Shape-Controlled Synthesis and Magnetic Properties of Monodisperse Fe₃O₄ Nanocubes

Abstract

Monodisperse Fe3O4 nanocubes have been successfully synthesized by a facile solvothermal method at 260 °C in the presence of oleic acid and oleylamine. Well-defined assembly of uniform Fe3O4 nanocubes with an average size of 12 nm could be obtained without a size-selection process. The shape of as-prepared Fe3O4 nanoparticles could be reversibly interchanged between spheres and cubes by adjusting the reaction parameters. The phase structures, morphologies, and sizes of as-prepared products were investigated in detail by X-ray diffraction (XRD), transmission electron microscopy (TEM), and high-resolution transmission electron microscopy (HRTEM). The magnetic properties of Fe3O4 nanocubes were measured by using a quantum design superconducting quantum interference device (SQUID). The magnetic study reveals that the as-synthesized nanocubes are ferromagnetic at 2 K while they are superparamagnetic at 300 K.

Preparation and characterization of poly(glycidyl methacrylate)-grafted magnetic nanoparticles: Effects of the precursor concentration on polyol synthesis of Fe3O4 and [PMDETA]0/[CuBr2]0 ratios on SI-AGET ATRP

“…6 Control of the size and different morphologies (spherical, octahedral and cubic) of monodisperse Fe 3 O 4 NPs is very important because these various structures generate distinct properties. 7 To understand magnetic behavior and to improve applications, careful research related to synthetic strategies and growth mechanisms of Fe 3 O 4 NPs are essential.…”

Influence of Reaction Solvent on Crystallinity and Magnetic Properties of MnFe2O4Nanoparticles Synthesized by Thermal Decomposition

“…The enhancement in the magnetic properties of MFO-1 nanoparticles can be attributed to their high crystallinity and magnetite structure, as demonstrated above, where the reductive environment provided by benzyl ether is a dominant contribution factor. Gao et al had reported that Fe 3 O 4 nanoparticles with high values were obtained in octadecene when excess amount of OAm was used (10 mL of OAm was used, while the amount of Fe(acac) 3 was 1 mmol) [20]. In contrast, only 1.5 mmol of OAm was used for synthesis of MFO-3.…”

Gd-Doped Superparamagnetic Magnetite Nanoparticles for Potential Cancer Theranostics

“…Although the effect of shape of MNP on their magnetic properties is not extensively studied, a few investigations have been reported in the literature on ferrite nanocubes, maghemite nanorods, NiFe wires, cobalt nanodiscs, tetrapods, and Au-MnO nanoflowers showing a strong dependence of M s on the shapes of the nanoparticles [27][28][29][30][31][32][33][34][35][36]. Higher M s values have been observed for the cubic MNP compared to the spherical MNP of the same size [37].…”