Preparation And Characterization Of Rare Earth Ions-doped Lanthanum Hydroxide Nanofibers By Electrospinning

Nanofibers have attracted much attention due to their superior optical, acoustic, electrical, magnetic, thermal and mechanical properties, they have become one of the popular subject in the field of nanoscience and nanotechnology. Rare earth compound luminescent materials have been used in many high-tech fields. Preparation, properties and applications of these compounds have become an important research subject.In this dissertation, electrospinning technique was successfully used to fabricate P VP/La(NO₃)₃,PVP/[La(NO₃)₃+Tb(NO₃)₃],PVP/[La(NO₃)₃+Ce(NO₃)₃] and PVP/[La(NO₃)₃+ Eu(NO₃)₃] composite nanofibers.La(OH)₃,La(OH)₃:Tb³⁺,La(OH)₃:Ce³⁺ and La(OH)₃:Eu³⁺ crystalline rare earth hydroxide luminescent nanofibers were obtained by calcination of the relative composite nanofibers. The technique offered a new route to preparatio n of one-dimensional nanoscaled luminescent materials.The morphology of fibers was discussed by adjusting all the important parameters such as concentration of polymer, voltage, distance between tip and collector, the mass of metallic salts added to the sol. The optimum preparation technological parameters of the polymer/inorganic salts composite fibers were acquired. The samples were characterized by scanning electron microscope(SEM), X-ray diffraction(XRD), thermal analysis(TG-DTA) and fluorescence spectrophotometer. All the results showed that the prepared polymer/inorganic salts composite fibers and La(OH)₃, La(OH)₃:Tb³⁺,La(OH)₃:Ce³⁺ and La(OH)₃:Eu³⁺ nanofibers were good one-dimensional nanofibers. The diameters of the luminescent nanofibers were ca.100nm, and La(OH)₃:Tb³ luminescent nanofibers possessed excellent emission spectra. Some new meaningful results have been achieved, and laid a foundation for further study of luminescent nanofibers.