| Abstract [eng] |
The aim of this PhD study was to investigate luminescence properties of lanthanide-substituted Mg-Al LDHs. For the first time lanthanide-substituted LDHs were synthesized using indirect sol-gel synthesis processing. The novelty of this PhD thesis is the determined possibility to induce luminescence in some lanthanide-substituted LDHs by intercalation of different anions and to develop new thin films of Mg-Al LDHs. Compounds were synthesized by co-precipitation and sol-gel methods. X-ray diffraction analysis (XRD), infrared spectroscopy (FTIR), scanning electron microscopy (SEM), thermal analysis (TG), ultraviolet and visible radiation spectroscopy (UV-Vis), atomic force microscopy (AFM). The monophasic europium-substituted Mg3Al1-xEux LDHs were obtained with amount of Eu less than 5 mol%. Inorganic CO32- to OH-, Cl-, NO3- anions has been exchanged and intercalated with terephthalate (TAL) in to the Mg3Al and Mg3Al1-xEux LDH hosts. The Mg3Al-CO3 and Mg3Al1-xEux LDHs have been intercalated with benzoate, oxalate, laurate, malonate, succinate, tartrate, 1,3,5-benzentricarboxylate, 4-methylbenzoate, 4-dimethylaminobenzoate and 4-biphenylacetonate and the photoluminescent properties of modified LDHs were evaluated and compared. The Mg3Al LDH coatings have been successfully fabricated on the silicon and stainless-steel substrates using the dip-coating processing route. The XRD patterns demonstrated high crystallinity of synthesized Mg3Al1 LDH. The RMS values also were obtained for the MgAl LDH samples. |
