Electromagnetic shielding properties of polypyrrole/polyester composites in the 1–18 GHz frequency range |
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| Affiliation: | 1. School of Engineering and Information Technology, Deakin University, Geelong 3217, Australia;2. Defence Science and Technology Organisation, P.O. Box 4331, Melbourne 3001, Australia;1. Aeronautical Development Agency, Indian Institute of Science, PB No 1718, Bengaluru 560012, India;2. Department of Materials Engineering, Indian Institute of Science, Bengaluru 560012, India;3. Interdisciplinary Centre for Energy Research (ICER), Indian Institute of Science, Bengaluru 560012, India;4. Department of Electrical and Communication Engineering, Indian Institute of Science, Bengaluru 560012, India;1. Centre of Polymer Systems, Tomas Bata University in Zlín, 760 01, Zlín, Czech Republic;2. Faculty of Mathematics and Physics, Charles University, 180 00, Prague 8, Czech Republic;3. Faculty of Chemical Engineering, University of Chemistry and Technology, Prague, 166 28, Prague 6, Czech Republic;1. Key Laboratory of Textile Science & Technology of Ministry of Education, College of Textiles, Donghua University, Shanghai 201620, PR China;2. Innovation Center for Textile Science and Technology, Donghua University, Shanghai 200051, PR China;3. College of Textiles & Fashion, Anhui Polytechnic University, Wuhu 241000, PR China;1. University Centre for Research and Development, Chandigarh University, Gharuan, Mohali, Punjab 140413, India;2. Department of Materials Science and Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India;1. Young Researchers and Elites Club, Yadegar-e-Imam Khomeini (RAH) Shahre Rey Branch, Islamic Azad University, Tehran, Iran;2. Research and Development Laboratory, PRE Labs Inc., 3302 Appaloosa Road, Unit 3, Kelowna, British Columbia, V1V 2W5, Canada |
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| Abstract: | The dielectric characteristics of conducting polymer-coated textiles in the frequency range 1–18 GHz were investigated using a non-contact, non-destructive free space technique. Polypyrrole coatings were applied by solution polymerization on fabric substrates using a range of concentrations of para-toluene-2-sulfonic acid (pTSA) as dopant and ferric chloride as oxidant. The conducting polymer coatings exhibited dispersive permittivity behaviour with a decrease in real and imaginary components of complex permittivity as frequency increased in the range tested. Both the permittivity and the loss factor were affected by the polymerization time of the conductive coating. It was found that the total shielding efficiency of these conductive fabrics is significant at short polymerization times and increases to values exceeding 80% with longer polymerization times. The reflection contribution to electromagnetic shielding also increases with polymerization time. |
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