Synthesis and Magnetic Studies of Uniform Iron Nanorods and Nanospheres

Park, Sang-Jae; Kim, Seung-Soo; Lee, Jun Young; Khim, Z. G.; Char, K.; Hyeon, Taeghwan

doi:10.1021/ja001628c

Cited by 588 publications

(375 citation statements)

References 19 publications

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“…Banfield and coworkers [6] and more recently Weller et al [7] have discussed the concept of oriented attachment, in which anisotropic shapes are obtained by selective fusion of faceted nanocrystals along particular directions. Similar results have been found in Pt particles collapsing to form wires [8] and iron nanorods [9]. Other disk-like nanoparticles have been recently reported on the literature [10].…”

Section: Introductionsupporting

confidence: 87%

Synthesis of hcp-Co Nanodisks

et al. 2002

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ABSTRACT. hcp Co disk-shaped nanocrystals were obtained by rapid decomposition of cobalt carbonyl in presence of linear amines. Other surfactants, in addition to the amines, like phosphine oxides and oleic acid were used to improve size dispersion, shape control and nanocrystal stability. Co disks are ferromagnetic in character and they spontaneously self assemble into long ribbons. X-ray and electron diffraction, electron microscopy and SQUID magnetometry have been employed to characterize this material.

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Section: Introductionsupporting

confidence: 87%

Synthesis of hcp-Co Nanodisks

et al. 2002

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“…For example, silver nanocubes, 1 cobalt nanodiscs, 2,3 and iron nanorods 4 have been synthesized. It is believed that a surfactant or polymer plays an important role in the metallic nanoparticles synthesis and, particularly, in their shape control.…”

Section: Introductionmentioning

confidence: 99%

Controlled Crystalline Structure and Surface Stability of Cobalt Nanocrystals

et al. 2005

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The synthesis of monodispersed 10 nm cobalt nanocrystals with controlled crystal morphology and investigation of the surface stability of these nanocrystals are described. Depending on the surfactants used, single crystalline or multiple grain nanocrystals can be reproducibly produced. The relative surface stability of these nanocrystals is analyzed using the temperature dependences of the dc magnetic susceptibility. The novel method, which allows sensitive monitoring of the surface stability, is based on the observation that, with particle oxidation, an anomalous peak appears at 8 K in zero-field-cooled magnetization measurements. It is found that the surfactant protective layer is more important for long-term stability at room temperature, while the hightemperature oxidation rate is controlled by the crystal morphology of the nanoparticles.

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“…(25) Generally, smaller magnetite nanoparticles cause more chaotic motion and decrease in the magnetic moment. There is no remanance, and the coercivity is nearly zero.…”

Section: Resultsmentioning

confidence: 99%

“…There is no remanance, and the coercivity is nearly zero. Magnetization (M s ) and applied field (H) can be described by the Langevin equation: (25,26) …”

Section: Resultsmentioning

confidence: 99%

Particle Size Determination and Magnetic Characterization of Fe3O4 Nanoparticles Using Superconducting Quantum Interference Device Magnetometry

2016

Sensors and Materials

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Magnetic nanoparticles (MNPs) were synthesized by a chemical co-precipitation method, which produces monodisperse, nanosize, benign superparamagetic iron oxide nanoparticles (SPIONs) at a reduced synthesis temperature. The crystal structure, morphology, and magnetic characterization were determined by X-ray diffraction (XRD), transmission electron microscopy (TEM), and superconducting quantum interference device (SQUID) magnetometer, respectively. The XRD pattern shows that the presence of the most intense peak corresponds to the (311) crystallographic orientation of the spinel phase of Fe 3 O 4 MNPs. The crystallite size of 4-6 nm was determined from the XRD pattern by using the Scherrer approximation. A TEM image of the MNP showed the mean diameter of 18 ± 10 nm. Magnetization versus temperature (M-T) curve values were used to determine the blocking temperature and particle size by Néel-Arrhenius law and magnetization versus magnetic field (M-H) curve values were used to calculate the size of magnetic particles by the Langevin equation. The particle sizes were found to be 19 and 10 nm. The MNPs proved to be superparamagnetic by M-H characterization at 10 and 300 K.

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Synthesis and Magnetic Studies of Uniform Iron Nanorods and Nanospheres

Cited by 588 publications

References 19 publications

Synthesis of hcp-Co Nanodisks

Synthesis of hcp-Co Nanodisks

Controlled Crystalline Structure and Surface Stability of Cobalt Nanocrystals

Particle Size Determination and Magnetic Characterization of Fe3O4 Nanoparticles Using Superconducting Quantum Interference Device Magnetometry

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