Absorption-dominant electromagnetic interference(EMI)shielding materials are promising in reducing electromagnetic radiation pollution,but their preparation processes are usually difficult and unsuitable for large-sca...Absorption-dominant electromagnetic interference(EMI)shielding materials are promising in reducing electromagnetic radiation pollution,but their preparation processes are usually difficult and unsuitable for large-scale preparation.In this work,multiple folded Bi_(2)Se_(3)/PVDF nanocomposite films were fabri-cated by using a convenient tape-casting method and multiple folding,which can be easily extended in industrial applications.The EMI shielding effectiveness(SE)of the composite materials was investigated,which shows typical absorption-dominant behavior and can substantially reduce secondary reflections.Specifically,for the 35%(in volume)Bi_(2)Se_(3)/PVDF nanocomposite film,the SE_(A)of single-layered film with a thickness of 60 mm reaches 20 dB while SE_(R)is lower than 5 dB.After folding the film into eight layers,the SE_(A)increased to 50 dB while SE_(R)remains below 5 dB.This method provides an effective way to the fabrication of absorption-dominant electromagnetic absorption(EMA)and EMI shielding material.展开更多
基金supported by the National Natural Science Foundation of China(Grant No.51972032)BUPT Excellent Ph.D.Students Foundation(CX2021128).
文摘Absorption-dominant electromagnetic interference(EMI)shielding materials are promising in reducing electromagnetic radiation pollution,but their preparation processes are usually difficult and unsuitable for large-scale preparation.In this work,multiple folded Bi_(2)Se_(3)/PVDF nanocomposite films were fabri-cated by using a convenient tape-casting method and multiple folding,which can be easily extended in industrial applications.The EMI shielding effectiveness(SE)of the composite materials was investigated,which shows typical absorption-dominant behavior and can substantially reduce secondary reflections.Specifically,for the 35%(in volume)Bi_(2)Se_(3)/PVDF nanocomposite film,the SE_(A)of single-layered film with a thickness of 60 mm reaches 20 dB while SE_(R)is lower than 5 dB.After folding the film into eight layers,the SE_(A)increased to 50 dB while SE_(R)remains below 5 dB.This method provides an effective way to the fabrication of absorption-dominant electromagnetic absorption(EMA)and EMI shielding material.
