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Facile synthesis of coral cauliflower‐like polypyrrole hemispheres toward screening electromagnetic interference pollution
Author(s) -
Kulkarni Gopal,
Kandesar Priyanka,
Velhal Ninad,
Kim Haekyoung,
Puri Vijaya
Publication year - 2021
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.50447
Subject(s) - microwave , polypyrrole , reflection loss , materials science , electromagnetic shielding , absorption (acoustics) , electromagnetic radiation , polymerization , optoelectronics , polymer , optics , composite material , telecommunications , composite number , physics , computer science
In this study, coral cauliflower‐like polypyrrole (PPy) hemispheres are synthesized on an alumina substrate via a simple chemical oxidative polymerization route. The stony coral‐like morphology of PPy hemispheres acts as a conducting trap in absorbing electromagnetic (EM) radiation via multiple internal reflections. A PPy thin film deposited at 0.2 M pyrrole concentration shows a minimum reflection loss (RL) of −30.80 dB (99.9% microwave absorption) at the frequency of 14.2 GHz, and the highest total shielding effectiveness achieved is −18.3 dB at 16.8 GHz at 4.38 μm film thickness. The thin films exhibit excellent microwave absorption ability at low thicknesses, and the effective absorption bandwidth (RL < –10 dB) attains a high value of 2.2 GHz in the frequency range of 13–15.2 GHz. These findings can help researchers to enhance the EM wave absorption characteristics in a broad frequency region using lightweight intrinsically conducting polymers.