Absorption-dominated electromagnetic interference shielding composite foam based on porous and bi-conductive network structures

Abstract

With the rapid development of electronic equipment and communication technology, it is urgent to develop composites with absorption-dominated and high electromagnetic interference shielding effectiveness (EMI SE) to prevent secondary...

Flexible CNT-MXene-CNT Film with Low Surface Conductance for High- and Low-Power Electromagnetic Absorption Protection

“…The skeleton vibration of the MXene sheet and the characteristic vibration of −OH account for the typical absorption bands at 2870.6 and 3308.5 cm –1 , while the peaks at 1609.1 and 1439.2 cm –1 correspond to the stretching vibration of CO and the characteristic vibration of the C–O epoxy group, testifying to the successful grafting of −COOH on the MXene sample . Furthermore, four element peaks of C, O, Ti, and Si displayed in the XPS spectra (Figure d) of the CNT-MXene-CNT sample showed the same composition as the original MVSR, which proves the successful preparation of the constructed composite structure. , …”

“…44 Furthermore, four element peaks of C, O, Ti, and Si displayed in the XPS spectra (Figure 2d) of the CNT-MXene-CNT sample showed the same composition as the original MVSR, which proves the successful preparation of the constructed composite structure. 45,46 Since the MVSR sample was no longer transparent after modification, the macromorphology of the relevant samples was recorded, and the results are shown in Figure 3 so as to show the dispersion effect of group-modified CNT and MXene in the modified silicone rubber more clearly.…”

Construction of Three-Dimensional Network Hierarchy Structure Based on Melamine Foam for Electromagnetic Shielding

“…The polymer foams such as melamine foams (MF) have been applied in the field of electromagnetic shielding due to their inherent 3D porous continuous structure and a high opening rate over 99%. The low-cost foams were utilized as the template for the deposition of conductive fillers on the skeleton to manufacture efficient electromagnetic shielding materials by facile processes. − For example, the melamine foam (MF) was integrated with graphene, , carbon nanotubes, − and metallic nanoparticles , to fabricate a 3D conductive network with high electricity. When the electromagnetic waves strike the foam skeletons deposited with conductive fillers, a number of electromagnetic waves enter the interior of the foams, then forming reflection and scattering at the skeletons to realize microwave absorption.…”

Incorporating Loss Factor Modular Design for Full Ku-Band Microwave Attenuation in Double-Layered Graphene Aerogels

“…Consequently, reflected waves generated by these materials may give rise to secondary pollution, thereby undermining the efficacy of EMI shielding as a comprehensive solution for mitigating and managing EM pollution. 9,10 To address this limitation, the most effective method for preventing EM pollution involves the use of absorption-dominated EMI shielding. 11,12 This approach significantly diminishes or entirely eliminates EM radiation through energy conversion or destructive interference, offering a more robust and superior means of reducing the detrimental effects of EM pollution.…”

“…The widespread adoption of electronic components and communication equipment, driven by the rapid growth of digital information technology, has resulted in significant electromagnetic (EM) pollution. , This pollution can adversely affect the proper functioning of electronic devices such as medical equipment, computers, and mobile phones while posing a risk to human health, as well. , In response to these concerns, electromagnetic interference (EMI) shielding has emerged as an effective means of mitigating the issue through two primary mechanisms: (1) reflection and (2) absorption. , By employing highly conductive materials, reflection-dominated EMI shielding functions as a fundamental barrier against the transmission of EM radiation. , Nevertheless, the majority of existing EMI shielding materials through reflection are incapable of entirely attenuating or reducing the energy of EM radiation. Consequently, reflected waves generated by these materials may give rise to secondary pollution, thereby undermining the efficacy of EMI shielding as a comprehensive solution for mitigating and managing EM pollution. , To address this limitation, the most effective method for preventing EM pollution involves the use of absorption-dominated EMI shielding. , This approach significantly diminishes or entirely eliminates EM radiation through energy conversion or destructive interference, offering a more robust and superior means of reducing the detrimental effects of EM pollution. , …”