Journal
CARBON
Volume 175, Issue -, Pages 11-19Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2020.12.073
Keywords
SiC whiskers/Hollow carbon microsphere; Dielectric loss; Interfacial polarization; Electromagnetic wave absorption
Funding
- National Science Foundation for Excellent Young Scholars of China [21922815]
- National Natural Science Foundation of China [21975275]
- Scientific Research Foundation for Young Scientists of Shanxi Province [201801D221156]
- Department of Resource and Social Security of Shanxi Province
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The SiC whiskers/hollow carbon microspheres composite achieves excellent electromagnetic wave absorption performance by forming heterointerfaces.
The SiC whiskers/hollow carbon microspheres (SiCw/HCMS) were successfully synthesized by a combination of the spray drying technology and the carbothermal reduction method. The anchoring of SiCw on HCMS shells improves the thermostability of composites and induces the formation of new heterointerfaces between SiC whiskers and HCMS. Experimental characterizations together with DFT calculations show that compared to intrinsic defects and functional groups in SiCw/HCMS, the formed heterointerfaces trigger the separation of positive and negative charges and induce large dipole moments, resulting in the intensive dielectric polarization loss. Consequently, SiCw/HCMS samples achieve an excellent electromagnetic wave absorption, where the reflection loss value of SiCw/HCMS-1450 reaches to -48.60 dB at 8.0 GHz with a thickness of 2.6 mm and the maximum effective absorbing bandwidth is 4.34 GHz. This work investigates a deep insight into the relationship between interfacial polarization loss and the electromagnetic wave attenuation and designs a novel absorbent that exhibits great potential for electromagnetic wave absorption at high-temperature environments. (C) 2020 Elsevier Ltd. All rights reserved.
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