Abstract
Conducting polymer composites with suitable combination of two components in nanoscale are expected to facilitate wider applications of composites. In this study, polypyrrole (PPy)/multiwalled carbon nanotube (MWCNT) nanocomposites prepared by in situ chemical oxidative polymerization were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and UV–Vis spectroscopy. The electrical and dielectric properties were investigated using complex impedance technique. Complex dielectric permittivity, complex electric modulus and complex impedance variations were studied in the frequency range of 10 Hz–1 MHz. The dielectric attributes and conductivity data of different nanocomposites analyzed as a function of frequency revealed that the incorporation of MWCNT phase into polypyrrole matrix affects the electrical and dielectric properties of the composites. Humidity sensor measurements show that PPy/MWCNT can be effectively optimized as candidate for humidity detection. The nanocomposites were also studied for broadband EMI shielding applications by characterizing the materials in the 12‒18 GHz (Ku band) to understand the shielding properties. The absorption dominant shielding effectiveness (SE) observed in the range of ‒13 to ‒15 dB was stable with visible variation with varying concentration of MWCNT in PPy. The experimental results of dielectric characterization, humidity sensing and EMI shielding response reveal that PPy/MWCNT composite can be suitable multifunctional material for various applications.
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ACKNOWLEDGMENTS
The author (Madhusudhan C. K.) would like to thank Dean R and D, Principal and management of Vemana Institute of Technology, Koramangala, Bangalore for their support and encouragement. The authors thank Department of Polymer Science and Technology, SJCE College of Engineering, JSS Science and Technology University, Mysore, India for their support. Also, the authors would like to thank the management of PES University-Electronic City Campus, (formerly, PES Institute of Technology-Bangalore South Campus) Bangalore, India for their support and encouragement towards carrying out this work.
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Madhusudhan, C.K., Mahendra, K., Madhukar, B.S. et al. Multifunctional Polypyrrole/Multi-Walled Carbon Nanotube Composite Material: Dielectric, Humidity Sensing and Broadband EMI Shielding Properties. Polym. Sci. Ser. B 63, 280–290 (2021). https://doi.org/10.1134/S156009042103009X
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DOI: https://doi.org/10.1134/S156009042103009X