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Modifikacija strukturnih, morfoloških i optičkih svojstava anatas TiO2 nanočestica dopiranjem trovalentnim jonima retkih zemalja

Modification of structural, morphological and optical properties of anatase TiO2 nanoparticles doped with trivalent rare-earth ions.

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Disertacija.pdf (7.140Mb)
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Author
Milićević, Bojana R.
Mentor
Stojković Simatović, Ivana
Committee members
Dramićanin, Miroslav
Šljukić-Paunković, Biljana
Đorđević, Vesna
Minić-Popović, Dragica
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Abstract
U ovoj doktorskoj disertaciji prikazana je temeljna studija modifikovanja strukturnih, morfoloških i optičkih svojstava anatas TiO2 nanočestica dopiranjem trovalentnim jonima retkih zemalja: prazeodijuma, neodijuma, samarijuma, europijuma, disprozijuma, terbijuma, holmijuma, erbijuma i tulijuma, pri koncentraciji od 1 at.%. Pomenuti materijali sintetisani su sol-gel tehnikom i žareni na temperaturi od 420 ºC. Strukturna svojstva nedopiranog anatas TiO2 kao i TiO2 dopiranоg jonima retkih zemalja ispitivana su rendgenskom difrakcionom analizom. Utvrđeno je da se sol-gel sintezom dobijaju čiste anatasne kristalne strukture sa veličinom kristalita od svega nekoliko nanometara. Uticaj jona retkih zemalja u anatasnoj kristalnoj strukturi titan-dioksida ogleda se u značajnom porastu specifične površine čestica. Takođe, sintetisani su nanoprahovi TiO2 koloidnom tehnikom u cilju korelisanja različitih metoda sinteza sa strukturnim, morfološkim i optičkim svojstvima...
The primary aim of this thesis is to explain the modification of structure, morphology and optical properties of anatase TiO2 nanoparticles doped with trivalent rare-earth ions: praseodymium, neodymium, samarium, europium, terbium, dysprosium, holmium, erbium, and thulium, with the concentration of 1 at.%. These materials were synthesized by the sol-gel technique and further annealed at 420 °C. Structural properties of anatase TiO2 and TiO2 doped with trivalent rare-earth ions are studied by X-ray diffraction analysis. It was confirmed that pure anatase TiO2 with the crystallite size of only a few nanometers was obtained by sol-gel synthesis. The incorporation of rare earth ions in the anatase TiO2 is reflected in the significant increase of the specific surface area of TiO2 nanopowders doped with rare-earth ions in comparison with undoped TiO2. Also, the TiO2 nanopowders were synthesized by a colloid technique to correlate the different methods of synthesis with structural, morphologi...cal and optical properties...

Faculty:
Универзитет у Београду, Факултет за физичку хемију
Date:
02-10-2017
Keywords:
titan(IV)-oksid / Titan(IV)-oxide / rare-earth ions / luminescent nanomaterials / lithium co-doping / photocatalytic nanomaterials / joni retkih zemalja / luminescentni materijali / Li+-kodopiranje / fotokatalitički materijali
[ Google Scholar ]
Handle
https://hdl.handle.net/21.15107/rcub_nardus_8915
URI
https://nardus.mpn.gov.rs/handle/123456789/8915
http://eteze.bg.ac.rs/application/showtheses?thesesId=5384
https://fedorabg.bg.ac.rs/fedora/get/o:16741/bdef:Content/download
http://vbs.rs/scripts/cobiss?command=DISPLAY&base=70036&RID=49501199

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