Ultrabroad Microwave Absorption Ability and Infrared Stealth Property of Nano-Micro CuS@rGO Lightweight Aerogels

Nano-Micro Letters, Journal Year: 2022, Volume and Issue: 14(1)

Published: Aug. 20, 2022

Developing ultrabroad radar-infrared compatible stealth materials has turned into a research hotspot, which is still problem to be solved. Herein, the copper sulfide wrapped by reduced graphene oxide obtain three-dimensional (3D) porous network composite aerogels (CuS@rGO) were synthesized via thermal reduction ways (hydrothermal, ascorbic acid reduction) and freeze-drying strategy. It was discovered that phase components (rGO CuS phases) micro/nano structure (microporous nanosheet) well-modified modulating additive amounts of changing ways, resulted in variation pore structure, defects, complex permittivity, microwave absorption, radar cross section (RCS) value infrared (IR) emissivity. Notably, obtained CuS@rGO with single dielectric loss type can achieve an bandwidth 8.44 GHz at 2.8 mm low filler content 6 wt% hydrothermal method. Besides, aerogel realizes minimum reflection (RLmin) - 60.3 dB lower 2 wt%. The RCS reach 53.3 m2, effectively reduces probability target being detected detector. Furthermore, laminated architecture multicomponent endowed insulation IR versatility. Thus, this work offers facile method design develop rGO-based absorbers radar-IR stealth.

Language: Английский

---

Ultrathin Cellulose Nanofiber Assisted Ambient‐Pressure‐Dried, Ultralight, Mechanically Robust, Multifunctional MXene Aerogels

Advanced Materials, Journal Year: 2022, Volume and Issue: 35(1)

Published: Oct. 25, 2022

Ambient-pressure-dried (APD) preparation of transition metal carbide/nitrides (MXene) aerogels is highly desirable yet remains challenging. Here, ultrathin, high-strength-to-weight-ratio, renewable cellulose nanofibers (CNFs) are efficiently utilized to assist in the APD ultralight robust, conductive, large-area MXene-based via a facile, energy-efficient, eco-friendly, and scalable freezing-exchanging-drying approach. The strong interactions large-aspect-ratio CNF MXene as well biomimetic nacre-like microstructure induce high mechanical strength stability avoid structure collapse process. Abundant functional groups CNFs facilitate chemical crosslinking aerogels, significantly improving hydrophobicity, water resistance, even oxidation stability. 1D nature renders minimal MXenes' interlayered gaps numerous heterogeneous interfaces, yielding excellent conductivity electromagnetic interference (EMI) shielding performance aerogels. synergies MXene, CNF, abundant pores improve EMI performance, photothermal conversion, absorption viscous crude oil. This work shows great promises APD, multifunctional protection or compatibility, thermal therapy, oil-water separation applications.

Language: Английский

---

2D MXene Nanomaterials: Synthesis, Mechanism, and Multifunctional Applications in Microwave Absorption

Small Structures, Journal Year: 2022, Volume and Issue: 3(10)

Published: July 16, 2022

MXene nanomaterials stand out among 2D and have been extensively studied by researchers because of their unique layered structure, chemical diversity, outstanding physical properties. In recent years, materials rapidly opened the market for electromagnetic interference shielding technology due to excellent wave absorption (EMA) capability. However, so far, compared with development (EM) technology, there is still much room in construction MXenes application absorption. Herein, strategies, conversion mechanism, applications are reviewed. Through meticulous material design an interdisciplinary approach, expected become one smart tunable absorbers, scenarios will also broader.

Language: Английский

---

Recent progress on multifunctional electromagnetic interference shielding polymer composites

Journal of Material Science and Technology, Journal Year: 2022, Volume and Issue: 134, P. 106 - 131

Published: July 22, 2022

Language: Английский

---

3D Printed Integrated Gradient-Conductive MXene/CNT/Polyimide Aerogel Frames for Electromagnetic Interference Shielding with Ultra-Low Reflection

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

Published: Feb. 8, 2023

Construction of advanced electromagnetic interference (EMI) shielding materials with miniaturized, programmable structure and low reflection are promising but challenging. Herein, an integrated transition-metal carbides/carbon nanotube/polyimide (gradient-conductive MXene/CNT/PI, GCMCP) aerogel frame hierarchical porous gradient-conductivity has been constructed to achieve EMI ultra-low reflection. The gradient-conductive structures obtained by continuous 3D printing MXene/CNT/poly (amic acid) inks different CNT contents, where the slightly conductive top layer serves as EM absorption highly bottom layer. In addition, could extend dissipation path dissipate multiple reflections. Consequently, GCMCP frames exhibit excellent average efficiency (68.2 dB) (R = 0.23). Furthermore, miniaturized can be used gaskets effectively block wireless power transmission, which shows a prosperous application prospect in defense industry aerospace.

Language: Английский

---

Biomimetic Porous MXene Sediment-Based Hydrogel for High-Performance and Multifunctional Electromagnetic Interference Shielding

ACS Nano, Journal Year: 2022, Volume and Issue: 16(9), P. 15042 - 15052

Published: Aug. 19, 2022

Developing high-performance and functional hydrogels that mimic biological materials in nature is promising yet remains highly challenging. Through a facile, scalable unidirectional freezing followed by salting-out approach, type of composed "trashed" MXene sediment (MS) biomimetic pores manufactured. By integrating the honeycomb-like ordered porous structure, conductive MS, water, electromagnetic interference (EMI) shielding effectiveness up to 90 dB X band can reach more than 40 ultrabroadband gigahertz (8.2–40 GHz) for flexible hydrogel, outperforming previously reported EMI shields. Moreover, thanks stable framework MS-based influences water on performance are quantitatively identified. Furthermore, extremely low content silver nanowire embedded into hydrogels, leading significantly improved multiple reflection-induced microwave loss thus performance. Last, allow sensitive reliable detection human motions smart coding. This work not only achieves control via interior structure but also demonstrates waste-free, low-cost, strategy prepare multifunctional, hydrogels.

Language: Английский

---

Bicontinuous, High-Strength, and Multifunctional Chemical-Cross-Linked MXene/Superaligned Carbon Nanotube Film

ACS Nano, Journal Year: 2022, Volume and Issue: 16(11), P. 19293 - 19304

Published: Oct. 19, 2022

Lightweight, thin, large-area, and ultraflexible chemical-cross-linked MXene/superaligned carbon nanotube composite films with a bicontinuous structure are manufactured. The exhibit high mechanical strength, good electrical conductivity, hydrophobicity, oxidation stability, as well wearable multifunctionalities involving electromagnetic interference (EMI) shielding, electrothermal conversion, photothermal antibacterial performance. An X-band EMI shielding effectiveness (SE) of 24 to 70 dB at the thickness 8 28 μm an SE more than 60 in ultrabroadband frequency range 8.2-40 GHz accomplished. A surface specific 122 368 dB·cm2·g-1 is achieved, significantly outperforming other typical shields reported. electro-/photothermal performance leads high-efficiency deicing Combined efficient scalable manufacturing approach, multifunctional show great potential for applications devices, defense, antibacterials, Internet Things.

Language: Английский

---

Graphene Oxide‐Assisted Multiple Cross‐Linking of MXene for Large‐Area, High‐Strength, Oxidation‐Resistant, and Multifunctional Films

Advanced Functional Materials, Journal Year: 2022, Volume and Issue: 33(11)

Published: Dec. 30, 2022

Abstract Transition metal carbides/nitrides (MXenes) with metallic electrical conductivity and excellent processability attract increasing attention for assembling multifunctional macrostructures. However, the challenges, involving poor mechanical strength, inferior oxidation stability, limited scalable manufacturing, impede their wide applications. Herein, large‐area, high‐strength, ultra‐flexible hybrid films are developed through multiple physical chemical cross‐linking of MXene/cellulose facilitated by graphene oxide. The MXene‐based manifest significantly improved hydrophobicity, water/solvent resistance, meanwhile, maintain electromagnetic interference shielding performance. X‐band surface‐specific effectiveness (SE) 18,837.5 dB cm 2 g −1 an SE over 60 in ultra‐broadband frequency range achieved, comparable to best shields ever reported. Furthermore, wearable demonstrate photothermal antibacterial electrothermal deicing Thus, such high‐performance a facile manufacturing method have substantial application prospects flexible electronics, thermotherapy, compatibility, aerospace.

Language: Английский

---

Multi-interface Assembled N-Doped MXene/HCFG/AgNW Films for Wearable Electromagnetic Shielding Devices with Multimodal Energy Conversion and Healthcare Monitoring Performances

ACS Nano, Journal Year: 2022, Volume and Issue: 16(5), P. 7816 - 7833

Published: May 10, 2022

With the progressive requirements of modern electronics, outstanding electromagnetic interference (EMI) shielding materials are extensively desirable to protect intelligent electronic equipment against EMI radiation under various conditions, while integrating functional applications. So far, it remains a great challenge effectively construct thin films with diversiform frameworks as integrated devices. To simultaneously promote waves (EMWs) attenuation and multifunction, an alternating-layered deposition strategy is designed fabricate polydimethylsiloxane packaged N-doped MXene (Ti3CNTx)/graphene oxide wrapped hollow carbon fiber/silver nanowire (p-LMHA) followed by annealing encapsulation approaches. Contributed synergistic effect consecutively conductive networks porous architectures, LMHA exhibit satisfying effectiveness 73.2 dB at thickness 11 μm, specific 31 150.1 dB·cm2·g-1. Benefiting from encapsulation, p-LMHA further impart hydrophobicity reliability harsh environments. Besides, devices integrate rapid-response behavior electro/photothermal and, meanwhile, function healthcare monitoring sensor. Therefore, believed that assembled independent offer facile solution for practical multimodular protection integration characteristics.

Language: Английский

---

Functional Tailoring of Multi‐Dimensional Pure MXene Nanostructures for Significantly Accelerated Electromagnetic Wave Absorption

Small, Journal Year: 2023, Volume and Issue: 19(41)

Published: June 8, 2023

Transition metal carbide (Ti3 C2 Tx MXene), with a large specific surface area and abundant functional groups, is promising candidate in the family of electromagnetic wave (EMW) absorption. However, high conductivity MXene limits its EMW absorption ability, so it remains challenge to obtain outstanding attenuation ability pure MXene. Herein, by integrating HF etching, KOH shearing, high-temperature molten salt strategies, layered (L-MXene), network-like nanoribbons (N-MXene NRs), porous monolayer (P-MXene ML), layer L) are rationally constructed favorable microstructures states for HF, KOH, KCl/LiCl used functionalize tune microstructure state (F- , OH- Cl- terminals), thereby improving capacity MXene-based nanostructures. Impressively, unique structure, proper electrical conductivity, area, defects, nanostructures achieve good impedance matching, dipole polarization, conduction loss, thus inheriting excellent performance. Consequently, L-MXene, N-MXene NRs, P-MXene ML, L enable reflection loss (RL ) value -43.14, -63.01, -60.45, -56.50 dB matching thickness 0.95, 1.51, 3.83, 4.65 mm, respectively.

Language: Английский

---