Synthesis And Optical Properties Of Metal Vanadate Nanoparticles

As the developing of nanometer technology,kinds of functional nanometer materials were synthetized by many researchers around the world.They try to solve the serious crisis of energy shortage and pollution by applying these materials,even to find some suitable materials to load the drug and realize targeted therapy.Some vanadate materials were intensively researched for its advance characteristics in biology,chemistry and physics,especially in fields of optic,electrochemistry and photocatalysis.With the advantage of low toxicity and photoluminescence intensity,designing a hollow structure would benefit the application in biology.For instance,the hollow sphere of(Y,Gd)VO4 doped with rare earth,have much application in upconversion photoluminescence imaging,NMR-imaging and pH-response drug deliver,when modified the surface with biomolecule,then absorbed by cell.The hollow structure of(GdF3,NaYF4):Yb3+,Er3+ also can be excited with infrared to achieve upconversion photoluminescence,and it has interesting potential in drug delivery system and treatment of cancer.Lithium vanadate and manganese vanadate hollow structure have high capacity of lithium ion in the field of electrode materials.To increase the specific surface of materials,like two dimension and nanoparticle,will enhance their photoluminescence and photocatalysis.Two dimension materials perform well in catalysis and electron,and can be enhanced some characteristics when combine with others.Hydrothermal method is always applied in synthesizing masses of nanomaterial for low expenses,biology compatibility.First,we prepared indium hydroxide template before synthesize indium vanadate through hydrothermal method.We find that nanorod and cube indium hydroxide can be synthesized by modified the ratio of indium ion and hexamethylenetetramine in solution,but nanosphere indium hydroxide will form while additionally add L-ascorbic acid.These three kinds of indium hydroxide would transform into particle,bipyramid and microsphere.Excited by ultraviolet light,indium vanadate has yellow light emission,even red light by doped europium ion.This method,sacrificing hydroxide to prepare vanadate,is called template-sacrifice method.Different morphology will appear after transformation.Second,bismuth vanadate,similar with indium vanadate,is an excellent inorganic coating.It can not only degrade organic pollution,but also kill malignant bacteria,even clear the air.Aiming to improving specific surface,we design to synthesis two dimension bismuth vanadate.For the existence of bismuthyl bromide,we added cetyl trimethyl ammonium bromide,potassium bromide or sodium bromide in preparation of bismuth vanadate.The bromide ion might inset between layers of bismuth vanadate,increasing the possibility of two dimension material formation.We discover that cetyl trimethyl ammonium bromide trigger the formation of two dimension material bismuth vanadate,while potassium bromide and sodium bromide contribute to form particle.Finally,we adopt a mature method to synthesize molybdenum sulfide and the compound with the experience of synthesizing two dimension material.We separately use sodium stannate and stannic chloride as stannum source and modified the ratio of stannum and molybdenum,then we prepared Sn02/MoS2 and SnS2/MoS2 compounds.The SnO2 nanoparticles distribute on the surface of MoS2,and SnS2 hexagonal disk layer-by-layer with MoS2.All the experiments require different pH solutions,so different stannum source are choosed.The two compounds specific surface area increase obviously.