Flexible, lightweight carbon nanotube sponges and composites for high-performance electromagnetic interference shielding

Ultrathin flexible graphene films with high thermal conductivity and excellent EMI shielding performance using large-sized graphene oxide flakes

“…5d). 1,4,5,11,13,19,20,28,31,32,[35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51] This nding is noteworthy because the LG-4 lm would satisfy several commercial requirements for an EMI shielding material, for example ultrahigh EMI SE (73.7 dB), low density (2.05 g cm À3 ), ultrathin thickness (0.014 mm), anti-corrosion, high exibility and easy fabrication.…”

“…Electromagnetic interference (EMI) shielding protection is the most effective way to prevent EM pollution. [4][5][6][7] According to electromagnetic theory, the main mechanisms to reduce undesirable EM emissions include reection of EM radiation by impedance mismatching and absorption of the EM wave energies by dielectric or magnetic loss. 8 Electrically conductive materials are reective shielding materials, which could reect most of the incident waves, due to their high electrical conductivity.…”

“…4,[11][12][13] For instance, the carbon nanotube (CNT) sponge with a thickness of 1.8 mm shows a high EMI shielding effectiveness (SE) of 54.8 dB and specic SE (SSE) of 5480 dB cm 3 g À1 in X band. 5 By adding conductive polymer and magnetic loss materials, the graphene/CNT lm with a thickness of 0.6 mm can achieve EMI SE as high as 133.22 dB. 14 However, in some cases like foldable and exible electronic devices, the thickness of the shielding lms is highly restricted.…”

Highly conductive PP/PET polymer blends with high electromagnetic interference shielding performances in the presence of thermally reduced graphene nanosheets prepared through melt compounding

“…The third term, SE M , is a positive or negative correction term induced by the reflecting waves inside the shielding barrier (multiple reflections), requiring the presence of a large surface area or interface area in the shield. When SE A ≥ 10 dB, it is usually assumed that SE M is negligible and, thus : …”

Lightweight Electromagnetic Interference Shielding Materials and Their Mechanisms

“…[32]. 13 Lightweight Electromagnetic Interference Shielding Materials and Their Mechanisms DOI: http://dx.doi.org /10.5772/intechopen.82270 Lu et al [33] synthesized a flexible CNTs sponge with a density of 10.0 mg/cm 3 via chemical vapor deposition (CVD) process, composed of self-assembled and interconnected CNT skeletons. The freestanding CNTs sponge showed the high EMI SE and SSE of 54.8 dB and 5480 dB cm 3 /g in X-band, respectively.…”