Investigation of structural transformations in nanophase titanium dioxide by Raman spectroscopy

Ma, Weibing; Lu, Zhong; Zhang, M.

doi:10.1007/s003390050723

Cited by 233 publications

(116 citation statements)

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“…In the spectra of all TiO 2 samples the dominant Raman modes can be assigned to the Raman active modes of the anatase crystal 144 (E g (1)), 197 (E g (2)), 399 (B 1g (1)), 519 (combination of A 1g and B 1g (2) that cannot be resolved at room temperature) and 639 cm À1 (E g (3)) [14]. The dependence of the shape of the Raman peaks from the crystal dimension may have various explanations.…”

Section: Resultsmentioning

confidence: 99%

“…Changes in the Raman spectra TiO 2 nanocrystals were related to non-stoichiometry, surface pressure and the phonon confinement effect [8][9][10][11]. In this study, we investigate the Raman spectra of TiO 2 nanocrystals at various annealing temperatures and particle sizes in order to get a better understanding of the lattice vibration characters in ultrafine particle TiO 2 systems.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

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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“…1b). Such an upward shift of the anatase band at 144 cm -1 can be explained by a decrease in the size of the anatase particles [60][61][62] and the breaking of the TiO 2 stoichiometry [63][64][65]. During the milling process, the band of anatase at 632 cm -1 was overlapped with a rutile band appearing at 611 cm -1 , so the resulting band was shifted to the lower position.…”

Section: Raman Measurements Of Ball-milled Crystallinementioning

confidence: 99%

The mechanochemical stability of hydrogen titanate nanostructures

Plodinec¹,

Friščić²,

Iveković³

et al. 2010

Journal of Alloys and Compounds

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The structural stability of some nanostructured titanates was investigated in terms of their subsequent processing and possible applications. With the aim to investigate their mechanochemical stability, we applied high-energy ball milling and studied the resulting induced phase transitions. Hydrogen titanates with two different morphologies, microcrystals and nanotubes, were taken into consideration. The phase-transition sequence was studied by Raman spectroscopy and X-ray powder diffraction, while the morphology and crystal structure, on the nanoscale, were analyzed by high-resolution transmission electron microscopy. During the mechanochemical treatment of both morphologies, the phase transitions from hydrogen titanate to TiO2 anatase and subsequently to TiO2 rutile were observed. In the case of hydrogen trititanate crystals, the phase transition to anatase starts after a longer milling time than in the case of the titanate nanotubes, which is explained by the larger particle size of the crystalline powder. However, the phase transition from anatase to rutile occurred more quickly in the crystalline powder than in the case of the nanotubes.

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“…1 (Tables 5 and 6). The first two factors are induced by the following factors: a confinement (by influence of sizes of nanotubes or grains) [32,33]; temperature and number of calcinations, which determines the degree of Semiconductor Physics, Quantum Electronics & Optoelectronics, 2011. V. 14, N 1.…”

Section: Raman Scatteringmentioning

confidence: 99%

“…P. 21-30. crystallization of nanoparticles [32]; nonstoichiometry (more precisely to the oxygen deficit) [34,35]. In particular, in Cd/TiO 2 the mode ω = is the one of high-order vibration of bond [35,36]; the mode ω = arises from the bond [35].…”

Section: Raman Scatteringmentioning

confidence: 99%

Hydrothermal synthesis and properties of titania nanotubes doped with Fe, Ni, Zn, Cd, Mn

Kulish¹

2011

Semicond. Phys. Quantum Electron. Optoelectron.

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Abstract. Fe/TiO 2 , Mn/TiO 2 , Zn/TiO 2 , Cd/TiO 2 , Ni/TiO 2 titania nanotubes were synthesized by the method of direct hydrothermal synthesis. Their properties have been investigated using X-ray phase analysis and X-ray fluorescent analysis, high-resolution transmission electron microscopy, luminescent spectroscopy and Raman scattering. It has been ascertained that the Fe/TiO 2 , Mn/TiO 2 , Zn/TiO 2 , TiO 2 titania nanotubes possess the structure of Na 2 Ti 2 O 4 (OH) 2 . The structure of Cd/TiO 2 titania, probably, is mixture of anatase and rutile phases. We have found that Fe, Mn, Zn, Cd, Ni does not form solid solution with TiO 2 , and these metals are located in interlayer space. The mechanism of nanotube formation has been briefly discussed.

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Investigation of structural transformations in nanophase titanium dioxide by Raman spectroscopy

Cited by 233 publications

References 0 publications

Influence of particle size on the phonon confinement of TiO₂nanoparticles

Influence of particle size on the phonon confinement of TiO₂nanoparticles

The mechanochemical stability of hydrogen titanate nanostructures

Hydrothermal synthesis and properties of titania nanotubes doped with Fe, Ni, Zn, Cd, Mn

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Investigation of structural transformations in nanophase titanium dioxide by Raman spectroscopy

Cited by 233 publications

References 0 publications

Influence of particle size on the phonon confinement of TiO2nanoparticles

Influence of particle size on the phonon confinement of TiO2nanoparticles

The mechanochemical stability of hydrogen titanate nanostructures

Hydrothermal synthesis and properties of titania nanotubes doped with Fe, Ni, Zn, Cd, Mn

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Product

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Influence of particle size on the phonon confinement of TiO₂nanoparticles

Influence of particle size on the phonon confinement of TiO₂nanoparticles