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The article focuses on the suitability of electrically characterized polypyrrole-banana carbon (PPy-BC) nanocomposites for broadband electromagnetic interference (EMI) shielding application. The environmental-friendly polypyrrole (PPy)-banana carbon (BC) nanocomposites were synthesized via in situ chemical polymerization technique and were characterized using powder X-ray diffraction, FT-IR spectroscopy, scanning electron microscopy (SEM), and UV-Vis spectroscopy techniques. Frequency-dependent dielectric, impedance, loss tangent, and conductivity measurements were analyzed in detail in the frequency range of 20 Hz to 1 MHz. The EMI shielding efficiency (SE) of PPy-BC nanocomposites were performed in the broad frequency range of 12 GHz to 18 GHz (Ku band), relevant for practical applications. The EMI SE achieved for PPy-BC nanocomposites was in the range of * 12 to * 18 dB. The present investigation also explores the anticorrosion property of polypyrrole nanocomposites coatings on mild steel surface in 5 M hydrochloric acid solution through atomic absorption spectroscopy (AAS), potentiodynamic polarization, Nyquist plots, and SEM techniques. AAS studies revealed that corrosion inhibition efficiency increases with an increase in the concentration of polypyrrole nanocomposites. Electrochemical impedance measurements showed that charge transfer resistance values depend on the composites concentration. Obtained SEM results also support the AAS and electrochemical results. The observed electrical property and EMI shielding properties with anticorrosive behavior suggest that PPy-BC nanocomposites can be optimized for useful technological applications.

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