In recent years,two-dimensional inorganic materials(MoS_(2))have been promising candidates for EM wave absorber because of their high specific surface area,excellent electronic properties and dielectric loss caused by...In recent years,two-dimensional inorganic materials(MoS_(2))have been promising candidates for EM wave absorber because of their high specific surface area,excellent electronic properties and dielectric loss caused by polymorphism.Nevertheless,the poor impedance matching of individual MoS_(2) limited its microwave absorption performance.Optimizing the impedance matching of microwave absorber can be an effective way to achieve electromagnetic wave attenuation.In this study,we deposited CoFe_(2)O_(4) magnetic nanoparticles on the surface of MoS_(2) nanosheets using reasonable hydrothermal reactions to optimize its poor impedance and enhance interfacial polarization.The MC-6 composite(mMoS_(2):mCoFe_(2)O_(4)=6:1)exhibited excellent microwave absorption capability.The minimum reflection loss(RL)reached-55.3 dB at 16.24 GHz(Ku band)and the effective absorption bandwidth(<-10 dB)was measured to be 6.26 GHz(X band)with a thickness of 1.6 mm.This study confirms that optimizing impedance matching and interfacial polarization of MoS_(2)-based composites play a key role in the microwave response.Moreover,the reasonable optimization of impedance matching enables regulation of the effective bandwidth and strong absorption intensity.展开更多
基金We are thankful for financial support from the Aeronautics Science Foundation of China(No.:2017ZF52066)National Nature Science Foundation of China(No.:11575085)+1 种基金Qing Lan Project,Six talent peaks project in Jiangsu Province(No.XCL-035)Jiangsu 333 talent project,the Open Research Fund of Jiangsu Provincial Key Laboratory for Nanotechnology of Nanjing University,and the Priority Academic Program Development of Jiangsu Higher Education Institutions.
文摘In recent years,two-dimensional inorganic materials(MoS_(2))have been promising candidates for EM wave absorber because of their high specific surface area,excellent electronic properties and dielectric loss caused by polymorphism.Nevertheless,the poor impedance matching of individual MoS_(2) limited its microwave absorption performance.Optimizing the impedance matching of microwave absorber can be an effective way to achieve electromagnetic wave attenuation.In this study,we deposited CoFe_(2)O_(4) magnetic nanoparticles on the surface of MoS_(2) nanosheets using reasonable hydrothermal reactions to optimize its poor impedance and enhance interfacial polarization.The MC-6 composite(mMoS_(2):mCoFe_(2)O_(4)=6:1)exhibited excellent microwave absorption capability.The minimum reflection loss(RL)reached-55.3 dB at 16.24 GHz(Ku band)and the effective absorption bandwidth(<-10 dB)was measured to be 6.26 GHz(X band)with a thickness of 1.6 mm.This study confirms that optimizing impedance matching and interfacial polarization of MoS_(2)-based composites play a key role in the microwave response.Moreover,the reasonable optimization of impedance matching enables regulation of the effective bandwidth and strong absorption intensity.
