Influence of manganese ions on the anatase–rutile phase transition of TiO2 prepared by the sol–gel process

Arroyo, R.; Córdoba, G.; Padilla, Juan; Lara, V. H.

doi:10.1016/s0167-577x(01)00600-0

Cited by 142 publications

(85 citation statements)

References 17 publications

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“…[17][18][19][20] Meanwhile, the line broadening of the diffraction peaks results from the small grain sizes and structural defects of the sample, which benefits the catalytic activity of the catalyst. The experiment results show that crystallite size of TiO 2 is 30.95 nm, and those of 0.5 mol% to 5 mol% La-TiO 2 nanofibers are 21.16 nm, 17.87 nm, 17.09 nm, 13.86 nm, 11.74 nm, respectively, illustrating that La dopant can suppress the growth of the TiO 2 crystals.…”

Section: Analysis Of La-tio 2 Nanofibers With Different La Contentmentioning

confidence: 99%

Photocatalytic Activity of TiO₂ Nanofibers with Doped La Prepared by Electrospinning Method

2015

J Chinese Chemical Soc

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La-TiO 2 nanofibers are prepared by a sol-gel assisted electrospinning method. The structure and morphology of La-TiO 2 nanofibers are characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). XRD analysis shows that the weight percentage of anatase and rutile in the 1.5 mol% La-TiO 2 nanofibers calcined at 600°C is about 8:2, which is similar to P-25. The XRD data of La-TiO 2 nanofibers with different La content shows that La 3+ dopant has a great inhibition on TiO 2 phase transformation. The photocatalytic activity of the as-prepared La-TiO 2 nanofibers is evaluated by photocatalytic decolorization of Methylene Blue (MB) aqueous solution. The results show that the 1.5 mol% La-TiO 2 nanofibers calcined at 600°C exhibit high photocatalytic activity, indicating that 600°C and 1.5 mol% are the appropriate calcination temperature and optimal molar ratio of La to Ti, respectively.

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Section: Analysis Of La-tio 2 Nanofibers With Different La Contentmentioning

confidence: 99%

Photocatalytic Activity of TiO₂ Nanofibers with Doped La Prepared by Electrospinning Method

2015

J Chinese Chemical Soc

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“…This anatase-rutile phase transition is probably related to an increase in the concentration of metallic dopants (donor or acceptor). Indeed, acceptors of type Cr 3+ , for example, introduce oxygen vacancies and thus accelerates the anatase-rutile transition [11,12]. In such films, chromium oxide appears to be in two States, namely CrO 2 (the main component, which is also the most stable) and Cr 2 O 3 .…”

Section: X-ray Diffractionmentioning

confidence: 99%

Microstructure and Optical Properties of Pure and Cr-Doped TiO2 Thin Films

Hajjaji

Amlouk

Gaidi

et al. 2014

Chromium Doped TiO2 Sputtered Thin Films

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This chapter describes the structural, optical and electrical properties of TiO 2 layers grown on various substrates such as quartz, intrinsic silicon and both P and N types silicon. This chapter starts with a brief description of the deposition parameters. In particular, the influence of chromium content as well as the growth and mechanism conditions on the structure, morphology and optical proprieties (size of crystallites, mesh parameter, morphology, chemical composition, optical index, bandgap energy, reflectivity, etc.) of the final prepared films are described.Keywords X-ray diffraction (XRD) · X-ray photospectroscopy (XPS) · X-ray reflectometry · Fourier transform infra-red spectroscopy (FTIR) · Raman spectroscopy · Ellipsometry · UV-visible spectroscopy · Band gap energy IntroductionThis chapter is dedicated to the study of the structural, optical and electrical properties of TiO 2 layers on a substrate (quartz, intrinsic silicon, P type silicon and N type silicon). A parametric study was undertaken in order to get a fine control of different films properties. Thus, the influence of deposition parameters (Cr doping, effect of deposition temperature, development time, power) was closely correlated with the microstructural and optical characteristics (size of crystallites, mesh parameter, morphology, chemical composition, optical index, bandgap energy, reflectivity, etc.). TiO 2 thin films doped with Cr were developed by co-deposition using magnetron sputtering process with two targets, the TiO 2 and the chromium ones. Index of purity are 99.995 and 99.99 % respectively for Cr and Titanium oxide. The applied power to the target, the pressure, flow and volumetric ratio of Ar and O 2 gases, as well as the possible polarization of the substrate were chosen based on previous work (see Table 3.1) [1].

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“…The anatase films prepared by sol-gel were reported to be transformed to rutile in between 873 and 1073 K. [29][30][31] The T AR of the films prepared by sputtering was 1023 to 1173 K. 32,33) The anatase films prepared by CVD had higher T AR than those prepared by sol-gel and sputtering, around 973 to 1273 K. Furthermore, the anatase film in the present study had the highest T AR from 1323 to 1373 K. Kim et al reported that the T AR of anatase particles synthesized by CVD using TTIP was ranged between 1073 and 1173 K; where the higher carbon content the lower T AR . However, the amount of carbon content was not determined.…”

Section: )mentioning

confidence: 99%

High Temperature Stability of Anatase Films Prepared by MOCVD

Goto

2008

Mater. Trans.

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Highly thermally stable anatase films were prepared by metal-organic chemical vapor deposition (MOCVD) using Ti(O-i-Pr) 2 (dpm) 2 as precursor. The effect of heat treatment on the microstructure, transmittance, optical band gap and refractive index of anatase films was investigated. Anatase films in a single phase were obtained at T sub (substrate temperature) < 723 K. By heat-treating the anatase film at 1273 K, no phase transformation was observed without changing the transmittance and optical band gap, whereas the refractive index increased. A small amount of rutile phase was identified in the anatase film by heat-treating at 1323 K. The anatase films transformed into rutile in a single phase by heat-treating at 1373 K, resulting in a decrease in transmittance and optical bandgap and an increase in refractive index.

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Influence of manganese ions on the anatase–rutile phase transition of TiO2 prepared by the sol–gel process

Cited by 142 publications

References 17 publications

Photocatalytic Activity of TiO₂ Nanofibers with Doped La Prepared by Electrospinning Method

Photocatalytic Activity of TiO₂ Nanofibers with Doped La Prepared by Electrospinning Method

Microstructure and Optical Properties of Pure and Cr-Doped TiO2 Thin Films

High Temperature Stability of Anatase Films Prepared by MOCVD

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Influence of manganese ions on the anatase–rutile phase transition of TiO2 prepared by the sol–gel process

Cited by 142 publications

References 17 publications

Photocatalytic Activity of TiO2 Nanofibers with Doped La Prepared by Electrospinning Method

Photocatalytic Activity of TiO2 Nanofibers with Doped La Prepared by Electrospinning Method

Microstructure and Optical Properties of Pure and Cr-Doped TiO2 Thin Films

High Temperature Stability of Anatase Films Prepared by MOCVD

Contact Info

Product

Resources

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Photocatalytic Activity of TiO₂ Nanofibers with Doped La Prepared by Electrospinning Method

Photocatalytic Activity of TiO₂ Nanofibers with Doped La Prepared by Electrospinning Method