Speakers
Description
The perpetual expansion of wireless technologies, 5G and smart electronic devices has intensified electromagnetic interference (EMI) pollution, increasing the demand for efficient, lightweight and flexible shielding materials. In this study, thin PMMA-based nanocomposites reinforced with hybrid graphene/multi-walled carbon nanotube (G-CNT) structures were developed and evaluated for absorption-dominant EMI shielding. The G-CNT filler was subjected to electron-beam irradiation at doses of 50, 100, 200, and 400 kGy, followed by solution casting with dimethylformamide (DMF) as solvent. Composite thickness and filler loading were systematically varied. The nanocomposites were characterized by SEM, TEM, FTIR-ATR, TGA/DSC, and four-point electrical conductivity measurements. EMI shielding performance was evaluated in the S-band using S11 and S21 scattering parameters measured with a vector network analyzer and waveguide configuration. All investigated composites exhibited predominantly absorption-based shielding, with the absorption component accounting for 82–87% of total shielding effectiveness, while the multiple-reflection contribution remained negligible. The highest performance was obtained for the 20 wt.% G-CNT composite with a thickness of 0.48 mm and an irradiation dose of 50 kGy, reaching a maximum total shielding effectiveness of 12.64 dB and an average value of 10.85 dB. Increasing filler loading and thickness enhanced shielding effectiveness through improved conductive network formation and increased absorption paths, whereas excessive irradiation at 400 kGy slightly reduced performance due to defect formation. A quadratic Response Surface Methodology model successfully described parameter interactions and provided a predictive framework for composite optimization. These findings demonstrate the potential of irradiated G-CNT/PMMA nanocomposites as lightweight, low-reflection materials for advanced electronics applications.
| Conference Topics | Nanomaterials and Nanotechnology |
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