Excellent lightweight carbon-based microwave absorbers derived from metal–organic frameworks with tunable electromagnetic properties,Inorganic Chemistry Frontiers

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Excellent lightweight carbon-based microwave absorbers derived from metal–organic frameworks with tunable electromagnetic properties
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2020-03-11 , DOI: 10.1039/d0qi00099j
Weihua Gu _{1,

2,

3,

4} , Jing Zheng _{4,

5,

6,

7,

8} , Xiaohui Liang _{1,

2,

3,

4} , Xiaoqing Cui _{1,

2,

3,

4} , Jiabin Chen _{1,

2,

3,

4} , Zhu Zhang _{1,

2,

3,

4} , Guangbin Ji _{1,

2,

3,

4}

Affiliation

Metal–organic frameworks (MOFs) have attracted extensive interest owing to their tunable compositions and large specific surface areas. Herein, Fe₃O₄@carbon and Fe₃C@carbon composites were fabricated from iron-based MOFs (MIL-53(Fe)) via a facile hydrothermal and calcination process. Based on the Gibbs free energy theory, nanocrystal transformation from Fe₃O₄ to Fe₃C can be well controlled when the calcination temperature is above 689 °C, revealing that the temperature plays key roles in improving the electromagnetic parameters and microwave absorbing performance. Using elaborately designed MIL-53(Fe) as a precursor for carbon-based lightweight microwave absorbers, a minimum reflection loss (RL_min) value of −30.48 dB at a very thin matching thickness of only 1.4 mm and an effective microwave bandwidth of 4.40 GHz (from 13.6 to 18 GHz) can be achieved. It is believed that this work can arouse interest to further exploit metal–organic frameworks for lightweight carbon-based microwave absorbers.

中文翻译：

出色的轻质碳基微波吸收剂，源自具有可调节电磁特性的金属有机框架

金属有机骨架（MOF）由于其可调节的成分和较大的比表面积而引起了广泛的关注。在此，Fe ₃ O ₄碳和Fe ₃ C碳复合材料是由铁基MOFs（MIL-53（Fe））通过简便的水热和煅烧过程制成的。基于吉布斯自由能理论，纳米晶由Fe ₃ O ₄转变为Fe ₃当煅烧温度高于689°C时，可以很好地控制C，这表明温度在改善电磁参数和微波吸收性能方面起着关键作用。使用精心设计的MIL-53（Fe）作为碳基轻型微波吸收器的前体，在仅1.4 mm的非常薄的匹配厚度和4.40的有效微波带宽下，最小反射损耗（RL _min）值为-30.48 dB可以达到GHz（从13.6到18 GHz）。相信这项工作可以引起人们对进一步开发轻质碳基微波吸收器的金属有机框架的兴趣。

更新日期：2020-04-24

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