Fe3O4/FePc/Pc magnetic composites with high mechanical properties and thermal stabilities by in situ preparation

Xu, Mingzhen; Hu, Jinquan; Zou, Xingqiang; Dong, Shihua; Liu, Mengdie; Yang, Xulin; Liu, Xiaobo

doi:10.1007/s10965-013-0170-0

Cited by 5 publications

(2 citation statements)

References 37 publications

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“…Magnetite films are being investigated as magnetic electrodes for the injection of spin-polarized current into nonmagnetic materials such as organic films in spintronic devices. [3][4][5][6][7] In this sense, it is important to have more atoms which could provide spin-polarized states with a high density and a large P EF . Fig.…”

Section: Resultsmentioning

confidence: 99%

Half-metallicity induced by boron adsorption on an Fe₃O₄(100) surface

Sun

Pratt

Yamauchi

2015

Phys. Chem. Chem. Phys.

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The spin polarization of magnetite Fe3O4 is significantly reduced at its surfaces, which is unfavorable for the development of spintronic devices based on this material. In order to enhance the surface spin polarization, the Fe3O4(100) surface is modified here through the adsorption of boron (B) atoms and investigated using density functional theory (DFT) calculations. We find for the bulk-terminated and cation-redistributed surfaces that a band gap is opened in the spin-up electronic states due to the formation of a strong bond between the B atom and a surface oxygen atom, i.e., B adsorption induces half-metallicity at the Fe3O4(100) surface. Besides the surface Fe and O atoms, the adsorbed B atoms have a considerable density of -100% spin-polarized electronic states at the Fermi level, which might provide a means of improving the efficiency of spin injection into spintronic devices.

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Section: Resultsmentioning

confidence: 99%

Half-metallicity induced by boron adsorption on an Fe₃O₄(100) surface

Sun

Pratt

Yamauchi

2015

Phys. Chem. Chem. Phys.

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“…The composites showed better dispersion of the hybrids and higher interfacial bonding strength between the hybrids and the surrounding matrix compared with that of the normal Fe 3 O 4 -based polymer composites. 21,22 Polyimides (PIs) have been selected as the polymer matrices of composite materials for a wide range of applications due to their excellent thermal stabilities, chemical resistance, and mechanical properties. 23,24 Among various species of inorganic nanoparticles, a combination of magnetic iron oxides (such as Fe 3 O 4 ) with PI has attracted much attention because of its potential applications as wave absorbers, magnetic data storage, and electromagnetic interference shielding materials.…”

Section: Introductionmentioning

confidence: 99%

Preparation and magnetic and thermal properties of flexible polyimide films with iron nitrophthalocyanine-coated magnetite microspheres

Liu

Wang

et al. 2015

High Performance Polymers

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To effectively utilize the one-step solvent-thermal route to prepare iron (Fe)-nitrophthalocyanine/magnetite (Fe 3 O 4 ) hybrid microspheres, we have developed a novel series of flexible Fe 3 O 4 /Fe-phthalocyanine (FePc)/polyimide (PI) composite films with various Fe 3 O 4 /FePc nanoparticle loadings (15, 27, and 40 wt%) and imidized at different temperatures (200 C and 300 C). The morphology and structure of the composite films were monitored using scanning electron microscopy, Fourier transform infrared spectroscopy, and X-ray diffraction, and the hybrid microspheres were found uniformly dispersed in the polymer matrices without any agglomeration. Mechanical and thermal properties of the composites were also investigated. The observed results indicated enhanced thermal stabilities, dramatically increased tensile modulus, and increased glass transition temperatures of the composite films, with the increment in the content of inorganic nanoparticles. Besides that, the Fe 3 O 4 /FePc/PI magnetic films showed higher saturation magnetization (24.33 emu g À1 , 27 wt% Fe 3 O 4 /FePc loading) with high-temperature treatment compared with that of the Fe 3 O 4 /PI film (18.79 emu g À1 , 27 wt% Fe 3 O 4 loading). It proved to be an effective way to prevent Fe 3 O 4 nanoparticles from oxidizing by coating the nanoparticles with organic layer. The flexible composite films can easily be moved under a relatively low magnetic field, indicating them to be the high-performance absorbing materials in potential applications.

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Phthalocyanine-mediated interfacial self-assembly of magnetic graphene nanocomposites toward low-frequency electromagnetic wave absorption

Liu

Feng

et al. 2023

Chemical Engineering Journal

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Fe3O4/FePc/Pc magnetic composites with high mechanical properties and thermal stabilities by in situ preparation

Cited by 5 publications

References 37 publications

Half-metallicity induced by boron adsorption on an Fe₃O₄(100) surface

Half-metallicity induced by boron adsorption on an Fe₃O₄(100) surface

Preparation and magnetic and thermal properties of flexible polyimide films with iron nitrophthalocyanine-coated magnetite microspheres

Phthalocyanine-mediated interfacial self-assembly of magnetic graphene nanocomposites toward low-frequency electromagnetic wave absorption

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Fe3O4/FePc/Pc magnetic composites with high mechanical properties and thermal stabilities by in situ preparation

Cited by 5 publications

References 37 publications

Half-metallicity induced by boron adsorption on an Fe3O4(100) surface

Half-metallicity induced by boron adsorption on an Fe3O4(100) surface

Preparation and magnetic and thermal properties of flexible polyimide films with iron nitrophthalocyanine-coated magnetite microspheres

Phthalocyanine-mediated interfacial self-assembly of magnetic graphene nanocomposites toward low-frequency electromagnetic wave absorption

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Half-metallicity induced by boron adsorption on an Fe₃O₄(100) surface

Half-metallicity induced by boron adsorption on an Fe₃O₄(100) surface