Construction Of Bifunctional Nanostructures

Long Fe₃O₄ nanowires decorated by CdTe quantum dots were synthesized through solvothermal treatment.The morphology,structure,and composition of the composite nanowires were characterized by means of the XRD,TEM,FESEM,PL,and VSM.The as-prepared nanostructure retains not only the good ferromagnetism of Fe₃O₄ but also the strong photoluminescence effect of CdTe QDs.With a self-organization method,we successfully prepared porous ZnS/ZnO composite microspheres in a large scale and studied their application as supports of CdTe quantum dots.The microspheres were characterized by means of XRD,TEM,FESEM,and PL.CdTe quantum dots were introduced into the nanopores to achieve luminescent microspheres.And it is expected that,besides semiconducting quantum dots,other functional units,such as magnetic and catalytically activated nanoparticles,can also be introduced into them.Polycrystalline ZnO/ZnS nanoribbons decorated byγ-Fe₂O₃ clusters were synthesized by a two-step,solution-based method.The growth of the nanoribbons is clarified to be dominated by a dissolution-reconstruction mechanism.The morphology,structure, composition,optical and magnetic properties of the nanoribbons were characterized by means of XRD,TEM,HRTEM,PL,and VSM.The composite nano-ribbons have integrated the photoluminescent effect of ZnO and ZnS and the ferromagnetism ofγ-Fe₂O₃. The effects of mineralizer and reaction time on the shape of the products were investigated in detail.We overcome the defect of the single component nanocrystal because of their limited component.As-prepared nano-composite is not only better than the single material but also it has the unique capability which single component hasn't.As new type of structural,functional material,composite nanomaterials are studied widely,and they have drawn intense attention of researchers because of their wide application in the optical, electrical,and magnetic fields.Along with the maturity of academic system,and the perfect of the preparation technique,composite nanomaterials will become the leader of the material field.