Fig. 5
XPS survey spectrum (a) and high-resolution XPS spectra of Fe 2p (b), Ni 2p (c), O 1Â s (d) of hollow mesoporous NiFe2O4 nanospheres
Fig. 5 | Cancer Nanotechnology
XPS survey spectrum (a) and high-resolution XPS spectra of Fe 2p (b), Ni 2p (c), O 1Â s (d) of hollow mesoporous NiFe2O4 nanospheres