Microwave absorption properties of polyaniline (PAni) with various amount of carbonaceous material (CM)
Document Type
Article
Publication Date
10-1-2021
Abstract
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.
Keywords
PAni nanocomposites, Carbonaceous material, Microwave absorption, Reflection loss
Divisions
CHEMISTRY
Funders
UMRG (RG294-14AFR),PPP Grant (PG145-2014B)
Publication Title
Polymer Bulletin
Volume
78
Issue
11
Publisher
Springer Verlag (Germany)
Publisher Location
ONE NEW YORK PLAZA, SUITE 4600, NEW YORK, NY, UNITED STATES