Structural, dielectric and magnetic studies on polyaniline-decorated Ni_(0.5)Cu_(0.5)Fe_2O_4 nanoferrites for electromagnetic interference shielding applications

摘要

With the aim of developing effective electromagnetic interference (EMI) shielding materials, polyaniline-decorated Ni_(0.5)Cu_(0.5)Fe_2O_4 nanoferrites were synthesized via in situ polymerization method. Synthesized samples were characterized using different techniques such as X-ray diffraction analysis, field emission scanning electron microscopy, energy-dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy. Thermal behavior of polyaniline (PAni)/Ni_(0.5)Cu_(0.5)Fe_2O_4 composites is studied in the temperature range 25-700 ℃. Present Ni_(0.5)Cu_(0.5)Fe_2O_4 nanoparticles and PAni/Ni_(0.5)Cu_(0.5)Fe_2O_4 composites exhibited hysteretic behavior in the studied magnetic field range. Values of saturation magnetization and coercivity for Ni_(0.5)Cu_(0.5)Fe_2O_4 nanoparticles decrease with coating of polyaniline due to increase in particle-particle separation which reduces the inter-particle interaction. Maximum EMI shielding effectiveness (SE) values obtained for Ni_(0.5)Cu_(0.5)Fe_2O_4 nanoparticles and PAni/Ni_(0.5)Cu_(0.5)Fe_2O_4 composites are 11.54 dB and 66.56 dB, respectively. Secured higher SE values shows that the composites possess great potential in EMI shielding applications.