Fig. 3From: Comparison Between Folic Acid and gH625 Peptide-Based Functionalization of Fe3O4 Magnetic Nanoparticles for Enhanced Cell InternalizationXPS characterization of functionalized MNPs. High-resolution P 2p, C 1s, and N 1s XPS spectral regions of a) NH2@MNPs, b) PEG,FA@MNPs, and c) gH625@MNPsBack to article page