Nature Communications
·
2024
·Vol. 15
·期 1
·1-8
·
IF 14.7
Xie Wenke,Tang Qian,Xie Jinlong,Fei Yang,Wan Hujie,Zhao Tao,Ding Tianpeng,Xiao Xu,Wen Qiye
The fast-growing terahertz technologies require high-performance terahertz absorber for suppressing electromagnetic interference. Since the dissipation mechanism in terahertz band usually focuses on electronic conduction loss, almost all terahertz absorbers are constructed with electronically conducting materials being opaque, which limits their applications in scenarios requiring high visible transmittance. Here, we demonstrate a transparent terahertz absorber based on permittivity-gradient elastomer-encapsulated-organohydrogel. Our organohydrogel-based terahertz absorber exhibits a high absorbing property (average reflection loss of 49.03 dB) in 0.5–4.5 THz band with a thin thickness of 700 μm and a high average visible transmittance of 85.51%. The terahertz absorbing mechanism mainly derives from the ionic conduction loss of the polar liquid in organohydrogel. Besides, the hydrophobic and adhesive elastomer coating endows this terahertz absorber high absorbing stability and interfacial adhesivity. This work paves a viable way to designing transparent terahertz absorbers.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Xi Lin,Chenchen Wang,Chaoqun Zhang,Qi Guo,Chuanshuang Hu,Yi Yang,Yonghui Zhou,Xiuyi Lin,Weiwei Zhang,Jiangtao Xu
The high carrier mobility of conductive polymers/polypyrrole (PPy) exhibits an inherent antagonism with the dielectric polarization loss required for microwave absorption materials. The excessively continuous electron transport in traditional PPy conductive networks leads to dominant electromagnetic wave reflection, rendering effective absorption challenging. The design of microstructures to reconstruct electron transport pathways in PPy while maintaining moderate conductivity and introducing controlled defects and polarization centers remains a significant challenge in achieving the functional transition from conductive loss to dielectric loss. This study addresses this by precisely constructing heterointerfaces through in-situ confined polymerization, achieving molecular coupling between bacterial nanocellulose (BNC) and PPy. This approach transcends the limitation of traditional conductive polymers with single shielding functions, enabling intelligent conversion of PPy-based materials from electromagnetic shielding to microwave absorption. By designing an asymmetric gradient structure, the composites achieve a minimum reflection loss (RL min ) of −53 dB at a thickness of 4 mm and an effective absorption bandwidth (EAB) covering the entire X-band (8.2–12.4 GHz) at 3.57 mm, a synergistic regulation paradigm of structure-composition-dielectric properties is established. Meanwhile, the fabricated aerogel maintains robust microwave absorption performance under acidic, alkaline, and high-temperature conditions, demonstrating exceptional environmental stability. This work provides a viable and sustainable strategy for developing green electromagnetic absorption materials, offering insights into balancing conductivity and polarization loss in conductive polymer systems to achieve efficient microwave dissipation.
研究领域:
材料科学
·
高分子科学
·
电磁学
·
纳米技术
·
微波工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2025
·
IF 3.9
Lu Yao,Tian Yu,Hong Bo,Xu Jingcai,Peng Xiaoling,Li Jing,Chen Hongwei,Qiu Shi,Zhang Nan,Wang Xinqing
Interface polarization and conduction loss constitutes a crucial loss mechanism in electromagnetic wave absorption (EWA) materials, the dissipation capacity could be enhanced by regulating the electrical conductivity and heterogeneous interfaces of EWA composites. In this work, the hollow CoFe 2 O 4 microspheres are fabricated using the hydrothermal method and are subsequently compounded with polyaniline (PANI) through mechanical mixing to synthesize hollow CoFe 2 O 4 @PANI (H-CFP) composites. By adjusting the PANI content and thereby altering the interfaces of CoFe 2 O 4 and PANI, the impact on the microstructures and EWA performance is systematically analyzed for the H-CFP composites. All results indicate that the CoFe 2 O 4 microspheres are well-dispersed on PANI and greatly affect the EWA performance of the H-CFP composites. The optimized H-CFP-4 displays the outstanding EWA capacity with a minimum reflection loss (RL min ) of − 43.60 dB and an effective absorption bandwidth (EAB) of 1.71 GHz at 5.5 mm. Additionally, the superior performance of the H-CFP composites in the domain of radar stealth is further verified through CST simulation. The excellent EWA behavior is attributed to the interface polarization, conduction loss and impedance matching due to the synergistic effect of conductive PANI and magnetic CoFe 2 O 4 microspheres. This study offers a novel concept for designing high-performance EWA materials suitable for complex electromagnetic environments and possesses broad application prospects.
研究领域:
材料科学
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电磁学
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纳米技术
·
应用物理学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 32
·期 39
·2206053
·
IF 19.924
Zhi Zhang,Ziming Xiong,Yao Yao,Derong Wang,Zhiqian Yang,Pin Zhang,Qing Zhao,Wenke Zhou
Electronic devices have brought huge convenience to daily lives; however, a large amount of electromagnetic radiation pollution is generated. Therefore, an urgent demand for electromagnetic wave absorbing materials featuring “low thickness, wide frequency band and strong absorption” is put forward. Here, a strategy of introducing a conductive carbon nanotubes (CNTs) network into CH 3 NH 3 PbI 3 (MAPbI 3 ) is developed to construct an electromagnetic wave absorbing system. As the absorption center, MAPbI 3 dominates the absorption band via an electric polarization process. Meanwhile, the CNTs construct an efficient conductive network, which supply a transmission path for free electrons inside the MAPbI 3 crystals and enhance conduction loss. In comparison with the insulated network formed by MoO 3 /MAPbI 3 , it is speculated that the broadened absorption bandwidth and reduced absorption thickness originate from the conductive network of CNTs. As a result, when the CNTs is 7.7% (mass ratio), the reflection loss strength of MAPbI 3 /CNTs reaches −57.71 dB at 13.96 GHz and the corresponding effective absorption bandwidth is 6.32 GHz (11.68–18.00 GHz), with an absorber thickness of 1.96 mm. The method of constructing conductive network proves a great potential of hybrid perovskite in the field of electromagnetic wave absorption and provides feasible strategies for the absorption regulation of dielectric loss-type materials.
研究领域:
材料科学
·
电磁学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Min Zhang,Zihao Zheng,Fengyuan Dong,Jinming Guo,Bin Yang,Peixuan Jing,Yang Li,Ce-Wen Nan,Yuan-Hua Lin
Multilayer ceramic capacitors (MLCCs) with ultrahigh power density are fundamental components in the modern electronics industry. However, the relatively low energy density or/and efficiency are still limited by high conduction losses and hysteresis loss. To address these issues, we propose a simple and efficient design in high-entropy 1/3BiFeO 3 -1/3BaTiO 3 -1/3Ca 0.5 Sr 0.5 TiO 3 ceramics (abbreviated as BFBCST) through three different sintering aids (CuO, MgO, MnO 2 ). With optimized sintering aids, the optimal sintering temperature is reduced by 150 to 975°C. Meanwhile, the synergistic strategy effectively minimizes hysteresis loss by lowering the domain switching barriers and decreases conduction losses by suppressing the volatilization of Bi 3+ and minimizing valence variations of Fe 3+ and Ti 4+ . Therefore, an ultrahigh energy storage density of 17.9 J cm −3 with a high efficiency of 94.4% is simultaneously achieved under an electric field of 905 kV cm −1 in BFBCST-based MLCCs with MnO 2 sintering aid. This approach should be universally applicable to designing high-performance dielectrics, which holds promise for extensive applications in MLCCs.
研究领域:
材料科学
·
电子器件
·
陶瓷与介电材料
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储能技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanoscale
·
2024
·
IF 5.8
Yuke Zheng,Yunliang Dai,Yiwen Fu,Xiaojuan Zhang
Structural construction and heteroatom doping are deemed effective strategies for designing a high-performance microwave absorbing composite to eliminate electromagnetic hazards. Herein, a series of core–shell structural carbon@N-doped carbon (C@NC) nanospheres were successfully fabricated without employing additional modifying agents and sophisticated operation. After incorporating them into a polyvinylidene fluoride (PVDF) matrix, the C@NC/PVDF composites possess tunable wave attenuation capacity obtained by regulating the coating layer thickness and filler loading. Benefitting from the design strategy of the core–shell structure and N-doped C, the C@NC-2/PVDF composites displayed the broadest effective absorption bandwidth of 6.29 GHz (11.71–18 GHz) under a filler content of only 10 wt% at 2.01 mm. Additionally, the minimum reflection loss value of C@NC-3/PVDF composites achieves −62.87 dB within the same mass ratio at a thickness of 2.35 mm. The excellent wave dissipation ability is attributed to the combination of optimized impedance matching and synergistically enhanced multiple loss mechanisms including conduction loss, interfacial polarization as well as dipolar polarization. This work offers a ponderable paradigm for the deeper exploitation of high-efficiency carbon absorbers.
研究领域:
材料科学
·
电磁材料
·
微波吸收
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Linyun Zhang,Shanxin Li,Xuzhou Jiang,Hongying Yu,Yijing Sun
Metal organic frameworks (MOFs) have been widely used as microwave absorption (MA) materials owing to their varied structures and large specific surface area. However, it is still challenging to endow MOF derivatives with a rational structure to achieve outstanding microwave absorption. In this work, the hollow Co@C nanorods (HCCN) with lots of winding carbon nanotubes on the surface are obtained based on a template-sacrificing method which employs ZnO nanorods as templates and ZIF67 nanoparticles as ornaments. The HCCNs possess large pore size and specific surface area, efficiently improving the impedance matching . The 1D structure, abundant heterointerfaces and defects trigger strong conduction loss, interfacial and dipole polarization, respectively. Therefore, HCCNs exhibits excellent MA properties: the strong reflection loss of −66.8 dB at the thickness of 2.1 mm and the effective absorption bandwidth of 5.68 GHz at 2.5 mm. Radar cross section (RCS) simulation results have confirmed the practicality of HCCNs. This study proposes an inspiration for the structural designing of MOF materials and derivatives to realize amazing MA performance.
研究领域:
材料科学
·
纳米技术
·
电磁材料
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Renquan Wu,Yijing Sun,Xuzhou Jiang,Shanxin Li,Sichen Guo,Hongying Yu
In response to the increasing challenges posed by electromagnetic pollution, The development of high-performance microwave absorbing materials is increasingly urgent. This study addresses this challenge through synergistic engineering of hierarchical architectures and magnetic-dielectric components, proposing a sequential templating strategy to fabricate hierarchical multi-shell hollow porous (HMSHP) NiO/Co 3 O 4 nanospheres. Systematic characterization reveals that the HMSHP architecture can effectively improve the impedance matching, reduce the material density, extend the microwave transmission path, and significantly enhance the conduction loss and interface polarization loss. In addition, the NiO/Co 3 O 4 heterointerfaces induce polarization loss caused by lattice defects in the shell and magnetic loss due to the magnetic metal oxide components, which synergistically enhance electromagnetic energy conversion. The 3-shell hollow porous NiO/Co 3 O 4 nanospheres (3-NCO) demonstrated superior microwave absorption performance. Specifically, at a low filler ratio (20 wt%) and a thin thickness (2.1 mm), the 3-NCO nanospheres exhibited a significant absorption capacity (−67.62 dB) and a wide effective absorption bandwidth (7.68 GHz). This work reveals a nanostructure design route for designing lightweight, broadband microwave absorbers through rational integration of structural hierarchy and interfacial engineering, offering actionable strategy to fabricating novel microwave absorption nanomaterials.
研究领域:
材料科学
·
纳米技术
·
电磁学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Mengjia Shi,Zirui Jia,Di Lan,Zhenguo Gao,Siyuan Zhang,Guanglei Wu
Designing multidimensional structures of polymetallic nanocomposites has long been considered an effective way to improve polarization loss. Electromagnetic wave absorbers of different dimensions are prepared by electrospinning and high-temperature heat treatment. The 2D layered double hydroxide nanosheets are transformed into 1D metal–organic skeleton nanorods, and finally into 3D coral-like porous fibers covered with 0D nanoparticles. The coral-like fiber morphology and FeNi magnetic particles make the composite material have good impedance matching, multiple scattering reflection, conduction loss, interface polarization, thus showing excellent electromagnetic wave absorption performance. In addition, the unique 3D structure expands the propagation path and contributes to the further attenuation of electromagnetic waves. The material with multidimensional structure has the best absorbing performance, especially when the matching thickness is 2.2 mm, and the minimum reflection loss (RL min ) can reach −52.93 dB, effective absorption bandwidth (EAB) can cover 7.12 GHz at 2.0 mm. The results show that multidimensional composites have potential application prospects as practical electromagnetic wave-absorbing materials.
研究领域:
材料科学
·
纳米技术
·
电磁学
·
复合材料
·
微波吸收
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）