摘要
With the increasing usage of varied electronic devices,the induced electromagnetic interference(EMI)irradiation pollution has become a novel environmental pollution besides of water and air pollutions,drawing a great of interests from the scientists to address EMW radiation problem via designing various electromagnetic wave(EMW)absorbers,which is supposed to be with lightweight,thin thickness,wide effective absorbing bandwidth and strong absorbing capacity.One kind of the most attractive absorbers is magnetic carbon composites.Here,we successfully synthesized porous structural C/Fe composites by in-situ carbonization of pre-prepared Fe_(3)O_(4)/wood fibers at 1000℃.The EMW absorption property of C/Fe composites is excellent with a minimum RL value of-32.67 dB at 9.86 GHz,a matching thickness of 2.2 mm and a wide response bandwidth of 14.5 GHz.This excellent absorption performance is proved to be due to the continuous network of Fe_(3)O_(4)/Fe/Fe_(3)C hybrids,permitting optimal impedance matching,the strongest dielectric loss and the optimal magnetic loss.Moreover,the interface polarizations of Fe-Fe_(3)C and Fe_(3)O_(4)-Fe interfaces,are positive to improve the microwave absorption performance.
基金
the National Natural Science Foundation of China(No.61601227,31570552)
China Postdoctoral Science Foundation(No.2017M621598)
Nature Science Foundation of Jiangsu Province(No.BK20160939)
Natural Science Foundation of the Jiangsu Higher Education Institutions of China(No.16KJB180010)
Key University Science Research Project of Jiangsu Province(No.17KJA220004)
Student Practice Innovation and Training Program of Jiangsu Province(No.201710298017Z)
Student Practice Innovation and Training Program of Nanjing Forestry University(No.2017NFUSPITP105,2017NFUSPITP092).
