Lightweight and textured Ni@Cu-encapsulated carbon tube with outstanding electromagnetic interference shielding performance

Fabrication of Ni-Encapsulated Carbon Tube/Poly(dimethylsiloxane) Composite Materials for Lightweight and Flexible Electromagnetic Interference Shielding Material

“…It is worth mentioning that the amorphous carbon acted as a support layer for the external Ni coating, providing sufficient mechanical strength for the subsequent processing of materials . To investigate the function of the amorphous carbon, Figure a shows the textile-based An cotton’s exterior surface via annealing at 300, 400, and 800 °C on applying 33.9 KPa pressure stress on its surface.…”

“…In addition, based on the reported EM wave theory, the EMI shielding efficiency of 300-An cotton was measured to determine their ability to shield electromagnetic waves through reflection and absorption mechanisms. Typically, we can calculate the SE T , SE R , and assimilation shielding (SE A ) ,, S E T = prefix− 10 0.25em lg ( P out P in ) = normalS normalE R + normalS normalE A + normalS normalE M normalS normalE T = normalS normalE R + normalS normalE A normalS normalE R = prefix− 10 0.25em lg ( 1 − R ) normalS normalE A = prefix− 10 0.25em lg ( T 1 − R ) As shown in Figure b, the samples have extraordinarily low SE R values (∼1.2 dB), which are higher than the majority of those that have been published. Particularly, the SE T value is decreased by about 28% (Figure b).…”

“…Furthermore, we calculated and analyzed the power coefficients of absorption ( A ), reflection ( R ), and transmission ( T ) (Figure d) ,, T = false| S 21 false| 2 R = false| S 11 false| 2 A = 1 − R − T Clearly, A (Figure c) and R (Figure e) values appear to barely change, while the T is enhanced by 200% (Figure d). More importantly, specific shielding efficiency (SSE), which is artificially prescribed as the density except SE, is typically utilized to assess the absolute effectiveness for lightweight shielding materials. ,, Because of the development of amorphous carbon tubes with a smaller density of mass, the average density of 300-An + PDMS cotton became 1.136 g/cm 3 , which is smaller compared with ECP-Ni + PDMS cotton one (Table ) on average. Similarly, SSE was calculated to be 27.5 dB·cm 3 /g as predicted, which is better than the one of ECP-Ni + PDMS cotton (Table ).…”

“…Both of the two techniques could enable more EM waves to enter the shielding materials instead of reflection with increasing EM absorption. [1][2][3]6,22 Up to the present, although research on and companies manufacturing the lower-reflection shielding (SE R ) materials have made considerable progress, the major shortcoming is the tension between performance and density. 6−9,12−16 In this study, a textured porous conductive material was fabricated by electroless nickel plating (ECP-Ni) and carbonization technology and used as EM shielding material (An cotton).…”

“…It should be noted that the core tier (vegetable fiber) could cling to the metal's inner surface under the condition of high temperatures after being carbonized. 1,36 Specifically, the internal vegetable fiber is transferred to an amorphous carbon tube with an Ni/carbon tube structure. The cotton with hollow characteristic makes it possible to successfully reduce the mass density.…”