Off/on switchable smart electromagnetic interference shielding aerogel

•Smart EMI shielding material is prepared based on lamellar carbon aerogel•Aerogel shows large reversible compressibility and strain-sensitive conductivity•Aerogel switches from electromagnetic wave transmission to by compression•The off/on function switch compressing decompressing aerogel Electromagnetic interference (EMI) materials are important for preventing EM radiation pollution that may interfere with electronic device operation, cause information leakage, threaten human health. Compared conventional fixed performance, smart dynamically tunable performance according specific application requirements real-time environmental changes more desirable in future. Here, we have an switchable aerogel, which can realize functional conversion between through compression decompression. This study provides a unique model the dynamic switching of response, has potential construct multifunctional response systems. Smart characteristics attractive future devices. report be tuned vice versa mechanical filling conductive nanoparticles into wood-derived showing conductivity. The original good impedance matching low dielectric loss, allowing pass through. Mechanical enables establish highly pathways significantly increases conductivity thus activates its performance. repeatedly aerogel. availability such never-before-realized opportunity development advanced Wireless communication technology long-distance plays role our daily life, but it also produces serious (EM) interferes operation devices, causes threatens Therefore, rational use control waves while hot topic practical significance.1Shahzad F. Alhabeb M. Hatter C.B. Anasori B. Man Hong S. Koo C.M. Gogotsi Y. 2D transition metal carbides (MXenes).Science. 2016; 353: 1137-1140Crossref PubMed Scopus (2384) Google Scholar, 2Yan D.X. Pang H. Li Vajtai R. Xu L. Ren P.G. Wang J.H. Z.M. 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Moreover, interaction electric dipoles minimized reduce signal polarization loss.23Liu Bi Liang She Che [email protected]2@TiO2 protected]@TiO2 microspheres wideband absorption.Adv. 28: 486-490Crossref (1073) contrast, sufficiently imperative on-state provide wave. best knowledge, none existing meet above requirements. design preparation remains big challenge. stress-driven carbonaceous aerogels. Specifically, natural wood was used raw prepare amorphous structure, followed layers. exhibited excellent compressibility, elasticity, When compressive interlayer spacing within filled particles attached upper lower layers made contacts form channels, leading considerable increase sharply ?1.5 ?25.5 dB, achieving off state) state). states offers platform As one abundant resources earth, wood, inherently hierarchical vertically aligned microchannels, Figure 1A schematically illustrates process wood. 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Meanwhile up 150 ?m, facilitates channels (X direction) capillary force. quickly NPs bottom top, shown 1H Video S1. torn uniform black outside inside, demonstrating homogeneous S4). Further SEM observation confirmed even distribution each layer 1F). worth mentioning acidification essential their Otherwise, pristine readily accumulated prevented further S5). After freeze-drying annealing treatment, wood/XC-72 converted carbon/XC-72 NP denoted WXC aerogel) 54 lightweight rest green bristlegrass without deforming fine bristles. withstand high-temperature carbonization, absorbed remain uniformly dispersed 1G S6). 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Compressing Electrical (?) determines materials.30Zeng M.J. Zhou L.C. Lightweight MWCNT/WPU ultrahigh 303-310Crossref (490) Due properties S10). higher than those Y Z directions. Uncompressed example, ?0.16 m?1 direction. considerably compression. 2E, 25% 75%, ?0.4 ?17.3 m?1. exhibits visually constructing simple circuit power light-emitting diode (LED) 2F). LED became brighter darker released. dependence explained microstructure during uncompressed ?150 ?m 2H 2I). Thus, cannot contact layer, state. Under compression, become relatively straight largely 2G, 2J, 2K, S11). result, number thereby improving For comparison, measured variation (XC-72 free). Z-directional close (0.11 versus 0.16 m?1). maximum only 3.82 absence newly established S12), much smaller same tested scattering parameters strains vector network analyzer. propagation (along direction), field Figures 3A 3B total (SET(Y)) (SEA(Y)) sensitivity strain. quite SET(Y) ?1.4 means incident penetrates “off-state” rather ensuring transmission.20Lv upon reaches boosts ?27.6 exceeding standard requirement (>20 dB) commercial applications,5Zhou Scholar,31Han Shuck C.E. Rakhmanov Parchment Friedman G. Beyond Ti3C2Tx: MXenes 5008-5016Crossref (198) corresponds “on state” shielding. 3C). performances decay cycles. simulated FEKO software. simulation 3D, (10 GHz) (18 × 18 cm), back plotted, strength displayed map 3E). 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Zheng Z.J. voltage-boosting enabling low-frequency, device.Adv. 1706343Crossref (519) ?? upsurge convert heat induced current. particular, ?? value, S13).40Kaiser Compatibility Handbook. CRC Press, 2004Google changed placement waveguide frame 90°. 0% SET(X) 2.1 29.0 S16). slight weakened ascribed caused addition responsible filler switching. confirm this, samples, i.e., sheets, nanotubes (CNTs), respectively (denoted WG WCNT compared SET(Y). Because (4.12 direction, strain), (?8) (?49), weaker ability. ?13 failing 4D). sheets filler, they aggregated blocked lateral size S17). rendered obtained poor suitable S18). Although CNTs similar S19 S20), satisfactory S21). because, loading (20 mg), ?3.0 twice WXC, ?50% penetrate penetration could aspect space enhance (SET(Y) ? 1.4 dB), weak ability, e.g., 16 4 mg. comparison demonstrates zero-dimensional Meanwhile, carefully controlled. contents 5 10 reduces state S22). summary, realizes first spring-like space. During contact, rapidly respond repeated decompression regulated