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Licensed Unlicensed Requires Authentication Published online by De Gruyter May 16, 2022

Study of the substrate surface treatment of flexible polypyrrole-silver composite films on EMI shielding effectiveness: theoretical and experimental investigation

Karim Benzaoui ORCID logo, Achour Ales, Ahmed Mekki, Abdelhalim Zaoui, Abdelmadjid Bouhemadou, Boudjemaa Bouaouina and Fethi Benyoubi
From the journal Frequenz


Conductive flexible polypyrrole-silver (PPy-Ag) composite films were prepared on Biaxial Oriented Polyethylene Terephthalate (BOPET) substrate with surfaces treated by (3-aminopropyl) trimethoxysilane (APTMS). The surface treatment was carried out to improve the adhesion, morphology, and electrical properties of the deposited film to enhance the Electromagnetic Interference Shielding Effectiveness (EMI-SE). APTMS grafting on the BOPET substrate was confirmed by X-ray Photoelectron Spectroscopy (XPS) and Atomic Force Microscopy (AFM) analyses. All structural, morphological, and electrical features of PPy-Ag raised from different AgNO3 molar ratio were investigated. The shielding effectiveness properties, experimentally determined for the synthesized PPy-Ag films were compared to those simulated analytically and numerically based on the transmission line matrix method (TLM). Both analytical and numerical models showed a good agreement with experimental measurements. The obtained results confirmed that the PPy-Ag films of 0.5 M/1 M molar ratio exhibits high EMI shielding performance of about 21 dB along with an electrical conductivity of 47 S/cm. Therefore, the treated surface flexible PPy-Ag films can be considered as potential candidate for high frequency electromagnetic interference shielding applications.

Corresponding author: Karim Benzaoui, Laboratoire CEM, UER-ELT, Ecole Militaire Polytechnique, EMP, BP 17 Bordj-El-Bahri, 16046, Alger, Algérie, E-mail:


K. Benzaoui is very thankful to Polytechnic Military School and Research Laboratory of Electronics and Electronic Systems Engineering, Cherchell, Tipaza, Algeria for their assistance with numerical analysis software and experimental measurements of EMI-SE. The authors would like to thank Mme H. Bakli, Mr M.Derradji, Mr. S. Hassani, Mr. S. HAMANI, Mr. M. BADROUNI and Mr. M.GUEZOUL and Mr. M.CHAALLAL for their help to perform the SEM, XPS, AFM, XRD characterizations, respectively.

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: None declared.

  3. Conflict of interest statement: The authors declare no conflicts of interest regarding this article.


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Received: 2021-09-23
Accepted: 2022-04-21
Published Online: 2022-05-16

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