Figure 4
STEM image and tomography slices of a magnetosome chain before and after oxidation at 300 °C. Before: (A) BF-STEM image. Tomography performed in HAADF-STEM mode from −55.5° to +55.5° with a step of 1.5° and acquisition magnification of 800.000X. (B,C) Slices extracted from the reconstructed volume at two different depths. After: (D) BF-STEM image. Tomography performed in the same conditions as previously. (E) and (F) Slices extracted from the reconstructed volume at two different depths. The dotted ellipses in red surround nanopores formed at the interfaces between magnetite nanocrystals. The arrows point to the presence of a significant roughness at the external faces of the magnetosome.
