Nano Materials Science
·
2024
·
IF 12.6
Liquan Fan,Honglin Ai,Meiye Jiao,Yao Li,Yongheng Jin,Yiru Fu,Jing Wang,Yuwei Wang,Deqing Zhang,Guangping Zheng,Junye Cheng
As electromagnetic technology advances and demand for electronic devices grows, concerns about electromagnetic pollution intensify. This has spurred focused research on innovative electromagnetic absorbers, particularly chalcogenides, noted for their superior absorption capabilities. In this study, we successfully synthesize 3R–TaS 2 nanosheets using a straightforward calcination method for the first time. These nanosheets exhibit significant absorption capabilities in both the C-band (4–8 GHz) and Ku-band (12–18 GHz) frequency ranges. By optimizing the calcination process, the complex permittivity of TaS 2 is enhanced, specifically for those synthesized at 1000 °C for 24 h. The nanosheets possess dual-band absorption properties, with a notable minimum reflection loss (RL min ) of −41.4 dB in the C-band, and an average absorption intensity exceeding 10 dB in C- and Ku-bands, in the absorbers with a thickness of 5.6 mm. Additionally, the 3R–TaS 2 nanosheets are demonstrated to have an effective absorption bandwidth of 5.04 GHz (3.84–8.88 GHz) in the absorbers with thicknesses of 3.5–5.5 mm. The results highlight the multiple reflection effects in 3R–TaS 2 as caused by their stacked structures, which could be promising low-frequency 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
COMPOSITES SCIENCE AND TECHNOLOGY
·
2022
·
IF 9.879
Yuanyuan Yao,Shaohua Jin,Dongxu Wang,Junfeng Wang,Dongze Li,Xijuan Lv,Qinghai Shu
The rapid development of electronic information technology has brought huge challenges to high-performance electromagnetic interference (EMI) shielding films, especially for multi-band shielding. In this work, the core-shell structure of polydopamine coated silver nanowires (AgNWs) was formed by in situ polymerization of dopamine on the surface of AgNWs, the modified AgNWs were attached to the layered graphene surface through noncovalent bonds, magnetic Fe 3 O 4 particles were then loaded on graphene/AgNWs to form magnetoelectric coupling fillers and cast with polyvinyl alcohol (PVA) to obtain nanocomposite films. The conductive fillers were uniformly dispersed in the PVA matrix with well compatibility, the resulting composite films not only displayed good flexibility, but also had been first time reported to show fine EMI shielding performance in both GPS band and X band thanks to the synergistic effect from the combination of conductive and magnetic fillers through an innovative structure. These nanocomposite films with good EMI shielding properties would show good application prospects in the fields of flexible electronics, electromagnetic countermeasure and stealth materials.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2016
·Vol. 4
·期 41
·9738-9749
·
IF 5.066
Peijiang Liu,Zhengjun Yao,Jintang Zhou,Zhihong Yang,Ling Bing Kong
In this study, novel CNZF (Co-doped Ni–Zn ferrite)/GN (graphene) nanocomposites were prepared by using a facile one-pot hydrothermal method. The phase structure, morphology, and magnetic and electromagnetic performance of the nanocomposites were studied by means of modern measurement techniques. Both sides of the GN sheets were densely covered by CNZF nanoparticles. Moreover, the magnetic nanoparticles had a uniform distribution without the presence of significant agglomeration. The electromagnetic performance indicated that the content of GN played a significant role in determining the dielectric behavior and magnetic anisotropy of the carbon materials, which further influenced the impedance matching and attenuation ability of absorbers. The microwave absorption properties showed that the CNZF/GN-10 nanocomposite exhibited dual-region microwave absorption, with two strong reflection loss peaks of −53.5 dB and −58.3 dB at 9.6 GHz and 5.2 GHz, respectively. The effective absorption bandwidths were as wide as 14.8 GHz, with thicknesses in the range of 1.5–6.0 mm. In addition, such dual-region absorption performance was also observed in CNZF/GN nanocomposites with other compositions. The appearance of dual-region absorption and the mechanism of microwave absorption were discussed in detail. It is expected that this CNZF/GN nanocomposite can be used as a new type of an efficient microwave absorber with light weight.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
OPTICS AND LASERS IN ENGINEERING
·
2025
·
IF 3.7
Binggang Xiao,Yichun Wang,Xiuran Zuo,Luqi Liu,Jianyuan Qin,Wanshun Jiang,Yumei Zhang,Lihua Xiao
This study presents a dual-band terahertz metasurface biosensor based on the electromagnetically induced transparency (EIT) effect. The sensor employs copper resonant rings and a quartz dielectric substrate, enabling switching between single and dual-EIT (D-EIT) modes by altering the polarization direction of incident terahertz waves. The physical mechanism of the dual-EIT effect was elucidated through electric field analysis, revealing bright-dark mode coupling (0.53 THz) and bright-bright mode coupling (0.76 THz). Simulations demonstrated a refractive index sensitivity of up to 220 GHz/RIU. Experimentally, the metasurfacel fabricated via laser engraving exhibited dual-frequency sensing capabilities for lactose and chlortetracycline hydrochloride, with a minimum detectable concentration of 0.1 mg/L in both aqueous and milk solutions. Despite limitations in low-concentration detection within complex media due to increased optical loss, this sensor shows significant potential for applications in food safety and antibiotic residue monitoring.
研究领域:
传感器
·
光学
·
生物物理学
·
纳米技术
·
分析化学
·
食品安全
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 25
·1-15
·
IF 2.8
Yan Yuefeng,Cheng Ziyan,Ma Guansheng,Chen Tao,Gao Boshi,Liu Yuhao,Huang Xiaoxiao
Reduced Graphene Oxide (RGO) has been proved to be a promising electromagnetic wave absorption (EMWA) material candidate owing to its superior electrical and dielectric properties, along with rich potential for structural design. However, the complicated synthesis process and the contradiction between impedance matching and attenuation capacity have hindered the further development and application of graphene-based absorbing materials. Herein, a Fe nanoparticle/RGO composites was synthesized through a facile in-situ chemical reduction process. The configuration of Fe nanoparticles regulates the permittivity and permeability of RGO and balances the impedance matching. The dipole polarization caused by the residual oxygen-containing functional groups in RGO, coupled with the interfacial polarization loss caused by the Fe/RGO interface, enhance the dielectric loss capacity, contributing to microwave loss in the high-frequency range. The natural resonance and exchange resonance caused by the nano Fe particles enhance the microwave loss capacity in the low-frequency range. Benefitting from the synergistic enhancement from dielectric loss and magnetic loss, Fe/RGO composites exhibit the characteristic of daul-band absorption. Notably, the sample FG-0.25 achieved an effective absorption bandwidth ( EAB ) of 5.33 GHz and a minimum reflection loss ( RL min ) of −48.9 dB. The absorption peaks in the low-frequency band can encompass a significant portion of the C-band. This research provides unique insights for the advancement of environmentally friendly and energy-efficient RGO based EMWA materials.
研究领域:
材料科学
·
电磁波吸收
·
纳米复合材料
·
微波吸收材料
✓ 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）