Fig. 2. Presence of the Fe-SCO within the SWCNT.

a Bright-field scanning transmission electron microscope (BF-STEM) image of one SCO1@SWCNT sample (acceleration voltage 80kV). Scale bar: 10 nm. b High-angle annular dark-field (HAADF)-STEM image of the SCO1@SWCNT depicted in a. Scale bar: 10 nm. c Amplified section of b. Scale bar: 5 nm. d Average electron energy loss spectra (EELS) measured across the turquoise and magenta lines in c.