Excellent microwave absorption properties by tuned electromagnetic parameters in polyaniline-coated Ba_0.9La_0.1Fe_11.9Ni_0.1O₁₉/reduced graphene oxide nanocomposites

Abstract

Ba 0.9 La 0.1 Fe 11.9 Ni 0.1 O 19 nanoparticles were prepared by a co-precipitation method, and Ba 0.9 La 0.1 Fe 11.9 Ni 0.1 O 19 /reduced graphene oxide/polyaniline ternary nanocomposites (BF/RGO/PANI) were prepared by in situ polymerization. Microwave reflection loss, and the permittivity and permeability of BF/RGO/PANI nanocomposites were investigated in the frequency range 2-18 GHz. The prepared samples possessed excellent electromagnetic wave-absorbing performances, and the optimal impedance matching of BF/RGO/PANI nanocomposites was found. The minimum reflection loss reached À49.1 dB near the frequency of 14.08 GHz with a thickness of 1.9 mm and its absorption bandwidth with a reflection loss below À10 dB ranged from 12.4-16.72 GHz with a bandwidth of 4.32 GHz. Our study illustrates that the as-prepared BF/RGO/PANI nanocomposites are promising candidates for use in electromagnetic wave-absorbing materials.

Remarkable microwave absorption efficiency of low loading ratio of Ni0.25Co0.25Ti0.5Fe2O4/SrCoTiFe10O19/Cu composite coated with polyprrole within polyurethane matrix

“…Also the hysteresis loop loss is negligible when a conductive material and a nonmagnetic material are incorporated so the magnetic loss in this case is mainly due to the eddy current or natural resonance. When eddy current is the only cause of magnetic loss, the eddy current coefficient C 0 is almost constant [1,2,12]. C 0 can be calculated using equation (4)…”

“…Therefore, the magnetic loss is due to the natural resonance in the range from 8 to 10 GHz. At higher frequencies from 10 to 12 GHz, C 0 becomes almost constant and eddy current is the main cause of magnetic loss [1,2].…”

“…This electronic equipment suffers from electromagnetic interference and cannot work properly under microwave exposure [1]. Also microwaves produced by widespread radar, mobile connecting points and mobile phones affect human health and cause different types of cancers [2]. Therefore, it is important to find solutions to protect human body heath and shield electrical circuits from microwaves.…”

“…Combining the properties of these two types of ferrites may result in better absorption. However, ferrites have high density and narrow absorption band which render the use of ferrite ineffective especially when broad band absorption and light microwave absorbers are needed [1,2]. Many studies reveal the synergistic effect of incorporating magnetic loss material with dielectric loss material [4].…”

Effectiveness of PANI/Cu/TiO2ternary nanocomposite on antibacterial and antistatic behaviors in polyurethane coatings

“…Among different kinds of electrically conductive polymers, polyaniline (PANI) is certainly one of the most important electrically conductive polymers which is because of its unparalleled characteristics like facile synthesis chemistry, low production expense, reversible redox behavior, environmental stability, and electromagnetic and electrochemical properties. 17,18 Due to these unique properties, it could be utilized in various fields such as corrosion protection, drug delivery, waste water treatment, supercapacitors, and antistatic coatings. [19][20][21][22][23] Nanocomposite materials could combine the merits of different materials to exhibit improved and synergetic behavior.…”