Hybrid Maghemite (γ-Fe2O3) Nanoparticle/Graphene Nanosheet Nanocomposite for Terahertz-Shielding Applications
Terahertz (THz)-integrated technology experienced explosive growth and shows excellent potential across many industries. Hence, developing shielding materials is crucial to safeguard waveguides and sensitive devices from unwanted external electromagnetic sources. To date, there is a gap in current r...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2024-01-01
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| Series: | Journal of Nanotechnology |
| Online Access: | http://dx.doi.org/10.1155/jnt/5528951 |
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| Summary: | Terahertz (THz)-integrated technology experienced explosive growth and shows excellent potential across many industries. Hence, developing shielding materials is crucial to safeguard waveguides and sensitive devices from unwanted external electromagnetic sources. To date, there is a gap in current research regarding the conclusive use of maghemite nanoparticle (γ−Fe2O3 NP) as an effective nanofiller for THz-shielding material while utilizing the inherent properties of graphene nanosheets (GNS) to create a hybrid polymer nanocomposite. Therefore, for the first time, this study developed a novel hybrid γ−Fe2O3/GNS nanocomposite while assessing the potential role of γ−Fe2O3 nanoparticles for THz-shielding applications. A one-step direct chemical exfoliation method synthesized the GNS. On the other hand, a straightforward thermal decomposition method synthesized the γ−Fe2O3 NP. The nanomaterials were then loaded to poly (methyl methacrylate) (PMMA), with different ratios of γ−Fe2O3 NP (w% = 0, 5, 10, and 15) to fabricate thin films by the evaporative casting technique. The scanning electron microscopy results with elemental dispersive X-ray (SEM-EDX) display the morphological traits of GNS as loosely stacked flat-shaped sheets. The γ−Fe2O3 has predominantly homogeneous spherical-shaped morphology measuring 30–60 nm. At the same time, the films retained some of the distinct features of the polymer matrix and GNS with localized clusters of the magnetic nanoparticles. Results from the X-ray diffraction (XRD) analysis complemented the results of SEM and ATR-FTIR analysis, supporting the existence of pure γ−Fe2O3 NP. Furthermore, the time-domain spectroscopy (TDS) analyzes the THz electromagnetic interference-shielding effectiveness (EMI-SE) at 0.6–1.6 THz of the nanocomposite with 15% of γ−Fe2O3, revealing an SE of ≤20 dB (99.00% wave attenuation) and calculated specific shielding effectiveness (SSE) of ∼30 dB∗cm3/g. These demonstrated improved SE by introducing γ−Fe2O3 NP as an additive magnetic filler. Conclusively, the fabricated hybrid γ−Fe2O3/GNS nanocomposites were considered facile, effective, and comparable THz EMI-shielding materials. |
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| ISSN: | 1687-9511 |