A Study On Preparation And Property Of Graphene/Rare Earth Oxides Composites

Graphene （GS） has got a lot of attentions according to its special mechanicalproperties, chemical properties, electrical conductivity and electrical properties sinceit is discovered. It is thought as potential and newly nanomaterials.Graphene is the name given to a flat monolayer of carbon atoms tightly packedinto a two-dimensional （2D） honeycomb lattice. Graphene nanoribbons have recentlyattracted attention because they are recognized as promising building blocks fornanoelectronic and spintronic devices in the carbon family. Herein, graphene/rareearth oxides nanocomposites have been first successfully synthesized via a simple,inexpensive, and fast methed. The as-prepared materials exhibited excellent electricaland optical properties, which opens up new ways for many applications ranging fromelectronic to optoelectronic systems.The experiment is divided into three parts:First, Eu₂O₃/graphene nanocomposites have been synthesized using graphite oxideand europium nitrate as precursor for graphene and europium oxide, respectively.Graphene coated by nanosized Eu₂O₃particles has been confirmed by scanningelectron microscopy and transmission electron microscopy analysis. Transmissionelectron microscopy analysis images illustrated that the as-formed Eu₂O₃nanoparticles were densely and uniformly deposited on the graphene nanosheets. Thegood distribution of Eu₂O₃nanoparticles on graphene nanosheets improved thethermal stability of Eu₂O₃/graphene namocomposites. A plausible mechanism forformation of the intriguing nanocomposite has been proposed. Moreover,Eu₂O₃/graphene nanocomposites exhibited both optical and electrical properties.These Eu₂O₃/graphene nanocomposites show potential applications in electronic andoptoelectronic systems.Second, The reduced graphene oxide（RGO）/europium-doped lanthanum oxide(La₂O₃:Eu³⁺) composites were used as modified electrode materials and theirphotoelectric properties were characterized by transmission electron microscopy（TEM） and scanning electron microscopy. TEM results confirmed graphene surfacehas been covered by La₂O₃:Eu³⁺nanoparticles and the as-synthesizedRGO/La₂O₃:Eu³⁺composites remain morphologies of graphene with numerous wrinkles. To study photoelectric properties, which has been zed. The surfacemorphologies of correlated with energy or electron transfer between graphene andLa₂O₃:Eu³⁺nanoparticles. Fluorescence spectra and amperometric i-t curves havebeen determined.Third，RGO/La₂O₃:Eu³⁺film was successfully prepared and their photoelectricproperties were characterized. Our results demonstrated the RGO/La₂O₃:Eu³⁺composites have potential applications in nanoscaled photodetectors and photoelectricswitches.