Study On Electrospinning Fabrication Of La₂M₂O₇(M=Ti,Zr,Sn):RE³⁺ Nanobelts And Their Luminescent Properties

Low-dimensional nanomaterials are the basic component unit of devices and materials, which will play an important role in building integrated circuits and functional devices. The preparation and processing of low-dimensional nanomaterials have become key components in the field of nanotechnology. In recent years, electrospinning technology has been proved to be one of the effective methods to prepare inorganic oxides low-dimensional nanomaterials owing to its high efficiency, simple operation and so on. La2M2O7(M=Ti, Zr, Sn) are important matrixes for luminescence due to its optical transparency. Recently, Low-dimensional La2M2O7(M=Ti, Zr, Sn) luminescent nanomaterials have also aroused a lot of concern from scientists. Therefore, fabrication of rare earth ions-doped La2M2O7(M=Ti, Zr, Sn) low-dimensional luminescent nanomaterials via electrospinning will be a meaningful subject of significance.In this dissertation, sol-gel process was applied to prepare the precursor sol of certain viscosity using PVP and various inorganic salts as starting materials, and electrospinning technique was used to fabricate PVP/inorganic salts composite nanofibers and composite nanobelts. La2Ti2O7:Eu3+nanobelts and nanofibers, La2Zr2O7 nanofibers, La2Zr207:RE3+(RE=Er, Yb/Er) nanobelts and nanofibers, La2Zr207:RE3+(RE=Eu, Tb) nanofibers, La2Zr2O7 nanofibers were fabricated by calcination of the as-prepared composite nanofibers and composite nanobelts. The samples were characterized by thermogravimetric-differential thermal analysis (TG-DTA), x-ray diffractometry (XRD), Fourier transform infrared spectrometry (FTIR), field emission scanning electron microscope (FESEM), transmission electron microscope (TEM), UV-Vis absorption spectroscopy (UV-Vis) and fluorescence spectroscopy. The results showed that as-prepared rare earth ions-doped La2M2O7(M=Ti, Zr) nanobelts with large width-to-thickness ratios were composed of nanorods or nanoparticles, the width of nanobelts were 0.45-5μm, and the thickness were ca.90-140 nm. The diameters of as-prepared rare earth ions-doped La2M2O7(M=Zr, Sn) nanofibers were in narrow range, and there is no cross-linking among nanofibers, and the diameter was about 140-180 nm. Some meaningful results were obtained, and laid solid foundation for the future study of luminescence or up-conversion luminescence of rare earth ions-doped La2M2O7(M=Ti, Zr, Sn) low-dimensional nanomaterials.