Hybrid maghemite (γ-Fe2O3) nanoparticle/graphene nanosheet nanocomposite for terahertz-shielding applications

College

College of Science

Department/Unit

Physics

Document Type

Article

Source Title

Journal of Nanotechnology

Volume

2024

Issue

1

Publication Date

12-2024

Abstract

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 elec-tromagnetic sources. To date, there is a gap in current research regarding the conclusive use of maghemite nanoparticle (c−Fe 2 O3NP) as an efective nanofller for THz-shielding material while utilizing the inherent properties of graphene nanosheets (GNS) tocreate a hybrid polymer nanocomposite. Terefore, for the frst time, this study developed a novel hybrid c−Fe2 O 3/GNSnanocomposite while assessing the potential role of c−Fe2 O3 nanoparticles for THz-shielding applications. A one-step directchemical exfoliation method synthesized the GNS. On the other hand, a straightforward thermal decomposition methodsynthesized the c−Fe 2 O3 NP. Te nanomaterials were then loaded to poly (methyl methacrylate) (PMMA), with diferent ratios ofc−Fe 2 O3 NP (w% � 0, 5, 10, and 15) to fabricate thin flms by the evaporative casting technique. Te scanning electron microscopyresults with elemental dispersive X-ray (SEM-EDX) display the morphological traits of GNS as loosely stacked fat-shaped sheets.Te c−Fe 2 O3 has predominantly homogeneous spherical-shaped morphology measuring 30–60 nm. At the same time, the flmsretained some of the distinct features of the polymer matrix and GNS with localized clusters of the magnetic nanoparticles. Resultsfrom the X-ray difraction (XRD) analysis complemented the results of SEM and ATR-FTIR analysis, supporting the existence ofpure c−Fe 2 O3 NP. Furthermore, the time-domain spectroscopy (TDS) analyzes the THz electromagnetic interference-shieldingefectiveness (EMI-SE) at 0.6–1.6 THz of the nanocomposite with 15% of c−Fe 2 O3 , revealing an SE of ≤ 20 dB (99.00% waveattenuation) and calculated specifc shielding efectiveness (SSE) of ∼30 dB ∗ cm 3 /g. Tese demonstrated improved SE by in-troducing c−Fe 2 O3 NP as an additive magnetic fller. Conclusively, the fabricated hybrid c−Fe 2 O3 /GNS nanocomposites wereconsidered facile, efective, and comparable THz EMI-shielding materials

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Disciplines

Physics

Keywords

Nanostructured materials; Nanocomposites (Materials)

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