Microstructures and Multiferroic Properties of Electrospun BiFeO3 Nanofibers

Song, Jong-Han; Nam, Joong-Hee; Cho, Jungho; Kim, Byung-Ik; Chun, Myung‐Suk; Choi, Duck-Kyun

doi:10.3938/jkps.59.2308

Cited by 15 publications

(16 citation statements)

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“…For example, Wang et al [26] found Ms equals to 4.4 emu/g for nanofibers between 100 and 370 nm of diameter and grain sizes of 90 nm, while Baji et al [27] found Ms equals to 1.34 emu/g for nanofibers of 180 nm diameter, but with grain size of 30 nm. In addition, Song et al [28] found Ms of 28.8 emu/g for nanofibers of diameters of 200 nm, while Wu et al [29] observed an improvement on magnetic properties in nanofibers of approximately 100 nm diameter. Sakar et al [30] also observed the improvement of magnetic properties in fibers, rods and belts, finding that the nanobelts structures with dimensions between 100 and 150 nm had the highest Ms (approximately 1 emu/g).…”

Section: Magnetic Propertiesmentioning

confidence: 99%

“…Another solution of 2.4 g of PVP dissolved in 20 ml of 3:1 dimethylformamide (DMF)/acetone was prepared [26][27][28][29]. Both solutions were mixed and stirred for 3 h until complete homogeneity and transparency were observed; the final solution was named Solution A.…”

Section: Electrospinning Solutionsmentioning

confidence: 99%

“…Thus, one way to avoid its AFM is to suppress the formation of the helicoidally spin array, synthesizing, for example, nanoparticles with diameters lower than the period length [19][20][21][22][23], substituting the Bi sites for alkaline earth metals (Ba, Ca or Sr) [24] or the Fe ions for Co ions [25]. In this regard, the electrospinning of nanofibers of BiFeO 3 seems to have the potential to produce nanostructures with improved mag-netic properties [26][27][28][29][30]. Wang et al [26], for example, obtained electrospun nanofibers of BiFeO 3 with high magnetic properties after thermal treatment in Ar atmosphere, while Baji et al [27] also obtained high magnetic properties on electrospun fibers annealed in air.…”

Section: Introductionmentioning

confidence: 99%

“…Wang et al [26], for example, obtained electrospun nanofibers of BiFeO 3 with high magnetic properties after thermal treatment in Ar atmosphere, while Baji et al [27] also obtained high magnetic properties on electrospun fibers annealed in air. Song et al [28] made a throughout analysis of the influence of the polymer concentration, applied electric field (voltage V/work distance d) and annealing temperature on the structure and magnetic properties of electrospun BiFeO 3 nanofibers. The best magnetic nanofibers were the ones obtained by using 13.8 wt.…”

Section: Introductionmentioning

confidence: 99%

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Correlation between electrospinning parameters and magnetic properties of BiFeO3 nanofibers

Melo¹,

Santos²,

Gualdi³

et al. 2017

Electrospinning

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BiFeO 3 nanofibers of different morphologies and dimensions were produced by electrospinning varying the collector and thermal treatment. By thermogravimetric analyses (TGA) the thermal behavior of the as-spun nanofibers was studied. The morphology of the nanofibers was examined by transmission and scanning electron microscopy (TEM and SEM, respectively) while the chemical composition and crystal structure were analyzed by energy dispersive x-ray spectrometry (EDS) and wide angle x-ray diffraction (WAXD). A vibrating sample magnetometer (VSM) was used to evaluate the magnetic properties. Different types of mats with different nanofibers´dimen-sions were obtained; while some nanofibers were interconnected, others were completely separated and aligned. The thinnest nanofibers were obtained using an aluminum substrate with folds and after annealing at 550 ∘ C. All samples annealed at this temperature formed pure BiFeO 3 , while samples annealed at 550 and 750 ∘ C formed an additional Bi 2 Fe 4 O 9 phase. No iron impurities were detected; the crystallite size of all the nanofibers was between 30 and 36 nm. The saturation magnetization increased with the decrease of the nanofiber´s diameter and increase of nanofibers interconnectivity. Thus, this ferromagnetism behavior was attributed to the suppression of the spiral spin structure of BiFeO 3 (which has a 62 nm period) and to the morphology of interconnected nanofibers.

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Section: Magnetic Propertiesmentioning

confidence: 99%

Section: Electrospinning Solutionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Correlation between electrospinning parameters and magnetic properties of BiFeO3 nanofibers

Melo¹,

Santos²,

Gualdi³

et al. 2017

Electrospinning

View full text Add to dashboard Cite

show abstract

“…Oxide nanobers make up the largest group among electrospun inorganic nanobrous materials. [17][18][19] Currently, there are few reports that directly compare the properties of cylindrical nanobers to other nanober shapes. 2,[4][5][6] The application-specic performance of oxide nanobrous materials depends on the surface microstructure, crystallinity, chemical and phase composition, shape, surface morphology, porosity, and interconnectivity of individual bers.…”

Section: Introductionmentioning

confidence: 99%

Ribbon-like and spontaneously folded structures of tungsten oxide nanofibers fabricated via electrospinning

et al. 2015

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Tungsten oxide (WO 3 ) nanofibers with shapes ranging from cylindrical to ribbon-like were prepared by annealing electrospun polyvinylpyrrolidone/ammonium metatungstate (PVP/AMT) fibers. Formation of periodically folded "zigzag" patterns in PVP/AMT and WO 3 ribbon-like fibers was observed for the first time at the initial stage of the electrospinning process on the surface of a stationary substrate. Among methods tested (capillary needle, needleless dc-and ac-electrospinning), only the capillary needle dc-electrospinning process was effective in producing ribbon-like fiber structures. Annealing of such PVP/AMT fibers at 500 C in air led to the formation of 80 AE 10 nm thick WO 3 ribbons with a width-tothickness ratio of up to 50 : 1. Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), X-ray diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), and Raman spectroscopy were used to analyze the material. Analyses revealed that regardless the fiber's shape, the annealed oxide fibers were polycrystalline with a grain size of 60 AE 30 nm and consisted of the monoclinic phase of WO 3 . When compared to cylindrical fibers, the ribbon-like WO 3 nanofibers exhibited higher porosity but lower mechanical strength with increased width of the ribbon-like structure. Fig. 7 XPS (W4f, C1s, O1s, and N1s) spectra of (a) as prepared PVP/AMT ribbon-like nanofibers and (b) the resulting WO 3 fibers after thermal processing for 3 h at 500 C in the air; (c) FTIR spectra of PVP/AMT (top) and annealed WO 3 (bottom) fibers.This journal is

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Fabrication of One‐Dimensional Ferroelectric Nano‐ and Microstructures by Different Spinning Techniques and Their Characterization

Lusiola

Clemens

2016

Nanoscale Ferroelectrics and Multiferroics

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Microstructures and Multiferroic Properties of Electrospun BiFeO3 Nanofibers

Cited by 15 publications

References 0 publications

Correlation between electrospinning parameters and magnetic properties of BiFeO3 nanofibers

Correlation between electrospinning parameters and magnetic properties of BiFeO3 nanofibers

Ribbon-like and spontaneously folded structures of tungsten oxide nanofibers fabricated via electrospinning

Fabrication of One‐Dimensional Ferroelectric Nano‐ and Microstructures by Different Spinning Techniques and Their Characterization

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