MOFs derived Co@C@MnO nanorods with enhanced interfacial polarization for boosting the electromagnetic wave absorption

Author(s):  
Yun Qiu ◽  
Bo Wen ◽  
Haibo Yang ◽  
Ying Lin ◽  
Yan cheng ◽  
...  
Author(s):  
Bo Wen ◽  
Haibo Yang ◽  
Ying Lin ◽  
Liang Ma ◽  
Yun Qiu ◽  
...  

Electromagnetic wave absorbents with hierarchically porous and core-shell structures have significantly positive influence on electromagnetic wave absorption because of the enhanced interfacial polarization. Furthermore, the core-shell structure also introduces components...


2020 ◽  
Vol 12 (10) ◽  
pp. 1433-1440
Author(s):  
Shengnan Li ◽  
Mu Zhang

Due to the low density and high conduction loss of carbonaceous materials, they have been considered as candidates for compositing electromagnetic wave absorbing materials. In this study, the well-designed CNT@TiO2 composites with pearl necklace structure were successfully synthesized via a facile hydrolyzation method. The absorption performances of CNT@TiO2 under different loading ratio were characterized and showed significantly different performance on the electromagnetic wave absorption. The reflection loss value reaches to –47.5 dB in the pearl necklace structured CNT@TiO2 composites obtained with a thickness of 1.6 mm at 11.2 GHz. An effective absorption bandwidth was found to reach to 4.2 GHz with a coating thickness of 1.4 mm. More, the absorption frequency range can be diverse by adjusting coating thickness. We deduce that promising electromagnetic wave absorbing property of the composites is related to the interfacial polarization induced by pearl necklace structure, improved impedance matching, conduction loss and scattering within the materials.


2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Jing Qiao ◽  
Xue Zhang ◽  
Chang Liu ◽  
Longfei Lyu ◽  
Yunfei Yang ◽  
...  

Highlights Non-magnetic bimetallic MOF-derived porous carbon-wrapped TiO2/ZrTiO4 composites are firstly used for efficient electromagnetic wave absorption. The electromagnetic wave absorption mechanisms including enhanced interfacial polarization and essential conductivity are intensively discussed. Abstract Modern communication technologies put forward higher requirements for electromagnetic wave (EMW) absorption materials. Metal–organic framework (MOF) derivatives have been widely concerned with its diverse advantages. To break the mindset of magnetic-derivative design, and make up the shortage of monometallic non-magnetic derivatives, we first try non-magnetic bimetallic MOFs derivatives to achieve efficient EMW absorption. The porous carbon-wrapped TiO2/ZrTiO4 composites derived from PCN-415 (TiZr-MOFs) are qualified with a minimum reflection loss of − 67.8 dB (2.16 mm, 13.0 GHz), and a maximum effective absorption bandwidth of 5.9 GHz (2.70 mm). Through in-depth discussions, the synergy of enhanced interfacial polarization and other attenuation mechanisms in the composites is revealed. Therefore, this work confirms the huge potentials of non-magnetic bimetallic MOFs derivatives in EMW absorption applications.


2021 ◽  
Vol 854 ◽  
pp. 157259
Author(s):  
Fatai Adisa Wahaab ◽  
Wasiu Yahya ◽  
Lawal Lanre Adebayo ◽  
Issa Kazeem ◽  
Abdulganiyu Abdulraheem ◽  
...  

2010 ◽  
Vol 25 (8) ◽  
pp. 829-834 ◽  
Author(s):  
Cheng BI ◽  
Mei-Fang ZHU ◽  
Qing-Hong ZHANG ◽  
Yao-Gang LI ◽  
Hong-Zhi WANG

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