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Figure 2
XPS spectra of the black substance collected from the cracked area. The survey scans were measured at a photon energy of (a) 600 eV, (b) 500 eV and (c) 400 eV. |
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Figure 2
XPS spectra of the black substance collected from the cracked area. The survey scans were measured at a photon energy of (a) 600 eV, (b) 500 eV and (c) 400 eV. |