Abstract
Strontium ferrite nanoparticles were prepared by a coprecipitation method, and reduced graphene oxide/strontium ferrite/polyaniline (R-GO/SF/PANI) ternary nanocomposites were prepared by in situ polymerization method. The morphology, structure, and magnetic properties of the ternary nanocomposites were investigated by X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), TEM, Raman, and VSM. The microwave-absorbing properties of the composites were measured by a vector network analyzer. The XRD patterns show the single phase of strontium hexaferrite without other intermediate phases. TEM photographs reveal that strontium ferrite nanoparticles are uniformly dispersed on the surfaces of R-GO sheets. The R-GO/SF/PANI nanocomposite exhibited the best absorption property with the optimum matching thickness of 1.5 mm in the frequency of 2–18 GHz. The value of the maximum RL was −45.00 dB at 16.08 GHz with the 5.48-GHz bandwidth. The excellent absorption properties of R-GO/SF/PANI nanocomposites indicated their great potential as microwave-absorbing materials.
Highlights
In recent years, the rapid growth of electronic equipment has put humans in increasing contact with each other, but it results in serious electromagnetic pollution in civil and military applications, which is known as electromagnetic interference (EMI)
Ferrite absorbers [3,4,5], ferroelectric materials [6, 7], conductive polymers [8,9,10], and composite materials [11, 12] have been researched, but the traditional microwave-absorbing materials cannot meet all of the requirements such as strong absorption, wide range of absorption frequency, thin thickness, and light weight at the same time [13]
Yuan and coworkers synthesized polyaniline (PANI)/SrFe12O19 composites by in situ polymerization, and their results indicated that the conductivity of PANI on SrFe12O19 dramatically affected the microwave properties [20]
Summary
The rapid growth of electronic equipment has put humans in increasing contact with each other, but it results in serious electromagnetic pollution in civil and military applications, which is known as electromagnetic interference (EMI). To solve the EMI problem, the development of microwave-absorbing materials with strong absorption over a broad frequency range is required urgently. Saini and coworkers reported a composite of polyanilinecoated M-Ba-ferrite powders, the composite obtained improving microwave absorption properties due to the interaction and interfacial polarization between polyaniline and M-Ba-ferrite [19]. Yuan and coworkers synthesized polyaniline (PANI)/SrFe12O19 composites by in situ polymerization, and their results indicated that the conductivity of PANI on SrFe12O19 dramatically affected the microwave properties [20]. The dispersion of magnetic particle in the composites is a bottleneck problem These drawbacks of the composites restrict their application in the microwave absorption field. As the thinnest and most lightweight material in the carbon world, reduced graphene oxide (R-GO), which has extremely a high specific surface area and unique two-dimensional structure, may be the best candidate of electromagnetic wave-absorbing materials
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