Nanoscale
·
2022
·Vol. 14
·期 29
·10375-10388
·
IF 8.307
Congyu Zhou,Zhengjun Yao,Bo Wei,Wenying Li,Zhejia Li,Xuewei Tao,Jintang Zhou
The increasing hazard of electromagnetic radiation prompts people to pursue absorbing materials with better performance. However, absorbing materials with a single loss mechanism usually is unable to obtain better absorbing performance due to low impedance matching or high filling ratio. Therefore, this work proposes a C/NiCo2S4 (CNCS) material with both dielectric loss/magnetic loss to achieve efficient absorption of electromagnetic waves. The simple preparation of CNCS materials was achieved through the etching of the ZIF-67 template by nickel nitrate and the subsequent hydrothermal vulcanization process. Its unique prismatic dodecahedron hollow structure promotes multiple scattering of electromagnetic waves. The attachment of the magnetic NiCo2S4 particles on the surface of the carbon template further promotes the interface polarization and dipole polarization, which is equivalent to the formation of a resistance-rich microcircuit and enhances the effect of the conductance loss on electromagnetic waves. At 2–18 GHz, the CNCS-2 with 30% paraffin addition achieves an effective bandwidth of 5.54 GHz at a matching thickness of 1.7 mm, and has a maximum reflection loss of −36.44 dB at 1.5 mm. By adjusting the thickness of the material matching layer (1–3 mm), an effective bandwidth of up to 13.48 GHz can be achieved, perfectly covering the X-band and Ku-band. Based on the simple preparation process of the material, the special hollow structure and the multiple loss mechanisms for electromagnetic waves, we believe that CNCS can become a strong competitor for high-efficiency broadband absorbers.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 7
·4057-4066
·
IF 10.7
Xiao Li,Haowei Zhou,Jinlin Zhang,Xinyue Zhang,Man Li,Jieyan Zhang,Moustafa Adel Darwish,Tao Zhou,Shi-Kuan Sun,Lei Xie,Di Zhou
Carbon materials have been widely recognized as one of the important candidates for superior microwave absorbers, but further enhancement of their properties (especially for a wide bandwidth) is still a great challenge. In this study, we developed a simple soft template-carbonization method to construct special shell-like carbon superstructures used for significant enhancement of microwave absorption. Through an interfacial self-assembly process using ribose as the carbon precursor, a copolymer as the soft template, and sulfuric acid as the catalyst, three microstructurally distinct carbon materials: sphere-like, rod-like, and shell-like carbon superstructures can be prepared by simply adjusting the amount of the structure-guiding agent PSSMA. Owing to the unique semi-hollow cavity structure of the shell-like carbon superstructures, the conductive loss and polarization loss are synergistically regulated, accompanied by the synergistic improvement of their impedance matching and loss capability. As a result, the shell-like carbon superstructures hold excellent electromagnetic wave absorption capability, in which the reflection loss (RL) can reach −49.14 dB and the effective absorption bandwidth (EAB) can reach 8.24 GHz. The relationships between the morphological structure, microscopic loss mechanism, and macroscopic microwave absorption performance are also investigated in detail. In addition, under far-field conditions, the shell-like carbon superstructures are characterized by a high degree of conductivity and polarization loss compared with PEC. Besides, the maximum radar cross-section (RCS) reduction of shell-like carbon superstructures reaches 31.19 dB m2 compared with PEC under far-field conditions, which again verifies that shell-like carbon superstructures can dissipate more electromagnetic waves in real environments. This work provides a reference for the rational construction of new high-performance carbon superstructure microwave absorbers.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2024
·
IF 4.3
Linyun Zhang,Shanxin Li,Xuzhou Jiang,Hongying Yu,Yijing Sun
Carbonaceous materials have great prospects in microwave absorption due to their lightweight and corrosion resistance. However, their high conductivity leads to poor impedance matching, posing a significant challenge for obtaining outstanding microwave absorption (MA) materials from carbonaceous materials. In this work, the core-shell ZnO/C nanorods (ZCNs) are prepared by covering conductive carbon on the surface of ZnO nanorods through a simple stirring process in ambient temperature and calcination treatment. The thickness of carbon shell is carefully regulated to realize appropriate impedance matching and strong microwave dissipation capability. ZCN with 30.2 nm of carbon shell achieves outstanding microwave absorption in low frequency and broadband microwave absorption because of the synergies of optimized impedance matching and enhanced dielectric loss: the reflection loss of 49.9 dB at 6.32 GHz, and the effective absorption bandwidth of 6.4 GHz at a corresponding thickness of 2.0 mm. RCS simulation results have verified its excellent performance in practical application. This study proposes a simple and effective idea for the efficient utilization of carbonaceous materials in microwave absorption.
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 THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Chuanqing Zhao,Shiqi Xia,Yizhe Lv,Huimin Qi,Shifeng Deng
Based on the micro-nano scale designs for absorbing materials, analyzing the influence of microstructures on absorbing properties is a feasible strategy to achieve efficient lightweight broadband electromagnetic wave absorbers. In this work, the silicon-containing arylacetylene resin, serving as a ceramic polymer precursor, is employed to coat SiO 2 gel. Subsequently, the PSA/SiO 2 aerogel underwent carbothermal reduction and the polymer-derived ceramics process, transforming it into a SiC/C aerogel. This SiC/C aerogel exhibits a low density of 0.2 g/cm³ and a high porosity of 68 %. The rich morphology of SiC/C aerogel is conducive to both interfacial polarization and multiple scattering, resulting in excellent impedance matching and attenuation. With a reflection loss of −52.6 dB and an effective absorption bandwidth of 6 GHz, SiC/C aerogels also achieve effective absorption in both the X and Ku bands. These results may thus be of great significance in guiding the design and mechanism investigation of high-performance.
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 MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 19
·1-14
·
IF 2.8
Ding Hongyu,Yang Yujie,Li Hao,Zhang Zhenyu,Geng Zhihao
In this study, AlCoCrFeNi high-entropy alloys (HEAs) powder is passivation-modified with phosphoric acid passivation solution and annealed under nitrogen atmosphere. Magnetic high-entropy alloy composites exhibiting low magnetic loss at low frequencies and high wave-absorbing performance at high frequencies have been successfully synthesized. X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS) are used to study and analyze the phase changes, micro-morphology and surface element distribution of the composite materials. The magnetic permeability and magnetic loss of the composites at low frequencies are measured by B-H analyzer. The wave absorbing properties at high frequencies are characterized and tested using a vector network analyzer (VNA). It can be found that the physical phase of the high-entropy alloy composites after phosphoric acid passivation does not change significantly, but fine phosphate-containing passivation layers can be observed on the surface. The magnetic loss of the passivated composites at low frequencies is significantly reduced, with the lowest loss of 219.8 mW/cm 3 (1000 kHz, B m = 5mT) at 0.6 wt% phosphoric acid addition. The electromagnetic absorption performance is also improved to different degrees. The high-entropy alloy composites modified with 1.0 wt% phosphoric acid have the best absorption performance with the minimum reflection loss of − 36.494 dB with a matching thickness of 2.5 mm and the maximum effective absorption bandwidth of 6.16 GHz.
研究领域:
材料科学
·
电磁学
·
冶金工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Yang Li,Yuchang Qing,Biao Zhao,Pengwei Bai,Rui Zhang,Haoyang Yao,Fa Luo
There are few reports on the application of Magnéli Ti 4 O 7 in the field of electromagnetic wave absorption. Herein, we designed and prepared a Ti 4 O 7 /magnetic metal composite via an electrostatic assembly with in-situ reduction reaction. This system utilized distinct magnetic coupling deriving from the subtle designed structures and magnetic-dielectric synergy. The core-shell magnetic metallic nanoparticles/oxygen deficient Ti 4 O 7 are useful microwave absorbers in terms of wide broadband, strong absorption and ultra-low filler amount. The optimal reflection loss of Ti 4 O 7 @CoNi composite was −43.6 dB at 2.5 mm, meanwhile the effective absorbing band could reach over 5.12 GHz at only a 2.7 mm thickness. The results confirm that the dependence of the electromagnetic characteristics of the absorber on the filler ratio, frequency, and absorber thickness. Therefore, this work may be beneficial in constructing core-shell structured magnetic metal/Magnéli Ti 4 O 7 composites to tune electromagnetic parameters and strengthen electromagnetic absorption.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
Nano Energy
·
2021
·
IF 17.881
Caiju Chen,Huyun Liu,Haitao Wang,Yawen Zhao,Ming Li
Solar vapor generation utilizes ubiquitous solar energy to address the issue of global water shortage. However, its large-scale field deployment is greatly hampered by inefficient solar absorption, moderate evaporation efficiency and high cost. Here, we report a new hybrid photothermal membrane, named broadband plasmonic Cu 2−x Te nanowire (bpCu 2−x Te) membrane, for interfacial solar evaporation to produce freshwater from various water sources. The bpCu 2−x Te membrane features excellent broadband solar absorption (~95.9%), high porosity and hydrophilicity , and low thermal conductivity (0.55 W/(m K)), which enables a water evaporation rate as high as 4.3 kg/(m 2 h) with the evaporation efficiency of up to 96% under 3 kW/m 2 solar irradiation . The evaporation performance of the present Cu 2−x Te membrane can be maintained even after it recycles multiple times under various solar irradiance, indicating excellent durability and stability. Efficient solar desalination of seawater is further demonstrated with the bpCu 2−x Te membrane to deliver drinkable water. The combination of scalable fabrication ability, low cost and excellent solar evaporation performance of the bpCu 2−x Te membrane highlights the potential for seawater purification and desalination in field applications.
研究领域:
材料科学
·
能源科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 58
·期 1
·211-229
·
IF 4.682
Wang Chenxu,Ding Jiawei,Gong Chuangchuang,Chen Tong,Zhang Yijing,Song Kai,Shi Chunsheng,He Fang
In order to tackle the electromagnetic pollution caused by the application of electromagnetic wave (EMW) in wireless communication, military industry, and other fields, broadband EMW absorption materials are urgently needed. To achieve this goal, emerging methods resort to constructing multivariate synergistic composites with unique morphology to enhance EMW absorption through diverse loss mechanisms and prominent structural advantage. Herein, a spatially tuned confinement pyrolysis strategy is proposed to design pomegranate-like MnO@NC absorption material. Unique hierarchical structure and more scattering sites are accessed via well-designed one-shell multiple cores nanostructure. N-doped carbon acts as an interwoven conductive network and restricts the movement of EMW in the shell, while nano-MnO acts as an impedance matching phase and interferes with the continuity of EMW. Moreover, the intercalation of dispersed MnO also amplifies the contribution of interfacial effect to EMW absorption, which can be verified by the calculation of the surface work function. The optimized composite possesses a maximum absorption bandwidth of 6.51 GHz at 2.4 mm and its maximum reflection loss reaches − 58.4 dB ( d = 2.3 mm). The synthesis of pomegranate-like composite provides a new direction for fabricating advanced carbonate-based EMW absorbers which are toward practical application. Graphical abstract
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2024
·
IF 16.8
Jiawei Ding,Houjiang Liu,Chuangchuang Gong,Jin Cui,Yijing Zhang,Hongwei Cong,Chunnian He,Naiqin Zhao,Chunsheng Shi,Fang He
With the boom in 5 G technology comes widespread concern about electromagnetic (EM) interference and the safe use of electronics. Conventional electromagnetic wave (EMW) absorbing materials in the form of coatings are often inflexible and poorly adapted to different EM environments. Diversified application scenarios require EMW absorbing materials with a wide absorption band and multifunctional properties. Herein, the frequency dispersion (FD) requirements of the EM parameters of the broadband absorber in different frequency bands are determined by EM simulation. Based on the dominant role of interface polarization on FD, we designed different types of heterogeneous interfaces to meet the needs of strong FD in the low-frequency band and weak FD in the high-frequency band. Through the optimized design of heterogeneous interfaces, CC@ZnO/ZnS composites exhibit excellent EMW absorption performance, achieving flexible, ultrathin (2.1 mm), ultralight (10 wt%), and broadband (7.02 GHz), which is superior to EMW absorbing materials of similar compositions. In addition, the composites have good piezoelectric/inverse piezoelectric properties, which can convert EM energy into mechanical energy while absorbing EMW, thus realizing applications in multifunctional fields such as sensors, controllers and energy converters. More noteworthy is the sample's highly efficient thermal insulation, flame retardant and anti-frosting properties, demonstrating important advantages for service in harsh environments. Therefore, CC@ZnO/ZnS composites not only have good practical application characteristics while realizing broadband absorption, but also are expected to achieve multifunctional applications in different fields.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
Small Structures
·
2025
·
IF 11.3
Tian Li,JiaTong Li,DanDan Zhi,Jinzhe Li,Wenting Deng,RunHua Zhang,Renchi Qin,Qing Qi,Chul B. Park,Li Ma,Fanbin Meng
In response to the increasing need for high-performance microwave absorption materials (MAMs), this study introduces a multiaxis electrospinning method for synthesizing graphene-based aerogel microspheres (GAMs) aimed at broadband microwave absorption (MA). The micro/nanostructures and shell configurations of GAMs are effectively regulated and controlled to establish a predictable structure-properties relationship via establishing equivalent electromagnetic (EM) models. The computational simulations results of the structure–property relationship are employed as guidance to evaluate the effects of structural features, like hollow structures and multilayered shells. The analysis reveals that enhancing the hollow cavity optimizes impedance matching and promotes MA performance. Utilizing these insights, the fabricated hollow GAMs (HGAMs) achieve an effective absorption bandwidth (EAB) of 8.1 GHz and an optimal reflection loss of −34.8 dB at 3.3 mm thickness. Further simulations involving various hierarchical structures of GAMs arranged into mono/bilayer arrays investigate the group coupling effects on MA performance through the synergistically absorptive, interferential, and resonant attenuation mechanisms. Actual MA performance examination using an arch method on HGAM bilayer arrays confirms the simulations, achieving an EAB of 15 GHz at a thickness of 7 mm. Consequently, this approach demonstrates a promising avenue for developing lightweight, nanostructured MAMs suitable for advanced applications.
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
JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 43
·20268-20282
·
IF 3.5
Qiu Hongfang,Peng Jian,Xu Weiwei,Fang Xiong,Lu Junyu,Di Xiaochuang,Lu Zhao,Chen Yang,Zou Huawei
The use of microwave absorption (MA) materials in practical aerospace applications would be challenging without a dependable mechanical support structure. However, achieving a wide effective absorption bandwidth (EAB) in aramid honeycomb structures at low weight gain is crucial for the practical aerospace applications of MA materials. To address this challenge, this study proposes a combination of porous carbon foam and high structural strength honeycomb to achieve broadband microwave absorption in structural devices through the synergistic effect of carbon foam absorption and honeycomb structure. The uniform filling process of ultra-lightweight reduced GO aerogel is achieved through freeze-drying, solving the issues of uneven dispersion and incomplete filling of traditional absorbers in honeycombs. Further optimization and comprehensive evaluation of filling concentration and reduction process were carried out. The freeze-drying process combined with chemically reduced honeycomb samples filled with different concentrations of GO all exhibit broadband absorption performance. At a specific standard honeycomb thickness of 15 mm, uniformly filled honeycomb samples with 0.1 to 0.3% GO exhibit triple resonance peaks near 2–3 GHz, 8–9 GHz, and 15 GHz, with effective absorption peaks all below − 10 dB. Moreover, the incorporation of transparent wave honeycomb walls in conjunction with honeycomb materials enhances the overall impedance matching, leading to a further improvement in the EAB to 10.53 GHz for the honeycomb sample filled with 0.2% freeze-dried and reduced GO. CST simulation data confirms that the loss in the honeycomb samples originates from uniform conduction loss, and the electric field stably enters the interior of the honeycomb. This approach, based on the rapid and efficient filling of uniform RGO by freeze-drying, provides a new way to achieve broadband microwave absorption in aramid honeycombs and has significant potential for development in the field of aerospace stealth.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 32
·期 6
·2108194
·
IF 18.808
Huibin Zhang,Junye Cheng,Honghan Wang,Zehao Huang,Qingbin Zheng,Guangping Zheng,Deqing Zhang,Renchao Che,Maosheng Cao
VB-Group transition metal disulfides (TMDs) are considered excellent materials for electromagnetic wave (EMW) absorption because of their good conductivity and abundant active sites located at their edges and substrates, as compared with VIB-Group TMDs. Herein, for the first time, EMW absorbers based on VB-Group NbS 2 nanosheets by using a facile one-step solvothermal method are successfully prepared. The minimum reflection loss (RL min ) can reach up to 43.85 dB with an effective absorption bandwidth of 6.48 GHz (11.52–18.00 GHz). The remarkable EMW absorption performance can also be reflected in the tunable frequency bands (C-, X-, and Ku-bands), which is achieved by adjusting the contents of materials. Furthermore, the influence of the content of 2H-phase and 1T-phase in NbS 2 on the EMW absorption performance is systematically investigated. The hierarchical hollow-sphere structure of NbS 2 promotes dielectric loss and the multiple reflection and absorption of EMW, and enhances the impedance matching and synergistic attenuation ability. This work demonstrates that the bottleneck of effective absorbing frequency band of single-component dielectric EMW absorbing materials could be broken through, and paves a novel path towards developing broadband absorbing materials in EMW absorption.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）