Inorganic Chemistry Frontiers
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2021
·Vol. 8
·期 7
·1810-1818
·
IF 6.569
Yabin Ma,Bin Quan,Zhihui Zeng,Yunke Zhang,Lan Zhang,Yu Wang,Xiaogu Huang
Strong electromagnetic (EM) response at low thickness is urgently required to address the emerging EM radiation pollution. Among numerous methods to achieve electromagnetic response at low thickness, interface construction exhibits some advantages for the combination of numerous dissipation mechanisms. Here, ternary Mo-Ni2P/rGO absorbers with multiple interfaces are designed via the phosphating treatment at a certain temperature. The constructed heterojunctions can efficiently exploit the high-conjunction of Ni2P and rGO and the interactions between different dielectric media (metal/semiconductor/conductor) for excellent electrical conductivity, abundant interfacial polarizations, and rational combination of different loss materials. As the phosphating temperature increases from 600 to 800 °C, the Mo-Ni2P/rGO-800 sample exhibits excellent microwave absorption performance, where the reflection loss (RL) value is −35.43 dB, and the effective bandwidth reaches 3.48 GHz at only 1.20 mm. This study proposes a simple method to enhance the microwave absorption performance at low thickness based on the construction of heterojunction structures. Moreover, an insight into the role of integrating different loss mechanisms in achieving high-efficiency EM wave absorbers has been fulfilled.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Yuning Shi,Xueai Li,Jinjin Yang,Kexin Jin,Wanchun Guo,Kesong Tian,Chunsheng Wang,Yahui Wang,Haiyan Wang
Carbon derived from polymers as microwave absorbing materials (MAMs) has been extensively explored owing to amelioration of balance between impedance matching and dielectric loss by strategies of morphology, nano-microstructure and intrinsic structure. Nevertheless, it is difficult to discern contribution between ohmic loss and polarization relaxation on microwave attenuation due to lack of methods to control the electrical conductivity at a certain value with distinct dipole polarization. Herein, pseudo-graphite proportion in amorphous carbon was controlled by the degree of polymerization of the precursor that was determined by the oligomerization reaction rate. The close electrical conductivities of amorphous carbon with an appropriate range of pseudo-graphite proportion provided a guarantee for impedance matching while avoiding the disparate effects of ohmic loss, thus, the synthetic amorphous carbon with a controllable pseudo-graphite proportion can be used to investigate the impact of polarization loss on the dissipation of microwave. The relative lower pseudo-graphite proportion within limits provided abundance of defects, provoking dipole polarization loss to achieve enhancement of microwave attenuation. The synthetic amorphous carbon with an appropriate proportion of pseudo-graphite phase exhibited excellent microwave absorption with an effective absorption bandwidth (EAB) of 6.64 GHz at a thickness of 2.2 mm over the whole Ku band. This work provided an efficient method to research the contribution of dipole polarization on electromagnetic response and found an effective direction to achieve broad bandwidth response at low thickness for carbon MAMs.
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Peng Huang,Yifei Wang,Shengling Yuan,Hui Huang,Lijia Xu,Yongpeng Zhao
Metal oxides have attracted much attention due to their potential in electromagnetic wave absorption. However, the inherent energy dissipation capabilities of low-entropy metal oxides pose challenges in designing materials with optimal entropy levels. The regulation of entropy structure is anticipated to facilitate the development of novel electromagnetic functional materials featuring abundant active sites, adjustable specific surface area, stable crystal structure, unique geometric compatibility, and distinctive electronic structure. This study compared the electromagnetic loss performance of low, medium, and high entropy metal oxides in carbon matrices. As entropy increases, the number of phases expands, leading to enhanced interface polarization losses and improved impedance matching. However, further increases in entropy result in performance decline due to lattice distortions and mismatches in dielectric constant and magnetic permeability. Experimental data and theoretical analysis reveal that performance enhancement in medium-to high-entropy metal oxides is attributed to their unique morphology and the synergistic effects of multiple metal components, which enhance interfacial and defect polarization mechanisms. Heterogeneous interfaces and lattice defects provide additional polarization sites, aiding in the conversion of electromagnetic energy into heat. The presence of intermediate phases effectively absorbs and dissipates electromagnetic waves, thereby enhancing the overall absorption capability.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Ruixiang DENG,Bingbing CHEN,Haogeng LI,Zhong LI,Tao ZHANG,Yun YU,Lixin SONG
Microwave shielding materials and absorbers serve important roles in improving the reliability of smart devices and military equipment. In this work, three-dimensional (3D) Ti 3 C 2 T x /Fe 3 O 4 composites with adjustable electromagnetic responses are studied. Taking advantage of the negatively charged surface of the Ti 3 C 2 T x , the cationic surfactant cetyltrimethylammonium bromide (CTAB) is used to precipitate the delaminated Ti 3 C 2 T x sheets. The volatilization of CTAB during the annealing process inflates the Ti 3 C 2 T x , and leads to the three-dimensional architecture of the composite. The results show that the free-standing 3D Ti 3 C 2 T x /Fe 3 O 4 composite film exhibits a high shielding efficiency of 60 dB in the X band. Owing to the traits of great flexibility, low apparent density, and thin thickness, the 3D Ti 3 C 2 T x /Fe 3 O 4 composite film achieves a high specific shielding efficiency of 3.5 × 10 5 dB/(g·cm −2 ). Furthermore, through the control of crystal defects in one-step annealing treatment, the shielding material can be transformed into a wideband microwave absorber. A high reflection loss up to −57 dB can be realized. And a 2-mm-thick absorber whose reflection loss is better than −10 dB in 11.2 ~ 18 GHz is also achieved. The experimental and first-principal studies on the evolution mechanism reveal that the destruction of the Ti-C bond mainly leads to the degradation of electrical conductivity and the improvement of impedance matching. Introduced crystal defects can help enhance the dielectric loss as well. The synergistic effects of ohmic loss, dielectric loss, and magnetic loss give birth to a broadband absorption of the composite.
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2024
·
IF 13
Honghan Wang,Xinyu Xiao,Qingda An,Zuoyi Xiao,Kairuo Zhu,Shangru Zhai,Xiaoling Dong,Chuang Xue,Hongjing Wu
An emerging carbothermal shock method is an ultra-convenient strategy for synthesizing high-entropy alloys (HEAs), in which the intelligent combination of carbon support and HEAs can be serve as a decisive factor for interpreting the trade-off relationship between conductive gene and dielectric gene. However, the feedback mechanism of HEAs ordering degree on electromagnetic (EM) response in 2–18 GHz has not been comprehensively demystified. Herein, while lignin-based carbon fiber paper (L-CFP) as carbon support, L-CFP/FeCoNiCuZn-X with is prepared by carbothermal shock method. The reflection loss of −82.6 dB with thickness of 1.31 mm is achieved by means of pointing electron enrichment within L-CFP/FeCoNiCuZn HEAs heterointerfaces verified by theoretical calculations. Simultaneously, low-frequency evolution with high-intensity and broadband EM response relies on a “sacrificing” strategy achieved by construction of polymorphic L-CFP/semi-disordered-HEAs heterointerfaces. The practicality of L-CFP/FeCoNiCuZn-X in complex environments is given prominence to thermal conductivity, hydrophobicity, and electrocatalytic property. This work is of great significance for insightful mechanism analysis of HEAs in the application of electromagnetic wave absorption.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Wenjing Yu,Gaofeng Shao
Graphene with abundant defects has been considered as the most lightweight electromagnetic functional materials . Although important, the dominant electromagnetic response of defective graphene with diverse morphologies is rarely the focus of existing research. Herein, the defective graphene with two-dimensional planar structure (2D-ps) and three-dimensional continuous network (3D-cn) morphologies were dexterously designed with 2D mixing and 3D filled systems of polymeric matrix. A comparison between the topologies of defective graphene-based nanofillers and the microwave attenuation behaviors was examined. Defective graphene with 3D-cn morphology can achieve ultralow filling content and broadband absorption, which is attributed to the presence of numerous pore structures that promote impedance matching, induce continuous conduction loss and provide multiple reflection and scattering sites for electromagnetic wave attenuation. Comparatively, by virtue of the increased filling content of 2D-ps, the dielectric losses primarily originate from the dielectric genes, including aggregation-induced-charge transport, abundant defect and dipole polarization, resulting in good microwave absorption at low thickness and low frequency. Therefore, this work provides a pioneering insight into morphology engineering of defective graphene microwave absorbers, and it will guide future exploration of customizing high-performance microwave absorption materials based on graphene-based low-dimensional building blocks.
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS RESEARCH BULLETIN
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2024
·
IF 5.3
Wenshuang Chu,Kaifeng Wang,Siyu Liu,Yujie Chen,Hua Li,Hezhou Liu
Confronted with ever-increasing electromagnetic radiation problems, developing microwave absorbing materials with tunable effective absorption bandwidth (EAB) is in high demand. In this work, chitosan-derived carbon-based aerogel was synthesized by unidirectional freeze-drying and the following high-temperature carbonization process. The dielectric-magnetic coupling effect was facilitated by the construction of the 3D conductive network, along with the decoration of the Co nanoparticles and the doping of heteroatoms within the carbon-based framework. Therefore, the aerogel achieved minimum reflection loss intensity of -44.30 dB at 5.20 GHz when carbonizing the precursor at 800 °C. More significantly, the strain-responsive properties of the aerogel endows it with tailorable electromagnetic response behaviors, thereby controlling the effective absorption bandwidth covering from X band to Ku band. This work paves the way for designing next-generation microwave absorption materials with tunable microwave absorption bandwidth, catering to stringent practical requirements prospectively.
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Changfeng Li,Ge Wang,Mengyue Peng,Chenwei Liu,Tangfeng Feng,Yunfei Wang,Faxiang Qin
Reconfigurable metamaterial absorbers (MAs), consisting of tunable elements or deformable structures, are able to transform their absorbing bandwidth and amplitude in response to environmental changes. Among the options for building reconfigurable MAs, origami/kirigami structures show great potential because of their ability to combine excellent mechanical and electromagnetic (EM) properties. However, neither the trial-and-error-based design method nor the complex fabrication process can meet the requirement of developing high-performance MAs. Accordingly, this work introduces a deep-learning-based algorithm to realize the fast inverse design of origami MAs. Then, an accordion-origami coding MA is generated with reconfigurable EM responses that can be smoothly transformed between ultrabroadband absorption (5.5–20 GHz, folding angle α = 82°) and high reflection (2–20 GHz, RL > −1.5 dB, α = 0°) under y-polarized waves. However, the asymmetric coding pattern and accordion-origami deformation lead to typical polarization-sensitive absorbing performance (2–20 GHz, RL > −4 dB, α < 90°) under x-polarized waves. For the first time, a kirigami polarization rotation surface with switchable operation band is adapted to balance the absorbing performance of accordion-origami MA under orthogonal polarized waves. As a result, the stacked origami-kirigami MA maintains polarization-insensitive ultrabroadband absorption (4.4–20 GHz) at β = 0° and could be transformed into a narrowband absorber through deformation. Besides, the adapted origami/kirigami structures possess excellent mechanical properties such as low relative density, negative Poisson’s ratio, and tunable specific energy absorption. Moreover, by modulating the PEDOT:PSS conductive bridges among MXene nanosheets, a series of low-concentration MXene-PEDOT:PSS inks (∼46 mg·mL–1) with adjustable square resistance (5–32.5 Ω/sq) are developed to fabricate the metamaterials via screen printing. Owing to the universal design scheme, this work supplies a promising paradigm for developing low-cost and high-performance reconfigurable EM absorbers.
研究领域:
电磁学
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材料科学
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人工智能设计
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柔性电子器件
✓ 已验证
DOI
高影响因子
Small
·
2023
·Vol. 19
·期 21
·2300233
·
IF 13.3
Tian Li,Jinzhe Li,Zhengkan Xu,YingRui Tian,Jiatong Li,Jiani Du,Fanbin Meng
Nowadays, the rapidly development of advanced antidetection technology raises stringent requirements for microwave absorption materials (MAMs) to focus more attention on wider bandwidth, thinner thickness, and lower density. Adding magnetic medium to realize broadband absorption may usually result in the decline of service performance and accelerating corrosion of MAMs. Chiral MAMs can produce extra magnetic loss without adding magnetic medium due to the unique electromagnetic cross polarization effect. However, more efforts should be taken to furtherly promote efficient bandwidth of chiral MAMs and reveal attenuation mode and modulation method of chiral structure. Herein, a novel superhelical nano-microstructure based on chiral polyaniline and helical polypyrrole is successfully achieved via in situ polymerization strategy. The enhanced multiscale-chiral synergistic effect contributes to broaden effective absorption bandwidth, covering 8.6 GHz at the thickness of 3.6 mm, and the minimum reflection loss can reach −51.3 dB simultaneously. Besides, to further explain response modes and loss mechanism of superhelical nano-microstructures, the electromagnetic simulation and test analysis are applied together to reveal their synergistic enhancement attenuation mechanism. Taken together, this strategy gives a new thought of how to design, prepare, and optimize the hierarchical structure materials to achieving broadband and high-performance microwave absorption.
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
iScience
·
2022
·
IF 6.107
Can Zhang,Yuning Shi,Xueai Li,Hongjing Wu,Youfei Shen,Wanchun Guo,Kesong Tian,Haiyan Wang
Summary Constructing sophisticated 3D structure has been shown to be fruitful in developing carbon nanotubes (CNTs) microwave absorbers (MAs). However, issues with the unclear electromagnetic (EM) responding synergy of CNTs toward substrate and the limited dissipation property caused by the large dense CNTs networks throughout the reported models still need to be resolved. Inspired by the creeper-window-room-structured architecture, an analogous conformal nanostructure of amorphous carbon/CNTs (N-AC/CNTs) hybrid is constructed through an in situ autocatalytic planting approach. By this model, not only the inheritance of frequency dependence characteristic but the co-inheritance of lossy behavior and impedance matching is demonstrated. Moreover, by virtue of the unique structure, a synergistic reinforcing dielectric loss from conductive loss and dielectric polarization was introduced. Therefore, N-AC/CNTs-750 shows impressive EM performance. This work hereby unveils the synergy of EM response from CNTs toward substrate, and provides a pioneering insight into developing architecture-inspired structure engineering to construct high-performance MAs.
研究领域:
材料科学
·
电磁学
·
纳米技术
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2025
·
IF 3.3
Jun Cao,Chengsheng Wang,Zechao Xu,Kelan Yan,Liming Shen,Zheng Huang,Lingjie Zhang,Runhua Fan,Ningzhong Bao
Metamaterials exhibiting simultaneous negative permittivity (ε < 0) and negative permeability (μ < 0) offer exceptional electromagnetic properties, enabling advanced applications such as subwavelength imaging, wireless power transfer, and advanced antenna systems. Chromium-based selenium spinel composites have emerged as promising candidates for random double-negative metamaterials (DNMs), although achieving tunable and desired double-negative characteristics remains challenging. Here, CoCr2Se4, distinguished by high magnetic spin resonance in high-frequency fields and low conductivity, was selected to modulate the electromagnetic properties of CuCr2Se4-based composites. A series of (1 − x)CuCr2Se4·xCoCr2Se4 samples were synthesized via a solid-state reaction. Double-negative properties were achieved in the MHz frequency ranges, specifically within 841–1000 MHz for x = 0.2, 638–1000 MHz for x = 0.4, and 484–1000 MHz for x = 0.6. The negative permittivity arises from the plasma oscillations of delocalized carriers, well described by the Drude model. Meanwhile, negative permeability is explained through the suppression of eddy currents–due to the low conductivity of CoCr2Se4-which mitigates skin-depth limitations and enhances magnetic resonance. This composite design not only reduces electromagnetic attenuation but also improves magnetic responsiveness under alternating fields. By clarifying the selection rationale for metallic ferromagnetic spinel composites, this work enhances the theoretical understanding and tuning mechanisms of negative ε and μ. It thereby broadens the scope of metamaterial research and facilitates the development of single-phase double-negative materials, especially for low-frequency near-field applications.
研究领域:
材料科学
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电磁学
·
凝聚态物理
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功能材料
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无机固体化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Kui-Bin Cui,Cheng-long He,Jian-Hua Wu,Xing Gao,Yong Li,Pei Han,Ning-Ning Sun,Yu-Fei Wang,Xi-Hong Hao,Lin Li,Mao-Sheng Cao
Multispectrum response technology is the key to developing multifunctional electromagnetic devices in cross-field applications. Traditional methods rely on integrating complex multi-material systems, leading to bulkier and costlier devices. Here, a hierarchical heterodimensional structure composed of FeNiHo alloy and carbon matrix achieves autonomous multispectrum-coupling electromagnetic response between microwave and ultraviolet through polar interface engineering. In the microwave band, the heterodimensional structure exhibits outstanding microwave absorption performance with high reflection loss of −46.87 dB and ultra-wide absorption bandwidth of 8.96 GHz. Furthermore, the antenna arrays based on the heterodimensional structure demonstrate in situ microwave frequency-agile property by a coupled ultraviolet stimulation, where the largest frequency modulation range reaches 5.05 GHz in Ku-band. In the ultraviolet band, multimode photodetectors constructed by the heterodimensional structure possess excellent responsivity and accurate decoding ability for anti-interference ultraviolet communication. Particularly, the metamaterial detector achieves analog signal communication for the first time by microwave-ultraviolet coupling response. This work pioneers a novel approach to developing multifunctional electromagnetic materials for multispectrum applications.
研究领域:
材料科学
·
电磁学
·
微波工程
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光电子学
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纳米技术
·
超材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）