Materials Today Physics最新文献_第5页

Advanced high-entropy nanoalloys toward renewable energy electrocatalysis 用于可再生能源电催化的先进高熵纳米合金

IF 9.7 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today Physics

Pub Date : 2026-02-01 Epub Date: 2026-01-30 DOI: 10.1016/j.mtphys.2026.102035

Yajing Qi , Tianci Wei , Lin He , Xiaoran Bi , Xiaoyue An , Chunji Li , Weiwei Yang , Yongsheng Yu , Menggang Li

Alloying has long been recognized as one of the most promising strategies for designing high-performance metal-based electrocatalysts. However, the limited range of available elemental species in conventional alloys often restricts the continuous-tuning of the surface electronic structure of metal catalysts. High-entropy nanoalloys (HENAs), with their diverse compositional and structural characteristics, offer a pathway to overcome the limitations of traditional binary or ternary alloys, providing adsorption/desorption energies towards reaction intermediates closer to the optimum. Therefore, HENAs have emerged as promising candidates for electrocatalytic reactions integral to various renewable energy technologies, such as fuel cells, water electrolyzers, etc., and have witnessed remarkable progress in recent years. This review summarizes recent advances in HENA-based electrocatalysts for energy-related applications and highlights the crucial role of rational structural design in enhancing their performance. It begins with an introduction to the fundamental concepts, physicochemical properties, and structural characterizations of HENAs. Then, we categorize state-of-the-art HENA electrocatalysts based on their dimensionality, with particular emphasis on understanding their formation mechanisms at the nanoscale and atomic-scale. Furthermore, we discuss the rational underlying the structural regulation of electronic structures, electrocatalytic properties, and functional mechanisms of HENAs in several key electrocatalytic reactions. Finally, we outline the remaining challenges and future perspectives in this field, aiming to inspire the development of more advanced HENA-based catalysts to touch the ceiling of electrocatalytic activity and stability.

合金化一直被认为是设计高性能金属基电催化剂最有前途的策略之一。然而，传统合金中可用元素种类的有限限制了金属催化剂表面电子结构的连续调谐。高熵纳米合金（HENAs）以其不同的组成和结构特征，为克服传统二元或三元合金的局限性提供了一条途径，为反应中间体提供更接近最佳的吸附/解吸能。因此，HENAs已成为各种可再生能源技术（如燃料电池、水电解槽等）中不可或缺的电催化反应的有希望的候选者，并在近年来取得了显着进展。本文综述了基于hena的电催化剂在能源相关应用方面的最新进展，并强调了合理的结构设计在提高其性能方面的关键作用。首先介绍了HENAs的基本概念、物理化学性质和结构特征。然后，我们根据其尺寸对最先进的HENA电催化剂进行了分类，特别强调了在纳米尺度和原子尺度上对其形成机制的理解。此外，我们还讨论了HENAs在几个关键的电催化反应中的电子结构、电催化性能和功能机理的结构调控的合理性。最后，我们概述了该领域存在的挑战和未来的前景，旨在激发更先进的hena基催化剂的开发，以触及电催化活性和稳定性的天花板。

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引用次数: 0

Intrinsic photothermal performance and flexibility of polyurethane phase change materials via π-π conjugation for personal thermal management in outdoor cold environments 基于π-π共轭的聚氨酯相变材料在室外低温环境下的固有光热性能和柔性

IF 9.7 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today Physics

Pub Date : 2026-02-01 Epub Date: 2026-02-06 DOI: 10.1016/j.mtphys.2026.102039

Wenxing Luo , Minming Zou , Jue Wang , Yan Ma , Xiaowu Hu , Wenjing Chen , Xiongxin Jiang , Qinglin Li

Phase change materials (PCMs) with photothermal properties can effectively convert solar energy into thermal energy and store it via phase change, subsequently provide heat for human body in cold environments. The introduction of photothermal fillers into polyurethane PCMs to develop photothermal polyurethane PCMs has been widely studied. However, the incompatibility between photothermal fillers and matrix leads to severe deterioration in the composite's flexibility. Therefore, achieving both the mechanical and photothermal properties of polyurethane PCM in wearable products is a pressing issue. In this work, a polyurethane PCM with intrinsic flexibility and photothermal properties was designed. It consists of small molecules filled with π-π conjugated structures and polyethylene glycol crosslinked through chemical interactions. By selecting diamine crosslinkers with varying conjugation strengths, the influence of π-π conjugation on flexibility and photothermal properties of polyurethane PCM was investigated. The results demonstrate that the stronger the π-π conjugation, the better the photothermal performance, with a photothermal conversion efficiency reaching up to 71.4%. Additionally, the strong intermolecular forces generated by π-π stacking also endow polyurethane PCM with high-temperature morphological stability, high tensile strength (22.4 MPa), and excellent toughness (351.1 MJ/m³). The intrinsic photothermal properties and good mechanical performance of polyurethane PCM make it suitable as a material for fabrics and coatings, ideal for wearable products in extreme cold environments, such as north pole and snowfields, where thermal energy is required.

具有光热特性的相变材料可以有效地将太阳能转化为热能并通过相变储存，从而在寒冷环境中为人体提供热量。将光热填料引入聚氨酯聚丙烯酸树脂中，开发光热聚氨酯聚丙烯酸树脂得到了广泛的研究。然而，光热填料与基体之间的不相容性导致复合材料的柔韧性严重恶化。因此，在可穿戴产品中实现聚氨酯PCM的机械性能和光热性能是一个紧迫的问题。本文设计了一种具有固有柔韧性和光热性能的聚氨基甲酸乙酯PCM材料。它由充满π-π共轭结构的小分子和聚乙二醇通过化学相互作用交联而成。通过选择不同共轭强度的二胺交联剂，研究了π-π共轭对聚氨酯PCM柔韧性和光热性能的影响。结果表明，π-π共轭越强，光热性能越好，光热转换效率可达71.4%。此外，π-π堆积产生的强大分子间作用力也使聚氨酯PCM具有高温形态稳定性、高抗拉强度（22.4 MPa）和优异的韧性（351.1 MJ/m3）。聚氨酯PCM固有的光热性能和良好的机械性能使其适合作为织物和涂料的材料，非常适合在极端寒冷的环境中使用可穿戴产品，如北极和雪原，这些环境需要热能。

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引用次数: 0

Unveiling the governing factors of phonon transport across monolayer WS2 and WSe2 interfaces 揭示声子跨单层WS2和WSe2界面输运的控制因素

IF 9.7 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today Physics

Pub Date : 2026-02-01 Epub Date: 2026-01-12 DOI: 10.1016/j.mtphys.2026.102016

Yijie Chen , Chunwei Zhang , Tong Wang , Guojun Li , Jiahui Lou , Qun Cao , Cheng Shao , Hongkun Li , Weidong Zheng

The group VI transition metal dichalcogenides (MoX₂ and WX₂, X = chalcogen) have attracted considerable interest for next-generation electronic devices owing to their unique physical properties. Although thermal transport across MoX₂ interfaces has been extensively investigated over the past decade, research on WX₂ interfaces remains limited, and large discrepancies in previous reports obscure the underlying mechanisms. In this work, we experimentally unveil the governing factors and the underlying mechanisms of phonon transport across WX₂ interfaces through measuring interfacial thermal conductance (G) of metal/WS₂(or WSe₂)/Al₂O₃ over the temperature (T) of 80–600 K using time-domain thermoreflectance (TDTR). We find that even for WS₂ grown by chemical vapor deposition, G of metal/WS₂/Al₂O₃ spreads in a wide range of 6.4–13.4 MW m⁻² K⁻¹ under room temperature. Through a detailed analysis of picosecond acoustic signals and a comparison of samples prepared under differing conditions, we experimentally demonstrate that the interfacial bonding strength, rather than the mismatch in phonon density of states, plays a decisive role in tuning G of WX₂ interfaces. Moreover, we observe that G of Al/WSe₂/Al₂O₃ exceeds the phonon radiation limit and increases substantially with T even beyond the Debye temperature. This suggests that inelastic phonon scattering should contribute significantly to the G of WSe₂ interfaces. Our work fills the gap in experimental data on thermal conductance for WX₂ interfaces and offers valuable insights into the underlying thermal transport physics in such systems.

第六族过渡金属二硫族化合物（MoX2和WX2， X=chalcogen）由于其独特的物理性质，在下一代电子器件中引起了相当大的兴趣。尽管在过去的十年中，人们对MoX2界面上的热传递进行了广泛的研究，但对WX2界面的研究仍然有限，而且之前的报道中存在很大的差异，从而模糊了潜在的机制。在这项工作中，我们利用时域热反射（TDTR），通过测量金属/WS2（或WSe2）/Al2O3在80至600 K温度(T)下的界面热导率(G)，实验揭示了声子在WX2界面上传输的控制因素和潜在机制。我们发现，即使是化学气相沉积生长的WS2，在室温下，金属/WS2/Al2O3的G分布在6.4 ~ 13.4 MW m-2 K-1的范围内。通过对皮秒声信号的详细分析和不同条件下制备的样品的比较，我们实验证明，界面键合强度而不是声子密度的不匹配，在WX2界面的G调谐中起决定性作用。此外，我们观察到Al/WSe2/Al2O3的G超过声子辐射极限，即使超过德拜温度，G也随着T的增加而大幅增加。这表明非弹性声子散射对WSe2界面的G有重要贡献。我们的工作填补了WX2界面热导实验数据的空白，并为此类系统的潜在热输运物理提供了有价值的见解。

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引用次数: 0

Light propagation and heat conduction across multilayered structures in pump-probe thermoreflectance 泵-探针热反射中多层结构的光传播和热传导

IF 9.7 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today Physics

Pub Date : 2026-02-01 Epub Date: 2026-01-13 DOI: 10.1016/j.mtphys.2026.102018

Xinhang Guo , Haobo Yang , Yuhan Yao , Te-Huan Liu , Ronggui Yang , Xin Qian

Coupled transport of light and heat in multilayered nanostructures is pivotal for accurate pump-probe thermal characterizations. Conventional thermoreflectance measurements involve a transducer film deposited onto the sample surface, and the optical heating is typically treated as a surface heat flux. However, sensitive in-plane thermal conductivity measurements and nonintrusive characterizations require optically thin transducers or even the removal of transducers. Despite the recent advances in transducerless thermoreflectance techniques, the modeling of light absorption and heat generation involves simplifications that limit their application to a few specific cases, such as bulk absorptive materials or absorptive thin films on transparent substrates. In this work, we derive an optothermal transfer matrix formalism that enables unified analysis of propagation and absorption of light, generation and conduction of heat, as well as the multilayer thermoreflectance effects. The thermal conductivity could be severely underestimated if the surface heating model is naively used when the light can penetrate across the top layer. Based on the coupled optothermal transfer matrix model, thermal conductivity can be robustly measured for the three following cases: (a) bulk samples coated with optically thin metal transducer films in which the surface heat flux boundary condition breaks down; (b) absorptive semiconductor film on transparent substrates where the thermoreflectance cannot be regarded as a surface effect; and (c) absorptive semiconductor film on absorptive substrates with multilayer absorption and thermoreflectance effects. This work enables the use of ultrathin transducer layers and convenient modeling of coupled light propagation and heat conduction in multilayered structures and devices.

光和热在多层纳米结构中的耦合输运是精确的泵-探针热表征的关键。传统的热反射测量包括将传感器薄膜沉积在样品表面，并且光学加热通常被视为表面热通量。然而，灵敏的面内热导率测量和非侵入性表征需要光学薄的传感器，甚至需要去除传感器。尽管最近在无传感器热反射技术方面取得了进展，但光吸收和热产生的建模涉及简化，这限制了它们在少数特定情况下的应用，例如大块吸收材料或透明基板上的吸收薄膜。在这项工作中，我们推导了一个光热传递矩阵的形式，可以统一分析光的传播和吸收，热的产生和传导，以及多层热反射效应。当光可以穿透顶层时，如果天真地使用表面加热模型，则热导率可能被严重低估。基于耦合光热传递矩阵模型，可以对以下三种情况进行热导率的稳健测量：(a)大块样品涂覆了光学薄金属换能器薄膜，其表面热流密度边界条件失效；(b)透明衬底上的吸收性半导体薄膜，其中热反射率不能视为表面效应；(c)具有多层吸收和热反射效应的吸收基板上的吸收半导体膜。这项工作使得超薄换能器层的使用和在多层结构和器件中耦合光传播和热传导的方便建模成为可能。

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引用次数: 0

Wavelength-dependent photoresponse changes in graphene photodetectors induced by perovskite quantum dots 钙钛矿量子点诱导石墨烯光电探测器的波长相关光响应变化

IF 9.7 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today Physics

Pub Date : 2026-02-01 Epub Date: 2026-01-22 DOI: 10.1016/j.mtphys.2026.102031

Young Jun Noh , Minjin Kim , Gi Hun Nam , Akash Gupta , Kootak Hong , Dongguen Shin , Doojin Lee , Yong Il Park , Sang Hyun Lee

Understanding the mechanisms underlying photocurrent generation in graphene-based photodetectors is essential for enhancing their spectral selectivity and response stability. Therefore, this study aims to systematically investigate and compare the photoresponse mechanisms of pristine monolayer graphene and CsPbBr₃ quantum dot (QD)-sensitized graphene heterostructures under 450 nm and 525 nm laser irradiation. Pristine graphene exhibits a wavelength-dependent photoresponse, with a pronounced negative photocurrent (NPC) under 450 nm irradiation due to photodesorption of p-type dopants and defect-assisted photoionization from the SiO₂ substrate. Under 525 nm irradiation, where photon energy is insufficient to activate surface and substrate mechanisms, graphene exhibited an unstable positive photocurrent (PPC) driven by weak photoconduction. In contrast, the CsPbBr₃/graphene heterostructure consistently exhibits strong and stable PPC at wavelengths. The integration of CsPbBr₃ QD enables efficient photocarrier generation and transfer to the graphene channel, overriding parasitic NPC pathways and stabilizing the overall photoresponse. Time-resolved measurements reveals significantly faster rise and fall times in the heterostructure, confirming a transition from slow surface-mediated processes to rapid photoconductive dynamics. This comparative study elucidates how intrinsic graphene properties, substrate interactions, and heterojunction effects collectively drive the photocurrent polarity and enhance performance in hybrid 2D/0D photodetectors.

了解石墨烯基光电探测器中光电流产生的机制对于提高其光谱选择性和响应稳定性至关重要。因此，本研究旨在系统研究和比较原始单层石墨烯和CsPbBr3量子点（QD）敏化石墨烯异质结构在450 nm和525 nm激光照射下的光响应机制。原始石墨烯表现出波长依赖的光响应，由于p型掺杂剂的光解吸和SiO2衬底的缺陷辅助光电离，在450 nm照射下具有明显的负光电流（NPC）。在525 nm辐照下，光子能量不足以激活表面和衬底机制，石墨烯表现出不稳定的正光电流（PPC），由弱光导驱动。相比之下，CsPbBr3/石墨烯异质结构在波长上始终表现出强大而稳定的PPC。CsPbBr3 QD的集成实现了高效的光载流子生成和转移到石墨烯通道，覆盖了寄生NPC途径并稳定了整体光响应。时间分辨测量显示异质结构的上升和下降时间明显更快，证实了从缓慢的表面介导过程到快速光导动力学的转变。这项比较研究阐明了石墨烯的固有特性、衬底相互作用和异质结效应如何共同驱动光电流极性，并提高了混合2D/0D光电探测器的性能。

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引用次数: 0

Advanced thermoelectric cooling performance in BiTeSe alloys through composition tuning under dynamic melting fields 动态熔炼场下通过成分调整提高BiTeSe合金热电冷却性能

IF 9.7 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today Physics

Pub Date : 2026-02-01 Epub Date: 2026-01-19 DOI: 10.1016/j.mtphys.2026.102013

Tao Xiong , Chenhao Ren , Hailong He, Chunping Niu, Youqun Li, Feng Jiang, Yi Wu, Mingzhe Rong

N-type bismuth telluride-based materials are more sensitive to texturing, which often leads to limited electrical transport properties in samples fabricated via conventional hot-press processing routes. Although low thermal conductivity can be achieved, the insufficient electrical properties significantly restrict the further enhancement of the module's output power. Hence, we have innovatively introduced a rotary melting technique that utilizes a dynamic centrifugal field for microstructural control, thereby achieving co-optimization of both electrical conductivity and Seebeck coefficient in n-type Bi₂Te₃-based materials (PF = 40 μWcm⁻¹K⁻²). In addition, a substantial reduction in lattice thermal conductivity was successfully achieved, as full-spectrum phonon scattering centers were constructed by high densities of dislocations, twin boundaries, and linear nanoscale secondary phases. As a result, the peak and average values of zT for the Cu_0.002Bi₂Te_2.7Se_0.3 + 4 wt% Te sample were measured to be 1.2 and 1.13, respectively. A single-leg thermoelectric power generation module assembled with the optimized n-type material demonstrated a conversion efficiency of 5.1 % at ΔT = 200 K. Moreover, the TE cooling module, constructed using the n-type material in combination with a self-fabricated p-type material, achieved a temperature difference of 82 K at a hot-side temperature of 350 K. Both properties metrics surpass those of commercially available TE modules.

n型碲化铋基材料对变形更敏感，这通常导致通过传统热压加工路线制造的样品的电输运性能有限。虽然可以实现低导热性，但电性能的不足严重限制了模块输出功率的进一步增强。因此，我们创新地引入了一种利用动态离心场进行微结构控制的旋转熔化技术，从而实现了n型bi2te3基材料（PF = 40 μWcm−1K−2）的电导率和塞贝克系数的共同优化。此外，通过高密度的位错、孪晶界和线性纳米级二次相构建全谱声子散射中心，成功地实现了晶格导热系数的大幅降低。结果表明，Cu0.002Bi2Te2.7Se0.3 + 4 wt% Te样品的zT峰值和平均值分别为1.2和1.13。用优化的n型材料组装的单腿热电发电模块在ΔT = 200 K时的转换效率为5.1%。此外，使用n型材料与自制p型材料结合构建的TE冷却模块在热侧温度为350 K时实现了82 K的温差。这两个属性指标都超过了商用TE模块。

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引用次数: 0

Giant enhancement of near-field radiative heat transfer enabled by a finite-size waveguide 有限尺寸波导实现近场辐射传热的巨大增强

IF 9.7 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today Physics

Pub Date : 2026-02-01 Epub Date: 2026-01-15 DOI: 10.1016/j.mtphys.2026.102023

Kun Zhang , Zixue Luo , Jinlin Song , Qiang Cheng

Enhanced near-field radiative heat transfer (NFRHT), mediated by the waveguide modes, holds great promise for advanced thermal management and energy conversion. While extensive researches have focused on the infinite structures, the role of finite-size effect remains insufficiently unexplored. Here, we investigate the NFRHT between two nanoparticles above a finite-size rectangular waveguide, revealing a profound influence of the width of the waveguide on the heat transfer. Based on the fluctuating-surface current formulation and the boundary element method, we demonstrate that the enhancement factor exhibits a non-monotonic dependence on the width, peaking at a specific value, where the heat conductance can be enhanced by over two orders of magnitude compared to the vacuum case. This optimal enhancement is attributed to the strong coupling between the localized surface resonances (LSR) of the nanoparticles and the degenerate corner- and edge-modes (ss and sa modes) of the waveguide. Furthermore, we show that the shape of the nanoparticle is critical, with the sharp features (e.g., cubes, pyramids) enable a superior enhancement over the spherical nanoparticles, as their LSR frequencies align with the waveguide modes, facilitating a stronger coupling. The distances between nanoparticles and between nanoparticles and the waveguide are also key tuning parameters, with an identified inflection point in enhancement at d ≈ 2 μm linked to the finite propagation lengths of the waveguide modes. Our work provides fundamental insights into the manipulation of NFRHT via finite-size effects and mode engineering, with implications for the design of nanoscale thermal devices.

由波导模式介导的增强近场辐射传热（NFRHT）在先进的热管理和能量转换方面具有很大的前景。虽然大量的研究集中在无限结构上，但有限尺寸效应的作用尚未得到充分的探索。在这里，我们研究了有限尺寸矩形波导上两个纳米颗粒之间的NFRHT，揭示了波导宽度对传热的深刻影响。基于波动表面电流公式和边界元方法，我们证明了增强因子对宽度的非单调依赖性，在特定值处达到峰值，与真空情况相比，热传导可以增强两个数量级以上。这种最佳增强归因于纳米颗粒的局部表面共振（LSR）与波导的简并角模式和边缘模式（ss和sa模式）之间的强耦合。此外，我们表明纳米颗粒的形状是至关重要的，具有尖锐特征（例如立方体，金字塔）的纳米颗粒比球形纳米颗粒具有更好的增强，因为它们的LSR频率与波导模式对齐，从而促进了更强的耦合。纳米粒子之间的距离以及纳米粒子与波导之间的距离也是关键的调谐参数，在d≈2 μm处的增强拐点与波导模式的有限传播长度有关。我们的工作通过有限尺寸效应和模式工程为NFRHT的操纵提供了基本的见解，对纳米级热器件的设计具有指导意义。

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引用次数: 0

Research progress of BaTiO3-based ferroelectric memristors for artificial synapse and neuromorphic computing 人工突触和神经形态计算用batio3基铁电记忆电阻器的研究进展

IF 9.7 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today Physics

Pub Date : 2026-02-01 Epub Date: 2026-01-20 DOI: 10.1016/j.mtphys.2026.102027

Fan Ye , Fei Liang , Jian-Wei Zhong , Guan-Ling Li , Xin-Gui Tang

Due to the traditional von Neumann architecture, computing power is regarded as one of the key constraints in the era of artificial intelligence (AI). The use of non-volatile ferroelectric memristors to simulate the characteristics of biological synapses has been validated as a viable approach for mimicking the human brain's execution of large-scale complex computational tasks. The neuromorphic computing potential of various emerging materials and devices has attracted widespread research interest. Among these, BaTiO₃, a ferroelectric perovskite, is an ideal candidate due to its distinct advantages and exceptional performance. In this paper, the recent research progress on BaTiO₃-based ferroelectric memristors is reviewed, including ferroelectric tunnel junctions (FTJs) and ferroelectric diodes (FDs). And the optimization schemes for synaptic behavior of the corresponding devices are discussed. Finally, the efficient application of two neural network architectures based on artificial neural networks (ANNs) and convolutional neural networks (CNNs) is introduced, illuminating the development prospects for next-generation BaTiO₃-based memristive artificial intelligence.

由于传统的冯·诺依曼架构，计算能力被视为人工智能时代的关键制约因素之一。使用非易失性铁电记忆电阻器来模拟生物突触的特性已被验证为模拟人类大脑执行大规模复杂计算任务的可行方法。各种新兴材料和器件的神经形态计算潜力引起了广泛的研究兴趣。其中，铁电钙钛矿BaTiO3因其独特的优势和卓越的性能而成为理想的候选者。本文综述了近年来基于batio3的铁电忆阻器的研究进展，包括铁电隧道结（ftj）和铁电二极管（fd）。并讨论了相应器件的突触行为优化方案。最后，介绍了基于人工神经网络（ann）和卷积神经网络（cnn）两种神经网络架构的高效应用，展望了下一代基于batio3的记忆性人工智能的发展前景。

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引用次数: 0

Exploring the structural evolution of the NdFeB magnets with various carbon contamination in the PIM process 探讨不同碳污染的钕铁硼磁体在PIM过程中的结构演变

IF 9.7 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today Physics

Pub Date : 2026-02-01 Epub Date: 2026-01-20 DOI: 10.1016/j.mtphys.2026.102026

T. Crozier-Bioud , S. Jouen , S. Rolere , V. Nachbaur , M. Ollivier , L. Favergeon , S. Luca

The Powder Injection Molding (PIM) process offers the possibility to obtain dense near-net shape NdFeB parts with magnetic properties similar to the conventional powder metallurgy counterparts. Understanding the structural evolution of the magnets with various carbon contamination coming from the organic binders will offer the possibility to improve the process. Here, the evolution of the structure of the NdFeB magnets with various carbon contamination within the PIM process was investigated. It was found that the carbon contaminates the Nd-rich phases forming a NdO_xC_y phase. For carbon concentrations higher than 5300 ppm wt., a tetragonal neodymium carbide phase was formed at the expense of the metallic Nd-dhcp phase. Moreover, 23 % of boron atoms are substituted in the main Nd₂Fe₁₄B magnetic phase, forming a Nd₂Fe₁₄B_0.77C_0.23 phase.

粉末注射成型（PIM）工艺提供了获得致密的近净形状钕铁硼零件的可能性，其磁性能与传统粉末冶金产品相似。了解来自有机粘合剂的各种碳污染的磁体的结构演变将为改进该工艺提供可能性。本文研究了PIM过程中不同碳污染下钕铁硼磁体的结构演变。发现碳污染了富nd相，形成了NdOxCy相。当碳浓度高于5300 ppm wt时，形成四方的碳化钕相，而金属Nd-dhcp相则被破坏。此外，23%的硼原子被取代在Nd2Fe14B主磁相中，形成Nd2Fe14B0.77C0.23相。

引用次数: 0

Supramolecular polymer-guided functionalization of rhenium diselenide nanosheets: Hierarchical Co-assembly and advanced performance 二硒化铼纳米片的超分子聚合物引导功能化：分层共组装和先进性能

IF 9.7 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today Physics

Pub Date : 2026-02-01 Epub Date: 2026-02-03 DOI: 10.1016/j.mtphys.2026.102041

Tse-Hsin Lo , Ching-Hwa Ho , Wei-Tsung Chuang , Chih-Ping Chen , Chih-Chia Cheng

Rhenium diselenide (ReSe₂), a two-dimensional nanomaterial with excellent physical properties, holds potential for various applications. However, its performance and sustainability are severely limited by structural inhomogeneity, low electrical conductivity, and instability at high temperatures. We present an innovative approach to enhance its physical properties by combining ReSe₂ with an adenine-functionalized supramolecular polymer (AJ) to co-assemble a novel supramolecular composite system. Due to the strong affinity between the adenine groups in AJ and ReSe₂ crystals, AJ polymer chains securely attach to the ReSe₂ surface and self-assemble into hexagonal and lamellar nanostructures, which promotes stable exfoliation of ReSe₂ nanosheets and enhances the overall structural stability of the composites. Exfoliated ReSe₂ nanosheets exhibit many promising physical properties, including controllable layer number, uniform micron-sized thin nanosheet structures, distinct microscopic morphologies, and highly stable thermally reversible phase transitions and rheological behavior. Importantly, these composites exhibit significantly lower resistance and stable conductive performance compared to bulk ReSe₂ in electrochemical impedance and single-layer device evaluations, and enabled stable current conduction in devices. This newly developed system demonstrates the potential of supramolecular polymers to regulate the material properties of ReSe₂ and opens new opportunities for optoelectronics, semiconductors, and advanced technologies.

二硒化铼（ReSe2）是一种具有优异物理性能的二维纳米材料，具有广泛的应用前景。然而，其性能和可持续性受到结构不均匀性、低导电性和高温不稳定性的严重限制。我们提出了一种创新的方法，通过将ReSe2与腺嘌呤功能化的超分子聚合物（AJ）结合来共同组装一种新的超分子复合体系，以增强其物理性能。由于AJ和ReSe2晶体中的腺嘌呤基团之间具有很强的亲和力，AJ聚合物链可以安全地附着在ReSe2表面并自组装成六边形和片层状纳米结构，从而促进了ReSe2纳米片的稳定剥离，增强了复合材料的整体结构稳定性。剥离后的ReSe2纳米片具有许多有前途的物理性质，包括可控的层数、均匀的微米级薄纳米片结构、独特的微观形貌、高度稳定的热可逆相变和流变行为。重要的是，与本体ReSe2相比，这些复合材料在电化学阻抗和单层器件评估中表现出明显更低的电阻和稳定的导电性能，并使器件中的电流传导稳定。这个新开发的系统展示了超分子聚合物调节ReSe2材料特性的潜力，并为光电子、半导体和先进技术开辟了新的机会。

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