The electromagnetic property and microwave absorption of wormhole-like mesoporous carbons with different surface areas
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A sol–gel method has been utilized for synthesizing the wormhole-like mesoporous carbon (WMC), in which the gel skeleton can be regulated by using hydrofluoric acid and sulfuric acid. The electromagnetic characteristics of a series of WMCs with different surface areas embedded in paraffin at 15 wt% loading at 2–18 GHz were investigated. The electric conductivity of WMCs gradually increases with the decrease of surface area, leading to an increase in complex permittivity through dielectric loss. A minimum reflection loss (RL) value of −68.41 dB and a broader absorption band (reach 9.8 GHz) with RL values less than −10 dB are obtained, due to WMC’s well matching the characteristic impedance and dielectric loss, implying its great potential as a microwave absorbing material.
KeywordsMicrowave Absorption Complex Permittivity Mesoporous Carbon Reflection Loss Complex Permeability
This work was supported by the National Natural Science Foundation of China (Grant Nos. 51276044 and 51302043), the Science and Technology Program of Guangdong Province of China (Grant Nos. 2016A020221031, 2015B010135011, and 2015A050502047), and the Science and Technology Program of Guangzhou City of China (Grant No. 201508030018).
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Conflict of interest
The authors declare that they have no conflict of interest.