Fabrication And Characterization Of Rare Earth Ions-doped La₂Mo₂O₉ Low-dimensional Nanomaterials Via Electrospinning

Currently, nano rare earth luminescent materials is hot focus for the aspect of material science research, and it is wide range of application prospects for its unique properties.The lanthanum molybdenum is an important functional material, because it is not only applied to many areas of the catalysts as fast ionic conductors, and also has good stability and effective energy transfer characteristics, making it to become an excellent luminous matrix material. Therefore, fabrication of rare earth ions-doped La2Mo2O9 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 nitrate salts as starting materials, and electrospinning technique was used to fabricate PVP/nitrate composite nanofibers and composite nanobelts. La2Mo2O9, La2Mo2O9:Eu3+, La2Mo2O9:Tb3+, La2Mo2O9:Sm3+, La2Mo2O9:Er3+, La2Mo2O9:Nd3+, La2Mo2O9:Pr3+ nanofibers and porous nanobelts 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) and fluorescence spectroscopy. The results showed that the diameters of as-prepared rare earth ions-doped La2Mo2O9 nanofibers were in narrow range, and there is no cross-linking among nanofibers, and the diameter was about 180-220 nm, and the length was greater than 100μm. The structure of as-prepared rare earth ions-doped La2Mo2O9 nanobelts with large width-to-thickness ratios were porous, the width of nanobelts were 5-7μm, and the thickness were ca.130-280 nm, and the length was greater than 500μm. Some meaningful results were obtained, and laid solid foundations for the future study of luminescence or up-conversion luminescence of rare earth ions-doped La2Mo2O9 low-dimensional nanomaterials.