Characterization of anatase TiO2 nanopowder by variable-temperature Raman spectroscopy

Šćepanović, Jelena; Grujić‐Brojčin, M.; Dohčević‐Mitrović, Z.; Popović, Zoran V.

doi:10.2298/sos0901067s

Cited by 86 publications

(62 citation statements)

References 16 publications

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“…The spectra show symmetric modes of vibration A1g + 2B1g + 3Eg of tetragonal anatase phase identified at 142 (Eg), 196 (Eg), 396 (B1g), 512 (A1g) and 637 cm −1 (Eg). The observed band positions are in agreement with the previous reports for anatase phase [15,18,19]. Raman spectra of the films, crystallized at 1 h, 2 h In order to see the differences between the spectra more clearly, the full-widths at half-maximum (FWHM) of the lowest frequency Raman mode band are given in Table 1.…”

Section: R a M A N S P E C T R O S C O P Ysupporting

confidence: 90%

Characterization of TiO₂ films obtained by a wet chemical process

Sedik

Ferraria

Carapeto

et al. 2017

Journal of Electrical Engineering

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TiO 2 has an easily tunable bandgap and a great absorption dye ability being widely used in many fields and in a number of fascinating applications. In this study, a wet chemical route, particularly a sol gel method using spin-coating is adopted to deposit TiO 2 thin films onto soda lime glass and silicon substrates. TiO 2 films were prepared by using an alcoholic solution of analytical reagent grade TiCl 4 as titanium precursor at various experimental conditions. The accent was put on the conditions of preparation (spin time, spin speed, precursor concentration, number of coating layers etc), doping and on the post-deposit treatment namely the drying and the crystallization. The results showed a strong dependence on the drying temperature and on the temperature and duration of the crystallization. We found that the solution preparation and its color are important for getting a reproducible final product. The Raman spectra recorded at room temperature, showed the characteristic peaks of anatase which appear at 143 and around 396 cm −1 . These peaks confirm the presence of TiO 2 . The X-ray diffraction (XRD) was used to identify the crystalline characteristic of TiO 2 while the chemical states and relative amounts of the main elements existing in the samples were investigated by X-ray Photoelectron Spectroscopy (XPS). The morphology of the samples was visualized by AFM. We show by this work the feasibility to obtain different nanostructured TiO 2 by changing the concentration of the solution. Photocatalytic activity of TiO 2 films was evaluated. Rhodamine B is a recalcitrant dye and TiO 2 was successfully tested for its oxidation. An abatement of 60% was obtained under sunlight for an initial concentration of 10 mg/l. K e y w o r d s: Titanium oxide, spin-coating, XPS, Raman, XRD

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Section: R a M A N S P E C T R O S C O P Ysupporting

confidence: 90%

Characterization of TiO₂ films obtained by a wet chemical process

Sedik

Ferraria

Carapeto

et al. 2017

Journal of Electrical Engineering

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“…The distribution with σ L > σ D increases mode asymmetry and shifts spectrum towards higher frequencies. Let us note that use of asymmetrical Gaussian PSD with proper choice of parameters gives similar results as using PCM with log-normal distribution [11]. The experimental Raman spectra of anatase TiO 2 The change of lattice parameters (lattice volume) with nanoparticle size L decrease is registered in nanomaterials due to effect of microstrain [12,13].…”

Section: Eq (1) Psd Is Included By Distribution Function ρ(L)mentioning

confidence: 84%

Use of Phonon Confinement Model in Simulation οf Raman Spectra of Nanostructured Materials

2009

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The simulation of the Raman spectra of nanostructured materials, where the effects of frequency shift and asymmetric broadening of the Raman modes play an important role, can be very useful in systematic characterization of these materials. Use of phonon confinement model for calculating Raman spectra of different nanomaterials is considered both from the viewpoint of different confinement function and the confinement strength, as well as the dimensionality of the confinement model. The phonon dispersion relations and the choice of their approximation are also studied. The influence of particle size distribution on the shape of the calculated spectra is discussed and contributions of Gaussian and asymmetric Gaussian distribution are compared. The effects of average and inhomogeneous strain on the behavior of simulated Raman spectra are also discussed. The results of the phonon confinement model are compared to the experimental spectra of CeO2 and anatase TiO2 nanopowders.

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“…All the estimated and measured particle size are listed in Table 1. [4,5]. However, the peaks corresponding to E g and B 1g modes in our Raman spectra are apparently red-shifted to around 144 and 399 cm -1 , respectively.…”

Section: Resultsmentioning

confidence: 61%

“…Further, Raman spectroscopy results also indicate suppression of the Ti-O bonds due to loading of rare-earth ions. The FTIR spectra (Figure 4) of pure TiO 2 , in general, shows multiple peaks in the region 420 cm -1 to 550 cm -1 , which are usually associated with the various characteristic vibrational modes of Ti-O bonds [5]. For loaded NPC samples however, the intense peaks at wavenumber 492 cm -1 and 434 cm -1 are missing and overall peak intensity is reduced in the FTIR spectra, which indicates that the dopant ions have suppressed the Ti-O bonds.…”

Section: Resultsmentioning

confidence: 99%

Efficient and rapid degradation of Congo red dye with TiO₂based nano-photocatalysts

Narayan

Alemu

2017

J. Phys.: Conf. Ser.

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Characterization of anatase TiO2 nanopowder by variable-temperature Raman spectroscopy

Cited by 86 publications

References 16 publications

Characterization of TiO₂ films obtained by a wet chemical process

Characterization of TiO₂ films obtained by a wet chemical process

Use of Phonon Confinement Model in Simulation οf Raman Spectra of Nanostructured Materials

Efficient and rapid degradation of Congo red dye with TiO₂based nano-photocatalysts

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Characterization of anatase TiO2 nanopowder by variable-temperature Raman spectroscopy

Cited by 86 publications

References 16 publications

Characterization of TiO2 films obtained by a wet chemical process

Characterization of TiO2 films obtained by a wet chemical process

Use of Phonon Confinement Model in Simulation οf Raman Spectra of Nanostructured Materials

Efficient and rapid degradation of Congo red dye with TiO2based nano-photocatalysts

Contact Info

Product

Resources

About

Characterization of TiO₂ films obtained by a wet chemical process

Characterization of TiO₂ films obtained by a wet chemical process

Efficient and rapid degradation of Congo red dye with TiO₂based nano-photocatalysts