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Fabrication and Characterization of Magnetic-photoluminescent Low-dimensional Nanomaterials via Electrospinning

Author: MaQianLi
Tutor: DongXiangTing
School: Changchun University of Science and Technology
Course: Physical and chemical
Keywords: rare earth complexs ferroferric oxide electrospinning nano materials nanofibers nanoribbons coaxial nanofibers
CLC: TB383
Type: Master's thesis
Year: 2012
Downloads: 97
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Abstract


Rare Earth organic complexs possess excellent luminescent properties owing to the antenna effect of ligands and the f-f electron transition of RE3+ions, resulting in important applications in laser, phosphor, and optical data storage devices and OLEDs. Nanometer ferroferric oxide has unique magnetic characteristics, it can be availably used for magnetic memory materials, microwave absorbing materials, special coating, targeted drug delivery, multifunctional composite materials, catalysts, and biotechnology.Up until now, there are few studies on fabricating bifunctional magnetic-photoluminescent nanomaterials by electrospinning. The development of the nano-technique requires nanosize ferroferric oxide materials with various morphologies. It is difficult to prepare Fe3O4nanofiber with large length-diameter ratio by traditional method. No special reports regarding the preparation of Fe3O4nanoribbon.In this thesis, bifunctional magnetic-photoluminescent Fe3O4/Eu(BA)3phen/PVP composite nanofibers, Fe3O4/Eu(BA)3phen/PMMA composite nanoribbons and Fe3O4/PVP@Eu(BA)3phen/PVP coaxial nanofibers were prepared via electrospinning technology. Fe3O4nanofibers and nanoribbons were also obtained by oxidized Fe(NO3)3/PVP nanofibers (nanoribbons) into Fe2O3nanofibers (nanoribbons) at high temperature, and then reduction in hydrogen atmosphere.The morphologies and properties of the final products were investigated in details by XRD, SEM, TEM, VSM and fluorescence spectrometer. The results revealed that the Fe3O4/Eu(BA)3phen/PVP composite nanofibers, Fe3O4/Eu(BA)3phen/PMMA nanoribbons and Fe3O4/PVP@Eu(BA)3phen/PVP coaxial nanofibers exhibited magnetic-photoluminescent properties.5D0→7F2hypersensitive transition at617nm was the dominant emission peak. Optimum weight percentage of Eu(BA)3phen to PVP was15%. Saturation magnetization of the Fe3O4/Eu(BA)3phen/PVP composite nanofibers was enhanced with the add of more Fe3O4nanoparticles, however, the fluorescence intensity was decreased with increasing of Fe3O4nanoparticles. The similar situation happened to Fe3O4/Eu(BA)3phen/PMMA nanoribbons. Optimum weight percentage of Eu(BA)3phen to PMMA was10%. Due to the advantage of structure, the luminescent intensity of Fe3O4/PVP@Eu(BA)3phen/PVP coaxial nanofibers was almost not weakened in spite of the existence of the non-luminescent Fe3O4/PVP core. Saturation magnetization, remanent magnetism and coercive force of Fe3O4nanofibers and nanoribbons we obtained were relatively high. The saturation magnetization of Fe3O4nanofibers and nanoribbons were73.53emu·g-1and91.61emu·g-1respectively.

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