A examine in Scientific Stories investigated the synthesis and characterization of a nanocomposite composed of FeNi₃-NiFe₂O₄-SiO₂ nanoparticles mixed with multi-wall carbon nanotubes (MWCNT). The analysis centered on evaluating the electromagnetic interference (EMI) shielding properties of the composite, aiming to develop a light-weight, high-performance materials for microwave expertise functions.
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Background
The growing prevalence of EMI in digital techniques has created a necessity for supplies that mix effectivity, low weight, and multifunctionality. Whereas efficient in some contexts, conventional shielding supplies typically fall quick in flexibility and flexibility. Latest developments in nanotechnology have enabled the mix of magnetic-ceramic supplies, comparable to FeNi₃-NiFe₂O₄-SiO₂ with conductive carbon-based parts like MWCNT.
FeNi₃-NiFe₂O₄-SiO₂ contributes sturdy electromagnetic wave absorption properties because of its magnetic traits, whereas MWCNT improves electrical conductivity and structural stability. This examine aimed to optimize the mixed properties of those supplies to create a composite with enhanced EMI shielding efficiency.
Methodology
FeNi₃-NiFe₂O₄-SiO₂ nanoparticles had been synthesized utilizing a coprecipitation course of. Nickel sulfate and iron sulfate had been dissolved, blended below magnetic stirring, and refluxed for uniformity. Sodium hydroxide was added to regulate the pH to 10, facilitating precipitation. Hydrazine hydrate served as a decreasing agent, and tetraethyl orthosilicate (TEOS) was used to advertise silica formation. The precipitate was washed and dried at 50 °C.
The synthesized nanoparticles had been mixed with MWCNT to kind the nanocomposite. Structural and morphological properties had been analyzed utilizing X-ray diffraction (XRD), subject emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM). Raman spectroscopy confirmed the presence of MWCNT. EMI shielding effectiveness was measured within the X and Ku frequency bands.
Outcomes and Dialogue
The FeNi₃-NiFe₂O₄-SiO₂ nanoparticles exhibited spherical morphologies with a mean diameter of 10 nm. FESEM photos confirmed that the nanoparticles adhered to the MWCNT sidewalls, forming clusters alongside the nanotube floor. Raman spectroscopy recognized the attribute D and G bands of MWCNT, that are indicative of its electrical properties.
The addition of MWCNT considerably elevated {the electrical} conductivity of the composite. This enhancement improved AC conduction and dielectric tangent loss, key parameters for EMI shielding. The nanocomposite demonstrated a shielding effectiveness of 25.29 dB at a thickness of three.5 mm, indicating efficient attenuation of electromagnetic waves. The shielding mechanism concerned each absorption and reflection, supported by the magnetic and conductive properties of the composite.
The ferromagnetic nature of FeNi₃-NiFe₂O₄-SiO₂ contributed to wave absorption, whereas the MWCNT improved floor and interfacial polarization. These mixed results enhanced the general shielding efficiency, making the fabric appropriate to be used in environments requiring efficient EMI mitigation, comparable to microwave expertise.
Conclusion
This examine efficiently synthesized and characterised a FeNi₃-NiFe₂O₄-SiO₂ nanocomposite with an EMI shielding effectiveness of 25.29 dB. The fabric’s properties end result from the synergistic interplay between the magnetic-ceramic nanoparticles and the conductive MWCNT. The composite is light-weight, practical, and efficient at attenuating electromagnetic waves, making it appropriate for technological functions in electronics and telecommunications. Future work might discover optimizing synthesis processes and broadening the fabric’s applicability in superior digital techniques.
Journal Reference
Dehghani-Dashtabi, M., Hekmatara, H. (2025). Structural, electrical and EMI shielding property of carbon nanotube embellished magnetic/ceramic nanoparticles. Scientific Stories. DOI: 10.1038/s41598-025-85378-4, https://www.nature.com/articles/s41598-025-85378-4
