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Synthesis and characterization of ceria nanoparticle. A The synthetic procedure of CeNP and CeNP-PEG. Representative high-resolution TEM image of CeNP (B) and CeNP-PEG (C). The SAED (D) and XRD (E) patterns of CeNP indicated a pure and typical cubic fluorite structure. F XPS spectrum of Ce3d revealed the valence state and the corresponding binding energy peaks of Ce (III) (884.8 and 902.9 eV) and Ce (IV) (882.1, 888.5, 898.1, 900.6, 907.2, and 916.4 eV). a.u.: arbitrary units
