The magnetic properties of the metal nanoparticles (NPs) can play remarkable role in electromagnetic interference shielding (EMI Shielding) of many defence and commercial electronic devices. In the present work, coconut oil and PVA capped magnetic cobalt/cobalt oxide nanoparticles (Co/Co3O4
NPs) were synthesized by chemical reduction method and impregnated in polymer matrix to verify their EMI shielding behaviour. The coconut oil capped Co/Co3O4 NPs with presence of hcp and fcc phases were prepared in the size domain of 7–10 nm and the effect of surfactant
(the oil) on size and oxidation state was studied by varying the ratios. The shielding efficiencies of Co/Co3O4 NPs PVA nanocomposites were analysed by using vector network analyser (VNA) in X- and Ku-band ranging from 8 GHz–18 GHz. The VNA results showed
increased shielding efficiency with increasing concentration of NPs.
Iron complexed with dimethylacetamide (DMAc) was incorporated in variable ultra low concentration in polyimide (PI) at it precursor stage to obtain nanoscopically manipulated metallopolyimide films. The in situ generation of these nanophase structures, their stability within PI matrix, and interaction with its chains was studied using UV-vis spectroscopy. AFM topographic image shows the presence of rock-shaped nano particles, which is produced by the formation of polyamic acid salt of Fe-DMAc complex. Unique fluorescence and improved hydrolytic stability of these metallopolyimide films were due to the formation of nanophase structures. Different photo-physical properties of developed films are attributed to size quantization effect. POLYM. ENG. SCI.,
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