Structural, optical and weak magnetic properties of Co and Mn codoped TiO 2 nanoparticles

Kumar, Anand; Kashyap, Manish K.; Sabharwal, Namita; Kumar, Sarvesh; Kumar, Ashok; Kumar, Parmod; Asokan, K.

doi:10.1016/j.solidstatesciences.2017.09.002

Cited by 36 publications

(8 citation statements)

References 38 publications

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“…However, the synthesized un-doped TiO2 of the present work has PM behaviour of small susceptibility (~10 -7 cgs/g), as presented in Table:2. Similar behaviour was also observed earlier [38,39]. The PM properties were attributed to the created structural point defects, including O-vacancies.…”

Section: 1-investigation Of the As-prepared Samplessupporting

confidence: 85%

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Influence of hydrogenation conditions on the structural, optical, and magnetic properties of degenerated Ni/Al co-doped anatase nanocomposite

Dakhel

2020

Preprint

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In the present work, pristine and Ni2+/Al3+- codoped anatase (TiO2) nanocomposite powders were synthesized by the thermal co-precipitation method. The samples were characterized by several techniques. The X‐Ray diffraction (XRD) was used for structural characterization and the optical absorption spectroscopy was used for the optical characterization. The structural/optical studies proved the formation of a substitutional solid solution (SSS). The magnetization measurements were performed to investigate the magnetic properties of the synthesized samples. In the present work, nickel (Ni2+) dopant ions were used to introduce stable ferromagnetic (FM) properties into the synthesized anatase, while Al3+ dopant ions were utilized to supply itinerant electrons necessary to support and boost the created FM properties. The roadmap of the present work was to establish the hydrogenation conditions necessary to create ferromagnetic (FM) properties in the host codoped samples and study the effect of hydrogenation temperature on the parameters of the created FM properties, especially the magnetic energy (Umag) and saturation magnetization (Msat). It was found that the created FM properties in Ni/Al-doped TiO2 nanocomposite powder by using the hydrogenation effect could be enhanced and controlled via the temperature of the hydrogenation (TH). The experimental results revealed that Umag of TiO2:Ni:Al system increased by ~241% and the saturation magnetization by ~140% with increasing of TH by 100 oC (from 400 oC to 500oC). The obtained saturation magnetization (Msat) of 1.09 emu/g and magnetic energy (Umag) of 42.6 erg/g were higher than the previously obtained values for created Ni-doped TiO2 by ~50 times. Such great novel results were obtained due to dealing with two factors; the Al3+ ions as co-dopant, which can supply an excess of itinerant electrons that boost the S.S Heisenberg interactions in addition to choosing a suitable temperature of hydrogenation.

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Section: 1-investigation Of the As-prepared Samplessupporting

confidence: 85%

“…The pristine anatase TiO2 was known to have diamagnetic (DM) properties [38,39]. However, the synthesized un-doped TiO2 of the present work has PM behaviour of small susceptibility (~10 -7 cgs/g), as presented in Table:2.…”

Section: 1-investigation Of the As-prepared Samplesmentioning

confidence: 80%

Influence of hydrogenation conditions on the structural, optical, and magnetic properties of degenerated Ni/Al co-doped anatase nanocomposite

Dakhel

2020

Preprint

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“…22 It is also observed that the codoping provides a reduction in its crystallite size, where this fact may be associated with the appearance of oxygen vacancies due to the differences between the metallic cations. 23 The morphology of the nanoparticles was observed by SEM, as shown in Fig. 2.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of Co2+ and Mn2+ Codoped ZnO Nanoparticles Obtained by the Sonochemical Method: Photocatalytic and Antimicrobial Properties

Neto

Oliveira

Bomio

et al. 2019

Journal of Elec Materi

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Nanoparticles of Co 2+ and Mn 2+ codoped ZnO have been obtained by the sonochemical method. The nanoparticles were characterized by x-ray diffraction, scanning electron microscopy, ultraviolet-visible spectroscopy, N 2 adsorption by the Brunauer-Emmett-Teller method and electrical measurements by current-voltage curves. The photocatalytic property was analyzed against the methylene blue (MB) dye and the antimicrobial properties were estimated against the Staphylococcus aureus (Gram-positive) and Escherichia coli (Gram-negative) bacteria by the disc diffusion method. The results indicate that ZnO powders were obtained without the formation of secondary phases, with initial nanoplate morphology, which is lost with doping. The codoped sample had a five-fold higher electrical response, reduced the MB dye concentration by 10% and increased the inhibition halo by 3 cm and 4 cm against S. aureus and E. coli, respectively, compared to bare ZnO.

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“…Many relevant experiments have been successfully conducted to study the room temperature ferromagnetic behavior of DMSs, especially TiO 2 -based DMSs [ 4 , 5 , 6 , 7 ]. Researchers studying TiO 2 -based DMSs ferromagnetism have mainly concentrated on element doping, such as Co, Mn, Ru, Ni, Fe, Cu, Sm, S, N [ 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 ], and so on. Based on these studies, several models have emerged to illustrate DMSs’ room temperature ferromagnetic origin, such as the Stoner-type model [ 18 ], the band-coupling model [ 19 ], and the Ruderman–Kittel–Kasuya–Yosida model.…”

Section: Introductionmentioning

confidence: 99%

Ferromagnetic Properties of N-Doped and Undoped TiO2 Rutile Single-Crystal Wafers with Addition of Tungsten Trioxide

Wang

Zhou

et al. 2018

Materials

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In this work, undoped, N-doped, WO3-loaded undoped, and WO3-loaded with N-doped TiO2 rutile single-crystal wafers were fabricated by direct current (DC) magnetron sputtering. N-doping into TiO2 and WO3 loading onto TiO2 surface were used to increase and decrease oxygen vacancies. Various measurements were conducted to analyze the structural and magnetic properties of the samples. X-ray diffraction results showed that the N-doping and WO3 loading did not change the phase of all samples. X-ray photoelectron spectroscopy results revealed that W element loaded onto rutile single-crystal wafers existed in the form of WO3. UV-Vis spectrometer results showed that the absorption edge of WO3-loaded undoped and WO3-loaded with N-doped TiO2 rutile single-crystal wafers had red shift, resulting in a slight decrease in the corresponding band gap. Photoluminescence spectra indicated that oxygen vacancies existed in all samples due to the postannealing atmosphere, and oxygen vacancies density increased with N-doping, while decreasing with WO3 loading onto TiO2 surface. The magnetic properties of the samples were investigated, and the saturation magnetization values were in the order N-doped > WO3-loaded with N-doped > undoped > WO3-loaded undoped rutile single-crystal wafers, which was the same order as the oxygen vacancy densities of these samples. N-doping improved the saturation magnetization values, while WO3-loaded decreased the saturation magnetization values. This paper reveals that the magnetic properties of WO3-loaded with N-doped rutile single-crystal wafers originate from oxygen vacancies.

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Structural, optical and weak magnetic properties of Co and Mn codoped TiO 2 nanoparticles

Cited by 36 publications

References 38 publications

Influence of hydrogenation conditions on the structural, optical, and magnetic properties of degenerated Ni/Al co-doped anatase nanocomposite

Influence of hydrogenation conditions on the structural, optical, and magnetic properties of degenerated Ni/Al co-doped anatase nanocomposite

Synthesis and Characterization of Co2+ and Mn2+ Codoped ZnO Nanoparticles Obtained by the Sonochemical Method: Photocatalytic and Antimicrobial Properties

Ferromagnetic Properties of N-Doped and Undoped TiO2 Rutile Single-Crystal Wafers with Addition of Tungsten Trioxide

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