Carbon Black in  Electromagnetic Interference Shielding Effectiveness of Lightweight Polypyrrole  in (C-Band and X-Band) Frequency Range

Ali  N. Obead; Nadia A.  Ali

doi:10.30526/39.1.4201

Authors

Ali N. Obead Department of Physics, College of Science, University of Baghdad, Baghdad, Iraq. https://orcid.org/0009-0005-3215-0702
Nadia A. Ali Department of Physics, College of Science, University of Baghdad, Baghdad, Iraq. https://orcid.org/0009-0006-5639-1428

DOI:

https://doi.org/10.30526/39.1.4201

Keywords:

Electromagnetic interference (EM) shielding, 8-12GHz, 5.2- 8GHz), A.C electrical conductivity, Dielectric constant properties, TGA-DSC

Abstract

EMI (Electromagnetic Interference) shielding apeara lot of attention of that electronic devices are being used more widely and reports design progress for shielding..The EMI of PPy/Carbon black synthesized different weight (0,1,3,5 wt.%) of C.B using chemical oxidation method at (3-7)°C and charactrized with X-ray diffraction , Fourier transformation , Field Emission scanning electron microscopy , Electrical conductivity, high Electromagnetic Shielding Effectiveness (SE) in a frequency range of 5.85- 8.2GHz(C-band), 8.20-12.40GHz (x-band),and thermal analyzed using differential thermal analysis(TGA-DSC). FTIR reveal the required functional groups that should be present in all nanocomposites. The dispersion and formed a network of conductive phases that composites had a rough surface and a porous structure of the carbon black particles, according to FESEM results. The PPy /C.B with the A.C conductivity (3.04*10^-3)S/ cm exhibited shielding efficiency SE in (C-band ) at( -33dB) is highly dependent on carbon black and thickness 1.5 mm , with the maximum SE attenuation recorded at 5wt% of carbon black being (-36dB )at 12 GHz. Also in( X-band ) that SE attenuation recorded being at 8GHz . All PPy/C.B nanocomposites exhibit decreasing dielectric properties (ɛ´, ɛ´´, tan δ) with increasing frequency .These nanocomposites demonstrate effective EMI shielding and can be used in various applications such as molecular electronics and microwave absorption materials. Test of TGA-DSC show that exothermic reactions with the dominating weight% take place in ( 25-800) °C, the glass transition temperatures (Tg) at low and high contents of PPy/C.B nanocomposites between ( 110-160 °C ) . The obtained values of Tg showed complete miscibility of most composites. Thermo-gravimetric analysis showed that the Carbon black in polypyrrole nanocomposites formula has highest thermal stability with improved degradation temperature at 660-669 ⁰C at 5% weight loss.

Author Biographies

Ali N. Obead, Department of Physics, College of Science, University of Baghdad, Baghdad, Iraq.

Department of Physics, College of Science, University of Baghdad, Baghdad, Iraq.
Nadia A. Ali, Department of Physics, College of Science, University of Baghdad, Baghdad, Iraq.

Department of Physics, College of Science, University of Baghdad, Baghdad, Iraq.

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