JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Tiansheng Liu,Na Liu,Qingda An,Zuoyi Xiao,Shangru Zhai,Zhongcheng Li
The unique features of 2D layered structure, native defects and abundant functional groups provide special peculiarities for exploring Ti 3 C 2 T x MXenes in microwave absorption field. Nonetheless, both bad conductivity and poor impedance matching of Ti 3 C 2 T x MXenes lead to relatively poor EM absorption performance. Herein, by modifying Ti 3 C 2 T x MXenes with conductive PPy microspheres , a new core-shell like delaminated structure composites were fabricated for significant enhancement of absorption performance. It demonstrated that the obtained Ti 3 C 2 T x @PPy composites showed excellent microwave absorption performance due to synergistic effect between Ti 3 C 2 T x and PPy microspheres. The 10 wt% Ti 3 C 2 T x @PPy composites in wax matrix displayed a minimum reflection loss (RL) of −49.5 dB at 7.6 GHz with 3.6 mm in thickness, and the effective absorption bandwidth was 5.14 GHz from 6.44 to 11.58 GHz. The widest effective absorption bandwidth was 6.63 GHz from 8.55 to 15.18 GHz, the RL reached −42.6 dB in 12.4 GHz at only 2.7 mm matching thickness. More importantly, the composites can cover 4–18 GHz by simply adjusting matching thickness of 2–5.5 mm. The fantastic absorption performance could be ascribed to the unique properties of Ti 3 C 2 T x MXenes and heterojunction in Ti 3 C 2 T x @PPy, which might be a promising material in microwave absorption applied aspects.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Tengfei Wang,Qing Pang,Boyu Liu,Hongyu Wang
In recent years, molybdenum diselenide (MoSe2) nanomaterials have been proven to be promising electromagnetic wave (EMW) absorbers, attributed to the formation of a heterogeneous interface between the 2H semiconductor phase and the 1T metal phase during its preparation. However, the difficulty in precisely controlling the two-phase ratio and the complexity of the process hinder its further development. In this work, we constructed a simple phase engineering strategy based on the regulation of reducing agent concentration, achieving a regulation of the 1T phase proportion in defective 1T/2H-MoSe2 nanomaterials (ranging from 67.91 to 41.45%) by accurately adjusting the amount of NaBH4 added. The findings indicate that the material exhibits excellent microwave absorption performance when the 1T phase proportion reaches 53.55% (1T/2H-MoSe2-2), demonstrating a minimum reflection loss (RLmin) of −40.0 dB, and the effective absorption bandwidth (EAB) covers 6.08 GHz (11.92–18.0 GHz) when the thickness is 2.6 mm. The enhancement in performance results from a synergistic balance mechanism established by the abundant 1T-2H heterogeneous interface, which induces interfacial polarization loss, along with a moderately enhanced conductive loss in the 1T/2H-MoSe2-2 nanomaterial. Furthermore, radar cross-section (RCS) simulation results confirm the dramatic dissipation ability of absorbers for EMW in practical applications. This strategy paves the way for designs of interfaces and the control of the performance of absorbing nanomaterials based on transition-metal dichalcogenides (TMDs).
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 LETTERS
·
2021
·
IF 3.423
Chenguang Yang,Dale Xie,Sheng Wang
Herein, the palygorskite/polyaniline/ZnO (Pal/PANI/ZnO) nanocomposites were synthesized by using facile two-step solution method with palygorskite as a carrier. It was confirmed that the introduction of palygorskite can effectively prevent the free agglomeration of polyaniline shells and ZnO rods. Interestingly, the acquired ternary nanocomposites show excellent microwave absorption properties in multi frequency bands. Specifically, the optimized sample exhibits a minimum reflection loss (RL) value of −57.75 dB at 5.52 GHz in the C band, with an additional RL peak of −47.44 dB at 15.60 GHz at a thickness of merely 1.88 mm in the Ku band. Meanwhile, the effective absorption bandwidth (RL < - 10 dB) reaches 6.56 GHz in the range of 11.44–18.00 GHz at a thickness of 2.08 mm. Therefore, our results could contribute to the design of palygorskite based nanocomposites as the high-absorption and strong-bandwidth microwave absorbers.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 5
·2765-2774
·
IF 3.591
Sheng Wang,Wei Lian,Hengdong Ren,Jialin Ma,Yin Liu,Tianshu Zhang,Ling Bing Kong
It is a bold and highly novel attempt to disperse a conductive polymer with clay to enhance its microwave absorption performance. In this paper, we demonstrate that the introduction of palygorskite can effectively prevent polyaniline from aggregation and guide polyaniline on the nanorods of palygorskite. Interestingly, the obtained palygorskite/polyaniline (PAL/PANI) composites exhibit a cross-linked shell structure and the thickness of the polymer shell can be adjusted by controlling the content of palygorskite, which has a positive effect on the microwave absorption performance of the materials, due to improved impedance matching and increased attenuation constant. The optimized sample shows a reflection loss (RL) value of −57.40 dB at 11.04 GHz, at a thickness of 2.41 mm. Meanwhile, the effective absorption bandwidth reaches 5.20 GHz in the range of 11.84–17.04 GHz. It is believed that this achievement can be used as a reference for the design of composite materials as low-cost high-performance 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
Journal of Saudi Chemical Society
·
2016
·
IF 1.978
Bingzhen Li,Xiaodi Weng,Guojing Wu,Yang Zhang,Xuliang Lv,Guangxin Gu
Fe 3 O 4 /PPy/PANI (Fe 3 O 4 /polypyrrole/polyaniline) nanocomposites with excellent microwave absorbing properties have been successfully synthesized and characterized systematically. In detail, Fe 3 O 4 nanoparticles were prepared via an environmental friendly, modified co-precipitation method. Afterward, two conductive polymers, PPy and PANI, were deposited onto the surface of Fe 3 O 4 nanoparticles by in-situ polymerization of pyrrole and aniline. PPy and PANI was “glued” by the strong affinity between the carbonyl groups of PPy and the conjugated chains of PANI. The obtained Fe 3 O 4 /PPy/PANI nanocomposites have been found to possess excellent microwave absorbing property with the absorption bandwidth of 10.7 GHz (6.7–17.4 GHz) and maximum reflection loss at 10.1 GHz (−40.2 dB). It proves that the combination of ultra-small Fe 3 O 4 nanoparticles with two different conductive polymers have a great potential in the application of microwave absorbing 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 Nanomaterials
·
2015
·
IF 1.644
Qiufang Yao,Chunde Jin,Huanhuan Zheng,Zhongqing Ma,Qingfeng Sun
Magnetic NiFe2O4 nanoparticles were successfully deposited on the wood surface via a hydrothermal process at 70°C. The surface of the as-prepared magnetic NiFe2O4/wood hybrids (MWHs) was covered by spherical-like NiFe2O4 particles with an average size of 50 nm. MWH exhibited the thermostability, microwave absorbability, and superparamagnetism with saturation magnetization () of 1.79 emu·g−1. With further modification by 1H,1H,2H,2H-perfluorodecyltrimethoxysilane (FAS-17), MWH expressed superhydrophobic performances with a water contact angle of 158°. Its superparamagnetism stably remained under harsh conditions after chemical solutions corrosion and physical frozen test.
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
RSC Advances
·
2017
·Vol. 7
·期 58
·36473-36481
·
IF 3.108
Lujun Yu,Yaofeng Zhu,Yaqin Fu
A rational structure design is always an attractive approach for high-performance microwave absorbers. Accordingly, flexible BaTiO3@Ni–P/polyvinylidene fluoride/polyaniline (BaTiO3@Ni–P/PVDF/PANI) composite films were fabricated by growing aligned PANI on the surface of a BaTiO3@Ni–P/PVDF composite film. Morphology and structure characterization showed that uniform core–shell BaTiO3@Ni–P microspheres and the unique conelike shapes of aligned PANI were innovatively fabricated. The effect of the special structure on microwave absorption properties was investigated within the 2–18 GHz frequency range. The prepared absorbents displayed exceptional microwave absorption performances. The minimum reflection of BaTiO3@Ni–P/PVDF/PANI reached −22.56 dB at 12.72 GHz with a thickness of 2 mm, and the bandwidth that corresponded to reflection loss below −10 dB reached 4.33 GHz (11.12–15.45 GHz). The possible absorption mechanism of BaTiO3@Ni–P/PVDF/PANI was also studied in detail. Results offer an effective means to develop microwave absorbers via rational microstructure design.
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
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2017
·
IF 4.075
Yiwei Zheng,Xiaoxia Wang,Shuang Wei,Baoqin Zhang,Mingxun Yu,Wei Zhao,Jingquan Liu
Graphene is a promising lightweight microwave absorption (MA) absorber, but the limited dielectric loss and nonmagnetic characteristic have impeded its further applications. Through the structure modification, porous (1–2.5 μm) graphene was successfully prepared via a simple pyrolysis process, and the minimum reflection loss (RL) value reached −48 dB at 9.8 GHz, which demonstrated that porous graphene (PG) showed outstanding MA performance than the ordinary graphene (OG). In order to strengthen the magnetic loss, and then boost the impedance matching, Fe 3 O 4 nanoparticles (∼10 nm) were deposited uniformly on the surface of PG via in situ precipitation to synthesize porous graphene-Fe 3 O 4 (PG-Fe 3 O 4 ) composites. It was found that the as-prepared PG-Fe 3 O 4 composites showed especially high MA performance, and the minimum RL of −53.0 dB was achieved at 5.4 GHz with the thickness of 6.1 mm. The absorption bandwidth of RL less than −10 dB was from 12.6 to 18.0 GHz (5.4 GHz) with a thin thickness of 2.7 mm. The excellent MA properties of PG-Fe 3 O 4 composites were the consequence of the perfect impedance matching, porous structure as well as the multi-polarization. These results demonstrated that the PG-Fe 3 O 4 composites with excellent MA properties and lightweight should be promising absorbers for practical 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
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2016
·Vol. 122
·期 3
·1-6
·
IF 1.444
Yan Shaojiu,Wang Lina,Wang Tihong,Zhang Liqiang,Li Yongfeng,Dai Shenglong
We report a simple procedure to fabricate graphene oxide/carbon nanotube hybrids coated with cauliflower-like Fe 3 O 4 sphere. Characterizations have been carried out to investigate the morphology, crystalline structure of the composites by scanning electron microscopy, transmission electron microscopy and X-ray diffraction. Fe 3 O 4 particles have the morphologies of multi-lacuna; moreover, some spheres are hollow. As a kind of potential microwave absorption material, the composites are lightweight and exhibit excellent microwave absorbing ability in the range of 2–16 GHz.
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 MAGNETISM AND MAGNETIC MATERIALS
·
2022
·
IF 3.097
Ximing Zhang,Yin Liu,Zhenying Liu,Yanfen Wang,Yueqing Wang,Ling Bing Kong
Ni x Zn (1-x) Fe 2 O 4 (x = 0.4, 0.6, 0.7, 1) nanocrystalline powders were synthesized by using a modified spraying-coprecipitation method. The spraying-coprecipitated precursors of Ni x Zn (1-x) Fe 2 O 4 were heated to form ferrites with different particle sizes. The particle size of the Ni x Zn (1-x) Fe 2 O 4 powders gradually decreased with increasing content of Ni. Due to small size effect and orientation polarization, the sample Ni 0.7 Zn 0.3 Fe 2 O 4 exhibited an RL min of −64.37 dB at 6.48 GHz, as the thickness was 5.91 mm. Meanwhile, it had an effective absorption frequency range of 3.6 – 7.44 GHz and a bandwidth of 3.84 GHz, covering almost the C-band. Therefore, the Ni x Zn (1-x) Fe 2 O 4 powders synthesized in this way are promising microwave absorbing 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
ACS Nano
·
2021
·
IF 15.881
Caiyue Wen,Xiao Li,Ruixuan Zhang,Chunyang Xu,Wenbin You,Zhengwang Liu,Biao Zhao,Renchao Che
Two-dimensional materials, especially the newly emerging MXene, have attracted numerous interests in the fields of energy conversion/storage and electromagnetic shielding/absorption. However, the inherently inevitable aggregation and absence of magnetic loss of MXene considerably limit its electromagnetic absorption application. The introduction of magnetic component and favorable structural engineering are the alternatives to improve the microwave absorption (MA) performance. Herein, we report a spheroidization strategy to assemble double-shell MXene@Ni microspheres, where the commonly lamellar MXene are reshaped into three-dimensional microspheres that provide the substrate for oriented growth of Ni nanospikes. Whereas this structural feature offers massive accessible active surfaces that effectively promote the dielectric loss ability, the introduction of magnetic Ni nanospikes enables the additional magnetic loss capacity. Benefiting from these merits, the synthesized 3D MXene@Ni microspheres exhibit superior MA performance with the minimum reflection loss value of −59.6 dB at an ultrathin thickness (∼1.5 mm) and effective absorption bandwidth of 4.48 GHz. Moreover, the electron holography results reveal that the high-density anisotropy magnetism plays an important role in the improvement of MA performance, which provides an insight for the design of MXene-based materials as high-efficient 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
Nanomaterials
·
2023
·Vol. 13
·期 12
·1836
·
IF 5.3
Xiaomei Zhang,Baitong Zhou,Xiang Li,Runhua Chen,Chen Ma,Wenhua Chen,Guohua Chen
Microwave-absorbing materials have attracted extensive attention due to the development of electronic countermeasures. In this study, novel nanocomposites with core–shell structures based on the core of Fe-Co nanocrystals and the shell of furan methylamine (FMA)-modified anthracite coal (Coal-F) were designed and fabricated. The Diels-Alder (D-A) reaction of Coal-F with FMA creates a large amount of aromatic lamellar structure. After the high-temperature treatment, the modified anthracite with a high degree of graphitization showed an excellent dielectric loss, and the addition of Fe and Co effectively enhanced the magnetic loss of the obtained nanocomposites. In addition, the obtained micro-morphologies proved the core–shell structure, which plays a significant role in strengthening the interface polarization. As a result, the combined effect of the multiple loss mechanism promoted a remarkable improvement in the absorption of incident electromagnetic waves. The carbonization temperatures were specifically studied through a setting control experiment, and 1200 °C was proved to be the optimum parameter to obtain the best dielectric loss and magnetic loss of the sample. The detecting results show that the 10 wt.% CFC-1200/paraffin wax sample with a thickness of 5 mm achieves a minimum reflection loss of −41.6 dB at a frequency of 6.25 GHz, indicating an excellent microwave absorption performance.Keywords:anthracite coal;Diels-Alder reaction;microwave absorbing performance;core–shell structure
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
危险品化学品经营许可证（带存储）