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TEM images of Fe3O4-COOH nano-particles (a), Fe3O4@SiO2 nanoparticles (b), CdTe QDs (c) and Fe3O4/ CdTe nano-composites (d, e). (e) is the enlarged view of the area highlighted by a red circle in (d) showing the presence of multiple tiny dots around an individual silica-coated iron oxide nanoparticle.
