Multifunctional MXene/C Aerogels for Enhanced Microwave Absorption and Thermal Insulation

Nano-Micro Letters, Journal Year: 2023, Volume and Issue: 15(1)

Published: Aug. 9, 2023

Two-dimensional transition metal carbides and nitrides (MXene) have emerged as promising candidates for microwave absorption (MA) materials. However, they also some drawbacks, such poor impedance matching, high self-stacking tendency, density. To tackle these challenges, MXene nanosheets were incorporated into polyacrylonitrile (PAN) nanofibers subsequently assembled a three-dimensional (3D) network structure through PAN carbonization, yielding MXene/C aerogels. The 3D effectively extends the path of microcurrent transmission, leading to enhanced conductive loss electromagnetic (EM) waves. Moreover, aerogel's rich pore significantly improves matching while reducing density MXene-based absorbers. EM parameter analysis shows that aerogels exhibit minimum reflection (RLmin) value - 53.02 dB (f = 4.44 GHz, t 3.8 mm), an effective bandwidth (EAB) 5.3 GHz (t 2.4 mm, 7.44-12.72 GHz). Radar cross-sectional (RCS) simulations employed assess radar stealth effect aerogels, revealing maximum RCS reduction perfect electric conductor covered by aerogel reaches 12.02 m2. In addition MA performance, demonstrates good thermal insulation 5-mm-thick can generate temperature gradient over 30 °C at 82 °C. This study provides feasible design approach creating lightweight, efficient, multifunctional

Language: Английский

---

Design and advanced manufacturing of electromagnetic interference shielding materials

Materials Today, Journal Year: 2023, Volume and Issue: 66, P. 245 - 272

Published: April 10, 2023

Electromagnetic interference (EMI) shielding is critical in electronic applications. However, the currently available EMI materials are restricted customizability and application flexibility. Recent advances manufacturing technologies have provided a unique path to achieve custom creation of solutions. A successful example additive (AM), which has enabled high design freedom, efficient performance regulation, multifunctionality simultaneously into fabricated shields, offering an opportunity start revolution field shielding. In this review, we summarize latest AM materials, aiming provide deep understanding connection between raw methods, considerations, performances shields. We first introduce mechanism subsequently focusing on characteristics representative methods as-created Based requirements create application-oriented solutions, these also critically compared. Thereafter, present state-of-the-art considerations shields examine pivotal roles realizing designs. conclude by discussing future research directions, at motivating use developments

Language: Английский

---

MOF-derived Ni-Co bimetal/porous carbon composites as electromagnetic wave absorber

Advanced Composites and Hybrid Materials, Journal Year: 2022, Volume and Issue: 6(1)

Published: Dec. 29, 2022

Language: Английский

---

Advancements in Microwave Absorption Motivated by Interdisciplinary Research

Advanced Materials, Journal Year: 2023, Volume and Issue: 36(4)

Published: Oct. 23, 2023

Abstract Microwave absorption materials (MAMs) are originally developed for military purposes, but have since evolved into versatile with promising applications in modern technologies, including household use. Despite significant progress bench‐side research over the past decade, MAMs remain limited their scope and yet to be widely adopted. This review explores history of from first‐generation coatings second‐generation functional absorbers, identifies bottlenecks hindering maturation. It also presents potential solutions such as exploring broader spatial scales, advanced characterization, introducing liquid media, utilizing novel toolbox (machine learning, ML), proximity lab end‐user. Additionally, it meticulously compelling medicine, mechanics, energy, optics, sensing, which go beyond efficiency, along current development status prospects. interdisciplinary direction differs previous primarily focused on meeting traditional requirements (i.e., thin, lightweight, wide, strong), can defined next generation smart absorbers. Ultimately, effective utilization ubiquitous electromagnetic (EM) waves, aided by third‐generation MAMs, should better aligned future expectations.

Language: Английский

---

Boosting Interfacial Polarization Through Heterointerface Engineering in MXene/Graphene Intercalated-Based Microspheres for Electromagnetic Wave Absorption

Nano-Micro Letters, Journal Year: 2023, Volume and Issue: 15(1)

Published: June 7, 2023

Multi-layer 2D material assemblies provide a great number of interfaces beneficial for electromagnetic wave absorption. However, avoiding agglomeration and achieving layer-by-layer ordered intercalation remain challenging. Here, 3D reduced graphene oxide (rGO)/MXene/TiO2/Fe2C lightweight porous microspheres with periodical intercalated structures pronounced interfacial effects were constructed by spray-freeze-drying microwave irradiation based on the Maxwell-Wagner effect. Such approach reinforced via defects introduction, skeleton, multi-layer assembly multi-component system, leading to synergistic loss mechanisms. The abundant 2D/2D/0D/0D heterojunctions in high density polarization charges while generating sites, resulting boosted polarization, which is verified CST Microwave Studio simulations. By precisely tuning nanosheets heterostructures, both impedance matching improve significantly. At low filler loading 5 wt%, rate exceeds 70%, minimum reflection (RLmin) -67.4 dB can be achieved. Moreover, radar cross-section simulations further confirm attenuation ability optimized microspheres. These results not only novel insights into understanding enhancing effects, but also constitute an attractive platform implementing heterointerface engineering customized hierarchical architectures.

Language: Английский

---

Sequential Architecture Induced Strange Dielectric‐Magnetic Behaviors in Ferromagnetic Microwave Absorber

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(27)

Published: March 27, 2023

Abstract The high filler loading (FL) is a bottleneck in developing lightweight ferromagnetic microwave absorbers (MAs) for the actual applications. Sequential architecture design of MAs can induce strange physical behaviors due to unique coupling‐enhancement effect between functional units, providing vast potential achieving absorption performance. However, FLs current sequential fail be designed on demand because dielectric‐magnetic cannot fulfilled. influence engineering macroscopic properties or microscopic loss mechanism still needs more exploration. Herein, based four mesoscopic models (particles, chains, bundles, and fibers) series with different architectures are prepared via bottom‐up self‐assembly method. fibrous samples exhibit best performance (−51.3 dB, 4.12 GHz) at breakthrough FL 2 wt%, which one order magnitude less than other MAs. Strange behaviors, including negative permittivity heterodromous chiral vortex, occur units lateral configurations. Further, special established reveal attenuation evolutionary mechanism. This study clarifies relationship provides new sight understand electromagnetic

Language: Английский

---

Ultrasonic Field Induces Better Crystallinity and Abundant Defects at Grain Boundaries to Develop CuS Electromagnetic Wave Absorber

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(49)

Published: Aug. 11, 2023

Ultrasonic field (USF) is widely used to regulate the intrinsic properties of materials that are not applied in electromagnetic wave (EMW) absorption. One reason lack a response mechanism for USF hinders expansion their EMW absorption performance. Therefore, address this issue, series CuS nanoparticles with diverse anions constructed presence or absence USF. The ultrasonic-induced cavitation effect can significantly promote crystallization and lead accumulation S defects at grain boundaries (GBs). Furthermore, GBs easily oriented arranged, allowing polarization relaxation retention be maintained 10 wt%. Consequently, nitrate precursor under shows an optimum effective bandwidth (EAB) 10.24 GHz thickness 3.5 mm, which 228.6% more than without chloride also achieves EAB 3.92 GHz, even considerably low filler ratio. Thus, study demonstrates first time provides novel technique optimize performance semiconductors.

Language: Английский

---

1D/2D CoTe2@MoS2 composites constructed by CoTe2 nanorods and MoS2 nanosheets for efficient electromagnetic wave absorption

Nano Research, Journal Year: 2023, Volume and Issue: 16(7), P. 10698 - 10706

Published: June 13, 2023

Language: Английский

---

High-temperature multispectral stealth metastructure from the microwave-infrared compatible design

Composites Part B Engineering, Journal Year: 2023, Volume and Issue: 259, P. 110737 - 110737

Published: April 14, 2023

Language: Английский

---

Ordered Heterostructured Aerogel with Broadband Electromagnetic Wave Absorption Based on Mesoscopic Magnetic Superposition Enhancement

Advanced Science, Journal Year: 2023, Volume and Issue: 10(21)

Published: May 7, 2023

Demand for lightweight and efficient electromagnetic wave (EW) absorbers continues to increase with technological advances in highly integrated electronics military applications. Although MXene-based EW have been extensively developed, more coupling thinner thickness are still essential. Recently, ordered heterogeneous materials emerged as a novel design concept address the bottleneck faced by current material development. Herein, an heterostructured engineering assemble Ti3 CNTx MXenes/Aramid nanofibers/FeCo@SiO2 nanobundles (FS) aerogel (AMFS-O) is proposed, where commonly disordered magnetic composition transformed FS arrays that provide powerful loss capacity. Experiments simulations reveal anisotropy networks enhance response field vector of EW, which effectively improves impedance matching makes reflection (RL) peaks shift lower frequencies, leading thickness. Furthermore, temperature stability excellent compressibility AMFS-O expand functionalized The synthesized achieves full-wave absorption X Ku-band (8.2-18.0 GHz) at 3.0 mm RLmin -41 dB low density 0.008 g cm-3 . These results suggest effective strategy designing high-performance multifunctional absorbers.

Language: Английский

---