Hematite nanoplates: Controllable synthesis, gas sensing, photocatalytic and magnetic properties

Hao, Hongying; Sun, Dandan; Xu, Yanyan; Liu, Ping; Zhang, Guoying; Sun, Yijing; Gao, Dong‐Zhao

doi:10.1016/j.jcis.2015.10.012

Cited by 43 publications

(25 citation statements)

References 56 publications

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“…The values of the coercivity, remanent magnetization, and saturation magnetization are HC=2340 Oe, Mr=0.17 emu/g and MS=0.53 emu/g, respectively. It is interesting that the investigated α-Fe2O3 plate-like nanoparticles in this work reveal higher coercivity compared with the hematite platelike particles reported in the literature [50][51][52][53]. This observation can be assigned to the core-shell structure and plate-like morphology.…”

Section:  supporting

confidence: 54%

“…Nanosized iron oxide polymorphs (α-Fe2O3, γ-Fe2O3, Fe3O4, β-Fe2O3 and ε-Fe2O3) have been the subject of numerous studies in the past ten years due to their unique structural properties, complex magnetic properties and the great diversity of practical applications [1][2][3][4][5][6][7][8][9][10]. Key requirements for the safe use of these nanomaterials for practical applications are low toxicity and high stability.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of core-shell hematite (α-Fe2O3) nanoplates: Quantitative analysis of the particle structure and shape, high coercivity and low cytotoxicity

Tadić

Kopanja

Panjan

et al. 2017

Applied Surface Science

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Please cite this article as: Marin Tadic, Lazar Kopanja, Matjaz Panjan, Slavko Kralj, Jasmina Nikodinovic-Runic, Zoran Stojanovic, Synthesis of core-shell hematite (␣-Fe2O3) nanoplates: quantitative analysis of the particle structure and shape, high coercivity and low cytotoxicity, Applied Surface Science http://dx. 2 Graphical abstractHighlights  Uniform plate-like nanopartices are synthesized by hydrothermal method. Low-citotoxicity of hematite nanoplates is observed. High coercivity of the sample point to the shape anisotropy. Shape and structure of the nanoplates are analysed by computational methods. AbstractHematite core-shell nanoparticles with plate-like morphology were synthesized using a one-step hydrothermal synthesis. An XRPD analysis indicates that the sample consist of single-phase α-Fe2O3 nanoparticles. SEM and TEM measurements show that the hematite sample is composed 3 of uniform core-shell nanoplates with 10-20 nm thickness, 80-100 nm landscape dimensions (aspect ratio ~5) and 3-4 nm thickness of the surface shells. We used computational methods for the quantitative analysis of the core-shell particle structure and circularity shape descriptor for the quantitative shape analysis of the nanoparticles from TEM micrographs. The calculated results indicated that a percentage of the shell area in the nanoparticle area (share [%]) is significant. The determined values of circularity in the perpendicular and oblique perspective clearly show shape anisotropy of the nanoplates. The magnetic properties revealed the ferromagnetic-like properties at room temperature with high coercivity HC=2340 Oe, pointing to the shape and surface effects. These results signify core-shell hematite nanoparticles' for practical applications in magnetic devices. The synthesized hematite plate-like nanoparticles exhibit low cytotoxicity levels on the human lung fibroblasts (MRC5) cell line demonstrating the safe use of these nanoparticles for biomedical applications.

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Section:  supporting

confidence: 54%

Section: Introductionmentioning

confidence: 99%

Synthesis of core-shell hematite (α-Fe2O3) nanoplates: Quantitative analysis of the particle structure and shape, high coercivity and low cytotoxicity

Tadić

Kopanja

Panjan

et al. 2017

Applied Surface Science

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“…The magnetite behaves almost as an electrical metallic conductor, while the hematite phase displays electrical insulating property [6]. As examples, hematite can be used as an anode for a lithium-ion battery [13] or for photoelectrochemical water splitting [14], as pigment [15] [16] [17], in waste water treatment [18], 3 as a gas sensor [19] [20], or in catalysis [21]. Magnetite can be employed in biomedical [22] [23], magnetic printing [24] [25], in microelectronics as a microwave-absorbing materials [26][27] [28] [29], in thermoelectricity [30], or as a thermistor in a bolometer [31].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of iron oxide films by reactive magnetron sputtering assisted by plasma emission monitoring

Aubry

Liu

Dekens

et al. 2019

Materials Chemistry and Physics

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Iron oxide films were synthesized by pulsed-DC magnetron sputtering from a metallic target in Ar and O2 gas mixtures. Plasma emission monitoring was implemented to accurately control the metalto-oxygen ratio in the coating through the chemical state of the iron target. The intensity of the Fe* emission line was maintained at a given value (setpoint) in regulating the introduced oxygen flow rate. In addition, the oxidation rate of the growing film was adjusted by controlling the oxidationto-deposition rate ratio as a function of the position of the substrates relative to the magnetron axis.The iron oxide films were characterized by X-ray diffraction, UV-VIS spectrophotometry, electrical measurement and vibrating sample magnetometry. In addition to the crystallization of 2 pure hematite and magnetite phases, both phases coexist in a transition domain for a short range of setpoint depending on the oxidation-to-deposition rate ratio. The electrical, optical and magnetic behaviors of the FeOx films suggest that the relative proportion of phases can be tailored in this range. The FeOx film behaviors can then be tuned from the hematite semi-conductor properties to the semi-metallic magnetite properties.

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“…Gas Sensor Fabrication and Sensing Performance Measurement: The gas‐sensing property was evaluated using a WS‐30A sensor measurement system (WeiSheng Electronics Co. Ltd., Henan, China). The structure/fabrication procedure of the α‐Fe 2 O 3 nanoparticles gas sensor and the testing method were similar to those in our previous report . In brief, the sensing materials were dispersed in ethanol and coated onto the surface of an alumina ceramic tube between a pair of gold electrodes and platinum wires to form a thin film.…”

Section: Methodsmentioning

confidence: 99%

α‐Fe₂O₃ Polyhedral Nanoparticles Enclosed by Different Crystal Facets: Tunable Synthesis, Formation Mechanism Analysis, and Facets‐dependent n‐Butanol Sensing Properties

Tian

Sun

et al. 2019

Zeitschrift anorg allge chemie

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Three kinds of polyhedral α‐Fe2O3 nanoparticles enclosed by different facets including oblique parallel hexahedrons (op‐hexahedral NPs), cracked oblique parallel hexahedrons (cop‐hexahedral NPs), and octadecahedral nanoparticles (octadecahedral NPs), were successfully prepared by simply changing only one reaction parameter in the hydrothermal process. The structural and morphological of the products were systematically studied using various characterizations including X‐ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM), revealing that the three kinds of α‐Fe2O3 nanoparticles were enclosed by {104}, {110}/{104}, and {102}/{012}/{104} crystal planes, respectively. The exposed facets and shape of the nanocrystals were found to be affected by the adding amount of ethylene glycol in the solvent. The gas‐sensing properties and mechanism of the α‐Fe2O3 samples were studied and analyzed, which indicated that the sensitivity of the three samples followed the order of octadecahedral NPs > cop‐hexahedral NPs > op‐hexahedral NPs due to the combined effects of specific surface area and oxygen defects in the nanocrystals.

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Hematite nanoplates: Controllable synthesis, gas sensing, photocatalytic and magnetic properties

Cited by 43 publications

References 56 publications

Synthesis of core-shell hematite (α-Fe2O3) nanoplates: Quantitative analysis of the particle structure and shape, high coercivity and low cytotoxicity

Synthesis of core-shell hematite (α-Fe2O3) nanoplates: Quantitative analysis of the particle structure and shape, high coercivity and low cytotoxicity

Synthesis of iron oxide films by reactive magnetron sputtering assisted by plasma emission monitoring

α‐Fe₂O₃ Polyhedral Nanoparticles Enclosed by Different Crystal Facets: Tunable Synthesis, Formation Mechanism Analysis, and Facets‐dependent n‐Butanol Sensing Properties

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Hematite nanoplates: Controllable synthesis, gas sensing, photocatalytic and magnetic properties

Cited by 43 publications

References 56 publications

Synthesis of core-shell hematite (α-Fe2O3) nanoplates: Quantitative analysis of the particle structure and shape, high coercivity and low cytotoxicity

Synthesis of core-shell hematite (α-Fe2O3) nanoplates: Quantitative analysis of the particle structure and shape, high coercivity and low cytotoxicity

Synthesis of iron oxide films by reactive magnetron sputtering assisted by plasma emission monitoring

α‐Fe2O3 Polyhedral Nanoparticles Enclosed by Different Crystal Facets: Tunable Synthesis, Formation Mechanism Analysis, and Facets‐dependent n‐Butanol Sensing Properties

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Product

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α‐Fe₂O₃ Polyhedral Nanoparticles Enclosed by Different Crystal Facets: Tunable Synthesis, Formation Mechanism Analysis, and Facets‐dependent n‐Butanol Sensing Properties