Tuned MWCNT/CuO/Fe3O4/Polyaniline nanocomposites with exceptional microwave attenuation and a broad frequency band

Abstract

In this study, novel quaternary MWCNT/CuO/Fe3O4/PANI nanocomposites were synthesized with three different weight ratios of CuO/Fe3O4/PANI to MWCNT (1:3), (1:4), and (1:5), where all of its components were synthesized separately and then combined in specific weight ratios. CuO/Fe3O4/PANI transmission electron microscopy (TEM) images revealed that most nanoparticles were in a CuO/Fe3O4 hybrid form, with a narrow size distribution uniformly dispersed in a polymer background. The TEM and scanning electron microscopy (SEM) images of the MWCNT/CuO/Fe3O4/PANI nanocomposite revealed that the MWCNT was uniformly coated with CuO/Fe3O4/PANI. All three nanocomposites samples demonstrated superior microwave attenuation performance in terms of reflection loss and absorption bandwidth. The minimum reflection losses for MWCNT/CuO/Fe3O4/PANI nanocomposites (1:3), (1:4), and (1:5) were 45.7, 58.7, and 85.4, 87.4 dB, respectively. The absorption bandwidths (RL ≤ −10 dB) of MWCNT/CuO/Fe3O4/PANI nanocomposites (1:3), (1:4), and (1:5) were 6, 7.6, and 6 GHz, respectively.

Reduced Graphene Oxide/Barium Ferrite Ceramic Nanocomposite Synergism for High EMI Wave Absorption

“… 80 , 81 A high attenuation value demonstrates a synergistic enhancement of dielectric and magnetic energy loss, leading to a more effective absorption of the wave by the ceramic nanocomposite. 82 Additionally, the effective absorption percentage, denoted as A eff , is a metric used to assess the efficiency of an EMI shielding material in absorbing EMI. It represents the fraction of incident EMI power that is absorbed by the material and is expressed as a percentage by applying the following formula 83 …”

“…The 25 wt % TCRGO/BF and TCRGO/MAG ceramic nanocomposites exhibit improved microwave absorption performance due to the effective dissipation of electromagnetic waves that enter the interiors of these absorbers, with the 25 wt % TCRGO/BF showing particularly advantageous performance, surpassing other samples. , A high attenuation value demonstrates a synergistic enhancement of dielectric and magnetic energy loss, leading to a more effective absorption of the wave by the ceramic nanocomposite . Additionally, the effective absorption percentage, denoted as A eff , is a metric used to assess the efficiency of an EMI shielding material in absorbing EMI.…”

UV‐Curable 3D‐Printable Microwave‐Absorbing Material with a Sword‐Sheath Structure Based on Multiwalled Carbon Nanotube/Polypyrrole Nanotube/Fe3O4 Composites

“…In particular, the exploration of materials exhibiting strong absorption, broadband capabilities, light weight, thin thickness, and versatility attracts considerable research attention for the development of next‐generation stealth‐absorbing materials. [ 8–11 ]…”

“…In particular, the exploration of materials exhibiting strong absorption, broadband capabilities, light weight, thin thickness, and versatility attracts considerable research attention for the development of next-generation stealth-absorbing materials. [8][9][10][11] Owing to their unique features including high flexibility, excellent corrosion resistance, low cost, and good processing performance, polymer-based microwaveabsorbing materials meet the requirements for devices in aerospace, electronic communication, and other fields, especially in the field of microwave-absorbing materials. [12][13][14][15] Polymer-based microwaveabsorbing materials are mainly divided into two types: intrinsic conductive polymer microwave-absorbing materials and filled polymer microwave-absorbing materials.…”