Structural, optical, and magnetic properties of polycrystalline Co-doped TiO2 synthesized by solid-state method

Bouaine, A.; Schmerber, G.; Ihiawakrim, Dris; Derory, A.

doi:10.1016/j.mseb.2012.08.014

Cited by 26 publications

(5 citation statements)

References 39 publications

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“…These M s values are abnormally high. They are significantly higher than earlier reported for Co-doped titania produced by the hydrothermal method without chitosan (1.25 Â 10 À2 emu Á g À1 [9]) and the solid-state method (0.12 emu Á g À1 [11]). …”

Section: Resultscontrasting

confidence: 61%

“…4(a), the M(H) dependence at room temperature (300 K) measured for the as-prepared product is linear due to a paramagnetic component of the sample. It should also be mentioned that this dependence does not pass through zero, indicating a small magnetism that has been observed by several authors previously [9][10][11] in the structures with different types of oxygen vacancies. The magnetic susceptibility values decrease from 7.89 Â 10 À6 at 80 K to 2.53 Â 10 À6 at 300 K, and to 1.68 Â 10 À6 cm 3 Á g À1 at 500 K for this sample.…”

Section: Resultsmentioning

confidence: 57%

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Fabrication of Surface-Modified One-Dimensional Titania Nanostructures in the Presence of Chitosan

Zima¹,

Батаев²,

Smirnov³

2015

Materials and Manufacturing Processes

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One-dimensional TiO 2 -based nanostructures with modified surface have been produced by alkaline hydrothermal treatment of TiO 2 and CoTiO 3 powders in the presence of bioactive natural polymer-chitosan-as the organic reagent. Nanostructures are characterized by multilayer morphology. However, characteristic interlayer distances are significantly higher than in those produced without chitosan. Moreover, thin bioorganic layers are observed on the surface of elongated structures produced by processing of TiO 2 powder. Quite different surfaces with numerous Co-containing agglomerates of chitosan derivatives are detected when CoTiO 3 powder is processed. After vacuum treatment at 600 C and higher, Co-containing elongated nanostructures demonstrate the abnormal high ferromagnetic properties.

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Section: Resultscontrasting

confidence: 61%

Section: Resultsmentioning

confidence: 57%

Fabrication of Surface-Modified One-Dimensional Titania Nanostructures in the Presence of Chitosan

Zima¹,

Батаев²,

Smirnov³

2015

Materials and Manufacturing Processes

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“…So, IELs are beneficial for extending the sensitive light wavelength. The result gives a good explanation of the red shift [31-34]. However, for these kinds of IELs, high impurity doping concentration might form a recombination center for photoexcited electron–hole pairs and results in a decrease in the quantum yield for the photocatalytic reactions [21].…”

Section: Resultsmentioning

confidence: 99%

First-principles study on transition metal-doped anatase TiO2

et al. 2014

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The electronic structures, formation energies, and band edge positions of anatase TiO2 doped with transition metals have been analyzed by ab initio band calculations based on the density functional theory with the planewave ultrasoft pseudopotential method. The model structures of transition metal-doped TiO2 were constructed by using the 24-atom 2 × 1 × 1 supercell of anatase TiO2 with one Ti atom replaced by a transition metal atom. The results indicate that most transition metal doping can narrow the band gap of TiO2, lead to the improvement in the photoreactivity of TiO2, and simultaneously maintain strong redox potential. Under O-rich growth condition, the preparation of Co-, Cr-, and Ni-doped TiO2 becomes relatively easy in the experiment due to their negative impurity formation energies, which suggests that these doping systems are easy to obtain and with good stability. The theoretical calculations could provide meaningful guides to develop more active photocatalysts with visible light response.

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“…O-DMSs with high Curie temperature have technological applications in the fields of optoelectronics, magnetoelectronics and microwave devices [4]. However, the origin of ferromagnetism * E-mail: salma iqbal1990@hotmail.com in these oxide DMSs is still controversial as to whether it is caused by electron spins or it stems from magnetic precipitations due to dopant ions segregation [5].…”

Section: Introductionmentioning

confidence: 99%

“…These properties are promising for applications such as catalysts, photoanodes, solar cells, magneto-optical devices [4]. TiO 2 is found in three crystalline forms: rutile, anatase and brookite.…”

Section: Introductionmentioning

confidence: 99%

Effects of Cr and Fe co-doping on structural, optical, electrical and magnetic properties of titanium dioxide (TiO₂)

Waseem

Anjum

Mustafa

et al. 2015

Materials Science-Poland

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A series of Ti 0.9 Fe 0.1−x Cr x O 2 (where x = 0.0, 0.02, 0.04, 0.6, 0.08, 0.10) was synthesized using the powder metallurgy route. The structural, morphological, magnetic, optical and electrical properties were investigated by X-ray diffractometry (XRD), Raman spectroscopy, scanning electron microscopy (SEM), vibrating sample magnetometry (VSM), UV-Vis spectroscopy and four probe technique, respectively. The rutile phase was confirmed by XRD analysis which was also verified by Raman spectroscopy. It was observed that the grain size increased as the concentration of Cr increased. M-H loops extracted from VSM analysis revealed anti-ferromagnetic, weak ferromagnetic and paramagnetic behaviors at room temperature. The band gap energy and resistivity measurements exhibited the semiconducting nature of Ti 0.9 Fe 0.1−x Cr x O 2 based diluted magnetic semiconductors.

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Structural, optical, and magnetic properties of polycrystalline Co-doped TiO2 synthesized by solid-state method

Cited by 26 publications

References 39 publications

Fabrication of Surface-Modified One-Dimensional Titania Nanostructures in the Presence of Chitosan

Fabrication of Surface-Modified One-Dimensional Titania Nanostructures in the Presence of Chitosan

First-principles study on transition metal-doped anatase TiO2

Effects of Cr and Fe co-doping on structural, optical, electrical and magnetic properties of titanium dioxide (TiO₂)

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Structural, optical, and magnetic properties of polycrystalline Co-doped TiO2 synthesized by solid-state method

Cited by 26 publications

References 39 publications

Fabrication of Surface-Modified One-Dimensional Titania Nanostructures in the Presence of Chitosan

Fabrication of Surface-Modified One-Dimensional Titania Nanostructures in the Presence of Chitosan

First-principles study on transition metal-doped anatase TiO2

Effects of Cr and Fe co-doping on structural, optical, electrical and magnetic properties of titanium dioxide (TiO2)

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Product

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Effects of Cr and Fe co-doping on structural, optical, electrical and magnetic properties of titanium dioxide (TiO₂)