Materials Today Nano最新文献_第2页

High performance self-driven broadband photodetector for polarized imaging based on novel ZrS3/ReSe2 van der Waals heterojunction 基于新型 ZrS3/ReSe2 范德华异质结的高性能自驱动偏振成像宽带光电探测器

IF 8.2 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today Nano

Pub Date : 2024-10-09 DOI: 10.1016/j.mtnano.2024.100527

Lingqi Huang, Peipei Li, Chao Feng, Jing Zhang, Liyun Zhao, Jie Sun, Changhui Du, Wenjia Wang, Kuilong Li

The distinctive characteristics of anisotropic two-dimensional (2D) materials, including in-plane anisotropy of optical absorption and carrier mobility, render them exceptionally suitable for application in the field of polarization detection and as a novel platform for the polarization imaging. Meanwhile, the consolidation of diverse functionalities within a single photodetector is highly anticipated to meet the demands of some special scenarios. Herein, a novel ZrS₃/ReSe₂ van der Waals (vdWs) heterostructure device was successfully constructed to realize polarization-sensitive, self-powered, and broadband photodetection and imaging. Owing to the built-in electric field of the type-II band alignment within the heterojunction, the device achieves a self-powered photoresponse ranging from 300 to 980 nm, an ultralow dark currentt ∼1 pA, and a commendable rise/decay time of 0.35/0.28 ms. Additionally, it has been demonstrated that the self-driven photodetector possesses a polarization-sensitivity with a notable anisotropic ratio about 2.02 (1.98) under 490 nm (980 nm) light illumination with zero bias, coupled with an excellent repeatability and stability. Furthermore, we also demonstrate the polarization imaging capabilities of the device in visible and near-infrared spectrum, realizing a contrast-enhanced degree of linear polarization imaging. This work paves a new platform to develop heterojunction photodetectors for high performance polarization-sensitive photodetection and next-generation polarized imaging.

各向异性二维（2D）材料的独特特性，包括光学吸收和载流子迁移率的面内各向异性，使其特别适合应用于偏振检测领域，并成为偏振成像的新型平台。同时，在单个光电探测器中整合多种功能以满足一些特殊应用场景的需求也备受期待。在此，我们成功构建了一种新型 ZrS3/ReSe2 范德瓦耳斯（vdWs）异质结构器件，以实现偏振敏感、自供电和宽带光电探测与成像。由于异质结内 II 型带排列的内置电场，该器件实现了从 300 纳米到 980 纳米的自供电光响应、超低暗电流 t ∼ 1 pA 以及值得称赞的 0.35/0.28 毫秒上升/衰减时间。此外，我们还证明了自驱动光电探测器具有偏振灵敏度，在 490 nm（980 nm）光照和零偏压条件下，各向异性比约为 2.02（1.98），同时具有出色的重复性和稳定性。此外，我们还展示了该装置在可见光和近红外光谱下的偏振成像能力，实现了对比度增强的线性偏振成像。这项工作为开发用于高性能偏振敏感光探测和下一代偏振成像的异质结光电探测器铺平了新的平台。

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引用次数: 0

LaFe-MOFs derivatives with different compositions for boosting low-frequency and broadband electromagnetic wave absorption 不同成分的 LaFe-MOFs 衍生物用于提高低频和宽带电磁波吸收率

IF 8.2 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today Nano

Pub Date : 2024-10-09 DOI: 10.1016/j.mtnano.2024.100528

Xiaoli Wang , Juhua Luo , Huajun Zhao , Yuhan Wu , Xing Liu , Yu Xie

To achieve low-frequency and broadband electromagnetic wave absorption (EMWA), building excellent metal-organic frameworks (MOFs)-derived EMWA materials is critical but remains challenging. In this research, La₂O₃/La₂O₂CN₂/Fe/N-doped carbon (LFC) composites with different compositions were synthesized by adjusting the La³⁺ content to tune the electromagnetic parameters. As the La³⁺ content increased, the EMWA performance showed a trend of first increasing and then decreasing. As a result, LFC-2 achieved a minimum reflection loss (RL_min) value of −60.82 dB at a thickness of 2.60 mm when the molar ratio of La³⁺ to Fe³⁺ was 1: 1, along with an effective absorption bandwidth value of 5.76 GHz (9.84–15.60 GHz) at 2.29 mm. Moreover, the EMWA performance of LFC-3 at low-frequency (4.08 GHz) was enhanced when the La³⁺ to Fe³⁺ molar ratio was 2: 1, with an RL_min value of −47.47 dB. Comprehensive characterizations suggested that the formation of the La₂O₂CN₂ phase played an indispensable role in optimizing impedance matching and enhancing magnetic loss and dielectric loss. In addition, La³⁺ had a high coordination number, which effectively regulated the electromagnetic parameters. Concurrently, radar cross-section simulation results confirmed the outstanding EMWA capability of the LFC coating. This work proposed a strategy for LaFe-MOFs derivatives, shedding light on the foundation for designing more efficient low-frequency and broadband absorbent materials.

要实现低频和宽带电磁波吸收（EMWA），构建由金属有机框架（MOFs）衍生的优异电磁波吸收材料至关重要，但仍然具有挑战性。本研究通过调节 La3+ 的含量，合成了不同成分的 La2O3/La2O2CN2/Fe/N 掺杂碳（LFC）复合材料，以调节电磁参数。随着 La3+ 含量的增加，EMWA 性能呈现出先升高后降低的趋势。结果，当 La3+ 与 Fe3+ 的摩尔比为 1:1 时，LFC-2 在厚度为 2.60 mm 时的最小反射损耗（RLmin）值为 -60.82 dB，在 2.29 mm 时的有效吸收带宽值为 5.76 GHz（9.84-15.60 GHz）。此外，当 La³⁺ 与 Fe³⁺ 的摩尔比为 2: 1 时，LFC-3 在低频（4.08 GHz）的 EMWA 性能得到增强，RLmin 值为 -47.47 dB。综合表征结果表明，La2O2CN2 相的形成在优化阻抗匹配、提高磁损耗和介电损耗方面发挥了不可或缺的作用。此外，La3+ 的配位数较高，可有效调节电磁参数。同时，雷达截面模拟结果也证实了 LFC 涂层出色的电磁兼容能力。这项研究提出了 LaFe-MOFs 衍生物的策略，为设计更高效的低频和宽带吸波材料奠定了基础。

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引用次数: 0

3D printed PEEK/CF nanocomposites metamaterial for enhanced resonances toward microwave absorption and compatible camouflage 三维打印 PEEK/CF 纳米复合材料超材料，用于增强微波吸收共振和兼容伪装

IF 8.2 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today Nano

Pub Date : 2024-10-09 DOI: 10.1016/j.mtnano.2024.100530

Xinghan Huang , Ximing Zhang , Guoke Wei , Hang Zhang , Shujuan Tan , Guangbin Ji

The stealth materials for future weapons and equipment need to operate within the radar working band, be lightweight, easy to process, and compatible with infrared stealth. Integrating all these characteristics poses a significant challenge. This work utilizes poly (ether-ether-ketone)/carbon fibers (PEEK/CF) composite materials and employed reverse-guided manufacturing through simulation design. Incorporating a grid structure within the pyramid metamaterial enables electromagnetic wave reflecting multiple times in various directions. By optimizing the important interaction between dielectric properties of the materials structures，the Pyramid Grid Filled Metamaterial enables broadband electromagnetic wave absorption (<-10 dB, 8–18 GHz), weak angular dependence (5- 45^o incidence), polarization insensitivity, radar cross section (RCS) reduction (reduction over 10 dB between θ = −60° and 60°), and infrared camouflage performance. The PGF metamaterial of 180◊180 mm², weighs only 103.1 g at a thickness of 9 mm. This work paves a way for the design the radar infrared compatible composite metamaterials.

未来武器装备的隐形材料需要在雷达工作波段内工作，重量轻，易于加工，并与红外隐形兼容。整合所有这些特性是一项重大挑战。这项研究利用聚醚醚酮/碳纤维（PEEK/CF）复合材料，通过模拟设计采用反向引导制造。在金字塔超材料中加入网格结构，可实现电磁波在不同方向的多次反射。通过优化材料结构介电特性之间的重要相互作用，金字塔网格填充超材料实现了宽带电磁波吸收（-10 dB，8-18 GHz）、弱角度依赖性（5-45°入射角）、极化不敏感性、雷达截面（RCS）减小（θ = -60° 和 60° 之间减小超过 10 dB）和红外伪装性能。PGF 超材料的面积为 180◊180 平方毫米，厚度为 9 毫米，重量仅为 103.1 克。这项工作为设计雷达红外兼容复合超材料铺平了道路。

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引用次数: 0

Construction of 2D/2D heterostructure with porous few layer g-C3N4 and NiCo2O4 nanosheets towards electromagnetic wave absorption 利用多孔少层 g-C3N4 和 NiCo2O4 纳米片构建二维/二维异质结构以吸收电磁波

IF 8.2 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today Nano

Pub Date : 2024-10-09 DOI: 10.1016/j.mtnano.2024.100529

Nuohua Xie , Wenzi Chen , Ya Ning, Xiaojun Zeng

Developing high-performance materials with ultra-high reflection loss (R_L ≤ −65 dB) for electromagnetic wave (EMW) absorption is pivotal to address electromagnetic pollution, but it is still challenging. Herein, a two-dimensional (2D)/2D PFL g-C₃N₄/NiCo₂O₄ heterostructure with porous few-layer g-C₃N₄ (PFL g-C₃N₄) and ultrathin NiCo₂O₄ nanosheets has been prepared by self-assembly, hydrothermal reaction, and calcination strategies. The 2D/2D heterostructure exhibits extraordinary EMW absorption property, achieving a reflection loss (R_L) value of −68.59 dB and an effective absorption bandwidth (EAB) of 1.92 GHz at a matching thickness of 2.5 mm. As expected, the porous few layer g-C₃N₄ nanosheets provide rich interface which increases multiple reflection paths and enhances the conduction loss. The cooperative effects of magnetic loss, dielectric loss, and impedance matching contribute to the exceptional EMW absorption property of PFL g-C₃N₄/NiCo₂O₄ (2D/2D) heterostructure. The potential of PFL g-C₃N₄/NiCo₂O₄ in actual radar stealth is verified through radar scattering cross-section (RCS) simulation. This work paves the way for utilizing 2D/2D heterostructure as an ultra-efficient EMW absorbers.

开发具有超高反射损耗（RL ≤ -65dB）的高性能电磁波（EMW）吸收材料是解决电磁污染问题的关键，但目前仍面临挑战。本文通过自组装、水热反应和煅烧策略制备了一种具有多孔少层 g-C3N4（PFL g-C3N4）和超薄 NiCo2O4 纳米片的二维（2D）/二维 PFL g-C3N4/NiCo2O4 异质结构。这种二维/二维异质结构具有非凡的电磁波吸收特性，在匹配厚度为 2.5 毫米时，反射损耗（RL）值为 -68.59 dB，有效吸收带宽（EAB）为 1.92 GHz。正如预期的那样，多孔的几层 g-C3N4 纳米片提供了丰富的界面，从而增加了多条反射路径并提高了传导损耗。磁损耗、介质损耗和阻抗匹配的共同作用使 PFL g-C3N4/NiCo2O4 (2D/2D) 异质结构具有优异的电磁波吸收特性。通过雷达散射截面（RCS）模拟验证了 PFL g-C3N4/NiCo2O4 在实际雷达隐形中的潜力。这项工作为利用 2D/2D 异质结构作为超高效电磁波吸收体铺平了道路。

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引用次数: 0

High-performance SERS substrate based on gold nanoparticles-decorated micro/nano-hybrid hierarchical structure 基于金纳米颗粒装饰微/纳米杂化分层结构的高性能 SERS 基底

IF 8.2 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today Nano

Pub Date : 2024-10-05 DOI: 10.1016/j.mtnano.2024.100525

Chuhao Yao , Xiaomeng Zhang , Cheng Lu , Yu Liu , Hailiang Li , Changqing Xie

Owing to its excellent localized surface plasmon resonance (LSPR) effect, noble metal nanoparticles (NPs) find extensive application in the preparation of surface-enhanced Raman scattering (SERS) substrates. However, due to process limitations, the practicality and testing effectiveness of SERS substrates still leaves much to be desired. Here, a wafer-scale gold (Au) NPs silicon (Si) micro/nano-hybrid structured substrate is prepared. This is achieved through two-step etching, followed by decorating Au-NPs onto the structure via self-assembly process induced by de-wetting. Finite-difference time-domain (FDTD) simulations reveal that the significant enhancement of local electric field in the voids between Au-NPs and Si is crucial for enhancing SERS. Using Rhodamine 6G (R6G) as the probe molecule, performance of the fabricated SERS substrate is investigated. It demonstrates a minimum detection limit of 10⁻¹¹ M, with a calculated enhancement factor of 4.40 × 10⁸, indicating its high sensitivity. The minimum relative standard deviation for the substrate is 5.254 %. After 20 days of placement, the SERS performance show tiny variation. Even after four cycles of cleaning experiments, it still maintains outstanding SERS performance. This demonstrates its excellent stability, uniformity and reusability. Our research provides guidance for the efficient and low-cost fabrication of high-performance SERS substrates.

由于贵金属纳米粒子（NPs）具有出色的局部表面等离子体共振（LSPR）效应，因此在制备表面增强拉曼散射（SERS）基底中得到了广泛应用。然而，由于工艺的限制，SERS 基底的实用性和测试效果仍有待提高。在这里，我们制备了一种晶圆级金（Au）纳米粒子硅（Si）微/纳米杂化结构基底。这是通过两步蚀刻实现的，然后通过去湿诱导的自组装过程将 Au-NPs 装饰到结构上。有限差分时域（FDTD）模拟显示，Au-NPs 和硅之间空隙中局部电场的显著增强是增强 SERS 的关键。使用罗丹明 6G（R6G）作为探针分子，研究了所制造的 SERS 基底的性能。它的最低检测限为 10-11 M，计算出的增强因子为 4.40 × 108，这表明它具有很高的灵敏度。基底的最小相对标准偏差为 5.254%。放置 20 天后，SERS 性能变化很小。即使经过四次清洁实验，它仍然保持着出色的 SERS 性能。这表明它具有出色的稳定性、均匀性和可重复使用性。我们的研究为高效、低成本地制造高性能 SERS 基底提供了指导。

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引用次数: 0

Optoplasmonic tuneable response by femtosecond laser irradiation of glass with deep-implanted gold nanoparticles 用飞秒激光辐照深植入金纳米粒子的玻璃，实现光电可调响应

IF 8.2 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today Nano

Pub Date : 2024-10-03 DOI: 10.1016/j.mtnano.2024.100526

Irene Solana , María Dolores Ynsa , Fátima Cabello , Fernando Chacon-Sanchez , Jan Siegel , Mario Garcia-Lechuga

The manipulation of the optical properties of plasmonic nanocomposites is of high interest for the development of advanced optical devices with tailored unique properties. Achieving these objectives requires a combination of synthesis techniques and post-fabrication strategies. Here, we combine the use of two well-established physical strategies: MeV ion implantation and femtosecond laser processing. Firstly, we synthesize Au-doped soda lime glass nanocomposite through ion beam implantation (Au²⁺ at 1.8 MeV) followed by thermal annealing. This synthesis procedure results in a peculiar optical response based on the combination of Au-nanoparticle plasmonic resonance and a Fabry-Perot interference, caused by the deep implantation (centered at 480 nm). Secondly, this dual response is demonstrated to be highly tuneable by non-resonant femtosecond laser irradiation (800-nm wavelength and 130-fs pulse duration). Depending on the laser fluence, three transformation regimes are distinguished: supressing the interferometric response by spallative ablation, inducing vivid blue colors by surface swelling, and producing red-shifted color changes by multi-shot irradiation at low fluences. The proposed method is very versatile, since it is applicable to any dielectric matrix or implanted element. This work paves the way to a new route for the development of scalable and tuneable nanocomposites with several potential applications in optics.

操纵等离子纳米复合材料的光学特性，对于开发具有定制独特特性的先进光学设备具有重要意义。要实现这些目标，需要将合成技术和后加工策略相结合。在这里，我们结合使用了两种成熟的物理策略：MeV 离子注入和飞秒激光加工。首先，我们通过离子束植入（1.8 MeV 的 Au2+）合成掺金钠钙玻璃纳米复合材料，然后进行热退火。这一合成过程产生了一种奇特的光学响应，其基础是金纳米粒子质子共振与法布里-珀罗干涉的结合，而法布里-珀罗干涉是由深度植入（以 480 纳米为中心）引起的。其次，通过非共振飞秒激光照射（波长 800 纳米，脉冲持续时间 130fs），证明了这种双重响应的高度可调性。根据激光流率的不同，可区分出三种转变机制：通过剥落烧蚀抑制干涉响应，通过表面膨胀诱导鲜艳的蓝色，以及通过低流率下的多射辐照产生红移颜色变化。所提出的方法非常灵活，因为它适用于任何电介质基体或植入元件。这项工作为开发可扩展、可调整的纳米复合材料铺平了新的道路，在光学领域具有多种潜在应用。

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引用次数: 0

Magnetic field-enhanced two-electron oxygen reduction reaction using CeMnCo nanoparticles supported on different carbonaceous matrices 使用支撑在不同碳质基质上的钴锰合金纳米粒子进行磁场增强型双电子氧还原反应

IF 8.2 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today Nano

Pub Date : 2024-10-01 DOI: 10.1016/j.mtnano.2024.100524

Caio Machado Fernandes , João Paulo C. Moura , Aline B. Trench , Odivaldo C. Alves , Yutao Xing , Marcos R.V. Lanza , Júlio César M. Silva , Mauro C. Santos

The current study illustrates the successful synthesis of Ce_1.0Mn_0.9Co_0.1 nanoparticles, characterized through XRD, EPR, magnetization curves, and TEM/HRTEM/EDX analyses. These nanoparticles were then loaded into the carbon Vulcan XC72 and the carbon Printex L6 matrices in varying amounts (1, 3, 5, and 10 % w/w) via wet impregnation method to fabricate electrocatalysts for the 2-electron ORR. Before experimentation, the material was characterized via XPS and contact angle measurements. The electrochemical results produced significant findings, indicating that the electrocatalysts with the nanostructures modifying both carbon blacks notably augmented currents in rotating ring-disk electrode measurements, signifying enhanced selectivity for H₂O₂ production. Moreover, our research underscored the significant impact of Magnetic Field-Enhanced Electrochemistry, employing a constant magnetic field strength of 2000 Oe, on 2-electron ORR experiments. Particularly noteworthy were the observed results surpassing the ones without the magnetic field, demonstrating heightened currents and improved selectivity for H₂O₂ production (more than 90 %) facilitated by CeMnCo nanoparticles. These significant findings in electrocatalytic efficiency have practical implications, suggesting the potential for developing more efficient and selective catalysts for the 2-electron ORR.

本研究成功合成了 Ce1.0Mn0.9Co0.1 纳米粒子，并通过 XRD、EPR、磁化曲线和 TEM/HRTEM/EDX 分析对其进行了表征。然后，通过湿浸渍法将这些纳米粒子以不同的用量（1%、3%、5% 和 10% w/w）添加到碳 Vulcan XC72 和碳 Printex L6 基质中，制造出双电子 ORR 的电催化剂。实验前，通过 XPS 和接触角测量对材料进行了表征。电化学结果表明，在旋转环盘电极测量中，对两种碳黑都进行了纳米结构修饰的电催化剂电流明显增大，这表明 H2O2 生成的选择性增强。此外，我们的研究还强调了磁场增强电化学（采用 2000 Oe 的恒定磁场强度）对双电子 ORR 实验的重要影响。尤其值得注意的是，观察到的结果超过了没有磁场的结果，表明 CeMnCo 纳米粒子促进了电流的增加和 H2O2 生成选择性的提高（超过 90%）。这些关于电催化效率的重要发现具有实际意义，表明有可能为 2 电子 ORR 开发出更高效、更具选择性的催化剂。

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引用次数: 0

Nucleation and growth of quasicrystal-related precipitates within the Al-matrix of AlEr(Fe) alloys AlEr(Fe) 合金的铝基体中准晶体相关沉淀的成核与生长

IF 8.2 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today Nano

Pub Date : 2024-09-29 DOI: 10.1016/j.mtnano.2024.100522

S. Zhan , X.M. Xiang , Y.X. Lai , X.J. Hu , Z.B. He , J.H. Chen

Since the discovery of quasicrystals, their applications to industry have been interesting issues, among which attempts of introducing quasicrystal-related precipitates into the Al-matrix to enhance properties of Al alloys have been made without adequate understandings. Here, we report a formation pathway of quasicrystal-related precipitates in the Al-matrix of an AlEr(Fe) alloy. It is shown that upon thermal aging of the alloy, Al₃Er precipitates form firstly in the Al-matrix, then quasicrystal-related (AlFe)-precipitates may nucleate heterogeneously within the Al₃Er precipitates and grow large. As the quasicrystal-related precipitate grows large, the Al₃Er-precipitate reform as the thin “skin” of the formed composite precipitate, keeping the quasicrystal-related portion well separated from the matrix. Atomic-resolution electron microscopy and spectroscopy reveal that these composite precipitates are the mixtures of the Al₁₃Fe₄ quasicrystal approximant structure and/or quasicrystal-related aperiodic structures, as well as their surrounding skin with Al₃Er-structure. As such, Fe atoms as vexing impurity in Al alloys can be absorbed continuously into such composite precipitates. Our findings provide insights into the feasibility to form quasicrystal-related precipitates in the Al-matrix.

自发现准晶体以来，其在工业中的应用一直是令人关注的问题，其中在铝基体中引入准晶体相关析出物以提高铝合金性能的尝试一直没有得到充分的理解。在此，我们报告了 AlEr（Fe）合金的铝基体中准晶相关析出物的形成途径。研究表明，合金热老化后，首先在铝基体中形成 Al3Er 沉淀，然后准晶相关（AlFe）沉淀可能在 Al3Er 沉淀中异质成核并逐渐增大。随着准晶相关沉淀的增大，Al3Er-沉淀会重新形成复合沉淀的薄 "表皮"，从而使准晶相关部分与基体保持良好的分离。原子分辨率电子显微镜和光谱分析显示，这些复合沉淀物是 Al13Fe4 准晶近似结构和/或准晶相关非周期性结构的混合物，以及其周围带有 Al3Er 结构的表皮。因此，铝合金中令人头疼的杂质铁原子可以被不断吸收到这种复合沉淀物中。我们的研究结果为在铝基体中形成准晶体相关沉淀物的可行性提供了启示。

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引用次数: 0

Design and validation of an automated and remote free space measurement system for nondestructive testing of fiber composites 设计并验证用于纤维复合材料无损检测的自动化远程自由空间测量系统

IF 8.2 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today Nano

Pub Date : 2024-09-28 DOI: 10.1016/j.mtnano.2024.100521

Azim Uddin , Diana Estevez , Hua-Xin Peng , Faxiang Qin

Assessing electromagnetic constitutive parameters is crucial to prescribe the macroscopic properties of composites and their prospective applications. Free space methods are widely used for this purpose, due to their nondestructive/noncontact nature and their applicability on composites incorporating large inclusions or over-frequency bands where waveguide measurements are impractical. However, there still exists issues associated with automation, accurate calibration, remote controlling, and multifunctional characterization. Here, we designed and implemented a microwave-integrated laboratory including a test bench for permittivity/permeability and impedance measurements of individual inclusions and a free space setup for transmission/reflection measurements of fiber-based composites. Easy switching between the bench and antenna measurements was enabled by a homemade RF multiplexer. A three-stage calibration was applied: 2-port error correction (12-term model) of the vector network analyzer and the cables connecting it to the multiplexer, de-embedding of the cables connecting the multiplexer to the switches within the antenna pillars, and thru, reflect, and line (TRL) error correction for the antennas and free space. Exploiting robotics for precise antenna movement and TRL calibration enabled adjustment of the antenna distance to the test frame to a maximum of 2.5 m with a 100 μm accuracy. A multifunctional frame for external stimuli application was also designed. Apart from automation, remote control was realized through user-friendly graphical interfaces and remote access software allowing to swiftly respond to challenges faced during the global pandemic. The free space setup effectiveness was then validated by measuring the transmission/reflection of microwire-based composites from 0.5 to 20 GHz under various magnetic fields.

评估电磁构成参数对于确定复合材料的宏观特性及其应用前景至关重要。由于自由空间方法具有无损/非接触的性质，并且适用于含有大量夹杂物或超频段的复合材料，而波导测量在这些地方是不切实际的，因此自由空间方法在这方面得到了广泛应用。然而，在自动化、精确校准、远程控制和多功能表征方面仍然存在问题。在这里，我们设计并实施了一个微波集成实验室，包括一个用于测量单个夹杂物的介电系数/渗透率和阻抗的测试台，以及一个用于测量纤维基复合材料的透射/反射的自由空间装置。通过自制的射频多路复用器，可以在工作台和天线测量之间轻松切换。采用了三阶段校准：矢量网络分析仪及其与多路复用器连接的电缆的双端口误差校正（12 项模型）、多路复用器与天线支柱内开关连接的电缆去嵌入，以及天线和自由空间的穿透、反射和线路（TRL）误差校正。利用机器人技术进行精确的天线移动和 TRL 校准，可将天线与测试框架的距离调整到最大 2.5 米，精度为 100 微米。此外，还设计了一个用于外部刺激的多功能框架。除自动化外，还通过用户友好的图形界面和远程访问软件实现了远程控制，以便迅速应对全球大流行期间面临的挑战。然后，通过测量各种磁场下 0.5 至 20 千兆赫微线基复合材料的传输/反射，验证了自由空间设置的有效性。

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引用次数: 0

Lightweight dielectric-magnetic synergistic necklace-shaped Co@NCP/carbon nanofiber composites for enhanced electromagnetic wave absorption 用于增强电磁波吸收的轻质介电-磁协同项链形 Co@NCP/ 碳纳米纤维复合材料

IF 8.2 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today Nano

Pub Date : 2024-09-28 DOI: 10.1016/j.mtnano.2024.100520

Dan Wu , Di Lan , Shijie Zhang , Qinchuan He , Xiping Zhou , Yiqun Wang

In order to solve the problem of impedance mismatch of carbon fiber absorbing materials, it is crucial to create a carbon-based absorbing material with a special structure, synergistic magnetic and dielectric properties. In this paper, necklace-shaped Co@N-doped carbon polyhedron/carbon nanofiber (Co@NCP/CNF) composites with synergistic magnetic and dielectric properties are successfully fabricated by electrospinning. Compared with Co@NCP and CNF, the optimal minimum reflection loss of Co@NCP/CNF composite is −66.14 dB at 2.89 mm and the maximum effective absorption bandwidth is 6.24 GHz (11.76–18.00 GHz) at 2.25 mm at a low filler load of 10 wt%. The necklace-like structure, the coupling effect of dielectric and magnetic materials and the heterogeneous interface form multiple polarizations, conductive losses and multiple loss mechanisms to optimize impedance matching and attenuation performance, which is conducive to excellent absorption performance. More importantly, the radar cross section (RCS) reduction is as high as 24.02 dB m², which has proven to have a good absorption effect in actual application environments. This work combines the advantages of Co@NCP and CNF very well, which provides guidance for designing EM waves nanocomposite fiber absorbers with lightweight and strong absorbing properties.

为了解决碳纤维吸波材料的阻抗失配问题，创造一种具有特殊结构、协同磁性和介电特性的碳基吸波材料至关重要。本文利用电纺丝技术成功制备了具有协同磁性和介电特性的项链形 Co@N 掺杂碳多面体/碳纳米纤维（Co@NCP/CNF）复合材料。与 Co@NCP 和 CNF 相比，Co@NCP/CNF 复合材料在 2.89 mm 时的最佳最小反射损耗为 -66.14 dB，在 10 wt%的低填充载荷下，2.25 mm 时的最大有效吸收带宽为 6.24 GHz (11.76-18.00 GHz)。项链状结构、电介质和磁性材料的耦合效应以及异质界面形成了多重极化、导电损耗和多重损耗机制，优化了阻抗匹配和衰减性能，有利于实现优异的吸收性能。更重要的是，其雷达截面（RCS）降低率高达 24.02 dB m2，在实际应用环境中被证明具有良好的吸收效果。这项工作很好地结合了 Co@NCP 和 CNF 的优点，为设计具有轻质、强吸波性能的电磁波纳米复合纤维吸波材料提供了指导。

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