From materials to components: 3D-printed architected honeycombs toward high-performance and tunable electromagnetic interference shielding

Multi-layered composites using polyurethane-based foams and 3D-printed structures to curb electromagnetic pollution

“…The article thus contains a plot of SE T values representing the existing literature on such structures. The SE T value obtained in our work is comparable to the existing literature 43 and has even outperformed in specific configurations. Apart from the excellent EMI shielding performance reported in our work, this study also gives a comparative overview of different design configurations and shielding mechanism, which can help future researchers to choose the shield based on their needs (required shielding performance, thickness of shield, cost, and filler content that can be incorporated).…”

“…This might lead to additional issues such as processing difficulties and poor mechanical properties. In a recent article by Chen et al, 43 they fabricated 3D printed composite structures and compared them with the existing literature on foam-based composites and composite sheets. The article thus contains a plot of SE T values representing the existing literature on such structures.…”

“…The pore size range in foam and 3D printed structures is thus kept less than l/7.5 (obtained under certain assumptions) as well as l/5 as suggested in the existing works of literature. 32,43 The SEM of PU-CNT foam and PU-CNT 3Dprint is shown in Fig. S5 (ESI †).…”

“…[33][34][35][36][37][38][39][40][41] 3D printing of polymers for EMI shielding applications is a relatively newer area but has been growing for a couple of years. [30][31][32][42][43][44][45][46][47] In a recent work by Ning Chen et al, 43 they fabricated 3D printed mesh structure (honeycomb geometry) using conducting filament (made up of CNT/graphene nanosheets/PLA). They concluded that a pore size less than 1/5th of incident wavelength (l/5) is recommended for a lightweight shield with desirable EMI shielding performance.…”

Recent advances in 3D printed structures for electromagnetic wave absorbing and shielding

“…And thus, it is feasible to apply metastructures in numerous fields such as antenna technologies, radar, EMI shielding materials, and electromagnetic wave absorption materials. The honeycomb structure 107,[111][112][113][114][115][116][117][118] is always an ideal choice to be designed as both an EMI shielding structure and electromagnetic wave absorber due to its excellent structural properties that facilitate the reflection of electromagnetic waves. The lattice structure 119,120 provides sufficient conditions for reducing the dielectric constant and improving the impedance matching performance due to internal abundant air gaps.…”