JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Jixing Chai,Junye Cheng,Deqing Zhang,Yingfei Xiong,Xiuying Yang,Xuewei Ba,Sana Ullah,Guangping Zheng,Ming Yan,Maosheng Cao
The 2D molybdenum disulfide nanosheets (MoS 2 -NS) has exhibited great potential in electromagnetic wave absorbing (EMA) due to larger surface area and peculiar electronic properties. However, due to the poor impedance matching and limited electromagnetic loss capability of pure MoS 2 -NS, its practical applications are significantly challenging. Herein, we firstly implanted Co 3 O 4 nanoparticles (Co 3 O 4 -NPS) on MoS 2 -NS by a facile hydrothermal method to improve the EMA performance. The resulting MoS 2 /Co 3 O 4 hybrids exhibit the minimum reflection loss (RL) value of −43.56 dB at 6.96 GHz with 20 wt% Co 3 O 4 loading under the samples thickness of 4.0 mm. The widest bandwidth with the RL value less than −10 dB of MoS 2 /Co 3 O 4 hybrids was determined to be 4.76 GHz (13.24 to 18 GHz) under the absorber thickness of 2.0 mm. The excellent performance is ascribed to that implanted Co 3 O 4 -NPS on MoS 2 -NS could turn tuning impedance matching and improving synergetic magnetic loss and dielectric loss. Herein, this work not only presents a facile strategy of achieving high-performance MoS 2 -based EMA materials, but also provides important implications for designing the other EMA materials.
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 ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Chunjie Li,Xin Qian,Mengyuan Hao,Xuefei Wang,Shiqi Zhu,Mei Guo,Haoting Gong,Yonggang Zhang
PAN-based carbon fibers have been widely used in aerospace materials due to high specific strength , high specific modulus and many other outstanding features. As one kind of carbon-based electromagnetic wave (EMW) absorption material, carbon fibers are expected to absorb more EMW due to multiple polarization losses and large specific surface area in which EMW can be reflected many times. However, they also have certain disadvantages when used as EMW absorption material due to their high dielectric constant, low permeability and low reflection loss strength. Herein, a facile hydrothermal synthesis method was used to construct the three-dimensional (3D) bimetal-organic framework compound onto the surfaces of polyacrylonitrile(PAN)-based ultrahigh modulus carbon fibers (UHMCFs). Through the control of key parameters in the synthesis process, 3D bimetallic ZIF particles with different morphologies were assembled on the fiber surfaces, and a further high temperature heat treatment resulted in significantly improved EMW absorption properties. The results showed that three fibrous structures including rod-shaped, threadlike and flower-like morphologies had been formed with the introduction of CoZn-ZIFs. Among them, the uniform structure of rod-shaped sample could be preserved after carbonization and it also showed optimal EMW absorption performance, e.g. its minimum reflection loss (RL min ) and effective absorption bandwidth (EAB) values were − 67.67 dB (EMW loss above 99.9 %) and 4.28 GHz, respectively, with the thickness of 2.00 mm. In the final, the EMW absorption mechanism of CoZn-bimetallic ZIF decorated UHMCFs including interfacial loss, conductive loss, polarization loss, multiple scattering and excellent impedance matching was discussed in detail.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2023
·
IF 10.9
Shuai Zhang,Ying Huang,Jiaming Wang,Xiaopeng Han,Guozheng Zhang,Xu Sun
Flexible energy storage systems and electromagnetic pollution have become issues that need to be resolved in equipment research and development due to the widespread use of portable electronic devices and 5G networks . MXene is competent for supercapacitors and electromagnetic wave absorbers through sensible composite and microstructure design. Herein, Cu 1.5 Mn 1.5 O 4 Hollow Nanosphere Decorated Ti 3 C 2 T x MXene (CuMnHS@MX) was prepared by simple electrostatic self-assembly. Hybrid membranes can be quickly prepared by vacuum-assisted filtration. CuMnHS@MX exhibits excellent electromagnetic wave absorption performance and electrochemical energy storage properties. High specific capacitance (2089 mF/cm 2 at 2.5 mA/cm 2 ) and excellent cycle stability (99.89% after 8000 cycles) are achieved, which are attributed to the increased interlayer spacing and improved interlayer ion transport efficiency. When assembled into symmetrical flexible all-solid-state supercapacitor (SC), the device has a specific capacitance of 382.9 mF/cm 2 and an energy density of 53.18 μWh/cm 2 at a power density of 277.8 μW/cm 2 . Meanwhile, CuMnHS@MX has advantageous absorbing properties. When the thickness is 4 mm, the minimum reflection loss (RL min ) is −53.42 dB at 6.08 GHz. Adjustable absorbing property is achieved, and the absorbing energy efficiency can cover X and most C, Ku bands . These excellent EMA properties are derived from the 3D structure and rich dipole/interface polarization. CuMnHS@MX is a promising bifunctional material for electrochemical energy storage and electromagnetic wave absorption.
研究领域:
材料科学
·
能源存储与转换
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Nano
·
2023
·
IF 10.3
C. Qian,D. Wang,W. Zhao,W. Yang,Z. Qin,Y. Zhu,B.B. Xu
With the development of communication and electronic technologies, smart electromagnetic wave (EMW) absorption materials with tunable performance are highly desirable for applications under complicated electromagnetic circumstances. However, the performance of the ordinary EMW absorption materials is dominated by their electromagnetic parameters which are constant unless their compositions are changed. This study presents a porous EMW absorption material with adjustable effective absorption bandwidth (EAB) and reflection loss (RL) to satisfy the requirements of tunability for complex electromagnetic applications. First, a composite foam is fabricated by assembling the reduced graphene oxide (rGO) to the melamine sponge (MS) framework. Next, the thermoplastic polyurethane (TPU) is introduced to endow the MS/rGO composites with the desired shape memory property after crosslinking. In specific, the obtained MS/rGO composites show high flexibility, elasticity, and low density of 10.7 mg cm −3 , and present the minimum RL of −63.29 dB with EAB of 7.18 GHz. Additionally, the tunable EMW absorption performance of MS/rGO-TPU composites is achieved through their shape memory effect. Notably, the EAB can be adjusted to a wide range from 5.5 to 18 GHz under the compressive deformations of those composites as modulated by cooling/heating, and correspondingly the minimum RL changes from −15.4 dB down to −39.2 dB. In a word, the smart, lightweight MS/rGO and MS/rGO-TPU composite foams with adjustable EMW absorption performance are strong candidates for practical applications in complex electromagnetic fields .
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 ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Leyi Zhang,Xiao Zhao,Yaling Ma,Yu Shu,Rao Zhang,Jianyong Xiang,Bochong Wang,Congpu Mu,Kun Zhai,Tianyu Xue,Fusheng Wen
In this study, the TBG composites (composites of tellurium doped black phosphorus nanoflakes (Te/BP NFs) with graphite nanoflakes (GNFs)) were successfully prepared which showed excellent electromagnetic wave absorption performance. The permittivity and dielectric loss tangent of TBG composites increased with the increase of GNFs content. When the ratio of Te/BP NFs to GNFs was 1:1 (TBG-1–1 composite), the reflection loss reached −10 dB under the thickness range of 1–3 mm and frequency range of 5.25–18 GHz, and the minimum reflection loss was −31.07 dB at the frequency of 4.14 GHz. Moreover, the relationship between minimum reflection loss frequency and thickness of TBG-1–1 composite conformed to the λ/4 impedance matching model. Therefore, the TBG composites have great potential in the application of high-frequency electromagnetic wave fields.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2023
·Vol. 20
·期 4
·2593-2602
·
IF 2.1
Guiqin You,Daoyang Han,Huijie Tian,Junfang Liang,Chang-An Wang,Keke Yuan,Jilin He,Mingliang Li,Hailong Wang,Rui Zhang,Gang Shao
Polymer-derived ceramic materials exhibit adjustable composition, microstructure, and dielectric properties and are widely used as high temperature microwave absorption materials in the aerospace field. In this study, polymer-derived SiCN ceramic aerogels with excellent electromagnetic wave absorption (EMA) properties were successfully fabricated through a combination of the sol-gel, freeze- drying, and polymer precursor conversion methods. The hydrosilylation reaction between the Si-H bond in polysilazane (a polymer ceramic precursor) and the C = C bond in divinylbenzene (a cross-linking agent) occurs to form a wet gel. The effects of the molar ratios of the two bonds (C = C/Si-H) on the microstructure and EMA properties of the SiCN ceramic aerogels were systematically studied. At a C = C/Si–H molar ratio of 1.25:1, the minimum reflection loss of the SiCN ceramic aerogels is −37.57 dB at 10.88 GHz. Moreover, the corresponding effective absorption bandwidth covers almost the entire X-band, showing excellent EMA properties.
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
International Journal of Applied Ceramic Technology
·
2022
·Vol. 20
·期 2
·1090-1102
·
IF 2.328
Fen Li,Hanzi Du,Ting Chen,Qikun Zhu,Zhaoju Yu
For the first time, the present work reports the dielectric properties and electromagnetic wave (EMW) absorbing performance of polymer-derived carbon-rich NbC-SiC-C nanocomposites. In our previous work, NbC-SiC-C nanocomposites with the ultra-high temperature ceramic phase NbC as the main phase were synthesized with the allylhydridopolycarbosilane (AHPCS) and niobium pentachloride (NbCl 5 ) as starting materials. On this basis, divinyl benzene was chosen as carbon-rich source and introduced into the AHPCS and NbCl 5 to form a single-source-precursor. Finally, carbon-rich NbC-SiC-C nanocomposites were successfully synthesized by polymer-derived ceramic approach. Compared with ceramic samples without Nb and with lower carbon content, the carbon-rich NbC-SiC-C nanocomposites show extremely enhanced EMW absorbing performance with minimum reflection coefficient of −51.1 dB at 6.88 GHz for the thickness of 2.27 mm. As a consequence, the resultant carbon-rich NbC-SiC-C nanocomposite has to be considered as structure&function integrated material with excellent EMW absorption performance, which can be applied in hostile environment.
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 Chemistry A
·
2023
·Vol. 11
·期 13
·6934-6944
·
IF 11.9
Yuxiao Yang,Jianyun Zhao,Jiuhong Wang,Yinhuan Li,Wei Yu,Shujiang Ding
Magnetic MXene-based composites have been extensively developed for highly effective electromagnetic (EM) wave absorption. However, previously reported studies neglected the influence of regulating primary dissipation sources and electron migration on absorption performance. This is probably due to the fact that the present modification methods frequently severely oxidize MXenes, obliterating the electron migration pathway. Here, a facile strategy is developed to create sandwich-like m-Ti3C2/Fe3O4 (MTF) composites by electrostatic assembly. The room temperature assembly process prevents oxidation and safeguards the in-plane electron migration path of m-Ti3C2. This makes it possible to reveal the mechanism by which increased Fe3O4 content inhibits electron migration, lowers attenuation capacity, and leads to increasing impedance-matching thickness. More importantly, we provide the first explanation of the absorption band transfer phenomenon. Additionally, at a thickness of 2.96 mm, the as-prepared MTF composites exhibit exceptional EM wave absorption capacity, reaching −77.5 dB with an effective absorption band of 3.0 GHz. The comprehensive insight presented in this work offers a solid theoretical foundation for an in-depth understanding of the influence of electron hopping behaviors on electromagnetic characteristics and, consequently, EM wave absorption performance, which further offers an essential roadmap to fabricate high-performance absorbers.
研究领域:
材料科学
·
电磁工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2022
·
IF 9.463
Limeng Song,Yongqiang Chen,Qiancheng Gao,Zhe Li,Xinyue Zhang,Hailong Wang,Li Guan,Zhaoju Yu,Rui Zhang,Bingbing Fan
With the rapid development of modern information technology, high-level electromagnetic wave (EMW) absorbing materials are playing an increasingly important role in military and civilian fields. However, current EMW absorbers usually have narrow absorption bandwidths and low absorption strengths , which hinder their practical applications. Herein, lightweight aerogels with low thermal conductivity and highly efficient EMW absorption were fabricated via a sol–gel method and subsequent carbothermal reduction with a simple chemical reaction process. The as-prepared graphene/SiC-nanosheets aerogels are composed of a large number of the interconnected two-dimensional SiC nanosheets and graphene sheets with abundant micrometer-sized pores that favored impedance matching, which endows the aerogels with outstanding EMW-absorbing performance. Conductive loss and interfacial polarization further promote the EMW-absorbing of the graphene/SiC-nanosheets aerogels. In addition, the highly porous and interconnected three-dimensional graphene/SiC-nanosheets aerogel networks not only facilitate the absorption of infiltrated EM waves via multiple reflection but also effectively reduce the number of heat transmission routes in the aerogels. The as-prepared SiC/G-2 aerogel exhibites excellent EMW-absorbing property, with a RL min of −65.08 dB at a frequency of 13.20 GHz, a thickness of 3.5 mm and an EAB of 2.21 GHz. These results demonstrate that the as-prepared graphene/SiC-nanosheets aerogel is fascinating material with possible applications in high-performance EMW-absorbing and heat-insulating in the aviation and aerospace fields.
研究领域:
材料科学
·
电磁工程
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Xueqing Xu,Feitian Ran,Hua Lai,Zhongjun Cheng,Tong Lv,Lu Shao,Yuyan Liu
Metal–organic framework (MOFs) derived magnetic nanoparticles/porous carbon (M/C) composites featuring efficient interfacial engineering and spatially continuous three-dimensional (3D) networks are desirable electromagnetic wave (EMW) absorbing materials due to multiple transmission path and well impedance matching. However, it is challenging to construct such 3D interconnected carbon networks from a single MOF precursor. Herein, FeNi3 and N embedded 3D carbon networks comprising bamboo-like carbon nanotubes connected carbon nanorods (FeNi@CNT/CNRs) were prepared via one-step pyrolyzing of the composite of melamine and FeNi-MIL-88B. Attributed to the synergistic contributions of 3D interconnected carbon nanotube networks and MOFs derived M/C for multiple transmission path, impedance matching, and dielectric loss (especially for multiple polarization and micro-current), the FeNi@CNT/CNRs nanoarchitectures have demonstrated superior EMW absorbing performance. In particular, the optimized FeNi@CNT/CNR-0.9 has exhibited strong absorption (−47.0 dB, 2.3 mm in thickness) and broadband effective absorption (4.5 GHz, 1.6 mm in thickness). This attractive strategy holds promise as a general approach to fabricate the carbon hybrid network constituted of MOFs derived nanopolyhedron and CNTs for the target application.
研究领域:
材料科学
·
纳米技术
·
电磁材料
·
复合材料
✓ 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）