Synthesis of magnetic cobalt ferrite nanoparticles with controlled morphology, monodispersity and composition: the influence of solvent, surfactant, reductant and synthetic conditions

Lu, Le Trong; Dung, Ngo Thanh; Tung, Le Duc; Thanh, Cao Thi; Quy, O. K.; Chuc, Nguyen Van; Maenosono, Shinya; Thanh, Nguyễn Thị Kim

doi:10.1039/c5nr04266f

Cited by 156 publications

(101 citation statements)

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“…At low reaction times spherical nanoparticles appear and, at increasing reaction times, nanocubes and, by prolonging the reaction time, spheric/cuboctahedral nanoparticles appear. This evolution has also been reported by other authors [12,30]. In fact, these changes in the morphology have been related to both the benzyl ether solvent amount and the refluxing time.…”

Section: Resultssupporting

confidence: 88%

“…In recent years, researchers have presented a significant interest in preparing CoFe 2 O 4 nanostructures with different sizes, morphology, and cobalt stoichiometry for potential application as biomedical materials [12]. Among other methods, thermal decomposition of iron(III) acetylacetonate, Fe(acac) 3 , and cobalt(II) acetylacetonate, Co(acac) 2 , or metal oleates in high-temperature solvents have been used for preparing CoFe 2 O 4 of different shapes and sizes by changing reaction times, temperature, surfactant concentration, solvent, or precursor ratios [12,13].…”

Section: Introductionmentioning

confidence: 99%

“…Among other methods, thermal decomposition of iron(III) acetylacetonate, Fe(acac) 3 , and cobalt(II) acetylacetonate, Co(acac) 2 , or metal oleates in high-temperature solvents have been used for preparing CoFe 2 O 4 of different shapes and sizes by changing reaction times, temperature, surfactant concentration, solvent, or precursor ratios [12,13]. This method usually yields more homogeneous nanoparticles, although it requires an ulterior transference to water media.…”

Section: Introductionmentioning

confidence: 99%

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Exploring Reaction Conditions to Improve the Magnetic Response of Cobalt-Doped Ferrite Nanoparticles

et al. 2018

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With the aim of studying the influence of synthesis parameters in structural and magnetic properties of cobalt-doped magnetite nanoparticles, Fe3−xCoxO4 (0 < x < 0.15) samples were synthetized by thermal decomposition method at different reaction times (30–120 min). The Co ferrite nanoparticles are monodisperse with diameters between 6 and 11 nm and morphologies depending on reaction times, varying from spheric, cuboctahedral, to cubic. Chemical analysis and X-ray diffraction were used to confirm the composition, high crystallinity, and pure-phase structure. The investigation of the magnetic properties, both magnetization and electronic magnetic resonance, has led the conditions to improve the magnetic response of doped nanoparticles. Magnetization values of 86 emu·g−1 at room temperature (R.T.) have been obtained for the sample with the highest Co content and the highest reflux time. Magnetic characterization also displays a dependence of the magnetic anisotropy constant with the varying cobalt content.

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Section: Resultssupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Exploring Reaction Conditions to Improve the Magnetic Response of Cobalt-Doped Ferrite Nanoparticles

et al. 2018

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“…Thanh et al [92] had similar findings, more specifically, in that case nanoparticle size and polydispersity increased with increasing reaction time on account of Ostwald ripening.…”

Section: Discussionsupporting

confidence: 64%

Cobalt Ferrite Nanoparticles Fabricated via Co-precipitation in Air: Overview of Size Control and Magnetic Properties

Toledo¹

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“…• C in polyol medium, 5 thermal decomposition and/or direct micellar routes from cobalt(II) acetylacetonate and iron(III)acetylacetonate, 6,7 co-precipitation and/or micelles methods from iron and cobalt chlorides, 8,9 hydrothermally from chlorides 10,11 or nitrates, 12 solvothermal from Fe chloride and Co acetate, 13 solution combustion 14 and sol-gel from cobalt and iron nitrates, 15,16 or cobalt and iron acetylacetonates. 3 Regarding other 3D structures based on cobalt ferrite, Co x Fe 3−x O 4 magnetic thin films have been grown on the pore walls of alumina membranes by atomic layer deposition.…”

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Properties of Zirconium Oxide and Cobalt Ferrite Layered Nanocomposite

Tamm

Joost

Mikkor

et al. 2017

ECS J. Solid State Sci. Technol.

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CoFe 2 O 4 nanoparticles with 3-30 nm in diameter were synthesized by sol-gel method. The particles were spread as a solid discontinuous layer over planar silicon and TiN substrates by spin coating and covered by 15 nm thick ZrO 2 films by atomic layer deposition. Crystal structures distinctively characteristic of CoFe 2 O 4 and ZrO 2 constituents were preserved. The nanocomposite CoFe 2 O 4 -ZrO 2 layers demonstrated dielectric polarization, saturative magnetization, and implications of resistive switching behavior. Behavior most clearly attributed to memory materials was observed in the field admittance characteristic with two distinct states in susceptibility of the nanocomposite. There is permanent and growing interest in complex compound materials for a variety of applications in which the components tailor their best structural, mechanical, optical or electronic properties making the material versatile for the planned applications. Metal oxide based layered systems can demonstrate a variety of resistive switching, ferroelectric, ferromagnetic and other properties useful in prospective devices.1 Cobalt-iron-oxygen ternary system has been of considerable interest, driven perhaps by the necessity of use it as a constituent compound in more complex structures exploited in solid oxide fuel cells. 2 Cobalt ferrite has been studied 3 as an attractive magnetic material suited to magneto-optical recording, integrated optics, or waveguides, due to its potential combination of semiconducting and magnetic properties including high coercivity, anisotropy, and magnetostriction.CoFe Regarding other 3D structures based on cobalt ferrite, Co x Fe 3−x O 4 magnetic thin films have been grown on the pore walls of alumina membranes by atomic layer deposition. 17 Cobalt ferrite in thin film form has also been prepared by spray pyrolysis using cobalt and iron nitrate precursors.18 Magnetization-field or Kerr loops with certain coercive force has earlier been recorded in CoFe 2 O 4 particles [3][4][5][6]8,10,14,16 and thin films, 18 in most cases at room temperature. Ferromagnetic CoFe 2 O 4 particles have been added to YBa 2 Cu 3 O 7-δ thin films to enhance flux pinning in potentially superconducting materials which, however, led to the formation of Y(Fe,Co)O 3 , leaving the host material yttrium-deficient. 19 On the other hand, dilute Fe and Co codoping into ZrO 2 has resulted in ferromagnetic behavior at room temperature for annealing temperatures above 900• C, suggesting that partial formation of secondary phases, such as cobalt ferrite, promoted ferromagnetism. 20 Very small CoFe 2 O 4 particles with diameter 4-6 nm alone have also demonstrated magnetization decreasing toward higher temperatures and have thus been described as superparamagnetic. 6,9 Coercive field decreased substantially with increasing temperature, although saturative magnetization could be achieved at room temperature as well. CoFe 2 O 4 particles embedded in SiO 2 /ZrO 2 host matrix have been studied and characterized as magneto-optical isolators and desc...

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Synthesis of magnetic cobalt ferrite nanoparticles with controlled morphology, monodispersity and composition: the influence of solvent, surfactant, reductant and synthetic conditions

Cited by 156 publications

References 51 publications

Exploring Reaction Conditions to Improve the Magnetic Response of Cobalt-Doped Ferrite Nanoparticles

Exploring Reaction Conditions to Improve the Magnetic Response of Cobalt-Doped Ferrite Nanoparticles

Cobalt Ferrite Nanoparticles Fabricated via Co-precipitation in Air: Overview of Size Control and Magnetic Properties

Properties of Zirconium Oxide and Cobalt Ferrite Layered Nanocomposite

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