Absorption-dominated electromagnetic interference (EMI) shielding materials are more attractive to manage the increasing electromagnetic radiation pollution than conventional reflection-dominated counterparts due to their advantages of balancing the efficient EMI shielding performance while minimizing the secondary pollution of the reflected electromagnetic (EM) wave. Herein, we first fabricate ferroferric oxide/carbon nanotubes/waterborne polyurethane (Fe3O4/CNTs/WPU) aerogels and then coat Ti3C2Tx MXene at the bottom to construct an asymmetric structure. Moreover, the medium or transition layer is formed during the coating process of MXene-ferroferric oxide by the gravity and aerogel's capillary action. This delicate design makes them with obvious absorption, transition, and reflection layers according to the progressive modular design principle. The composite aerogels show an average EMI shielding effectiveness (SE) of 20.06 dB, low reflectivity of 0.396, and specific EMI SE of SSE/t of 332.60 dB cm2 g–1 in the X-band when the MXene content is only 2.35 vol %. Additionally, the resultant aerogels exhibit remarkable flexible and mechanical properties, which could even bear weights of about 4500 times their own weight. In sum, this work provides a promising absorption-dominated EMI shielding candidate with flexible and high strength features.
The development of absorption-dominated electromagnetic interference shielding materials holds significant research potential, yet achieving an efficient electromagnetic shielding absorption capacity through simplified and convenient procedures remains a considerable challenge. Herein, a porous composite material prepared by poly(ethylene glycol) diacrylate (PEGDA) and pentaerythritol tetrakis(3-mercapto-propionate) (PETMP) by click chemistry is proposed, following with the loading of Ti3C2Tx MXene nanosheet/cellulose nanofiber (MXene/CNF) onto the surface of the composite materials by coating. In this study, the influence of sample thickness on the absorption and reflection properties is discussed. The hypothesis deductive method proves that the sample can be analyzed according to multiple transmission line models. Benefitting from the excellent electrical conductivity of MXene/CNF with the absorptive ability of PEG porous polymers and the Salisbury screen effect, this composite material achieves an ultrahigh electromagnetic shielding effectiveness (EMI SE) of 60 dB and an absorption coefficient (A) of 92% at 34 dB with the use of less than 0.3 wt % of conductive filler, which shows a prosperous application prospect in electromagnetic interference shielding field.
Absorption-dominated electromagnetic interference (EMI) shielding materials are more attractive to manage the increasing electromagnetic radiation pollution than conventional reflection-dominated counterparts, due to their advantages of balancing the efficient EMI shielding performance while minimizing the twice pollution of the reflected electromagnetic (EM) wave. Herein, we firstly fabricate ferroferric oxide/carbon nanotubes/waterborne polyurethane (Fe3O4/CNTs/WPU) aerogels and then coat Ti3C2Tx MXene at the bottom to construct asymmetric structure. Moreover, the medium or transition layer is formed during the coating process of MXene-ferroferric oxide by the gravity and aerogel’s capillary action. This delicate design makes them with obvious absorption, transition and reflection layers according to progressive modular design principle. The resultant composite aerogels show an average EMI SE of 20.06 dB, the low reflectivity of 0.396 and a specific EMI SE of SSE/t of 332.60 dB cm2 g-1 in the frequency range of 8.2-12.4 GHz. Additionally, the resultant aerogels exhibit remarkable flexible and mechanical properties, which even could bear weights of about 4500 times its own weight. In sum, this work provides a promising absorption-dominated EMI shielding candidate with flexible and high strength features.
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