Figure 6.
XPS spectra of the as-obtained Fe3O4, Fe3O4-Au 5 mL, Fe3O4-Au 20 mL, Fe3O4-Au 40 mL and Fe3O4-Au 60 mL: the Fe 2p binding energies (a); the Au 4f binding energies (b); the O1s binding energies (c) and XPS survey spectra (d).
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