Preparation And Characterization Of Rare Earth Sulfide Low-dimensional Nanomaterials Via Electrospinning Technique

Rare earth sulfides have important applications in the fields of environmental-friendly pigments, thermoelectric materials and ceramics owing to their diverse structures and unique physical and chemical properties. Properties of rare earth sulfides have changed when they are prepared into nanoscaled materials. These rare earth sulfides will possess important applications in optics, electricity, magnetism and pigments, especially in thermoelectric materials. In order to study the properties of rare earth sulfides, preparation techniques of rare earth sulfides nanofibers and nanobelts are imperatively needed. Electrospinning is the best choice to prepare one-dimensional nanometer materials in recent years owing to its simplicity and reproducibility.In this dissertation, a series of PVP/inorganic salts composite nanofibers and nanobelts were fabricated by electrospinning method, and Y2O3nanofibers and nanobelts. Y2O3:Eu3+nanofibers and nanobelts. La2S3nanofibers, Gd2S3nanofibers. LaFeO3naonfibers could be acquired by calcination of the relevant PVP/inorganic salts composite nanofibers and nanobelts at700℃. For the first time, Y2S3nanofibers and nanobelts. Y2S3:Eu3+nanofibers and nanobelts. La2Fe2S5submicro-sized rods have been successfully prepared by sulfurization of the Y2O3nanofibers and nanobelts. Y2O3:Eu3+nanofibers and nanobelts. La2O3nanofibers. Gd2O3nanofibers and LaFeO3naonfibers using carbon disulfide(CS2) as sulfur resource, respectively.The as-prepared samples were characterized by XRD, SEM, EDS and broadband dielectric spectrometer. The results show that the structures of the prepared Y2S3nanofibers and nanobelts, Y2S3:Eu3+nanofibers and nanobelts were monoclinic with space group P21/m. Diameters of these fibers were70-300nm. Widths of these nanobelts are2-10μm, the thickenss of these nanobelts were150-300nm. This research lays a solid foundation for further study of rare earth sulfides one-dimensional nanomaterials.