MOFs derived Co@C@MnO nanorods with enhanced interfacial polarization for boosting the electromagnetic wave absorption
| Autor: | Ying Lin, lingxiang Jin, Haibo Yang, Bo Wen, Yun Qiu, Yan Cheng |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
business.industry Reflection loss Nanoparticle 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Electromagnetic radiation 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Biomaterials Colloid and Surface Chemistry Etching (microfabrication) Specific surface area Optoelectronics Nanorod Dielectric loss 0210 nano-technology business Absorption (electromagnetic radiation) |
| Zdroj: | Journal of colloid and interface science. 602 |
| ISSN: | 1095-7103 |
| Popis: | In our work, CoMn-MOF-74 precursors are prepared with rough surface by etching method, and a large number of Co@C@MnO heterogeneous interfaces are engineered via a facile calcination process. By adjusting the etching time, the microstructures of the precursors can be tuned, resulting in a different number of heterogeneous interfaces between Co, carbon and MnO in the Co@C@MnO nanorods. Therefore, the Co@C@MnO nanorods achieve excellent EMW absorption performance, which can be attributed to the enhancement of dielectric loss induced by the enhanced interfacial polarization loss. Besides, the conduction loss and the multiple reflection induced by the porous carbon can enhance the dissipation of electromagnetic wave. The existence of Co nanoparticles is also conducive to the dissipation of electromagnetic wave by enhancing magnetic loss. The MnO@C nanorods with porous structures exhibit significantly enhanced electromagnetic wave absorption properties with the filler loading of 20 wt%, and a maximum reflection loss (RLmax) of −64.4 dB, and the bandwidth of RL less than −10 dB (90% absorption) is 6.7 GHz. Our work is expected to improve the specific surface area of MOFs precursors by etching method, thus making their derivatives have complex compositions and novel structures to achieve excellent electromagnetic wave absorption properties. |
| Databáze: | OpenAIRE |
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