Novel Straw-Derived Carbon Materials for Electromagnetic Interference Shielding: A Waste-to-Wealth and Sustainable Initiative

Abstract

Biomass resources are growing in concern in electromagnetic interference (EMI) shielding due to the advantages of low-cost, sustainability, and unique structural feature. From the perspective of “waste to wealth” and sustainable development, novel straw-derived hollow porous carbon-tube arrays (SCAs) have been fabricated through direct carbonization of wheat straw followed by orderly assembly for the first time. The resultant SCAs with increased SC diameter of ∼1.7–3.3 mm showed not only low apparent density of ∼72–33 mg/cm3 due to the presence of arrayed hollow macrostructure, but also high EMI SE of ∼57.7–44.0 dB coming from both the strong EM reflection and conductive dissipation, as well as hierarchical internal multiple reflections. After the further construction of ultralight graphene aerogel (GA) in their hollow interior, the GA/SCAs with slightly increased density of only ∼78–39 mg/cm3 exhibited obvious SE enhancement of ∼66.1–70.6 dB compared to those of neat SCAs. In addition, the performance comparison between our SCAs and other previously reported carbon foams also revealed the more advanced configuration of hollow porous carbon-tube array for lightweight and high-performance EMI shielding application.

Lightweight, Flexible Cellulose-Derived Carbon Aerogel@Reduced Graphene Oxide/PDMS Composites with Outstanding EMI Shielding Performances and Excellent Thermal Conductivities

“…The results showed that the EMI SE T of ALC/PDMS EMI shielding composites reached 51 dB with the thickness of 10 mm. Ma et al [ 25 ] obtained straw-derived carbon (SC) aerogel by carbonizing wheat straw at 1500 °C and then prepared SC/epoxy EMI shielding composites by backfilling with epoxy resin. The results showed that the EMI SE T of SC/epoxy EMI shielding composites reached 58 dB with the thickness of 3.3 mm.…”

Ultra-light MXene aerogel/wood-derived porous carbon composites with wall-like “mortar/brick” structures for electromagnetic interference shielding

“…However, most carbon-based porous materials are internally crosslinked by weak hydrogen bonds and have poor mechanical properties. Crosslinking through strong chemical bonds generally uses a variety of chemicals, and often produces a large amount of waste liquid, which is very unfriendly to the environment [24].…”

Flexible and Conductive Cellulose Composite Paper for Highly Efficient Electromagnetic Interference Shielding

“…With the rapid development of highly integrated electronic communications technology and personal electronic equipment, especially for the gradual application of fifth generation wireless system and the proposal of sixth generation of wireless system, electromagnetic interference (EMI) pollution has become a serious pollution, which inevitably disturbs the normal operation of adjacent electronic devices and imposes adverse impacts on human health. [ 1–5 ] Hence, extensive efforts are being made to fabricate EMI shielding materials that effectively address these negative influences. Traditionally, metal‐based composites with high electrical conductivity were widely used to mitigate the transmission of electromagnetic waves (EMW) efficiently, but limited by their disadvantages, such as easy‐corrosion, poor flexibility, manufacturing challenges and serious secondary EMI pollution.…”