Effect of Fe substitution on optical and magnetic properties of CeO2 nanoparticles

Bayyappagari, Balaraju; Kaleemulla, S.; Nasina, Madhusudhana Rao; Omkaram, I.; Dugasani, Sreekantha Reddy

doi:10.1016/j.ijleo.2017.10.025

Cited by 18 publications

(4 citation statements)

References 40 publications

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“…In the literature, it is reported several promising applications for CeO 2 as a catalyst to reform vapor of propylene glycol in microreactors [16], gas sensor [17], opto-magnetic [18], catalysis of NO reduction [19], CO oxidation [20], electrolyte for solid oxide fuel cells [21,22], antibacterial agent [23,24] and phosphors [25][26][27], for example. Different routes of synthesis are used for CeO 2 to achieve these interesting properties and applications such as solid state reaction [28,29], sol-gel [30], coprecipitation [31], conventional hydrothermal [32], microwave-assisted hydrothermal [33,34], sonochemistry [35] and ball milling [36].…”

Section: Introductionmentioning

confidence: 99%

Fast and continuous obtaining of Eu3+ doped CeO2 microspheres by ultrasonic spray pyrolysis: characterization and photocatalytic activity

Santiago

Neto

Longo

et al. 2019

J Mater Sci: Mater Electron

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In this work, CeO 2 :xEu 3+ (x = 0, 0.01, 0.02, 0.04 and 0.08 mol%) microspheres were obtained by the fast and continuous ultrasonic spray pyrolysis method. Powders were characterized by X-ray diffraction (XRD), X-ray fluorescence analysis (XRF), scanning electronic microscopy (FESEM), Raman spectra, UV-Visible spectroscopy (UV-Vis) and photocatalytic activity. All XRD patterns were indexed by the cubic structure of the fluorite type, without the presence of secondary phases, indicating success in the Eu 3+ doping in the CeO 2 structure. In addition, The XRF analysis confirmed the presence of Eu in the CeO 2 powders. In the Raman spectra of the samples occurs the vibrational mode F 2g , which is a characteristic band of materials with the fluorite type structure. Moreover, as the Eu 3+ ion increased, it was noticed the appearance of additional bands referring to oxygen vacancies. FESEM showed that the CeO 2 :xEu 3+ particles have a spherical morphology with homogeneous chemical composition and particle size between 73 and 1560 nm. It can be seen a slight increase of defects in their morphology as the Eu 3+ ion increases. The band gap varies between 3.22 and 3.28 eV, being influenced by defects in oxygen vacancies and the concentration of Ce 3+ ion. The addition of Eu 3+ generates the introduction of intermediary levels in the conduction band of CeO 2 , besides increasing the reactive species effects, favoring the photocatalysis of Rhodamine B dye.

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Section: Introductionmentioning

confidence: 99%

Fast and continuous obtaining of Eu3+ doped CeO2 microspheres by ultrasonic spray pyrolysis: characterization and photocatalytic activity

Santiago

Neto

Longo

et al. 2019

J Mater Sci: Mater Electron

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“…Direct ferromagnetic coupling (FCE) occurs on neighboring Fe ions of Fe 3+ -V o -Fe 3+ in the nanostructure, forming bound magnetic polarons and neighboring magnetic polarons. Thus, long-term Fe-Fe ferromagnetic coupling is formed in the CeO 2 nanostructure, which is beneficial for the enhancement of ferromagnetism [2,23,33]. Additionally, coupling between nearby Fe ions with different valence states and oxygen ions is believed to contribute to the magnetic properties by increasing the number of Fe ions in the CeO 2 lattice.…”

Section: Resultsmentioning

confidence: 99%

“…In recent years, oxide-based ferromagnetic semiconductors at room temperature have received widespread interest from researchers owing to their potential applications in such equipment as magnetic, electric and optical devices [1][2][3]. CeO 2 with a cubic structure of the fluorine type, one of the most important oxide semiconductors, has potential for use in ferromagnetic semiconductors owing to its unique magnetic properties [4,5].…”

Section: Introductionmentioning

confidence: 99%

Magnetic field-assisted solvothermal synthesis and the magnetic properties of Fe-doped CeO2 nanoparticles

Yang

Zhu

et al. 2020

Journal of Asian Ceramic Societies

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Fe-doped CeO 2 powders were prepared by the magnetic field-assisted solvothernal synthesis method. These powders were characterized using X-ray diffraction (XRD), scan electron microscopy (SEM), transmission electron microscopy (TEM) and magnetization measurement as a function of the field. The results showed that in the nanoparticles prepared without a magnetic field, increasing the Fe doping concentration caused morphological evolution. In pure CeO 2 , the morphology showed a hollow sphere-like structure. In doped CeO 2 with 5 wt% Fe, the morphology showed a loose sphere-like structure which was self-assembled by many small, round, sheet-like grains. In doped CeO 2 with 30 wt% Fe, the morphology showed a cross flowerlike structure composed of many plate-like grains. When a magnetic field of 0.8 T was introduced, the sphere-like structure became more looser at a 5 wt% Fe concentration and a larger number of nanowires were formed. At a 30 wt% Fe concentration, cluster flower-like grains composed of many regular plate-like grains were observed. Additionally, the Fe-doped CeO 2 nanoparticles showed weak ferromagnetism behavior at room temperature. Increasing the Fe doping concentration improved the ferromagnetism of nanoparticles. At a 30 wt% Fe doping concentration, applying a magnetic field of 0.8 T promoted the improvement of ferromagnetism.

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“…The synthesis of CeO2 can be carried out using several methods, such as reverse microemulsion [6], hydrothermal [11], sol-gel [12,13,14], green synthesis [15,16,17] combustion [18,19], ball-milling [20,21], precipitation and coprecipitation [22,23,24,25]. The precipitation method is the most commonly used because it is easy to perform, cost-effective, has high reaction rates, and can be conducted on both large and small scales.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Calcination Temperature on the Characteristics of CeO2 Synthesized Using the Precipitation Method

Bahtiar,

Windarti,

Hudiyanti

2024

J. Kim. Sains Apl.

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Cerium oxide (CeO2) was synthesized using the precipitation method at various calcination temperatures ranging from 500 to 700°C. Cerium(III) nitrate hexahydrate (Ce(NO)3.6H2O) was used as the precursor for cerium, while Cetyltrimethylammonium bromide (CTAB) acted as the morphology-directing agent. Characterization results indicated that pure CeO2 was obtained at all calcination temperature variations. Calcination temperature influences crystallinity, crystal size, and CeO2 crystal parameters. The crystallinity and crystal size of CeO2 increased with the rising calcination temperature, reaching values of 81.1–84.5% and 15.58–23.12 nm, respectively, along with larger crystal parameters as the temperature increased (a = 5.406–5.410 Å). Surface morphology showed irregular shapes of CeO2 particles, with decreasing sizes as the calcination temperature increased, ranging from 0.2-5.6 μm at 600°C to 0.12-2.9 μm at 700°C. The Ce/O ratio on the surface increased with the rising calcination temperature, reaching a range of 0.48–0.57. CeO2 obtained from calcination at 600°C exhibited the highest fluorescence emission intensity (λ= 496 nm), indicating the least oxygen vacancies presence. Therefore, for antioxidant and catalyst applications, it is preferable to calcinate CeO2 at 700°C.

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Effect of Fe substitution on optical and magnetic properties of CeO2 nanoparticles

Cited by 18 publications

References 40 publications

Fast and continuous obtaining of Eu3+ doped CeO2 microspheres by ultrasonic spray pyrolysis: characterization and photocatalytic activity

Fast and continuous obtaining of Eu3+ doped CeO2 microspheres by ultrasonic spray pyrolysis: characterization and photocatalytic activity

Magnetic field-assisted solvothermal synthesis and the magnetic properties of Fe-doped CeO2 nanoparticles

The Effect of Calcination Temperature on the Characteristics of CeO2 Synthesized Using the Precipitation Method

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