

XPS spectra of a iron, b oxygen, and c nitrogen from Fe₃O₄@Chl/Fe CNPs. d The percentage of Chl weight loss from TGA and Fe/N mass ratios from XPS analysis for different Fe₃O₄@Chl/Fe_{[0−200 mg]} CNPs. e FTIR absorbance spectra of Chl/Fe, Fe₃O₄ and Fe₃O₄@Chl/Fe CNPs. f UV–Vis spectra of Chl/Fe and Fe₃O₄@Chl/Fe_{[0−200 mg]} CNPs. g Fluorescence spectrum at 435 nm. h Fluorescent image at 365 nm of Fe₃O₄@Chl/Fe_{[0−200 mg]} CNPs. i TGA measurement of the Fe₃O₄@Chl/Fe_{[5−200 mg]} CNPs