Microwave absorption properties of polyaniline (PAni) with various amount of carbonaceous material (CM)

Mokhtar, Nurrafiqah and Wong, Pei-Yi and Teh, Geok-Bee and Phang, Sook-Wai (2021) Microwave absorption properties of polyaniline (PAni) with various amount of carbonaceous material (CM). Polymer Bulletin, 78 (11). pp. 6351-6365. ISSN 0170-0839, DOI https://doi.org/10.1007/s00289-020-03432-9.

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This study investigates the microwave absorption properties of polyaniline (PAni) with varying carbonaceous material, CM (Fullerene,C-60) contents. PAni nanocomposites were prepared with varying contents of C-60 ranging from 5 to 40% through a chemical oxidation method by using carboxylic acid as the dopant. The functional groups of PAni nanocomposites were validated by Fourier Transform Infrared Spectroscopy (FTIR) and Ultraviolet-visible (UV-Vis) Spectroscopy analyses. The surface morphology of nanocomposites and the presence of titanium dioxide (TiO2) and C-60 were confirmed by Field Emission Scanning Electron Microscopy (FESEM) and X-ray Diffractometry (XRD), respectively. Microwave absorption studies were carried out using Microwave Vector Network Analyzer (MVNA) from 0.5 to 18.0 GHz. The study showed that PAni nanocomposites with 10% of C-60 formed the nanorods/nanotubes with the biggest diameter of 200 nm as compared to other PAni nanocomposites. It was found that PAni nanocomposites with 10% C-60 also recorded the highest electrical conductivity and relative permittivity of 1.708 x 10(-1) S/cm and 9.97, respectively. The nanocomposite that was formulated with 10% of C-60 showed an improvement of interchain and intrachain charge transfer as well as molecular polarization along the PAni backbone. Hence, it eventually reduces the electrical energy dissipated by PAni, and finally enhances the microwave absorption properties with the highest reflection loss (RL) of -61.3 dB at 9 GHz.

Item Type: Article
Funders: UMRG (RG294-14AFR), PPP Grant (PG145-2014B)
Uncontrolled Keywords: PAni nanocomposites; Carbonaceous material; Microwave absorption; Reflection loss
Subjects: Q Science > QD Chemistry
Divisions: Faculty of Science > Department of Chemistry
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 17 Mar 2022 07:46
Last Modified: 17 Mar 2022 07:46
URI: http://eprints.um.edu.my/id/eprint/26553

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