Polyaniline-coated barium ferrite composites: Study on broadband electromagnetic interference shielding and humidity sensing properties
|Title||Polyaniline-coated barium ferrite composites: Study on broadband electromagnetic interference shielding and humidity sensing properties|
|Year of Publication||2016|
|Authors||Jennifer M, Maheshwari J, Faisal M|
|Keywords||Department of Science and Humanities|
This article highlights the microwave shielding and humidity sensing properties of polyaniline/barium ferrite (PAni/BaFe12O19) composites. The composites were synthesized by in-situ chemical oxidative polymerization of aniline in the presence of various compositions (10, 20, and 30 wt%) of barium ferrite. The spectroscopic characterizations of PAni/BaFe12O19 composites were performed using Fourier transform infrared (FTIR), X-ray diffraction (XRD) and scanning electron microscopy (SEM). As there is a greater need to develop materials with better electromagnetic interference (EMI) shielding properties over a large operating frequency range, the shielding measurements were carried out in the broad microwave spectrum covering the frequency range from 12 to 18 GHz (Ku-Band), relevant for practical applications. The study shows that all the composites have shown excellent microwave absorption behavior confirmed by the shielding effectiveness values in the range of 35 to 37 dB. The humidity sensing of the PAni/BaFe12O19 composites was discussed in terms of direct current (DC) resistance and change in resistance of the composites with respect to percentage relative humidity (% RH) exhibited almost linear behavior within a choose range of 20% to 90% RH. The observed synergetic effect and the possibility to tailor the properties of these composites by varying the concentration of BaFe12O19 content can be optimized to fabricate multifunctional materials.