Influence of Carbonaceous Nanofillers and Processing Methods on Electromagnetic Interference Shielding and Electrical Properties of Linear Low‐Density Polyethylene Nanocomposites

ABSTRACT The increasing integration and miniaturization of electronic systems have intensified concerns related to electromagnetic interference (EMI), creating a demand for lightweight and processable shielding materials. In this work, the EMI shielding and electrical properties of linear low‐density polyethylene (LLDPE) nanocomposites containing carbon nanotubes (CNTs), carbon nanofibers (CNFs), and reduced graphene oxide–carbon nanotube (rGO–CNT) nanofillers were systematically investigated. Nanocomposites were fabricated via melt and solution mixing to evaluate the effect of dispersion on conductive network formation, shielding effectiveness (SET), and volume resistivity. At 2 wt% filler loading, solution‐processed CNT/LLDPE and CNF/LLDPE nanocomposites achieved SET values of ~9 and ~9.5 dB, respectively, with volume resistivity on the order of 10 8 Ω cm, indicating improved conductive network formation. Notably, CNT‐based nanocomposites exhibit comparatively improved electrical conductivity due to their higher aspect ratio and ability to form more efficient conductive networks than CNFs. In contrast, melt‐processed composites exhibited higher resistivity and lower shielding performance due to filler agglomeration and discontinuous conductive pathways. The hybrid rGO–CNT system (1 wt% rGO + 1 wt% CNT) further reduced resistivity (~10 7 Ω cm) in solution‐processed samples, demonstrating enhanced conductive network formation. These results highlight the role of nanofiller selection and processing strategy in developing lightweight EMI shielding materials.