Abstract
The aim of this study was enhanced the absorption of electromagnetic waves by nanocomposite containing polyaniline (PANI), functionalized multi wall carbon nanotubes (MWCNTs) in the presence of magnetic Ba0.2Sr0.2La0.6MnO3 nanoparticles (NPs). At First MWCNTs was functionalized by 3:1 ratio of sulfuric and nitric acid, then functionalized MWCNTs was coated by NPs with the traditional sol-gel method. In the final step, MWCNTs/NPs covered by PANI with an in situ polymerization in an aqueous solution. FESEM, XRD, vibrating sample magnetometer (VSM), FTIR analysis was confirmed NPs synthesis in appropriate size and shape and functionalized MWCNTs was coated with NPs and PANI synthesized by correct chemical formula covered all of them, too. The maximum reflection loss of the Ba0.2Sr0.2La0.6MnO3 NPs and MWCNT/Ba0.2Sr0.2La0.6MnO3 were about -12.04dB at 14.82 GHz and -22.36 dB at 14.78GHz with a bandwidth of 2.67GHz (more than –10dB). The conclusion indicated we could good microwave shielding in KU-band (12-18 GHz) by these nanocomposites. Key words: Multiwall carbon nanotube, microwave absorption, magnetic nanoparticles, polyaniline.
Highlights
The study of microwave absorption in 8 to 18 GHz has received much attention in recent years
multi wall carbon nanotubes (MWCNTs)/Ba0.2Sr0.2La0.6MnO3/PANI is evaluated in Figure 1 at several steps of synthesis
In Ba0.2Sr0.2La0.6MnO3/MWCNT spectrum is as shown in Figure 1b, absorption peak at 603.84 cm-1 was related to metal oxides rocking vibrations such as
Summary
The study of microwave absorption in 8 to 18 GHz has received much attention in recent years. The crystal structure of the magnetic nanoparticles according to their constituent elements and magnetic properties of nanoparticles is effective in electromagnetic interfering (EMI) and electromagnetic wave absorber. Magnetic nanoparticles are produced in various ways such as chemical co-precipitation (Hosseini and Zamani, 2016a), sol-gel combustion (Amiri, 2019), hydrothermal synthesis (Gomez et al, 2019), solid state (Ban et al, 2018) and spray pyrolysis (Minin et al, 2018).
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