| In recent years,ZnO nanoparticles have become powerful candidates for photocatalysts due to their adjustable band gap and high electron density.However,due to the rapid recombination of photogenerated electron holes in pure ZnO nanoparticles and the poor absorption of visible light,the photocatalytic performance is greatly reduced.The appearance of graphene brings a new dawn to the photocatalysis of zinc oxide.Its superior carrier mobility can effectively increase the transfer path of photogenerated electrons and the absorption of visible light in zinc oxide nanoparticles.However,previous research work has combined graphene oxide and zinc oxide quantum dots into composite materials,The edge of graphene oxide has a large number of oxygen-bonded groups,which greatly deteriorated the carrier mobility of graphene,and it is adverse to photocatalytic reaction of materials.Based on this point,this work used non-oxidized graphene instead of graphene oxide,which optimizing the conductivity of the electron transporting materials to obtain a photocatalyst with higher catalytic activity,and the synthesis methods of zinc oxide quantum dots,graphene and molybdenum disulfide nanomaterials were studied,and the photocatalytic properties of the three material composites were studied.1.Using the most advanced chemical vapor deposition system?CVD?,a single-layer graphene film and a graphene single crystal with controlled size and shape were synthesized on the surface of the copper foil.The growth conditions were studied for graphene single.The morphology and properties of the crystal.the conventional liquid phase exfoliation method was used to prepare the graphene nanosheet dispersion,and the graphene nanosheet dispersion with higher single layer rate was obtained.2.A single layer of single crystal molybdenum disulfide film and flake MoS2/MoO3/MoS2 nanomaterials were formed on the surface of SiO2/Si substrate by CVD method.The effects of different growth conditions on the morphology and properties of molybdenum disulfide were studied.Molybdenum disulfide nanosheets with a size of one hundred nanometers were prepared by liquid phase exfoliation method.3.The zinc oxide quantum dots were synthesized by hydrothermal method in one step.The effects of different ultrasonic conditions on the morphology of zinc oxide nanoparticles during the precipitation time and quantum dots extraction were studied.Finally,ZnO quantum dots with uniform size around 10 nm were prepared.4.Photocatalysts were prepared by using the three nanomaterials synthesized above.Firstly,ZnO/MoS2/Graphene ternary composite nanomaterials?ZMG?with heterostructure were formed.Secondly,the photocatalytic properties of zinc oxide were optimized using non-oxidized graphene nanosheets.Finally,The mechanism of the photocatalytic activity of the composite was discussed. |
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