Structure evolution of Prussian blue analogues to CoFe@C core–shell nanocomposites with good microwave absorbing performances

Abstract

Novel uniform CoFe@C core–shell composite nanoparticles with good distribution have been fabricated through the combined self-assembly and controlled thermal decomposition of Co-based Prussian blue (PB) nanocubes..

The Fabrication and High-Efficiency Electromagnetic Wave Absorption Performance of CoFe/C Core–Shell Structured Nanocomposites

“…The coercivity is larger while the value of saturation magnetization is smaller than that of bulk FeCo alloys [ 46 ]. However, it is comparable with other reported CoFe or CoFe@C composites [ 32 , 33 , 47 ]. Some slight differences may be ascribed to the Co/Fe proportion, coating of carbon layer and grain size.…”

“…Zhang et al synthesized FeCo@C nanoflakes and found that the orientation could decrease the absorber thickness and increase the absorption performance [ 32 ]. Zeng et al reported that CoFe@C core–shell nanocomposites synthesized by a template-engaged approach exhibited microwave absorption performance with an effective absorption bandwidth of 4.3 GHz [ 33 ]. However, developing a facile method to fabricate metallic magnetic materials/carbon composites with a well-defined core–shell structure including the high yield and uniformity remains a big challenge.…”

Template‐Free Formation of Uniform Fe3O4 Hollow Nanoflowers Supported on Reduced Graphene Oxide and Their Excellent Microwave Absorption Performances

“…The MHF‐6rGO with surface area of 114 m 2 g −1 exhibit abundant mesopores (Figure e), in agreement with the TEM image as displayed below. The hysteresis loops (Figure f) show the superparamagnetic character of the samples with negligible coercivities, which can bring a good magnetic loss . The M s values of Fe 3 O 4 decrease after adding the GO due to the nanoscale size effect of the Fe 3 O 4 nanoparticles and the existence of rGO …”

Development of a hollow carbon sphere absorber displaying the multiple-reflection effect to attenuate electromagnetic waves

“…19 These carbon composites showed good electromagnetic absorption properties. However, since amorphous carbon is generally combined with metal oxides or metals, it is difficult to have its integral density satisfy the requirements of commercial applications, especially in aircras and missiles.…”