Silica-coated iron nanocubes: Preparation, characterization and application in microwave absorption
Silica-coated iron nanocubes: Preparation, characterization and application in microwave absorption
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DOI：
10.1016/j.jcis.2009.09.017
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发表时间：
2010-01-01
影响因子：
9.9
通讯作者：
Xiao, Xiukun
中科院分区：
文献类型：
--
作者：
Ni, Xiaomin;Zheng, Zhong;Xiao, Xiukun
由金属铁核和无定形二氧化硅壳组成的新型立方纳米胶囊是通过简单的化学还原路线和 Stober 工艺制造的。通过X射线衍射(XRD)、场发射扫描电子显微镜(FESEM)、透射电子显微镜(TEM)、X射线光电子能谱仪(XPS)、傅里叶变换红外光谱仪(FTIR)、热重-差热分析(TG-DTA)、振动样品磁强计对制备的Fe@SiO2纳米立方体进行了表征。 (VSM) 和标量网络分析 (SNA)。与纯铁相比，二氧化硅包覆的铁纳米立方体表现出更好的磁性能、抗氧化性和微波吸收性能。对于厚度为 2 mm 的吸收体，在 8-14 GHz 频率范围内获得超过 - 12 dB 的反射损耗 (RI)，在 9 GHz 时最佳 RL 为 -18.2 dB。基于Fe@SiO2复合材料的磁性能和电磁理论，讨论了其提高微波吸收性能的机理。 (C) 2009 Elsevier Inc. 保留所有权利。
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@SiO2 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@SiO2 composite was discussed based on their magnetic properties and electromagnetic theory. (C) 2009 Elsevier Inc. All rights reserved.