Microwave absorption properties of rare metal-doped multi-walled carbon nanotube/polyvinyl chloride composites

Using rare metal nitrate-doped multi-walled carbon nanotubes as the absorber and polyvinyl chloride as the matrix, the microwave electromagnetic and absorbing properties of multi-walled carbon nanotube/polyvinyl chloride composites were studied. The complex permittivity of the composites doped with different rare metal nitrate decreased in the frequency region of 8.2-12.4GHz. The minimum reflection loss of rare metal nitrate-doped multi-walled carbon nanotube/polyvinyl chloride composites decreased and shifted slightly to the higher frequency region, and the absorption bandwidth (<-10dB or >90%) increased in the frequency range of 8-18GHz compared to multi-walled carbon nanotube/polyvinyl chloride composites. The reflection loss (<-10dB) of 0.2wt% La(NO3)3-doped multi-walled carbon nanotube/polyvinyl chloride composites is the widest from the absorption bandwidth (maximum is 5.12GHz).