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- Title
Ultrasonically induced in situ polymerization of PANI-SWCNT nanocomposites for electromagnetic shielding applications.
- Authors
Raju, P.; Rani, G. Neeraja; Kumar, S. Udaya; Joseph, Andrews; Raju, K. C. James
- Abstract
Electromagnetic interference (EMI) shielding has potential importance due to rapid growth in electronic technology. In recent days, carbon nanomaterials and conducting polymer nanocomposites grab much attention for EMI shielding applications. Nanocomposites of polyaniline (PANI) and single-walled carbon nanotubes (SWCNTs) were synthesized by ultrasonically induced in situ polymerization technique. The content of the SWCNT filler is varied as 1, 2, 3, 4 and 5 wt%. Fourier transform infrared spectroscopy was used to quantitatively analyse the functional groups of nanocomposites. Raman spectra revealed good compatibility between PANI and SWCNTs phases. The surface morphology of nanocomposites was analysed by field emission scanning electron microscope. The microwave absorption ability of the nanocomposites was estimated by determining shielding effectiveness in the range of 8.2–12.4 GHz (X-band). The total shielding effectiveness was found to increase with increase of SWCNT phase in PANI matrix and the maximum value of − 32.80 dB at 11 GHz with 99.999% absorption was obtained for 3 wt% of SWCNT sample. Dynamic mechanical properties were studied as a function of temperature. The complex permittivity and electrical conductivity of PANI-SWCNT nanocomposites are also studied. The complex permittivity (ɛ′ and ɛ″) and AC conductivity were found to be higher in PANI-SWCNTs nanocomposites as compared to the PANI. The increasing behaviour has been attributed to the good interaction between SWCNTs and PANI molecular chains. The present results reveal that the current sample materials are suitable for shielding the devices from EMI in X-band frequency region.
- Subjects
ELECTROMAGNETIC shielding; FIELD emission electron microscopes; POLYMERIC nanocomposites; NANOCOMPOSITE materials; FOURIER transform infrared spectroscopy; POLYMERIZATION
- Publication
Journal of Materials Science: Materials in Electronics, 2022, Vol 33, Issue 8, p5138
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-022-07702-2