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Characterization of cerium oxide nanoparticles. (a) Size of cerium oxide nanocrystal core by TEM. (b) Zeta potential of cerium oxide nanoparticles with different surface functionalities (negative, neutral and positive). (c) FT-IR spectra of the carboxylated (negative) and aminated (positive) surface group on nanoceria. (d) Fluorescence emission spectra of the DiI-encapsulating nanoceria and free dye DiI.
