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Characterization of materials and evaluation of maximum peptide ligand density. (a) XPS survey data of Fe3O4@NiFe LDH, Fe3O4@NiFe LDH@HN19 and Fe3O4@NiFe LDH@HE24. High-resolution XPS spectra of (b) Ni on Fe3O4@NiFe LDH@HN19 and (c) Ni on Fe3O4@NiFe LDH@HE24. (d) Maximum HN19 density on Fe3O4@NiFe LDH@HN19. (e) Maximum HE24 density on Fe3O4@NiFe LDH@HE24. (f) Size distribution histogram of Fe3O4@NiFe LDH@peptide.
