Construction of string-bead-like spatial conductive network derived from CoFe Prussian blue analogue and carbon nanotube composite for excellent electromagnetic wave absorption

Abstract

A research hotspot material, Prussian blue analogue (PBA), with low cost, easy synthesis, and MOFs structure, has attracted extensive attention in various fields recently. Especially, with the unique unit of metal nanoparticles embedded into the N-doped carbon shell, its derivative is regarded as a candidate in the electromagnetic (EM) absorption field. In this work, CoFe-CNT-PBA, synthesized by the coprecipitation method, was used as precursor to prepare string-bead-like spatial conductive network which is composited by carbon nanotubes (CNT) concatenating units of magnetic CoFe nanoparticles embedded into N-doped carbon shell. To a great extent, the environmental suitability of metal nanoparticles is improved. The result shows, SB-CoFe@C-CNT0.02-800 with microporous and mesoporous has a minimum reflection loss (RLmin) of −67.82 dB at 13.74 GHz with 2.20 mm, and the effective absorption bandwidth (EAB, RL ≤ −10 dB) is 7.23 GHz (10.77–18 GHz) at 2.07 mm. At last, MATLAB was used to simulate by building a double-layer absorber, and EAB dramatically reaches 8.35 GHz, which covers mostly the X band and the whole Ku band. The strategy, CNT concatenating porous micro-spheres derived from PBA, induces conduction loss and interface polarization loss, and provides novel and meaningful thinking for the construction of an excellent electromagnetic wave absorption composite.