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Synthesis, Characterization and Application of Luminescent Rare-earth Fluoride and Magnetic Oxide Nanocrystals

Author: WangLeYu
Tutor: LiYaDong
School: Tsinghua University
Course: Chemistry
Keywords: rare-earth fluoride luminescence magnetic nanomaterials bioapplication
CLC: O611.3
Type: PhD thesis
Year: 2007
Downloads: 1799
Quote: 5
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Abstract


Lanthanide-doped luminescent nanomaterials have great potentials in the field of optical devices, solar cells, biological labels, and anticounterfeiting applications. Meanwhile, magnetic nanomaterials have also been widely used in the filed of magnetic memory, drug and gene delivery, bioseparation, and magnetic resonance imaging. Developing new synthetic technologies for these nanomaterials is very important to both fundamental research and practical application. Surrounding the rare-earth-doped fluoride and magnetic oxide nanocrystals, this dissertation presents a systematic research about their preparation, characterization and application.Based on the solvothermal technology, a facile method was developed to prepare hydrophilic NaYF4:Yb3+-Er3+ nanospheres with controllable sizes. By prolonging the reaction time, the cubic phase nanocrystals transferred into hexagonal phase nanocrystals that can emit stronger green upconversion fluorescence. These luminescent nanocrystals were functionalized with biotin and nucleic acids and used as biolabels for the determination of avidin and DNA. Based on their novel upconversion luminescence, a facile, rapid and sensitive biological determination method was successfully developed.With 1,6-hexanediamine as amine-functionalization reagent, a facile one-pot strategy was put forward to prepare amine-functionalized magnetite nanoparticles and hollow nanospheres with excellent magnetism, tunable sizes, good dispersibility and crystallinity. These hydrophilic nanocrystals were used for the magnetic bioseparation of antibody in immunoassay and as contrast agents in MRI. The results indicate that this work provide a novel viewpoint for the preparation of bioapplication nanomaterials.Luminescent LaF3:Ce3+/Tb3+ single nanoparticles were prepared by using a facile, solvothermal strategy. Thereafter, these highly luminescent nanocrystals were functionalized with glucose and used as energy donor for the glucose fluorescence resonance energy transfer (FRET) determination. By using amine-functionalized SiO2 nanospheres as supporting templates, the metal-organic coordination compound (SiO2-NH2@SA-La3+/Tb3+) luminescent nanospheres were successfully prepared. Based on their strong fluorescence and the optical sensibility to water, a sensitive and rapid fluorescence method has been developed for the determination of water in liquid. It is believable that the fabrication of this luminescent nanosphere will be a great potential model for other metal-organic coordination compound nanospheres. In addition, the fluorescence determination method demonstrated here represents a simple and potentially useful technique for the rapid and sensitive determination of water in liquid.In the water-oleic acid mixture system, a novel solvothermal technology was developed to fabricate LaF3, NaYF4, NaLaF4, CdS and ZnS single-crystal nanorods with nearly uniform size. By doping different rare-earth ions, the nanorods can emit different color downcoversion and upconversion fluorescence. For the next bioapplication as fluorescent biolabels, these luminescent nanocrystals were successfully transferred into aqueous solution from nonpolar surfactants with a microemulsion technology. Their applications in fluorescence imaging as cell labels are undergoing and some results have been successfully obtained.

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CLC: > Mathematical sciences and chemical > Chemistry > Inorganic Chemistry > Chemical elements and inorganic compounds > Nature
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