核壳式Fe_3O_4@MnO_2复合微球的形貌可控制备及其微波吸收性能
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- 英文论文题名：Morphology-Controlled Synthesis and Tunable Microwave Absorbing Properties for Hierarchical Core-Shell Fe_3O_4@MnO_2 Microspheres
- 论文作者：乔明涛 ; 雷星锋 ; 马勇 ; 张秋禹
- 英文论文作者：Mingtao Qiao ; Xingfeng Lei ; Yong Ma ; Qiuyu Zhang ; Department of Applied Chemistry ; Northwestern Polytechnical University
- 年：2016
- 作者机构：西北工业大学应用化学系;
- 论文关键词：Fe_3O_4 ; 核壳结构 ; MnO_2 ; 电磁微波吸收
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第三十六分会：纳米材料合成与组装
- 语种：中文
- 分类号：TB34
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第三十六分会 ; 纳米材料合成与组装
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：192k
- 原文格式：D
- 会议级别：全国
摘要
一种简单的溶剂热法联合水热法制备了具有核壳式结构的Fe_3O_4@MnO_2复合微球,并通过调控水热反应体系的温度与酸度,得到了蘑菇状、蜂窝状和鸡冠花状三种不同形貌的复合微球。X射线衍射、扫面电子显微镜、透射电子显微镜、X射线能量色散光谱仪与N_2吸附-脱附等温曲线对三种不同形貌的核壳式Fe_3O_4@MnO_2复合微球进行分析表征,明确了了三种复合微球的尺寸大小、物质组成、表面形貌、微观结构以及BET比表面积。不同的结构赋予了三种复合微球不同的性能。微波吸收性能的分析结果表明蘑菇状与鸡冠花状的复合微球表现出较宽的吸收频带,而且鸡冠花状复合微球获得最强的吸收能力,其最小的反射损失值在11.2 GHz处可达-48.5 dB。微波吸收的机理分析揭示了优秀的电磁波吸收能力主要来自于良好的阻抗匹配、材料的导电损失、孔洞中的多次散射吸收以及Fe_3O_4核与MnO_2壳层之间强烈的界面极化。该工作不仅开发出了一种新型的微波吸收材料,同时,也为后续微波吸收材料的设计提供了新的平台。
hierarchical core-shell Fe_3O_4@MnO_2 composite microspheres with three different surface morphologies, namely mushroom-, honeycomb- and corolla-like architectures, have been synthesized. The components, microstructure, size and morphologies were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, energy dispersive X-ray spectroscopy and N_2 adsorption-desorption isotherms. Investigations of microwave absorbing properties indicate that mushroom-like and corolla-like Fe_3O_4@MnO_2 composite microspheres have very broad effective bandwidth in the frequency range of 2-18 GHz and the corolla-like composites exhibit the strongest absorbing capability with the minimum reflection loss value of-48.5 d B(11.2 GHz). In addition, the analysis of microwave absorbing mechanism reveals that the electromagnetic energy absorption mainly derives from the matching impedance, conductive loss, multiple scattering and absorption in the cavities, and the interfacial polarizations between Fe_3O_4 cores and MnO_2 shells.
hierarchical core-shell Fe_3O_4@MnO_2 composite microspheres with three different surface morphologies, namely mushroom-, honeycomb- and corolla-like architectures, have been synthesized. The components, microstructure, size and morphologies were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, energy dispersive X-ray spectroscopy and N_2 adsorption-desorption isotherms. Investigations of microwave absorbing properties indicate that mushroom-like and corolla-like Fe_3O_4@MnO_2 composite microspheres have very broad effective bandwidth in the frequency range of 2-18 GHz and the corolla-like composites exhibit the strongest absorbing capability with the minimum reflection loss value of-48.5 d B(11.2 GHz). In addition, the analysis of microwave absorbing mechanism reveals that the electromagnetic energy absorption mainly derives from the matching impedance, conductive loss, multiple scattering and absorption in the cavities, and the interfacial polarizations between Fe_3O_4 cores and MnO_2 shells.
引文
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