Boron and nitrogen doped carbon nanotubes/Fe₃O₄ composite architectures with microwave absorption property

Boron and nitrogen doped carbon nanotubes/Fe₃O₄ (BNCNTs/Fe₃O₄) composite architectures have been prepared by pressure assisted precursor pyrolysis and gel soaking-curing methods. Nano-scale Fe₃O₄ particles with the diameter about 30 nm are uniformly distributed on the nanotubes which have the diameters about 300-400 nm and hundreds of microns in length. Microwave reflection loss of BNCNTs/Fe₃O₄ composite architectures was investigated in the frequency of 2-18 GHz. The microwave absorption property is depended on the soaking time. The composite architectures exhibit the minimum reflection loss at -51.2 dB (the corresponding frequency is 11.7 GHz at the soaking time of 120 min) suggesting the good microwave absorption properties.