Pore-Rich Cellulose-Derived Carbon Fiber@Graphene Core-Shell Composites for Electromagnetic Interference Shielding

Abstract

Because of serious electromagnetic pollution caused by the widespread use of radio frequency equipment, the study of electromagnetic interference (EMI) shielding materials has been a long-standing topic. Carbon fiber and graphene composites have great potential as EMI shielding materials due to their unique microstructure and electrical conductivity. In this work, a novel kind of core-shell composite is fabricated based on the pore-rich pine needles-derived carbon fibers (coded as PNCFs) core and the graphene shell. The pore-rich PNCFs are created by KOH activation, and the integration between the pore-rich PNCFs and the graphene relies on a plasma-enhanced chemical vapor deposition (PECVD) method. The conductivity of the pore-rich PNCFs@graphene core-shell composite reaches 4.97 S cm−1, and the composite has an excellent EMI shielding effectiveness (SE > 70 dB over X-band (8.2–12.4 GHz)) and achieves a maximum value of ~77 dB at 10.4 GHz, which is higher than many biobased EMI shielding materials in the recent literature. By calculation and comparison, the large absorption loss (accounting for 90.8% of total loss) contributes to reducing secondary radiation, which is quite beneficial for stealth uses. Thus, this work demonstrates a promising design method for the preparation of green high-performance composites for EMI shielding and stealth applications (such as warcrafts, missiles, and stealth wears).

Development of Electromagnetic-Wave-Shielding Polyvinylidene Fluoride–Ti3C2Tx MXene–Carbon Nanotube Composites by Improving Impedance Matching and Conductivity

“…The electric conductivity of copper is 5.8 × 10 5 S cm −1 [ 55 ]; ε 0 is 8.854 × 10 −12 F m −1 [ 56 ]. The magnetic permeability is minuscule and close to zero ( Figure S5 ), and the relative permeability of the nonmagnetic material is close to one [ 57 ].…”

Effect of Carbon Fiber Paper with Thickness Gradient on Electromagnetic Shielding Performance of X-Band

“…Liang conducted tests on corrugated carbon fiber surface felt to achieve enhanced electromagnetic shielding performance, thereby showcasing the promising application potential of carbon-based materials in the realm of electromagnetic shielding. The paper-based carbon fiber flexible material [ 17 , 19 , 20 ], prepared through the process of paper-making using chopped carbon fibers, exhibits distinctive advantages in terms of lightweight, thinness, and wearability as electromagnetic shielding materials. In previous studies [ 21 ], we employed wet paper-making technology to fabricate cost-effective and high-performance electromagnetic shielding paper.…”

Adaptable bio-based dynamically cross-linked networks via disrupting physical cross-linking and chain entanglement for electromagnetic interference shielding materials

“…Excessive percolation threshold (CPC) means that more conductive llers are doped, which has a negative impact on other properties of the composite and affects practical applications. Excessive doping of conductive llers also increased the electromagnetic radiation re ectivity and caused secondary pollution [37,38]. Designing conductive composite materials with isolation structures is one of the effective methods to reduce CPC and improve EMI shielding effectiveness [39].…”