Raman study of the variation in anatase structure of TiO2 nanopowders due to the changes of sol–gel synthesis conditions

Golubović, A.; Šćepanović, M.; Kremenović, Aleksandar; Aškrabić, Sonja; Berec, Vesna; Dohčević‐Mitrović, Z.; Popović, Zoran V.

doi:10.1007/s10971-008-1872-3

Cited by 110 publications

(72 citation statements)

References 46 publications

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“…The main factors that influence the behavior of E g(1) mode in our samples synthesized by sol-gel method should be the grain size and the grain size distribution, as well as the disorder induced by existence of considerable amount of brookite phase in combination with anatase and by introducing of La 3+ ions into the TiO 2 lattice. The intensities of E g(1) mode for different samples calculated by phonon confinement model (PCM), described in detail in our previous papers [9,17], coincide well with the experimental spectra, as can be seen from Fig. 3a.…”

Section: Resultssupporting

confidence: 84%

Characterization of La-Doped TiO₂Nanopowders by Raman Spectroscopy

Šćepanović¹,

Aškrabić²,

Berec³

et al. 2009

Acta Phys. Pol. A

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Titanium dioxide (TiO 2 ) nanopowders doped with 0.65, 1, 2, 3 and 4 wt.% of lanthanum ions (La 3+ ) were synthesized by sol-gel technology. Dependence of structural and morphological characteristics of nanopowders on La 3+ content and synthesis conditions is investigated by the Raman spectroscopy. Very intensive modes observed in the Raman spectra of all nanopowder samples are assigned to anatase phase of TiO 2 . Additional Raman modes of extremely low intensity can be related to the presence of certain amount of highly disordered brookite phase in nanopowders. Dependence of the intensity ratio of the Raman modes which originate from anatase and brookite on doping conditions is specially analyzed. In order to estimate the variation of nanocrystallite size with dopant content, shift and asymmetrical broadening of the most intensive E g Raman mode of anatase are analyzed by phonon confinement model. The obtained results are compared with the results of X-ray diffraction spectroscopy. Special attention is dedicated to the changes in the Raman spectra of pure and La-doped TiO 2 nanopowders observed after high temperature treatment.

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Section: Resultssupporting

confidence: 84%

Characterization of La-Doped TiO₂Nanopowders by Raman Spectroscopy

Šćepanović¹,

Aškrabić²,

Berec³

et al. 2009

Acta Phys. Pol. A

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“…A many-body term is added in order to increase surface tension. As it will be demonstrated in this latter section, the resulting porous walls are more connected and qualitatively closer to that seen in experiment compared to the ones obtained with purely binary interactions, cf [3,6]. The many-body potential is also given in polynomial form…”

Section: Porous Media Creationsupporting

confidence: 71%

“…Using structure factor we can quantify self-similarity of the structure over in a range of different scales at micrometer level using fractal surface dimension D s [3]. A value of the fractal dimension of the aggregating system can be obtained from high wave vector side of the small angle scattering peak through relation…”

Section: Porous Media Creationmentioning

confidence: 99%

“…With powerful measurement techniques like ellipsometry and small angle scattering [1,2], one can obtain pore surface size and distribution information for thin films obtained by coating industry using sol-gel method [3]. In addition titanium-(TiO 2 ) and cerium-dioxide (CeO 2 ), obtained with the sol-gel method, are increasingly used as functional membranes due to their dual catalytic and structural properties.…”

Section: Introductionmentioning

confidence: 99%

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Towards Understanding of Influence of Restricted Geometry on Self-Diffusion in Porous Media

Stanković

2009

Acta Phys. Pol. A

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Novel simulation procedure of self-diffusion through model porous media is presented. The procedure is based on extensive use of molecular dynamic method. The introduced diffusion simulations have a potential to become a valuable design and development tool applications involving transport in porous media, e.g. filters or porous sensors. The porous membranes are created using phase-separating model with high surface tension and its properties are characterized and compared with existing porosimetry measurements and small angle scattering experiments. These membranes are then filled with a gas of diffusing particles. Relations between transport coefficients and material structure are discussed.

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“…(q) is q-dependent phonon frequency. By taking a spherical Brillouin zone and an isotropic dispersion curve, the dispersion relationship for the E g Raman mode in the anatase phase could be expressed as [16] …”

Section: Resultsmentioning

confidence: 99%

Influence of particle size on the phonon confinement of TiO₂nanoparticles

Venkatasubbu

Ramakrishnan

Sasirekha

et al. 2012

Journal of Experimental Nanoscience

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Titanium dioxide nanocrystals are prepared by a hydrolysis process of Titanium tetraisopropoxide. Nano crystals of various sizes are obtained after annealing from 300 to 450 C. Raman scattering was employed to investigate the evolution of the anatase phase in the nano crystals during annealing. X-ray diffraction, transmission electron microscopy and dynamic light scattering studies were done to supplement the Raman scattering results on particle size. Phonon confinement and non-stoichiometry effects are responsible for the blue shift and broadening of the lowest-frequency E g Raman mode.

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Raman study of the variation in anatase structure of TiO2 nanopowders due to the changes of sol–gel synthesis conditions

Cited by 110 publications

References 46 publications

Characterization of La-Doped TiO₂Nanopowders by Raman Spectroscopy

Characterization of La-Doped TiO₂Nanopowders by Raman Spectroscopy

Towards Understanding of Influence of Restricted Geometry on Self-Diffusion in Porous Media

Influence of particle size on the phonon confinement of TiO₂nanoparticles

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Raman study of the variation in anatase structure of TiO2 nanopowders due to the changes of sol–gel synthesis conditions

Cited by 110 publications

References 46 publications

Characterization of La-Doped TiO2Nanopowders by Raman Spectroscopy

Characterization of La-Doped TiO2Nanopowders by Raman Spectroscopy

Towards Understanding of Influence of Restricted Geometry on Self-Diffusion in Porous Media

Influence of particle size on the phonon confinement of TiO2nanoparticles

Contact Info

Product

Resources

About

Characterization of La-Doped TiO₂Nanopowders by Raman Spectroscopy

Characterization of La-Doped TiO₂Nanopowders by Raman Spectroscopy

Influence of particle size on the phonon confinement of TiO₂nanoparticles