摘要
Recently,developing carbon-based hybrid materials loaded with magnetic components has been generally regarded as a promising and practically feasible strategy when it comes to constructing lightweight electromagnetic wave absorbers.In the current work,reclaimed carbon black(CB)nanopowder was firstly produced by simple burning of wheat straw,which was then employed as sustainable carbon-based host materials(carrier)and successfully decorated Co@C nanoparticles via a simple thermal reduction process.Remarkably,both the as-fabricated nanocomposites and corresponding electromagnetic wave absorption performances could be effectively tuned by tailoring the dosage of the Co@C nanoparticles.The minimum reflection loss(RLmin)of–53.989 d B was achieved for CB/Co@C-2#at 2.28 mm thickness,meanwhile,CB/Co@C-3#was featured by a wide effective absorption band(EAB)of 6 GHz(6.72–12.72 GHz)at a 2.73 mm matching thickness,which covered the entire X band,suggesting that the CB/Co@C nanocomposites were an attractive candidate for electromagnetic wave absorber.According to the synergistic influence of dielectric loss and magnetic loss from CB and Co@C,respectively,as well as the properly matched impedance,a reasonable electromagnetic wave attenuation mechanism was illustrated.It is noteworthy that the preparation process of CB is a facile,recycled,and low-cost strategy for achieving nanoscale carbon-based absorbing materials,moreover,the CB/Co@C nanocomposites provide a reference for constructing lightweight dielectric-magnetic products with superb electromagnetic wave absorption performances.
基金
the National Natural Science Foundation of China(Nos.51672144,51572137,51702181,52072196,52002199,52002200)
the Major Basic Research Program of Natural Science Foundation of Shandong Province under Grant No.ZR2020ZD09
the Shandong Provincial Key Research and Development Program(SPKR&DP)under Grant No.2019GGX102055
the Natural Science Foundation of Shandong Province(Nos.ZR2019BEM042,ZR2020QE063)
the Innovation and Technology Program of Shandong Province under Grant No.2020KJA004
Guangdong Basic and Applied Basic Research Foundation(No.2019A1515110933)
the China Postdoctoral Science Foundation(No.2020M683450)
the Taishan Scholars Program of Shandong Province under No.ts201511034。
