Preparation of One-Dimensional CoFe<sub>2</sub>O<sub>4</sub> Nanostructures and Their Magnetic Properties

Wang, Zhongli; Liu, Xiaojuan; Lv, Mei; Chai, Ping; Liu, Yao; Zhou, Xuliang; Meng, Jian

doi:10.1021/jp802614v

Cited by 134 publications

(80 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Particles synthesized at pH 13 show the best dispersability (Table 2) has been observed in several systems (including ferrites), and is attributed to the crystal"s tendency to reduce the overall surface energy [34].…”

Section: Resultsmentioning

confidence: 93%

Size Control and Magnetic Property Trends in Cobalt Ferrite Nanoparticles Synthesized Using an Aqueous Chemical Route

et al. 2014

View full text Add to dashboard Cite

Cobalt ferrite (CoFe 2 O 4 ) is an engineering material which is used for applications such as magnetic cores, magnetic switches, hyperthermia based tumor treatment, and as contrast agents for magnetic resonance imaging. Utility of ferrites nanoparticles hinges on its size, dispersibility in solutions, and synthetic control over its coercivity. In this work, we establish correlations between room temperature co-precipitation conditions, and these crucial materials parameters. Furthermore post-synthesis annealing conditions are correlated with morphology, changes in crystal structure and magnetic properties. We disclose the synthesis and process conditions helpful in obtaining easily sinterable CoFe 2 O 4 nanoparticles with coercive magnetic flux density (H c ) in the range 5.5-31.9 kA/m and M s in the range 47.9-84.9 A.m 2 Kg -1 . At a grain size of ~54±2 nm (corresponding to 1073 K sintering temperature), multi-domain behavior sets in, which is indicated by a decrease in H c . In addition, we observe an increase in lattice constant with respect to grain size, which is the inverse of what is expected of in ferrites. Our results suggest that oxygen deficiency plays a crucial role in explaining this inverse trend. We expect the method disclosed here to be a viable and scalable alternative to thermal decomposition based CoFe 2 O 4 synthesis. The magnetic trends reported will aid in the optimization of functional CoFe 2 O 4 nanoparticles.

show abstract

Section: Resultsmentioning

confidence: 93%

Size Control and Magnetic Property Trends in Cobalt Ferrite Nanoparticles Synthesized Using an Aqueous Chemical Route

et al. 2014

View full text Add to dashboard Cite

show abstract

“…Magnetic properties of ceramic nanofiber systems have been widely studied [55,61,[89][90][91][92][93]. For example, Fe-doped TiO 2 -SnO 2 hybrid nano ber has been prepared via electrospinning method.…”

Section: Magnetic Propertiesmentioning

confidence: 99%

Electrospinning of ceramic nanofibers: Fabrication, assembly and applications

Wu¹,

Pan²,

Lin³

et al. 2012

J Adv Ceram

252

108

View full text Add to dashboard Cite

This paper provides a brief review of current research activities that focus on the synthesis and controlled assembly of inorganic nano bers by electrospinning, their electrical, optical and magnetic properties, as well as their applications in various areas including sensors, catalysts, batteries, filters and separators. We begin with a brief introduction to electrospinning technology and a brief method to produce ceramic nanofibers from electrospinning. We then discuss approaches to the controlled assembly and patterning of electrospun ceramic nanofibers. We continue with a highlight of some recent applications enabled by electrospun ceramic nano bers, with a focus on the physical properties of functional ceramic nanofibers as well as their applications in energy and environmental technologies. In the end, we conclude this review with some perspectives on the future directions and implications for this new class of functional nanomaterials. It is expected that this review paper can help the readers quickly become acquainted with the basic principles and particularly the experimental procedure for preparing and assembly of 1D ceramic nanofiber and its arrays.

show abstract

“…Hence it is urgently expected that CoFe 2 O 4 nanoribbons could perform more excellent magnetic properties. So far, only did Wang et al report the electrospinning synthesis of CoFe 2 O 4 nanoribbons in 2008 [11,12]. However, the coercivity recorded at room temperature was only about 400-900 Oe, which was not big enough for the practical applications.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, many groups have been committing to synthesize various one-dimensional (1D) CoFe 2 O 4 nanostructures (nanofibers, nanowires, nanotubes, and nanoribbons) through many approaches, such as anodized aluminum oxide template (AAO)-assisted sol-gel or electrodeposition [2,[7][8][9][10], electrospinning [1,[11][12][13][14][15][16], and so on [17,18]. Being different from nanoparticles and films, 1D nanostructures not only have unique geometrical dimensions being comparable to the key magnetic length such as exchange length or domain wall width [19], but also can be an ideal model to research the magnetic reversal, magnetic interaction, and magnetic domain configuration in low-dimensional magnetic materials [19,20].…”

Section: Introductionmentioning

confidence: 99%

Improved coercivity and considerable saturation magnetization of cobalt ferrite (CoFe2O4) nanoribbons synthesized by electrospinning

Jing

Jin

et al. 2015

J Mater Sci

View full text Add to dashboard Cite

Cobalt ferrite (CoFe 2 O 4 ) nanoribbons with high crystallinity and purity were synthesized by annealing the as-spun PVP/[Co(NO 3 ) 2 ?Fe(NO 3 ) 3 ] precursor nanoribbons at temperatures from 450 to 750°C in air, and they were certified to have an improved coercivity (H c ) and considerable saturation magnetization (M s ). Although all the prepared CoFe 2 O 4 nanoribbons presented an excellent ferromagnetism behavior at room temperature, their M s progressively increased with increasing annealing temperature but H c followed an opposite variation tendency. The maximum M s of about 80.3 emu g -1 of the nanoribbons annealed at 750°C was basically equal to the bulk value, and the maximum H c of about 1802 Oe of the nanoribbons annealed at 450°C, is larger than most of reported H c values of other one-dimensional CoFe 2 O 4 nanostructures by far. It suggested that the magnetization reverse processes of the CoFe 2 O 4 nanoribbons annealed at 450 and 550°C were dominated by the coherent rotation model, while that of the CoFe 2 O 4 nanoribbons annealed at 650 and 750°C were dominated by the growth of a reverse magnetic domain.

show abstract

Preparation of One-Dimensional CoFe₂O₄ Nanostructures and Their Magnetic Properties

Cited by 134 publications

References 37 publications

Size Control and Magnetic Property Trends in Cobalt Ferrite Nanoparticles Synthesized Using an Aqueous Chemical Route

Size Control and Magnetic Property Trends in Cobalt Ferrite Nanoparticles Synthesized Using an Aqueous Chemical Route

Electrospinning of ceramic nanofibers: Fabrication, assembly and applications

Improved coercivity and considerable saturation magnetization of cobalt ferrite (CoFe2O4) nanoribbons synthesized by electrospinning

Contact Info

Product

Resources

About

Preparation of One-Dimensional CoFe2O4 Nanostructures and Their Magnetic Properties

Cited by 134 publications

References 37 publications

Size Control and Magnetic Property Trends in Cobalt Ferrite Nanoparticles Synthesized Using an Aqueous Chemical Route

Size Control and Magnetic Property Trends in Cobalt Ferrite Nanoparticles Synthesized Using an Aqueous Chemical Route

Electrospinning of ceramic nanofibers: Fabrication, assembly and applications

Improved coercivity and considerable saturation magnetization of cobalt ferrite (CoFe2O4) nanoribbons synthesized by electrospinning

Contact Info

Product

Resources

About

Preparation of One-Dimensional CoFe₂O₄ Nanostructures and Their Magnetic Properties