With the development of electronic technology, flexible electromagnetic wave shielding materials have attracted considerable interests in various fields. However, multifunctional electromagnetic wave shielding materials with great flexibility, excellent efficiency, environmental-friendliness, and corrosion resistance are urgently needed to be investigated. Although several works have achieved such frameworks, the extremely complicated fabrication procedure largely restricts their broad application. Accordingly, we deliver a facile strategy to achieve flexible polypyrrole nanotube–polyethylene glycol–polyvinyl alcohol hydrogel (PPPg) for enhanced electromagnetic shielding behaviors. The shielding effectiveness of the prepared hybrid with a thickness of 2 mm can reach 21 dB from 8 to 12 GHz. Additionally, such a film provides excellent flexibility with an elastic deformation of 100.9% at 2.28 MPa. H-plasma processing further leads to the hydrophobic feature of the PPPg hydrogel, promoting its great corrosion resistance in the natural environment. Our hydrogel is expected to become a promising multifunctional flexible nanocomposite hydrogel for high-performance wearable devices.
Carbon nanoframeworks have received considerable attention in electromagnetic wave absorption (EWA), benefiting from their low mass density, cost effectiveness, environmental friendliness, and strong mechanical strength. Although various works have been performed to achieve carbon nanostructures with favorable electromagnetic behavior, the mechanism behind the application is still ambiguous, typically the effect of amorphous and graphitic components on the EWA performances. Accordingly, we modulate carbon nanotubes with a controllable amorphous–graphitic ratio based on a facile carbonization strategy. With the increased processing temperature, CNTs show increased graphitic formation simultaneously with the removal of amorphous carbon. Meanwhile, the N-containing groups are also converted from defective N toward graphitic N. The optimum performance is achieved with a strong reflection loss (−61.25 dB) and broad bandwidth (6.24 GHz) at 700 °C. Simulation is further applied to demonstrate the effects of CNTs with different amorphous–graphitic ratios. Such work elucidates the impact mechanism of amorphous and graphitic carbon on the electromagnetic behavior, resulting in the scalable application of carbon materials.
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