Structural, electrical and EMI shielding property of carbon nanotube decorated magnetic/ceramic nanoparticles

Abstract

Abstract To protect against harmful electromagnetic interference (EMI), it is crucial to fabricate composite with high total electromagnetic shielding efficiency (SET); In this study, FeNi3-NiFe2O4-SiO2 nanoparticles (NPs) were synthesized using one-pot method and decorated on carbon nanotube’s (CNT) sidewall. The final product was magnetic-ceramic/conductive (FeNi3-NiFe2O4-SiO2/MWCNT) nanocomposite. The EMI shielding characteristic of FeNi3-NiFe2O4-SiO2 NPs and FeNi3-NiFe2O4-SiO2/MWCNT nanocomposite was investigated in the range of X and Ku frequency band. The results indicated the high total shielding effectiveness of the FeNi3-NiFe2O4-SiO2/MWCNT nanocomposite with a thickness of 3.5 mm which was 25dB (SET>20dB ~ 90%) at an entire frequency band. The EMI shielding effectiveness of nanocomposite was higher than that of nanoparticles, because of the multi wall carbon nanotube (MWCNT) improved the AC conductivity of nanoparticles. Overall, The FeNi3-NiFe2O4-SiO2/MWCNT nanocomposite is a promising shielding material which prevents from passing 95% of incident wave through itself.

Keywords

• Shielding effectiveness
• MWCNT
• NiFe2O4
• FeNi3
• SiO2