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

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

{"title":"High performance self-driven broadband photodetector for polarized imaging based on novel ZrS3/ReSe2 van der Waals heterojunction","authors":"Lingqi Huang, Peipei Li, Chao Feng, Jing Zhang, Liyun Zhao, Jie Sun, Changhui Du, Wenjia Wang, Kuilong Li","doi":"10.1016/j.mtnano.2024.100527","DOIUrl":"10.1016/j.mtnano.2024.100527","url":null,"abstract":"<div><div>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 ZrS<sub>3</sub>/ReSe<sub>2</sub> 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.</div></div>","PeriodicalId":48517,"journal":{"name":"Materials Today Nano","volume":"28 ","pages":"Article 100527"},"PeriodicalIF":8.2,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142434389","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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

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

{"title":"LaFe-MOFs derivatives with different compositions for boosting low-frequency and broadband electromagnetic wave absorption","authors":"Xiaoli Wang , Juhua Luo , Huajun Zhao , Yuhan Wu , Xing Liu , Yu Xie","doi":"10.1016/j.mtnano.2024.100528","DOIUrl":"10.1016/j.mtnano.2024.100528","url":null,"abstract":"<div><div>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, La<sub>2</sub>O<sub>3</sub>/La<sub>2</sub>O<sub>2</sub>CN<sub>2</sub>/Fe/N-doped carbon (LFC) composites with different compositions were synthesized by adjusting the La<sup>3+</sup> content to tune the electromagnetic parameters. As the La<sup>3+</sup> 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<sub>min</sub>) value of −60.82 dB at a thickness of 2.60 mm when the molar ratio of La<sup>3+</sup> to Fe<sup>3+</sup> 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<sub>min</sub> value of −47.47 dB. Comprehensive characterizations suggested that the formation of the La<sub>2</sub>O<sub>2</sub>CN<sub>2</sub> phase played an indispensable role in optimizing impedance matching and enhancing magnetic loss and dielectric loss. In addition, La<sup>3+</sup> 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.</div></div>","PeriodicalId":48517,"journal":{"name":"Materials Today Nano","volume":"28 ","pages":"Article 100528"},"PeriodicalIF":8.2,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142434392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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

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

{"title":"3D printed PEEK/CF nanocomposites metamaterial for enhanced resonances toward microwave absorption and compatible camouflage","authors":"Xinghan Huang , Ximing Zhang , Guoke Wei , Hang Zhang , Shujuan Tan , Guangbin Ji","doi":"10.1016/j.mtnano.2024.100530","DOIUrl":"10.1016/j.mtnano.2024.100530","url":null,"abstract":"<div><div>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<sup>o</sup> 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 mm<sup>2</sup>, 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.</div></div>","PeriodicalId":48517,"journal":{"name":"Materials Today Nano","volume":"28 ","pages":"Article 100530"},"PeriodicalIF":8.2,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142434391","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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

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

Nuohua Xie , Wenzi Chen , Ya Ning, Xiaojun Zeng

{"title":"Construction of 2D/2D heterostructure with porous few layer g-C3N4 and NiCo2O4 nanosheets towards electromagnetic wave absorption","authors":"Nuohua Xie , Wenzi Chen , Ya Ning, Xiaojun Zeng","doi":"10.1016/j.mtnano.2024.100529","DOIUrl":"10.1016/j.mtnano.2024.100529","url":null,"abstract":"<div><div>Developing high-performance materials with ultra-high reflection loss (<em>R</em><sub>L</sub> ≤ −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-C<sub>3</sub>N<sub>4</sub>/NiCo<sub>2</sub>O<sub>4</sub> heterostructure with porous few-layer g-C<sub>3</sub>N<sub>4</sub> (PFL g-C<sub>3</sub>N<sub>4</sub>) and ultrathin NiCo<sub>2</sub>O<sub>4</sub> 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 (<em>R</em><sub>L</sub>) 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-C<sub>3</sub>N<sub>4</sub> 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-C<sub>3</sub>N<sub>4</sub>/NiCo<sub>2</sub>O<sub>4</sub> (2D/2D) heterostructure. The potential of PFL g-C<sub>3</sub>N<sub>4</sub>/NiCo<sub>2</sub>O<sub>4</sub> 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.</div></div>","PeriodicalId":48517,"journal":{"name":"Materials Today Nano","volume":"28 ","pages":"Article 100529"},"PeriodicalIF":8.2,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142434393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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

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

{"title":"High-performance SERS substrate based on gold nanoparticles-decorated micro/nano-hybrid hierarchical structure","authors":"Chuhao Yao , Xiaomeng Zhang , Cheng Lu , Yu Liu , Hailiang Li , Changqing Xie","doi":"10.1016/j.mtnano.2024.100525","DOIUrl":"10.1016/j.mtnano.2024.100525","url":null,"abstract":"<div><div>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<sup>−11</sup> M, with a calculated enhancement factor of 4.40 × 10<sup>8</sup>, 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.</div></div>","PeriodicalId":48517,"journal":{"name":"Materials Today Nano","volume":"28 ","pages":"Article 100525"},"PeriodicalIF":8.2,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142416807","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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

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

{"title":"Optoplasmonic tuneable response by femtosecond laser irradiation of glass with deep-implanted gold nanoparticles","authors":"Irene Solana , María Dolores Ynsa , Fátima Cabello , Fernando Chacon-Sanchez , Jan Siegel , Mario Garcia-Lechuga","doi":"10.1016/j.mtnano.2024.100526","DOIUrl":"10.1016/j.mtnano.2024.100526","url":null,"abstract":"<div><div>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 (Au<sup>2+</sup> 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.</div></div>","PeriodicalId":48517,"journal":{"name":"Materials Today Nano","volume":"28 ","pages":"Article 100526"},"PeriodicalIF":8.2,"publicationDate":"2024-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142441460","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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

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

{"title":"Magnetic field-enhanced two-electron oxygen reduction reaction using CeMnCo nanoparticles supported on different carbonaceous matrices","authors":"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","doi":"10.1016/j.mtnano.2024.100524","DOIUrl":"10.1016/j.mtnano.2024.100524","url":null,"abstract":"<div><div>The current study illustrates the successful synthesis of Ce<sub>1.0</sub>Mn<sub>0.9</sub>Co<sub>0.1</sub> 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 H<sub>2</sub>O<sub>2</sub> 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 H<sub>2</sub>O<sub>2</sub> 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.</div></div>","PeriodicalId":48517,"journal":{"name":"Materials Today Nano","volume":"28 ","pages":"Article 100524"},"PeriodicalIF":8.2,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142416803","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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

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

{"title":"Nucleation and growth of quasicrystal-related precipitates within the Al-matrix of AlEr(Fe) alloys","authors":"S. Zhan , X.M. Xiang , Y.X. Lai , X.J. Hu , Z.B. He , J.H. Chen","doi":"10.1016/j.mtnano.2024.100522","DOIUrl":"10.1016/j.mtnano.2024.100522","url":null,"abstract":"<div><div>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, Al<sub>3</sub>Er precipitates form firstly in the Al-matrix, then quasicrystal-related (AlFe)-precipitates may nucleate heterogeneously within the Al<sub>3</sub>Er precipitates and grow large. As the quasicrystal-related precipitate grows large, the Al<sub>3</sub>Er-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 Al<sub>13</sub>Fe<sub>4</sub> quasicrystal approximant structure and/or quasicrystal-related aperiodic structures, as well as their surrounding skin with Al<sub>3</sub>Er-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.</div></div>","PeriodicalId":48517,"journal":{"name":"Materials Today Nano","volume":"28 ","pages":"Article 100522"},"PeriodicalIF":8.2,"publicationDate":"2024-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142416806","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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

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

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

{"title":"Design and validation of an automated and remote free space measurement system for nondestructive testing of fiber composites","authors":"Azim Uddin , Diana Estevez , Hua-Xin Peng , Faxiang Qin","doi":"10.1016/j.mtnano.2024.100521","DOIUrl":"10.1016/j.mtnano.2024.100521","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":48517,"journal":{"name":"Materials Today Nano","volume":"28 ","pages":"Article 100521"},"PeriodicalIF":8.2,"publicationDate":"2024-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142416809","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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

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

{"title":"Lightweight dielectric-magnetic synergistic necklace-shaped Co@NCP/carbon nanofiber composites for enhanced electromagnetic wave absorption","authors":"Dan Wu , Di Lan , Shijie Zhang , Qinchuan He , Xiping Zhou , Yiqun Wang","doi":"10.1016/j.mtnano.2024.100520","DOIUrl":"10.1016/j.mtnano.2024.100520","url":null,"abstract":"<div><div>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 m<sup>2</sup>, 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.</div></div>","PeriodicalId":48517,"journal":{"name":"Materials Today Nano","volume":"28 ","pages":"Article 100520"},"PeriodicalIF":8.2,"publicationDate":"2024-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142416808","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0