APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Deqing Zhang,Yingfei Xiong,Junye Cheng,Hassan Raza,Chuanxu Hou,Tingting Liu,Xuewei Ba,Ping Zhang,Maosheng Cao
As a novel 2D transition metal sulfide material, WS 2 has been proven to possess potential electromagnetic wave absorption (EMWA) property due to its peculiar electronic structure. However, the intrinsic weak impedance match and single dielectric loss domination of this material only produce high-frequency electromagnetic absorption (EMA), which is seemingly futile for the prevalent low-band 4G and 5G EMW. In this study, efforts have been made to effectively texture rod-like TiO 2 semiconductor with different mass ratios on the a few layers of WS 2 nanosheets via a simple step-by-step hydrothermal method. It is found that the WS 2 /TiO 2 hybrids loaded with 10% TiO 2 at a sample thickness of 5.30 mm, the minimum RL is −43.90 dB at 5.12 GHz. When the thickness of the sample is 2.00 mm, the bandwidth with RL value less than −10 dB can reach 4.70 GHz, and the effective EMA band could be adjusted in a range of 13.84 GHz (4.16–18 GHz) by increasing the thickness from 1.0 mm to 5.5 mm. It was found that the introduction of TiO 2 nanosheets with high dielectric loss into the dielectric WS 2 nanosheets can produce a synergistic effect. The benefits of such synergestic effect include, optimization of the EMA strength and bandwidth, and a reduction of the effective EMA frequency band from high frequency to low frequency. This study paves a new avenue for the future design of low-frequency EMA materials with high efficiency.
研究领域:
材料科学
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
Coatings
·
2024
·Vol. 14
·期 5
·631
·
IF 2.9
Leiyu Du,Renxin Xu,Yunfa Si,Wei Zhao,Hongyi Luo,Wei Jin,Dan Liu
Developing microwave absorbers with superior low-frequency electromagnetic wave absorption properties is one of the foremost important factors driving the boom in 5G technology development. In this study, via a simple hydrothermal and pyrolysis strategy, randomly interleaved CoNiO2nanosheets and uniformly ultrafine CoNi nanocrystals are anchored onto both sides of a single-layered MXene. The absorption mechanism demonstrated that the hierarchical heterostructure prevents the aggregation of MXene nanoflakes and magnetic crystallites. In addition, the introduction of the double-magnetic phase of CoNiO2/CoNi arrays can not only enhance the magnetic loss capacity but also generate larger void spaces and abundant heterogeneous interfaces, collectively promoting impedance-matching and furthering microwave attenuation capabilities at a low frequency. Hence, the reflection loss of the optimal absorber (M–MCNO) is −45.33 dB at 3.24 GHz, which corresponds to a matching thickness of 5.0 mm. Moreover, its EAB can entirely cover the S-band and C-band by tailoring the matching thickness from 2 to 7 mm. Satellite radar cross-section (RCS) simulations demonstrated that the M–MCNO can reduce the RCS value to below −10 dB m2over a multi-angle range. Thus, the proposed hybrid absorber is of great significance for the development of magnetized MXene composites with superior low-frequency microwave absorption properties.
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
Chuanxu Hou,Junye Cheng,Huibin Zhang,Ziheng Lu,Xiuying Yang,Guangping Zheng,Deqing Zhang,Maosheng Cao
With the continuous advances in detection and early-warning technologies, stealth technologies have widely integrated in modern combat systems and armament research. The development of high-performance electromagnetic wave absorbing materials is important for electromagnetic stealth and shielding applications. Herein, biomass-derived carbon (BDC) from glucose is coated on the surface of folded and stacked WS 2 nanosheets, forming WS 2 @BDC via a simple hydrothermal method and subsequent annealing carbonization. The amount of the BDC coating on the WS 2 nanosheets is effectively controlled by the glucose solution concentration, and the electromagnetic wave (EMW) absorption performance in the low-frequency bands can be adjusted by the regulation of annealing temperature. The effective absorption band of WS 2 @BDC is shifted to a lower frequency region and the absorption performance is substantially enhanced, compared to those of pure WS 2 nanosheets. The minimum reflection loss of WS 2 @BDC corresponding to 14 mL of glucose and a carbonization temperature of 800 °C can reach up to −51.40 dB at 5.52 GHz. The study provides a novel and facile method for improving the EMW absorption performance of WS 2 in the low-frequency bands.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
ACS Applied Electronic Materials
·
2025
·
IF 4.7
Renxin Xu,Hongyi Luo,Zhengyi Li,Yahan Gao,Wei Zhao,Xiao Li,Wei Jin,Dan Liu
Poor microwave-absorbing performance of a carbonaceous–magnetic hybrid at low frequency is one of the great challenges that needs to be solved urgently. Constructing a three-dimensional structure of a graphene-based absorber with high-loading ferrite nanoparticles onto graphene surfaces is an effective strategy to boost the low-frequency absorbability. Therefore, we constructed substrates of crumpled monolayer graphene oxide spheres by first spray-drying and synthesized high-loading iron hydroxide nanograins onto the substrates by a simple oil-bath heating. Followed by an annealing treatment under Ar gas, an ultrahigh Fe3O4 magnetic crystals loading onto crumpled spherical reduced graphene oxide hybrid (Fe3O4@crGO) was obtained. The wrinkled architecture provides a large number of interface angles for ultrahigh Fe3O4 nanocrystals to avoid the massive agglomeration, which lowers the complex permittivity and improves the complex permeability to perfect absorber’s impedance matching at low frequency. Meanwhile, the impressive conducting loss of rGO, magnetic loss of Fe3O4 nanograins, polarization loss of heterogeneous interfaces, and multiple reflection and scattering of microwaves within the three-dimensional architecture boost the attenuation capability of the absorber. As a result, the as-prepared Fe3O4@crGO-30 hybrid exhibits a superb reflection loss of −52.3 dB at 5.4 GHz. In addition, by tailoring the thickness ranging from 2.5 to 5.0 mm, full coverage absorption in C and X bands can be achieved. This work provides a simple, efficient, and promising way to prepare a graphene-based absorber with perfect low- and middle-frequency absorption capacity.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Cuiqing Zhou,Mushan Yuan,Xiaochuang Di,Shaoyu Qiu,Mei Liang,Yinfu Luo,Huawei Zou
With the rapid advancement of communication technology, electromagnetic pollution has become a critical issue, driving the demand for lightweight, broadband, and efficient electromagnetic wave (EMW) absorption materials. However, achieving effective low-frequency EMW absorption remains challenging due to the trade-off between attenuation capability and impedance matching. Here, we report a novel MoS 2 /CNT carbon foam (MC@CF) derived from pyrolyzed polyimide composite foam integrated with hydrothermally synthesized MoS 2 /CNT. By precisely controlling the 1T-phase content and leveraging the 3D interconnected porous architecture and heterogeneous interfaces, improved impedance matching and enhanced EMW dissipation are achieved. The MC@CF demonstrates exceptional low-frequency absorption, with a minimum reflection loss (RL min ) of −65.6 dB in the C band and −49.4 dB at 2.25 GHz in the S band. Additionally, the foam exhibits a remarkable radar cross-section (RCS) reduction of 26.1 dB·m 2 , high compressive strength (1.45 MPa), and superior thermal insulation, making it promising for extreme 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
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Jian Wu,Ying Zhang,Min Luo,Bing Lu,Yan Yang,Kai Sun,Daming Chen,Yingli Liu,Jie Li
Co 2 Z ferrite with superior performance is a beneficial material for high filter devices and antenna substrates. In this work, Ba 3 Co 2 Fe 24-x Sm x O 41 ( x = 0.00–0.50 with a step of 0.10) materials were prepared using low temperature-fired process with 2.5 wt% of Bi 2 O 3 . The phase formation, microstructure, magnetic property , complex permittivity, and complex permeability were studied using X-ray diffraction, scanning electron microscopy, vibrating sample magnetometer , and vector network analyzer. The materials remained in a single hexagonal phase, and the grain size increased with increase of Sm-doped content. Saturation magnetization of samples increased at first and then decreased. When x = 0.20 and 0.30, the value of 4π M S was 2910.4 G and 2861.7 G, respectively. The variation of saturation magnetization is mainly due to the occupancy of Sm 3+ ions. When Sm 3+ ion doped Fe 3+ ion of Co 2 Z ferrite, Sm 3+ ion first preferred to occupy 4e IV site due to its low electronegativity, and then occupied 12k and 4f sites at high doped content, affecting magnetic moment and magneto-crystalline anisotropy. Furthermore, low-temperature sintering improves magnetic-dielectric properties of Sm-doped materials in high-frequency range. The real part of magnetic permeability (μ′) reached a maximum value of 8.4 when x = 0.20 and the real part of dielectric permittivity (ε′) reached a maximum value of 14.1 when x = 0.30. The magnetic loss and dielectric loss remained low (tanδ μ = 0.05–0.08 and tanδ ε = 0.005–0.04) and the off-cut frequency was nearly 1 GHz. The results indicated that these magnetic-dielectric materials have great potential for high-frequency antenna applications.
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
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 8
·2897-2910
·
IF 6.4
Mei Wu,Hongchang Wang,Xiaohui Liang,Dunhui Wang
In this work, we designed the flower-like structure of 1T/2H-MoS2@α-Fe2O3 nanocomposites with high-efficiency microwave absorption, in which the α-Fe2O3 microdrums are attached to the surface of 1T/2H-MoS2 constituting a special flower-like morphology. During the synthesis process, the content of α-Fe2O3 microdrums plays a significant, constructive role in the dielectric properties and impedance matching characteristics of the 1T/2H-MoS2@α-Fe2O3 nanocomposites. The optimal reflection loss (RL) value of the flower-like nanocomposites can reach −61.18 dB at low frequency (6.52 GHz), while the RL value is also −56.98 dB at 4.43 GHz with a lower frequency. Furthermore, the frequency bandwidth below −10 dB was up to 4.68 GHz with an effective absorption frequency range of 13.32–18 GHz when the thickness was 1.82 mm. The results show that excellent electromagnetic wave absorption capabilities of the 1T/2H-MoS2@α-Fe2O3 nanocomposites in the low frequency range mainly benefit from the perfect coordination of multiphase MoS2 and α-Fe2O3 microdrums, which makes them achieve perfect impedance matching in the low frequency range. This provides a simple demonstration for the development of highly efficient electromagnetic wave absorption materials in the low frequency range.
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 AMERICAN CERAMIC SOCIETY
·
2025
·
IF 3.8
Gaofeng Shao,Yu Sun,Gaoyuan Yu,Weiquan Huang,Liqun Guo,Xiaogu Huang
Polymer-derived ceramics (PDCs), known for their exceptional thermal stability and adjustable dielectric characteristics, show great promise in electromagnetic wave absorption applications under extreme temperature conditions. Their multiphase and multi-heterointerface structures also enable effective low-frequency absorption for 5G applications, a crucial yet underexplored capability. In this study, nickel-modified SiCN (SiCN/Ni) ceramics were synthesized through coordination crosslinking of trace amounts of nickel-based metal-organic framework (Ni-MOF) with polysilazane precursor, followed by high-temperature pyrolysis. The investigation reveals that Ni-MOF enables the formation of both dielectric and magnetic loss components, specifically SiC nanocrystals, free carbon, and Ni 2 Si nanocrystals, during the synthesis process at reduced temperature conditions. The coexistence of electromagnetic-transparent and absorbing phases enhances impedance matching. The heterogeneous nanodomains create multiple interfaces, induce significant lattice strain, and produce abundant structural defects, which together enhance interfacial and dipole polarization effects. Notably, the optimized SiCN/Ni ceramic exhibits exceptional microwave absorption performance at low frequency, achieving a minimum reflection loss of –46.1 dB at 5.28 GHz. The low-frequency absorption bandwidths reach 0.76 and 1.0 GHz at thicknesses of 4.0 and 5.0 mm, fully covering both the n 78 band (3.3–3.8 GHz) and n 79 band (4.4–5.0 GHz) used in 5G communications. These findings present new opportunities for developing advanced lower-frequency absorbers based on dielectric PDCs.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Xueying Zhao,Mang Li,Xiaohui Sun,Xuyang Zhang,Zhishuai Wang,Zhaodi Lu,Xiangwei Wang,Guohua Wu
The distinctive physical and chemical characteristics of organic-inorganic lead halide perovskite make it a promising candidate for microwave absorption applications. However, the high-efficiency microwave absorption of halide perovskite-based composites is concentrated at high frequencies, while electronic equipment operates at low-frequency bands. Exploring simple and efficient methods to achieve optimal microwave absorption efficiency at low frequencies continues to pose a considerable challenge. Here, FAPbI 3 was synthesized by a simple solvent-free hand grinding method and mixed with carbon nanotubes (CNTs) to obtain a series of FAPbI 3 /CNTs (FC) composites. By modulating the mass ratio of the components, FAPbI 3 modulates the absorption bands, CNTs can effectively establish a conductive network to enhance both polarization loss and conductive loss and regulate impedance matching. The lower permittivity of FAPbI 3 gives FC an advantage in terms of low-frequency microwave absorption. The FC-4 composite exhibits a minimum reflection loss (RL min ) of −55.67 dB at a low frequency of 6.88 GHz with a thickness of 3.5 mm. Meanwhile, microwave absorption performance can reach 99 % covering almost the entire C band when utilizing a thickness ranging from 3 to 5 mm. Additionally, according to adjusting the load of FAPbI 3 in the mixture, the FC-3 composite displays the highest microwave absorption value among the composites based on halide perovskites. With a thickness of 1.4 mm, the reflection loss at 17.4 GHz reaches an impressive minimum value of −71.89 dB. This study represents the first research specifically focused on FAPbI 3 perovskite in the domain of microwave absorption. FC composites display remarkable capabilities in absorbing microwaves, indicating their promising prospects for advancement within the realm of microwave absorption. This research may provide valuable insights for the design of low-frequency and high-efficiency microwave absorbers.
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
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Yan Cheng,Yue Zhao,Huanqin Zhao,Hualiang Lv,Xiaodong Qi,Jieming Cao,Guangbin Ji,Youwei Du
MoSe 2 is a compelling narrow-band-gap semiconductor with particular lamellar crystal structure, but which is rarely used as microwave absorber filler. Owing to the analogue molecular structure with MoS 2 , it may be a potential dielectric dissipation candidate. The hierarchical flower-like structure has been wide accepted as attractive morphology due to its possible strong multiple scattering and reflecting abilities for microwave, thus, in this study, we employed a facile solvothermal process to fabricate the unique flower-like MoSe 2 spheres for eliminating microwave interference issue. Further through the precise tuning of morphology configurations of flower-like MoSe 2 , the effective absorption to specific microwave frequency band can be well optimized, even including low-frequency band. The microwave absorption (MA) performance results show that the dense-flower samples could achieve full absorption in Ku-band and blooming-flower samples cover the entire X-band. The hollow-flower sample is good at absorption in low frequency of C-band and X-band. Our work not only develops outstanding microwave absorber candidates through delicate nanostructure design, but also paves a new way for tuning effective frequency band via tailoring morphology configurations.
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
EUROPEAN JOURNAL OF PHARMACEUTICAL SCIENCES
·
2021
·
IF 4.384
Ding Zhang,Boqi Chen,Qingke Mu,Wei Wang,Kaili Liang,Liyan Wang,Qing Wang
Anti-cutaneous melanoma activity of the skin-delivered gambogic acid (GA) has been reported in our previous study. However, it is difficult for GA to diffuse passively through intact skin without any enhancement means. In this study, a combination of chemical enhancers (EN: azone and propylene glycol) and physical ultrasound (US) was used to improve the percutaneous permeation of GA and enhance the anti-melanoma activity. The enhancement effect of the combination of EN and US (EN-US) on GA in vitro and in vivo was studied, and the enhancement mechanism and skin irritation were also evaluated. We showed that the parameters of US application at a constant frequency (30 kHz) with a duty cycle of 100% and intensity of 1.75 W/cm 2 for 20 min were optimal. In vitro , EN-US showed a considerable enhancement of the permeation of GA, and the enhancement effect was stronger than that with the use of EN or US alone. In vivo antitumor study showed that the tumor growth was significantly inhibited after percutaneous administration of GA by EN-US, more than in the intravenous injection group. The penetration enhancement mechanism revealed that EN-US not only altered the structure of lipid bilayers and keratins to reduce the barrier effect of the stratum corneum but also produced diffusion channels in the skin under the cavitation effect of US, thereby promoting the skin penetration of GA. In addition, there was no observable skin irritation in mice after treatment with EN-US. Our study demonstrated that the combination of EN and US improved the skin permeation and retention of GA to enhance the anti-melanoma activity. This method also provides technical guidance for the future development of topical and transdermal therapeutic system of GA.
研究领域:
药理学
·
肿瘤学
·
皮肤病学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2017
·
IF 4.217
Jing Guo,Le Zhu,Na Sun,Yeqing Lan
In the presence of low frequency ultrasound (US) generated from an ultrasonic cleaning bath, the degradation efficiency of nitrobenzene (C 6 H 5 NO 2 , NB) by Zn 0 -activated persulfate (PS) reached 96% within 2 h, which is much higher than that by PS or Zn 0 alone in the presence of US or that by Zn 0 -activated PS in the absence of US. The synergistic effect in the US/Zn 0 /PS system and the optimum degradation conditions was investigated by batch experiments. The variations of pH and concentrations of Zn 2+ and SO 4 2− over time and the removal of chemical oxygen demand (COD) and total organic carbon (TOC) in different systems were analyzed, which agreed well with the degradation pattern of NB in different systems. The formation of free radicals was measured using electron paramagnetic resonance (EPR) spectroscopy to further investigate the possible mechanism of the enhanced degradation of NB by Zn 0 -activated PS in the presence of low frequency US.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）