Ni XM, Zheng Z, Hu X, Xiao XK (2010a) Silica-coated iron nanocubes: Preparation, characterization and application in microwave absorption. Journal of Colloid and Interface Science 341(1), 18-22. [In English]

Web link: http://dx.doi.org/10.1016/j.jcis.2009.09.017

Keywords:

Nanocubes, Iron, Silica coating, Microwave absorption, Magnetization, carbon nanotubes, nanoparticles, particles, metals, microstructure, superlattices, permeability, composite, oxidation

Abstract: Novel Cubic nanocapsules consisting of metallic iron core and amorphous Silica shell were fabricated through a simple chemical reduction route followed by a Stober process. Thus-prepared Fe@SiO(2) nanocubes were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), X-ray photoelectron spectrometer (XPS), Fourier transform infrared spectrometer (FTIR), thermogravimetry-differential thermal analysis (TG-DTA), vibrating sample magnetometer (VSM) and scalar network analysis (SNA). Comparing with that of pure iron counterparts, silica-coated iron nanocubes exhibited improved magnetic properties, oxidation resistance and microwave absorption performance. A reflection loss (RI,) exceeding - 12 dB was obtained in the frequency range of 8-14 GHz for an absorber thickness of 2 mm, with an optimal RL of -18.2 dB at 9 GHz. Mechanism of the improved microwave absorption properties of the Fe@SiO(2) composite was discussed based on their magnetic properties and electromagnetic theory. (C) 2009 Elsevier Inc. All rights reserved.