Abstract
Multiwall carbon nanotube (MWCNT) based nanocomposites were prepared by a two-step process. Firstly, tita- nium dioxide (TiO2) coated MWCNT was prepared via sol-gel technique. In the second step, the acid modified MWCNTs were dispersed in the thermoplastic polyurethane matrix by solution blending process. Characterizations of the nanocom- posites were done by X-ray diffraction analysis, X-ray photoelectron spectroscopy, Scanning Electron Microscopy, Transmis- sion Electron Microscopy and Energy-dispersive X-ray spectroscopy. Microwave absorption studies of the nanocomposites were carried out in X-band region. The microwave absorption result was discussed with the help of complex permittivity and permeability of the prepared radar absorbing material (RAM). The result showed superior microwave absorption prop- erty of the composite containing both TiO2 coated MWCNT and magnetite (Fe3O4). This result is due to the effective absorption of both electrical and magnetic components of the microwave. RAM-MW, RAM-Ti, RAM-Ti@MW and RAM- Ti@MW/Fe and showed the maximum reflection loss of -16.03 dB at 10.99 GHz, -8.4 dB at 12.4 GHz, -36.44 dB at 12.05 GHz and -42.53 dB at 10.98 GHz respectively. Incorporation of MWCNT enhanced the thermal stability of the com- posite which has been confirmed by thermogravimetric analysis.
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