CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Guoqing Wang,Pengxing Cui,Gang Qin,Longfei Jiang,Fengjun Zhang,Xiaobing Zhou
In this study, a purity of up to 98.36 wt. % GdB 6 with screw dislocation growth morphology were successfully fabricated using an in-situ reaction approach. The terraced-like structure of the GdB 6 enhanced the interfacial polarization and multiple interface scattering of the electromagnetic waves. As a result, the as-obtained high purity GdB 6 powder presented superior electromagnetic wave absorption performance. The minimum reflection loss value can be −49.24 dB at the frequency of 13.12 GHz with a thin matching thickness of 1.44 mm. In addition, the widest effective absorption bandwidth can be up to ∼4 GHz (14–18 GHz) with a thin matching thickness of 1.25 mm. The remarkable electromagnetic wave absorption performance of GdB 6 ceramics could be attributed to conductance loss and polarization loss enhanced by the screw dislocation growth defects, as well as synergistic effects with magnetic loss. The as-obtained GdB 6 with synergistic dielectric loss and magnetic loss is to be a novel single-phase with excellent electromagnetic wave absorbing material, which will pave the way on the investigation of rare earth hexaborides for the ultra-high temperature environment applications.
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
·
2016
·
IF 3.014
Mingtao Qiao,Xingfeng Lei,Yong Ma,Lidong Tian,Wenbin Wang,Kehe Su,Qiuyu Zhang
Functional composite microspheres with porous Fe 3 O 4 cores and hierarchical MnO 2 shells have been synthesized successfully via a two-step hydrothermal method . X-ray diffraction was employed to determine the crystal forms of samples. The morphologies and microstructures of Fe 3 O 4 nanoparticles and Fe 3 O 4 @MnO 2 composite microspheres were observed by the scanning electron microscope and transmission electron microscope. It can be seen that hierarchically structured MnO 2 shells have coated Fe 3 O 4 nanoparticles, and the shell thickness is about 140–160 nm. The BET specific surface area and porosity were estimated by the N 2 absorption-desorption isotherms and the magnetic properties were measured by the vibrating sample magnetometer . As-synthesized Fe 3 O 4 @MnO 2 composite microspheres have a BET specific surface area of 167 m 2 /g, and the pore width is mainly distributed in the mesoporous range, especially from 2.0 nm to 12.0 nm. Investigations of microwave absorbing properties manifest that Fe 3 O 4 @MnO 2 composite microspheres with loading 10% weight fraction possess the strongest RL peak of −42.6 dB (5.7 GHz) at the matching thickness 4.0 mm, and Fe 3 O 4 @MnO 2 composite microspheres with loading 20% weight fraction have a broader absorbing bandwidth (10.2–15.0 GHz and 15.5–17.3 GHz) at the matching thickness 1.5 mm. Achieving the advantages of intensive absorption, wide effective absorbing bandwidth band and intrinsic lightweight feature, porous core-shell Fe 3 O 4 @MnO 2 composite microspheres are believed to be more promising in the application of microwave absorption.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2022
·
IF 3.806
Jing Yue,Jiaqi Yu,Shaohua Jiang,Yiming Chen
Nowadays, high-performance electromagnetic wave (EMW) absorption materials derived from low-cost biomass materials have attracted widespread attention. Herein, a novel biomass‑carbon with porous array structures derived from waste soybean dregs is prepared by a hydrothermal method combined with heat treatment using formaldehyde and KOH as activators. The as-prepared biomass‑carbon with significantly enhanced specific surface area can possess more charge transmission paths, increased multiple reflections and scattering, multiple loss modes, and improved impedance matching, leading to the improvement of EMW absorption performances . The obtained single-component biomass‑carbon without any functional fillers exhibits an effective EMW absorption capability with a wide absorption bandwidth of 4.8 GHz at a thickness of 3.5 mm. This study will provide a valuable approach for the preparation of biomass‑carbon based EMW absorption materials with controllable porous structures by the activation process .
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2022
·
IF 4.969
Ximing Zhang,Guiyang Xian,Jingyu Wang,Yang Fan,Yin Liu,Won-chun Oh,Zhenying Liu,Yueqin Wang,Ling Bing Kong
FeCo@C with a hollow porous dodecahedron structure was obtained through carbonization of ZIF-67 etched with Fe 3+ . During the pyrolysis process, the organic skeleton of the ZIF-67 was carbonized, forming graphitic carbon and carbon nanotubes. The etching effect of Fe 3+ with different concentrations on the morphology of ZIF-67 is studied. The MOF-derived porous carbon bimetallic nanocomposites exhibited stronger electromagnetic wave absorption performance than the monometallic ones. Specifically, the optimized sample has a reflection loss of −70.69 dB at 11.28 GHz, as the thickness is 2.07 mm. The enhanced electromagnetic wave (EMW) absorption performance of the nanocomposites can be attributed to the multiple interfaces and capacitive structure formed by catalytically produced carbon nanotubes. This achievement could be used as a reference for the development of MOF-derived porous carbon nanocomposite EMW absorbers.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Deqing Zhang,Honghan Wang,Junye Cheng,Changyu Han,Xiuying Yang,Jingyu Xu,Guangcun Shan,Guangping Zheng,Maosheng Cao
Herein, ultra-thin tungsten disulfide nanosheets/carbon nanotubes (WS 2 -NS/CNTs) hybrids were successfully synthesized by using a one-step hydrothermal method. The WS 2 -NS is evenly grown on the surfaces of CNTs , leading to a remarkable three-dimensional (3D) heterostructure. Outstanding electromagnetic wave absorption performance of the WS 2 -NS/CNTs hybrids can be achieved by tuning the amount of CNTs. The minimum reflection loss can reach up to −51.6 dB at 14.8 GHz, and the effective absorption bandwidth is 5.4 GHz for the hybrids with a thickness of 1.95 mm. Comparison of the results with those of simple mixtures of WS 2 -NS and CNTs prepared by using ultrasonic methods indicates that the absorption performance of the optimized WS 2 -NS/CNTs hybrids are closely related to that of the 3D mesh conductive network constructed by the addition of CNTs and the synergistic effect of WS 2 -NS and CNTs in the hybrids. These WS 2 -NS/CNTs hybrids open a new avenue for the development of electromagnetic wave absorbers with extraordinary absorption performance, light weight, small thickness, broad absorption bandwidth, and low cost.
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 Advanced Ceramics
·
2021
·Vol. 10
·期 4
·832-842
·
IF 6.707
Du Bin,Cai Mei,Wang Xuan,Qian Junjie,He Chao,Shui Anze
Nowadays, metal oxide-based electromagnetic wave absorbing materials have aroused widely attentions in the application of telecommunication and electronics due to their selectable mechanical and outstanding dielectric properties. Herein, the binary ZnO/NiCo 2 O 4 nanoparticles were successfully synthesized via hydrothermal reaction and the electromagnetic wave absorption properties of the composites were investigated in detail. As a result, benefiting from the dielectric loss, the as-obtained ZnO/NiCo 2 O 4 -7 samples possessed a minimum reflection loss value of −33.49 dB at 18.0 GHz with the thickness of 4.99 mm. This work indicates that ZnO/NiCo 2 O 4 composites have the promising candidate applications in electromagnetic wave absorption materials in the future.
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
Materials Today Physics
·
2023
·
IF 11.5
Lele Xiang,Xiaosi Qi,Yongchao Rao,Lei Wang,Xiu Gong,Yanli Chen,Qiong Peng,Wei Zhong
Constructing the multicomponent composites with more tunable structure parameters is conducive to optimize the electromagnetic (EM) properties, which is an effective way to develop high-efficient microwave absorbers (MAs). Herein, heterostructured lightweight carbon paper (CP)/Co nanoparticles composites were elaborately designed and produced through a simple high temperature annealing process . By controlling the annealed temperature, the as-prepared CP/Co heterostructures with different contents of CP could be obtained, which resulted in the tunable EM and EM wave absorption properties (EMWAPs). The obtained results revealed that the enhanced content of CP effectively boosted their conduction loss and polarization loss abilities. And the as-prepared CP/Co heterostructures displayed the outstanding comprehensive EMWAPs including strong absorption capability, broad frequency bandwidth and thin matching thickness. Furthermore, the EMWAPs of obtained CP/Co samples could be further improved by optimizing the concentration of Co sources. Especially, the as-prepared CP/Co3-750 sample displayed a minimum reflection loss value of −70.23 dB with a matching thickness ( d m ) value of 2.26 mm, and an effective absorption bandwidth of 4.80 GHz with the d m value of 1.74 mm, respectively. Therefore, our findings not only presented a simple and viable route to produce magnetic CP-based heterostructures, but also provided an effective strategy to develop the lightweight, tunable and broadband high-efficiency MAs.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
Materials Research Express
·
2020
·Vol. 6
·期 12
·125621
·
IF 1.929
Haopeng Cai,Bo Cheng,Hongbo Xiao,Qinqin Wei
A novel rGO/p-Fe3O4@PANI three-phase nanomaterial was prepared by coating conductive polyaniline (PANI) on reduced graphene oxide (rGO) and porous Fe3O4 (p-Fe3O4), which can increase the reflection interface of electromagnetic waves and extend the reflection path of electromagnetic waves propagating inside the material, and between them. Three kinds of rGO/p-Fe3O4@PANI samples were prepared. The mass percentage of PANI in the samples was established. The mass ratio of rGO to p-Fe3O4 was changed to ameliorate the impedance matching and attenuation constant. Compared with rGO/p-Fe3O4, rGO/p-Fe3O4@PANI exhibits excellent electromagnetic wave absorption performance. When the mass ratio of rGO to p-Fe3O4 in the 40 wt% three-phase material is 1:5 and the thickness is 2.5 mm, the minimum RL of rGO/p-Fe3O4@PANI is −41.38 dB at 9.75 GHz and the effective absorption bandwidth to electromagnetic wave reaches 3.08 GHz (from 8.40 to 11.48 GHz), indicating that is a potentially attractive candidate for high efficiency electromagnetic wave absorbers. The combination of the conductive polymer, porous magnetic nanoparticles and rGO improves the impedance matching condition to some extent, and effectively increases the attenuation constant of the material.
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
·
2022
·
IF 9.965
Abdou Karim Darboe,Xiaosi Qi,Xiu Gong,Qiong Peng,Yanli Chen,Ren Xie,Wei Zhong,Guanglei Wu
Interfacial polarization and geometrical morphology play a significant role in the attenuation of electromagnetic (EM) wave. Herein, the two-dimensional (2D)/2D heterojunction with flower-like geometrical morphology is proposed and produced, which may simultaneously provide a large contact area for achieving strong interfacial polarization and activates more sites for the possible multiple EM wave reflection and scattering. By adopting a simple two-step hydrothermal method, MoSe 2 /MoS 2 and MoS 2 /MoSe 2 inner and outer-interchangeable heterojunctions consisting of 2D MoSe 2 and MoS 2 nanosheets with flower-like geometrical morphology were successfully synthesized. The results revealed that the hydrothermal temperatures significantly impacted the flower-like geometrical morphology and MoS 2 content. By optimizing the microstructures, the designed MoSe 2 /MoS 2 and MoS 2 /MoSe 2 heterojunctions presented enhanced comprehensive EM wave absorption properties (EMWAPs), possessing strong absorption capability, wide absorption bandwidth and thin matching thicknesses. Generally, this work demonstrates that the optimized EMWAPs of designed heterojunctions mainly originate from the special interfaces and morphology configuration, which also paves a new way for the designing and synthesis of transition metal dichalcogenides-based heterojunction as a novel and desirable candidate for high-performance microwave absorbers.
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
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Fangyu Gan,Yongle Jiang,Qingrong Yao,Jianqiu Deng,Lichun Cheng,Yan Zhong,Zhao Lu,Jiang Wang,Qianxin Long,Huaiying Zhou,Guanghui Rao
Functional core-shell heterostructure, which can integrate the characteristics of multiple components to achieve synergistic effects, have been widely explored in electromagnetic wave (EMW) absorption materials. In this work, core-shell ZnO@ZnO/FeNi microrods (MRs) derived from ZnO@ZnFeNi hydroxide (ZnFeNi OH) are prepared by a simple hydrothermal reaction and subsequent pyrolysis process. The introduction of FeNi alloy helps to optimize the impedance matching of ZnO, thus improving the EMW absorption performance. The different impedance matching properties of core-shell ZnO@ZnO/FeNi MRs are realized by adjusting the ZnO/FeNi shell thickness by changing the hydrothermal reaction time. When the hydrothermal time is 10 h, the core-shell ZnO@ZnO/FeNi MRs supplies the optimal EMW absorption performance with the minimum reflection loss of −53.7 dB and the widest absorption bandwidth of 5.3 GHz at a filler content of 33%. The synergistic effect of ZnO–FeNi interfacial polarization and the strong dielectric-magnetic loss are responsible for its superior EMW absorption performance. This work provides a valuable strategy for constructing core-shell dielectric@ magnetic composites to obtained high efficiency absorber.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
Materials Today Physics
·
2024
·
IF 10
Xiaoke Fang,Yi Zhang,Kaixiang Pang,Yuanhui Wang,Tingting Hu,Wei Zhang,Chunhong Gong,Jingwei Zhang
Although graphene nanosheets (GNs) with huge specific surface area and exceptional electrical properties exhibit attractive practical prospect in the realm of electromagnetic function materials, how to optimize the distribution states of GNs in matrix is still a challenge. In this work, the suspension of GNs was prepared directly via an efficient liquid-phase exfoliation (LPE) process in N-octyl-2-pyrrolidone (NOP). Thanks to the dissolution of polyether sulfone (PES) in NMP and NOP solvent, the GNs/PES composites were in-situ prepared via a facile solution blending in combination with evaporation process. The “function units” of the mesoscopic micro-cluster structure assembled by GNs during the solvent evaporation process contribute to optimized impedance matching characteristics and loss capabilities as well as excellent electromagnetic wave (EMW) absorbing performance of the as-constructed GNs/PES electromagnetic composites. Particularly, the as-prepared sample G-P-9 with a graphene content of as low as 9.0 wt% exhibits outstanding EMW absorbing performance in the whole ranges of tested frequency (8.2–12.4 GHz) and temperature (293–453 K) with a minimum reflection loss (RL) of −52.7 dB. Besides, the in-situ self-assemble GNs/single-walled carbon nanotubes (GNs/SWCNT) film with pre-constructed three-dimensional interpenetrating conductive network exhibits excellent electromagnetic interference (EMI) shielding effectiveness (SE) of about 5.1 × 10 4 dB cm 2 g −1 . The present approach would be applicable to construct high-performance electromagnetic functional materials and broaden the application prospect of high-integrity graphene nanosheets .
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
CARBON
·
2021
·
IF 9.594
Jun Liao,Mingquan Ye,Aijun Han,Jianming Guo,Qingzhong Liu,Gaoqiang Yu
Electromagnetic (EM) wave absorber with the characteristics of thin thickness, strong absorption capacity and broad absorption bandwidth is desirable to address the EM radiation. In this work, the flower-like Cu 9 S 5 /RGO (CSR) composites were synthesized via a solvothermal method. Various kinds of characterizations were utilized to certify the successful preparation and properties of CSR composites. To explore the EM wave absorption performance of the CSR composites, we measured the EM parameters and calculated the reflection loss (RL) values of all the samples. Owing to the comprehensive effect of well impedance matching and large attenuation constant , the CSR-2 sample exhibited the minimum RL value of −51.9 dB at the thickness of 2.8 mm, and the widest effective absorption bandwidth (EAB) is 3.92 GHz in 1.5 mm. Furthermore, the absorption mechanisms were revealed, the impressive EM wave absorption performance of the CSR-2 is inseparable from the conductive loss and polarization relaxation, as well as the slight magnetic loss. We consider that the CSR composite can be a promising candidate for efficient and superior EM wave absorption absorber.
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）