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Facile synthesis of FeCo layered double oxide/raspberry-like carbon microspheres with hierarchical structure for electromagnetic wave absorption.
Journal of Colloid and Interface Science ( IF 9.4 ) Pub Date : 2020-01-20 , DOI: 10.1016/j.jcis.2020.01.064
Hongjing Wu 1 , Zehao Zhao 1 , Guanglei Wu 2
Affiliation  

Transition metal compositions (Fe, Co and Ni) have always been promising candidates for electromagnetic wave (EMW) absorbers. In this study, the FeCo layered double hydroxide (LDH) supported on raspberry-like carbon spheres (RCs) was synthesized by a simple hydrothermal method and the spontaneous electrostatic self-assembly process. The surface FeCo-LDH is then transformed into FeCo layered double oxide (LDO) with different compositions after calcination treatment (650 °C and 700 °C), forming a typical hierarchical structure. The sample calcined at 700 °C exhibited an ultra-wide effective absorption bandwidth (fe) (RL < -10 dB) of 7.4 GHz (from 10.6 to 18.0 GHz) at the matched thickness of 2.2 mm. The remarkable EM wave absorption properties are attributed to the strong interface polarization due to the various phase boundaries in LDO shell as well as sufficient heterointerfaces between LDO shell and RCs. It should be emphasized that LDH is rarely used for EMW absorption, and the use of LDH positively charged characteristics to fabricate hierarchical materials is a meaningful attempt and confirms the potential of LDH in EMW absorbing materials.

中文翻译:

FeCo层状双层氧化物/覆盆子状碳微球的合成简便,具有电磁波吸收的分层结构。

过渡金属成分(Fe,Co和Ni)一直是电磁波(EMW)吸收剂的有希望的候选者。在这项研究中,通过简单的水热法和自发静电自组装过程合成了覆在树莓状碳球(RCs)上的FeCo层状双氢氧化物(LDH)。然后在煅烧处理(650°C和700°C)后,将表面的FeCo-LDH转变为具有不同成分的FeCo层状双氧化物(LDO),形成典型的分层结构。在700°C下煅烧的样品在2.2 mm的匹配厚度下显示出7.4 GHz(从10.6至18.0 GHz)的超宽有效吸收带宽(fe)(RL <-10 dB)。出色的EM波吸收特性归因于LDO外壳中各种相界以及LDO外壳与RC之间足够的异质界面,从而使界面极化很强。应该强调的是,LDH很少用于EMW吸收,使用LDH带正电的特性来制造分层材料是一种有意义的尝试,并证实了LDH在EMW吸收材料中的潜力。
更新日期:2020-01-21
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