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Many attempts have been made to explore Fe3O4 nanoparticles （NPs） withsuperparamagnetic as the starting material to construct nanocrystals with a core-shell structure,due to their multiple potential applications in magnetic resonance imaging （MRI）, magneticrecording devices, magnetically guided drug delivery, thermal therapy and magneticseparation.Herein, a facile synthetic route to the preparation of Fe3O4@GNSs possessingmagnetization and tunable optical properties from visible to near-infrared （NIR） region atroom temperature.The resulting Fe3O4@GNSs described here show well catalytic activity forthe reduction of potassium ferricyanide as a model reaction. Importantly, the catalyst,Fe3O4@GNSs, can be easily recycled with an external magnet and exhibits long-life, goodreusability and stability. Additionally, in this thesis, the synthesis and property of Cu2O wereinvestigated.Cu2O nanocubes with equirotal grains,equirotal grains,stable characterization andFe3O4 cores have been successfullu fabricated by solution-phase reducing and a seededgrowth method .The Fe3O4@Cu2O Nanocubes was used to research on the photocatalysisperformance,and will degrade the object to decide the organic dyestuffas methyl blue as theindicator.The Fe3O4@Cu2O Nanocubes made by ourselves will play an import role in thedegeneration of methyl blue under visible light.Importantly, the catalyst, Fe3O4@Cu2ONanocubes, can be easily recycled with an external magnet, and long-life and good reusabilityusing an external magnetic field are demonstrated.The characterization method used here aretransmission electron microscopy （TEM）, scanning electron microscopy （SEM）, UV-Visspectrophotometer, and etc.
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