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705 710 715 720 725

Binding energy (eV)

705 710 715 720 725

Binding energy (eV)

Figure 15. X-ray photoelectron (XPS) spectra of Fe(C) nanocapsules produced in methane at 13.3 kPa. Solid curves are fitted to experimental data (dots). After [113], X. L. Dong et al., J. Mater. Sci. 33, 1915 (1998). © 1998, Kluwer Academic.

Figure 16. (a) Fe2p3/2, (b) Co2p3/2 and (c) O 1s XPS spectra of as-prepared Fe-Co(C) nanocapsules and their surface cleaned samples. Solid curves are fitted to experimental data (dots). After [120], X. L. Dong et al., J. Appl. Phys. 86, 670l (1999). © 1999, American Institute of Physics.

find whether the atoms in the core are oxided, whether all particles are coated completely by the shells, and whether moisture absorbs on the surface of the nanocapsules.

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