Abstract
In this work, a very facile one-pot hydrothermal synthesis approach has been developed for the preparation of ultrathin magnetite nanoplates. The hydrothermal procedure was performed by aging ferrous hydroxide under anaerobic conditions, which is known as Schikorr reaction. Ethylene glycol (EG), which was introduced to the reaction as another solvent, played a critical role in the formation process of these nanoplates. Typically, hexagonal Fe3O4 nanoplates with a thickness of 10 to 15 nm and a side length of 150 to 200 nm have been synthesized with EG/H2O = 1:1 in experiments. Our data suggest that the thickness of Fe3O4 nanoplates decreases, and the shape of the nanoplate becomes more irregular when the concentration of EG increases. The as-prepared Fe3O4 nanoplates were highly crystallized single crystals and exhibited large coercivity and specific absorption rate coefficient.
Highlights
Magnetite (Fe3O4) is an attractive material for essential applications such as magnetic storage, ferrofluids, catalysts, chemical sensor, biological assays, and hyperthermia because of its magnetic features combined with nanosize and surface effects [1,2,3,4,5,6,7,8,9]
Synthesis In the typical synthetic procedure of the Fe3O4 nanoplates, nitrogen is bubbled through two solutions independently: (a) 54 ml of water-Ethylene glycol (EG) mixture containing NaOH to obtain the final concentration of 0.22 M NaOH and (b) 6 ml of FeSO4·7H2O dissolved in 10−2 M H2SO4 to obtain the final concentration of 2.4 × 10−2 M
The X-ray diffraction (XRD) pattern (Figure 1a) of the obtained material proves its crystalline nature of face-centered cubic structure, and the peaks match well with standard Fe3O4 reflections (JCPDS card no. 86–1354) [23]
Summary
Magnetite (Fe3O4) is an attractive material for essential applications such as magnetic storage, ferrofluids, catalysts, chemical sensor, biological assays, and hyperthermia because of its magnetic features combined with nanosize and surface effects [1,2,3,4,5,6,7,8,9]. A number of nanosized magnetite crystals with a variety of morphologies, such as nanoparticles, nanospheres, hollow spheres, nanorods, nanowires, nanotubes, nanorings, nanopyramids, nano-octahedra, and flowerlike nanostructures, have been prepared by a variety of chemistry-based processing routes, including coprecipitation, thermal decomposition, microemulsion, electrochemical synthesis, and solvothermal or hydrothermal synthesis [10,11,12,13,14,15]. We report a facile one-pot hydrothermal approach for the preparation of magnetite nanoplates by the famous Schikorr reaction. Iron(II) hydroxide can be oxidized by the protons of water to form iron(II,III) oxide and molecular hydrogen. This process is described by the Schikorr reaction [18,19,20]: ð1Þ
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