Facile synthesis of α-Fe2O3 hollow sub-microstructures, morphological control and magnetic properties

Zhang, Xuhong; Chen, Yanzhuo; Liu, Hui; Wei, Yu; Wei, Wei

doi:10.1039/c3ce40579f

Cited by 19 publications

(13 citation statements)

References 36 publications

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“…The inset in Fig. 1,2,10,12,33,34 The magnetization saturation (M s ), magnetization remanent (M r ) and coercivity (H c ) were about 3.12 emu g À1 , 0.1284 emu g À1 and 34 Oe for the a-Fe 2 O 3 nanoplates at 300 K, respectively. It was found that the product showed hysteresis in the low eld regime, suggesting that the as-prepared nanoplates exhibited ferromagnetic behavior at room temperature.…”

Section: Magnetic Propertiesmentioning

confidence: 97%

“…This is different from other hematite crystals in which no magnetization saturation was observed up to the maximum applied magnetic eld. 1,2,10,12,33,34 The magnetization saturation (M s ), magnetization remanent (M r ) and coercivity (H c ) were about 3.12 emu g À1 , 0.1284 emu g À1 and 34 Oe for the a-Fe 2 O 3 nanoplates at 300 K, respectively. In addition to its unique morphology, the high M s is ascribed to the high crystallinity of the sample proved by the XRD pattern (Fig.…”

Section: Magnetic Propertiesmentioning

confidence: 99%

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Effect of sequential morphology adjustment of hematite nanoplates to nanospindles on their properties and applications

et al. 2015

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We investigated the marked morphological changes of a-Fe 2 O 3 nanocrystals from nanoplates to nanospindles via an environmentally friendly hydrothermal route. An aqueous Fe salt was used as the precursor and the volume ratio of ammonia to ethylene glycol was varied. The product was uniform and obtained at a high yield. By simply increasing the ratio of the aqueous phase, the morphology could be continuously tuned from nanoplates to nanospindles with the (001) facets gradually disappearing. A fundamental understanding of the shape evolution was obtained via a series of characterizations including X-ray powder diffraction, scanning electron microscopy and transmission electron microscopy.The NO 3 À ions and NH 3 molecules played vital parts at increased temperatures, not only in the phase structure of the iron oxide, but also in the formation of different hematite morphologies with different properties. The decrease in the photocatalytic efficiency in the visible region with the change from nanoplates to nanospindles under the same conditions indicated that the increase in the number of exposed (001) facets promoted the photocatalytic performance. The magnetic and electrochemical properties of typical morphologies were investigated and showed the potential applications of the nanostructures in various fields. Time-dependent morphology and structural evolution of a-Fe 2 O 3 nanodrumsTo indicate the formation process and growth mechanism of the hematite nanodrums (sample S3), a detailed study of the Fig. 1 (a) XRD patterns and (b) FTIR spectra of typical samples.This journal is

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Section: Magnetic Propertiesmentioning

confidence: 97%

Section: Magnetic Propertiesmentioning

confidence: 99%

Effect of sequential morphology adjustment of hematite nanoplates to nanospindles on their properties and applications

et al. 2015

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“…It is well known that the magnetic properties of nanomaterials are closely related to their shape, size, crystallinity, and magnetization direction. The reduced H c value compared to that of a-Fe 2 O 3 hollow sub-microstructures [19] probably may be attributed to the lower surface/volume ratio and less shape anisotropy of a-Fe 2 O 3 microflowers.…”

Section: Resultsmentioning

confidence: 83%

PVP-assisted synthesis of flower-like hematite microstructures composed of porous nanosheets

Wang

Chen

et al. 2015

J Mater Sci: Mater Electron

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Novel flower-like hematite microstructures composed of many porous nanosheets were synthesized by a PVP-assisted process, and ferric chloride served as inexpensive and nontoxic iron source. The precursor was firstly prepared using ethylene glycol as solvent and urea as base media, and a-Fe 2 O 3 flowers were subsequently obtained by thermal treatment of the precursor powder in oxygen atmosphere at 450°C for 3 h. The phase purity and morphology of the samples were investigated by XRD, SEM, and TEM techniques. Such a-Fe 2 O 3 flowers possessed an average size of 2-3 lm and the thickness of assembled porous sheets was about 50 nm, and the shape was highly dependent on the dosage of PVP and reaction time, respectively. Magnetic measurement showed that the flower-like a-Fe 2 O 3 hierarchical microstructures possessed ferromagnetic nature with magnetization value of 0.97 emu/g at the maximum magnetic field and a coercivity of 260 Oe, respectively.

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“…S4b †) can be divided into three main peaks at 284.8, 286.3 and 288.8 eV, which can be attributed to C-C, C-O and C]O, respectively. 48,49 Fig. S4c † displays the high-resolution XPS spectrum of O 1s.…”

Section: †)mentioning

confidence: 99%

Template-free synthesis of 3D hierarchical amorphous aluminum oxide microspheres with broccoli-like structure and their application in fluoride removal

Kang

Tong

et al. 2015

RSC Adv.

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Facile synthesis of α-Fe2O3 hollow sub-microstructures, morphological control and magnetic properties

Cited by 19 publications

References 36 publications

Effect of sequential morphology adjustment of hematite nanoplates to nanospindles on their properties and applications

Effect of sequential morphology adjustment of hematite nanoplates to nanospindles on their properties and applications

PVP-assisted synthesis of flower-like hematite microstructures composed of porous nanosheets

Template-free synthesis of 3D hierarchical amorphous aluminum oxide microspheres with broccoli-like structure and their application in fluoride removal

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