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Functional composite microspheres with porous Fe3O4 cores and hierarchical MnO2 shells have been synthesized successfully via a two-step hydrothermal method. X-ray diffraction was employed to determine the crystal forms of samples. The morphologies and microstructures of Fe3O4 nanoparticles and Fe3O4@MnO2 composite microspheres were observed by the scanning electron microscope and transmission electron...
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