Synthesis and evaluation of microwave absorption properties of Fe 3 O 4 /Halloysite/polypyrrole nanocomposites

[摘要] The Fe 3 O 4 nanoparticles and Fe 3 O 4 /Halloysite nanotubes (HNTs) were synthesised by the co-precipitation method and Fe 3 O 4 /HNTs/polypyrrole (PPy) nanocomposites were synthesised by in situ polymerisation of pyrrole monomers on the surface of the Fe 3 O 4 /HNTs. The scanning electron microscopy images showed the uniform structure of nanocomposites. The Fourier transform infrared spectra revealed the characteristic peaks of Halloysite and PPy. The Fe 3 O 4 /HNTs/PPy nanocomposite exhibits a saturated magnetisation of 6.7 emu/g. The microwave absorption properties of Fe 3 O 4 /HNTs/PPy nanocomposites were investigated in the 8–12 GHz (X-band) range. The value of the minimum reflection loss was obtained − 26.2 dB at 11 GHz for the 3 mm thickness nanocomposite. The results showed the absorbing bandwidth below − 10 dB was broadened to 2.3 GHz.

[学科分类] 计算机科学（综合）

[关键词] scanning electron microscopy;precipitation (physical chemistry);filled polymers;nanoparticles;polymerisation;nanomagnetics;nanocomposites;nanotubes;nanofabrication;iron compounds;Fourier transform infrared spectra;saturation magnetisation;microwave absorption;nanoparticles;microwave absorption;Fe3O4-halloysite-polypyrrole nanocomposites;halloysite nanotubes;co-precipitation method;polymerisation;pyrrole monomers;scanning electron microscopy;Fourier transform infrared spectra;saturated magnetisation;reflection loss;frequency 11.0 GHz;Fe3O4