Title:Investigation of Electromagnetic Wave Absorption Properties of Ni-Co
and MWCNT Nanocomposites
Volume: 18
Issue: 4
Author(s): Majid Ebrahimzadeh*, Abdolrasoul Gharaati, Alireza Jangjoo and Hamed Rezazadeh
Affiliation:
- Department of Physics, Payame Noor University, Tehran, P.O. Box 19395-3697 Iran
- Department of Physics, Nourabad
Mamasani Branch, Islamic Azad University, Nourabad Mamasani, Iran
Keywords:
Microwave absorber, electromagnetic waves, multiwall carbon nanotube, nickel, cobalt, absorption properties.
Abstract:
Background: In recent years, severe electromagnetic interference among electronic devices
has been caused by the unprecedented growth of communication systems. Therefore, microwave absorbing
materials are required to relieve these problems by absorbing the unwanted microwave. In the
design of microwave absorbers, magnetic nanomaterials have to be used as fine particles dispersed in
an insulating matrix. Besides the intrinsic properties of these materials, the structure and morphology
are also crucial to the microwave absorption performance of the composite. In this study, Ni-Co-
MWCNT composites were synthesized, and the changes in electric permittivity, magnetic permeability,
and reflectance loss of the samples were evaluated at frequencies of 2 to 18 GHz.
Methods: Nickel-Cobalt-Multi Wall Carbon Nanotubes (MWCNT) composites were successfully synthesized
by the co-precipitation chemical method. The structural, morphological, and magnetic properties
of the samples were characterized and investigated by X-ray diffractometer (XRD), Scanning Electron
Microscopy (SEM), Transmission Electron Microscopy (TEM), Vibrating Sample Magnetometer
(VSM), and Vector Network Analyzer (VNA).
Results: The results revealed that the Ni-Co-MWCNT composite has the highest electromagnetic wave
absorption rate with a reflectance loss of -70.22 dB at a frequency of 10.12 GHz with a thickness of 1.8
mm. The adequate absorption bandwidth (RL <-10 dB) was 6.9 GHz at the high-frequency region, exhibiting
excellent microwave absorbing properties as a good microwave absorber patent.
Conclusion: Based on this study, it can be argued that the Ni-Co-MWCNT composite can be a good
candidate for making light absorbers of radar waves at frequencies 2- 18 GHz.