Applied Surface Science最新文献

Three-level gradient design for high-performance waterborne sodium silicate wood coatings and the interfacial bonding mechanism 高性能水性硅酸钠木器涂料的三级梯度设计及界面结合机理

IF 6.9 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science

Pub Date : 2026-06-01 Epub Date: 2026-02-08 DOI: 10.1016/j.apsusc.2026.166216

Yu Cheng , Yang Zou , Ping Li , Hao Wu , Yiqiang Wu , Yingfeng Zuo

To address the limitations of conventional sodium silicate coatings—high water solubility, poor adhesion, and single functionality, this study introduces a three-stage gradient strategy of “molecular bridging-micropore filling-functional coupling.” Using a sodium silicate solution as the base material, a sodium silicate-polyvinyl alcohol composite coating was prepared via organic–inorganic hybridization. Further, the modified coating was strengthened by introducing nano-SiO₂ modified with silane coupling agent KH550, thus constructing a high-performance water-based composite coating system. Results show that through the molecular regulation of KH550, spatial orientation of its organic and inorganic ends is achieved, effectively suppressing nano-SiO₂ agglomeration and establishing a molecular-level connection at the wood-coating interface; Nano-SiO₂ fill coating micropores, significantly increasing cross-linking density and mechanical properties; Through the synergistic effect of the Nano-SiO₂/PVA/2NH₂-PDMS composite system, a “rigid Si-O-Si and type siloxane” dual-network structure is constructed, addressing the shortcomings of traditional coatings being hard and brittle; The composite exhibits outstanding performance: enhanced mechanical properties (wear resistance: 0.083 g/r, hardness: 6H), adhesion meeting Grade 1 standard, essentially no residual contamination from cola, soy sauce, or sesame oil, and rapid, smokeless self-extinguishment. It fully meets application requirements in furniture, interior decoration, and construction, offering a new approach for high-value utilization of bio-based materials.

为了解决传统硅酸钠涂层水溶性高、附着力差、功能单一的局限性，本研究引入了“分子桥接-微孔填充-功能耦合”的三阶段梯度策略。以硅酸钠溶液为基材，通过有机-无机杂化法制备了硅酸钠-聚乙烯醇复合涂层。通过引入硅烷偶联剂KH550改性的纳米sio2对改性涂层进行强化，构建了高性能的水基复合涂层体系。结果表明：通过对KH550的分子调控，实现了其有机端和无机端空间取向，有效抑制了纳米sio2团聚，并在木漆界面处建立了分子水平的连接；纳米sio2填充涂层微孔，显著提高交联密度和力学性能；通过纳米sio2 /PVA/2NH2-PDMS复合体系的协同作用，构建了“刚性Si-O-Si -型硅氧烷”双网络结构，解决了传统涂料硬脆的缺点；该复合材料具有优异的性能：增强的机械性能（耐磨性：0.083 g/r，硬度：6H），附着力达到一级标准，基本上没有可乐，酱油或香油的残留污染，快速，无烟自熄。完全满足家具、室内装饰、建筑等领域的应用需求，为生物基材料的高价值利用提供了一条新途径。

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引用次数: 0

Toward revealing chemical structure defects accompanied with surface geometrical defects in KH2PO4 optics processed by single point diamond turning 揭示单点金刚石车削加工的KH2PO4光学材料中伴随表面几何缺陷的化学结构缺陷

IF 6.9 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science

Pub Date : 2026-06-01 Epub Date: 2026-02-08 DOI: 10.1016/j.apsusc.2026.166255

Guang Chen , Yibo Liu , Jianchong Li , Jian Cheng , Jixiang Chen , Hongqin Lei , Linjie Zhao , Mingjun Chen

Functional KH₂PO₄ optics are typically processed by single-point diamond turning (SPDT). Surface defects, including geometrical defects and accompanied chemical structure defects (CSDs), introduced by SPDT will significantly diminish laser damage resistance of KH₂PO₄ optics. Current research primarily focuses on the geometrical features of surface defects and their laser-induced damage mechanisms. However, laser damage mainly occurs in the local tiny areas (e.g., brittle crack tip) of surface defects, indicating that CSDs (e.g., oxygen vacancies, lattice damage) at these areas violently absorb incident laser and cause laser damage. Therefore, accurately characterizing these CSDs is vital for assessing the laser performance of KH₂PO₄ optics. A multi-modal characterization method combining Raman, infrared, and photoluminescence spectroscopy was developed in this study to reveal the atomic/molecular-scale structural features of the CSDs. Firstly, we conducted a statistical analysis of surface defects on KH₂PO₄ optics processed by SPDT. These surface defects were classified into three categories (protrusion defects, brittle defects, and plastic scratches) based on their geometric features. Then, elemental analysis indicated that protrusion defects contained significantly higher oxygen content (about 5%) compared to the other defect types. Secondly, the lattice structure at the molecular scale was examined using combined Raman and infrared spectroscopy, revealing that plastic scratches caused negligible lattice damage, whereas the other two defect types led to substantial crystal lattice degradation. Finally, atomic-level point defects were characterized using optical fiber confocal fluorescence. The results showed significant variations in oxygen vacancy content among the three defect types, with this point defect serving as a critical indicator for identifying defect characteristics. This study established a multi-modal characterization methodology for SPDT-induced surface defects, offering technical support for high-performance manufacturing and performance enhancement of KDP optics.

功能性KH2PO4光学器件通常通过单点金刚石车削（SPDT）进行加工。SPDT引入的表面缺陷，包括几何缺陷和伴随的化学结构缺陷（CSDs），将显著降低KH2PO4光学器件的抗激光损伤能力。目前的研究主要集中在表面缺陷的几何特征及其激光损伤机制上。然而，激光损伤主要发生在表面缺陷的局部微小区域（如脆性裂纹尖端），说明这些区域的CSDs（如氧空位、晶格损伤）剧烈地吸收入射激光并造成激光损伤。因此，准确表征这些CSDs对于评估KH2PO4光学器件的激光性能至关重要。本研究开发了一种结合拉曼光谱、红外光谱和光致发光光谱的多模态表征方法，以揭示CSDs的原子/分子尺度结构特征。首先，我们对SPDT处理的KH2PO4光学器件表面缺陷进行了统计分析。根据表面缺陷的几何特征，将其分为突出缺陷、脆性缺陷和塑性划痕三大类。然后，元素分析表明，与其他缺陷类型相比，突出缺陷的氧含量明显较高（约5%）。其次，利用拉曼光谱和红外光谱对分子尺度上的晶格结构进行了检测，发现塑料划痕对晶格的破坏可以忽略不计，而其他两种缺陷类型则会导致晶格的严重退化。最后，利用光纤共聚焦荧光对原子级点缺陷进行了表征。结果表明，三种缺陷类型的氧空位含量存在显著差异，这一点缺陷可以作为识别缺陷特征的关键指标。本研究建立了spdt诱导表面缺陷的多模态表征方法，为高性能制造和提高KDP光学器件的性能提供了技术支持。

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引用次数: 0

Insights into the enhanced oxidation resistance of Incoloy 800H coating prepared via Electro-spark deposition 电火花沉积法制备铬合金800H涂层增强抗氧化性能的研究

IF 6.9 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science

Pub Date : 2026-06-01 Epub Date: 2026-02-08 DOI: 10.1016/j.apsusc.2026.166227

Junjie Chen , Zhou Zhao , Chengtao Li , Hao Liu , Jing Wan , Zhanpeng Lu , Sergio Lozano-Perez , Hannu Hänninen

An Incoloy 800H coating was deposited on AISI 316L stainless steel (SS) via Electro-spark Deposition (ESD) to improve high-temperature steam oxidation resistance. ESD induced a unique non-equilibrium microstructure featuring refined columnar grains, a high fraction of low-angle grain boundaries (LAGBs) and random high-angle grain boundaries (RHAGBs), and significant compressive residual stress. This contrasts with the equiaxed grains and tensile stress in bulk Incoloy 800H and AISI 316L SS. During 650 °C/500 h steam oxidation, the ESD Incoloy 800H coating demonstrated superior oxidation resistance. It formed an ultra-thin oxide film, approximately 50 times thinner than the thick, Fe-rich oxides (hematite/magnetite) observed on the bulk AISI 316L and Incoloy 800H. A composite protective oxide film formed on the coating: an outer Cr-rich layer (Cr₂O₃ and (Mn, Ni)Cr₂O₄ spinel) and a critical inner, semicontinuous layer of SiO₂ and Al₂O₃ at the interface of oxide/metal. This exceptional performance is due to a synergistic protection mechanism. The high density of LAGBs/RHAGBs with high diffusivity provided rapid diffusion pathways, accelerating Si and Al transport and favoring the formation of the semicontinuous inner barrier layer, which stabilized the outer Cr-rich oxide film. The ESD-induced compressive stress benefited the stability and adhesion of the protective oxide film.

采用电火花沉积（ESD）技术在AISI 316L不锈钢表面沉积了一层incoly 800H涂层，以提高其耐高温蒸汽氧化性。静电放电诱导了独特的非平衡微观结构，包括细化的柱状晶粒，高比例的低角晶界（LAGBs）和随机的高角晶界（RHAGBs），以及显著的压残余应力。这与大块铬合金800H和AISI 316L SS的等轴晶粒和拉伸应力形成对比。在650°C/500 h蒸汽氧化过程中，ESD铬合金800H涂层表现出优异的抗氧化性。它形成了一层超薄的氧化膜，大约比在大块AISI 316L和incoly 800H上观察到的厚的富铁氧化物（赤铁矿/磁铁矿）薄50倍。涂层上形成了复合保护氧化膜：外层是富cr层（Cr2O3和（Mn, Ni）Cr2O4尖晶石），内部是氧化物/金属界面处的临界半连续SiO2和Al2O3层。这种卓越的性能是由于协同保护机制。具有高扩散率的高密度LAGBs/RHAGBs提供了快速的扩散途径，加速了Si和Al的输运，有利于形成半连续的内阻挡层，从而稳定了外层富cr氧化膜。静电引起的压应力有利于保护氧化膜的稳定性和附着力。

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引用次数: 0

Tetra-coordinated Mo(V)4c species promoted highly selective oxidation of methanol under mild conditions 四配位Mo(V)4c在温和条件下促进了甲醇的高选择性氧化

IF 6.9 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science

Pub Date : 2026-06-01 Epub Date: 2026-02-02 DOI: 10.1016/j.apsusc.2026.166175

Jiacang Liang , Ronghua Liu , Xiaqing Wang , Xiujuan Gao , Xiaoxing Wang , Yingquan Wu , Faen Song , Yizhuo Han , Qingde Zhang

The selective oxidation of C–H bonds in methanol to high-valued oxygenates under mild conditions is a vital route for methanol utilization. The molybdenum-based catalysts containing Mo⁵⁺ species exhibit outstanding ability to activate C–H bonds. However, the precise identification of the active Mo⁵⁺ species structure and its catalytic mechanism in the methanol oxidation reaction remain incompletely elucidated. Herein, this work constructed MoO_x nanolayers with monolayer or submonolayer thickness over the tin oxide surface. Through the combination of ultraviolet–visible diffuse reflectance spectroscopy (UV–Vis DRS), X-ray photoelectron spectroscopy (XPS), and low-temperature electron spin resonance (ESR), supplemented by carefully designed control experiments, it is confirmed that the Mo(V)_4c species serve as one of the key active sites for the highly selective oxidation of methanol under mild conditions. Molybdenum species located at the Mo(V)_4c site significantly promote the adsorption and activation of methanol while facilitating the directional conversion of reaction intermediates. The catalyst containing high-concentration Mo(V)_4c species achieves a methyl formate (MF) selectivity of 95.8% and a methanol conversion of 14.7%.

甲醇中C-H键在温和条件下选择性氧化生成高值氧合物是甲醇利用的重要途径。含Mo5+的钼基催化剂表现出较好的活化C-H键的能力。然而，活性Mo5+结构的精确鉴定及其在甲醇氧化反应中的催化机理尚未完全阐明。本文在氧化锡表面构建了具有单层或亚单层厚度的MoOx纳米层。通过紫外-可见漫反射光谱（UV-Vis DRS）、x射线光电子能谱（XPS）和低温电子自旋共振（ESR）相结合，并结合精心设计的对照实验，证实了Mo(V)4c是温和条件下甲醇高选择性氧化的关键活性位点之一。位于Mo(V)4c位点的钼种显著促进了甲醇的吸附和活化，同时促进了反应中间体的定向转化。含高浓度Mo(V)4c的催化剂对甲酸甲酯（MF）的选择性为95.8%，甲醇转化率为14.7%。

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引用次数: 0

The dual role of trace Cu in the corrosion mechanism of Zn4Al alloy: Insights from microstructural characterization and electrochemical performance 微量Cu在Zn4Al合金腐蚀机制中的双重作用：来自微观结构表征和电化学性能的见解

IF 6.9 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science

Pub Date : 2026-06-01 Epub Date: 2026-02-08 DOI: 10.1016/j.apsusc.2026.166263

Hongxin Zhang , Hainan Wang , Chenfeng Pan , Wei Jian , Lu Ren

Zn alloys are valued in casting for their low melting point, excellent casting performance, and dimensional stability. Zn-Al-Cu alloys offer outstanding mechanical properties, yet their corrosion behavior remains insufficiently studied. This work investigates the corrosion behavior of Zn4Al and Zn4Al0.5Cu alloys in 3.5 wt% NaCl solution, revealing changes in their microstructure and corrosion mechanisms. Results show that trace Cu addition refines the microstructure without forming Cu-related intermetallic compound, but creates significant potential difference between Cu-rich regions and the surrounding matrix. Polarization curves indicate the corrosion current density of Zn4Al0.5Cu (46.533 μA/cm²) is notably higher than Zn4Al (21.638 μA/cm²). In the electrochemical impedance spectrum, Zn4Al0.5Cu exhibits inductive behavior, confirming enhanced micro-galvanic effects. Electrochemical noise demonstrates that the localized corrosion growth probability of Zn4Al0.5Cu is suppressed at the early stage due to eutectic refinement. However, with prolonged exposure, insufficient stability of the corrosion product layer leads to the reinitiation of localized corrosion. Overall, the galvanic corrosion and corrosion product layer instability induced by Cu primarily contribute to reduced anti-corrosive properties. This study elucidates the dual role of trace Cu in the corrosion mechanism of Zn4Al alloy, offering a new theoretical foundation for the engineering application of Zn–based protective materials in corrosive environments.

锌合金因其熔点低、铸造性能好、尺寸稳定等优点而在铸造中受到重视。Zn-Al-Cu合金具有优异的力学性能，但对其腐蚀行为的研究还不够充分。研究了Zn4Al和Zn4Al0.5Cu合金在3.5 wt% NaCl溶液中的腐蚀行为，揭示了它们的组织变化和腐蚀机理。结果表明，微量Cu的加入细化了合金的微观结构，但没有形成与Cu相关的金属间化合物，但在富Cu区和周围基体之间产生了显著的电位差。极化曲线表明，Zn4Al0.5Cu的腐蚀电流密度（46.533 μA/cm2）明显高于Zn4Al（21.638 μA/cm2）。在电化学阻抗谱中，Zn4Al0.5Cu表现出感应行为，证实了微电效应的增强。电化学噪声表明，由于共晶细化，Zn4Al0.5Cu的局部腐蚀生长概率在早期被抑制。然而，随着暴露时间的延长，腐蚀产物层的稳定性不足导致局部腐蚀的重新开始。总体而言，Cu引起的电偶腐蚀和腐蚀产物层不稳定是导致抗腐蚀性能下降的主要原因。本研究阐明了微量Cu在Zn4Al合金腐蚀机理中的双重作用，为锌基防护材料在腐蚀环境中的工程应用提供了新的理论基础。

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引用次数: 0

Microstructural evolution and hot corrosion mechanisms of a TiAl-based alloy exposed to pure and mixed molten salt systems Ti45Al8Nb合金在纯熔盐和混合熔盐体系中的组织演变及热腐蚀机理

IF 6.9 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science

Pub Date : 2026-06-01 Epub Date: 2026-02-09 DOI: 10.1016/j.apsusc.2026.166274

Xueqing Wang , Tingrui Xu , Dijuan Han , Rui Hou , Zhixiang Qi , Yuede Cao , Guang Chen

Hot corrosion significantly impacts the service life of TiAl-based components in aero-engine environments. In this work, the hot corrosion behavior of Ti45Al8Nb alloy is systematically and comparatively investigated when exposed to molten Na₂SO₄ at 900 °C and molten Na₂SO₄–NaCl (75:25 wt%) at 700–900 °C. Under identical experimental conditions, the mixed-salt environment causes markedly higher material loss, severe scale spallation, and intensified microstructural damage compared with pure Na₂SO₄, and the corrosion severity exhibits a strong temperature dependence. In pure Na₂SO₄, a relatively compact multilayer corrosion scale composed of Ti-, Al-, and Nb-rich phases develops, in which Nb promotes stratified oxide formation that suppresses inward diffusion of corrosive species. In contrast, in the NaCl-containing environment, Cl⁻ ions trigger chlorine-induced self-sustaining reactions at the metal–scale interface, reducing scale adherence and accelerating degradation. Meanwhile, Nb participates in the acidic dissolution of Al₂O₃, while sulfur species contribute to internal sulfidation, primarily through TiS formation, leading to enhanced pit nucleation and deepening. These mechanisms collectively destabilize the corrosion scale, intensify intergranular attack, and result in a significantly higher degradation rate.

热腐蚀严重影响航空发动机中钛合金部件的使用寿命。本文系统、比较地研究了Ti45Al8Nb合金在900 °C熔融Na2SO4和700-900 °C熔融Na2SO4 - nacl（75:25 wt%）下的热腐蚀行为。在相同的实验条件下，与纯Na2SO4相比，混合盐环境导致的材料损失量明显增加，水垢剥落严重，微结构损伤加剧，腐蚀严重程度表现出较强的温度依赖性。在纯Na2SO4中，形成由富Ti、富Al和富Nb相组成的相对致密的多层腐蚀层，其中Nb促进层状氧化物的形成，抑制腐蚀性物质向内扩散。相比之下，在含nacl环境中，Cl−离子在金属尺度界面引发氯诱导的自维持反应，减少了尺度粘附并加速了降解。同时，Nb参与了Al2O3的酸性溶解，而硫种主要通过ti的形成参与了内部硫化，导致坑形核增强和加深。这些机制共同破坏了腐蚀规模的稳定，加剧了晶间侵蚀，并导致了明显更高的降解率。

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引用次数: 0

Constructed WS2-TiO2 model for robust interfacial charge transfer modulation via facet-dependent strategy 基于面相关策略构建WS2-TiO2界面电荷转移调制模型

IF 6.9 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science

Pub Date : 2026-06-01 Epub Date: 2026-02-08 DOI: 10.1016/j.apsusc.2026.166247

Yue Xing , Jianxin Hua , Wenzhe Fu , Miaomiao Xiang , Chenxi Huang , Kai Wu , Xiang Shao

Regulating interfacial charge transfer is vital for the optoelectronic and photocatalytic applications of semiconductive heterostructures consisting of transition metal dichalcogenides (TMDCs) and transitional metal oxides (TMOs). This process typically relies on external field modulation and materials design. However, limited synthetic approaches and microscopic investigations have hindered the fundamental understanding of facet-dependent effects in TMDCs/TMO. In this study, we have fabricated the high-quality WS₂/TiO₂ model system, combining monolayer WS₂ nanosheets on atomically flat rutile TiO₂ single-crystal substrates with distinct facets through a chemical vapor deposition (CVD) method. Photoluminescence (PL) spectroscopy shows that the excitonic response of WS₂ is facet-dependent, with A⁰/A⁻ exciton ratio decreasing in the order (1 0 0) > (1 1 0) > (1 1 1) > (0 0 1), indicating that charge transfer follows the evolution of crystallographic orientation. Kelvin probe force microscopy (KPFM) reveals the same sequence in interfacial electric fields, reflecting facet-dependent charge-transfer efficiency. Under ultraviolet illumination, the surface-potential dynamics further demonstrate enhanced interfacial charge transfer. A similar interfacial charge transfer regulation process has been further extended to the MoS₂/TiO₂ system. These findings underline the oxide facet engineering as a potential strategy for optimizing the interfacial effect in TMDCs/TMO heterostructures, which also paves the way for their applications in energy conversion and catalysis.

调节界面电荷转移对于过渡金属二硫族化合物（TMDCs）和过渡金属氧化物（TMOs）组成的半导体异质结构的光电和光催化应用至关重要。这一过程通常依赖于外场调制和材料设计。然而，有限的合成方法和微观研究阻碍了对TMDCs/TMO中面依赖性效应的基本理解。在这项研究中，我们通过化学气相沉积（CVD）方法，将单层WS2纳米片结合在具有不同表面的金红石型TiO2单晶衬底上，制备了高质量的WS2/TiO2模型体系。光致发光（PL）光谱显示WS2的激子响应是面相关的，A0/A−激子比依次递减，顺序为（1 0 0）> (1 1 0 0) > (1 1 1) >(0 0 0 1)，表明电荷转移遵循晶体取向的演化。开尔文探针力显微镜（KPFM）在界面电场中显示了相同的序列，反映了面相关的电荷转移效率。在紫外线照射下，表面电位动力学进一步证明了界面电荷转移的增强。类似的界面电荷转移调节过程进一步扩展到MoS2/TiO2体系。这些发现强调了氧化面工程作为优化TMDCs/TMO异质结构界面效应的潜在策略，也为其在能量转换和催化方面的应用铺平了道路。

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引用次数: 0

Kinetic engineering for the robust synthesis of Au nanocubes in cetylpyridinium chloride (CPC) system 十六烷基氯化吡啶（CPC）体系中稳健合成金纳米立方的动力学工程

IF 6.9 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science

Pub Date : 2026-06-01 Epub Date: 2026-02-11 DOI: 10.1016/j.apsusc.2026.166295

Chi Li, Yanan Jin, Fangfang Ding, Mingyuan Dong, Shuang Lin, Li Wang, Xiang Lin

Au nanocubes have emerged as highly promising nanostructure because of their strong and tunable LSPR properties. However, the direct synthesis of Au nanocubes with improved corner sharpness and yield is still changeling. In this work, a robust synthesis strategy in cetylpyridinium chloride (CPC) system for Au nanocubes with high sharpness and yield is proposed without any purification process. Importantly, the synthesis of Au nanocubes is insensitive to the concentration of both ascorbic acid (AA) and Br^- ions under the CPC system, which is conducive to the repeatable and mass production of Au nanocubes. Moreover, the systematic deposition kinetics was demonstrated by changing the concentration of AA, Br^- ions and Au seeds. Interestingly, a novel nanocrystal of asymmetric bipyramid appeared as impurity in process of the CPC system-based Au nanocubes synthesis and its geometry features were analyzed comprehensively. As a result, our strategy opens an avenue for the reproducible and operable fabrication of Au nanocubes with scaling-up production.

金纳米立方由于其强而可调的LSPR特性而成为极具发展前景的纳米结构。然而，直接合成拐角锐度和产率提高的金纳米立方仍在不断变化。本文提出了一种在氯化十六烷基吡啶（CPC）体系中无需任何纯化过程就能获得高锐度和产率的金纳米立方的合成策略。重要的是，在CPC体系下合成的金纳米立方对抗坏血酸（AA）和Br-离子的浓度都不敏感，这有利于金纳米立方的可重复性和大批量生产。此外，通过改变AA、Br和Au离子的浓度，证实了系统的沉积动力学。有趣的是，在CPC体系合成金纳米立方的过程中，出现了一种新的不对称双棱锥纳米晶体作为杂质，并对其几何特征进行了全面分析。因此，我们的策略为大规模生产金纳米立方的可重复性和可操作性制造开辟了一条道路。

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引用次数: 0

Electronic, optical and electrocatalytic hydrogen evolution properties of 2D Nb-doped janus WSeS monolayers 二维掺杂铌的janus WSeS单层膜的电子、光学和电催化析氢性能

IF 6.9 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science

Pub Date : 2026-06-01 Epub Date: 2026-02-12 DOI: 10.1016/j.apsusc.2026.166275

Muhammet Ayhan Işık , Güven Turgut , Mehtap Aygün Çağlar

The intrinsic out-of-plane asymmetry of two-dimensional (2D) Janus transition-metal dichalcogenide (TMDC) monolayers, such as WSeS induces built-in dipole moments that can influence surface electronic structures and improve the catalytic activity of electrochemical hydrogen evolution reaction (HER). Modulating the electronic structure of TMDC monolayers through substitutional metal doping is an effective method that enables tunable optical and electronic properties, as well as enhances HER activity. However, no experimental investigation has explored doped 2D Janus TMDC monolayers or how doping affects their electronic, optical, and catalytic properties. Here, Nb-doped Janus WSeS monolayer, for the first time, was successfully produced from Nb-doped WSe₂ using a plasma-assisted chemical vapor deposition (CVD) process. Overall, Nb doping combined with out-of-plane asymmetry altered the optical and electronic properties of Nb-doped Janus WSeS. It exhibited the highest HER activity compared to the intrinsic WSeS. This is attributed to the efficient charge transport caused by Nb-induced p-type doping of Janus WSeS. Additionally, the broken mirror symmetry increases electron density on the basal surface, making them attractive for HER. These findings provide essential insights into the design of advanced 2D Janus TMDC materials with tunable electronic, optical, and catalytic properties via controlled doping strategies, for electrocatalytic and optoelectronic applications.

二维（2D） Janus过渡金属二硫化物（TMDC）单层（如WSeS）固有的面外不对称性诱导了内置偶极矩，从而影响了表面电子结构，提高了电化学析氢反应（HER）的催化活性。通过取代金属掺杂调制TMDC单层膜的电子结构是一种有效的方法，可以实现可调的光学和电子性能，并提高HER活性。然而，没有实验研究探索掺杂二维Janus TMDC单层膜或掺杂如何影响其电子，光学和催化性能。本文首次利用等离子体辅助化学气相沉积（CVD）工艺，成功制备了铌掺杂WSe2的Janus WSeS单层。总的来说，Nb掺杂和面外不对称改变了掺Nb的Janus wse的光学和电子性质。与内在wse相比，它表现出最高的HER活性。这是由于nb诱导的Janus wse的p型掺杂导致了有效的电荷输运。此外，镜面对称性的破坏增加了基底表面的电子密度，使它们对HER具有吸引力。这些发现为设计先进的二维Janus TMDC材料提供了重要的见解，这些材料通过控制掺杂策略具有可调谐的电子、光学和催化性能，可用于电催化和光电子应用。

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引用次数: 0

Interfacial engineering of Nb2CTx/BNNS heterostructures for ultrathin, multifunctional microwave absorption and thermal management Nb2CTx/BNNS超薄多功能微波吸收和热管理异质结构的界面工程

IF 6.9 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science

Pub Date : 2026-06-01 Epub Date: 2026-02-06 DOI: 10.1016/j.apsusc.2026.166236

Jia Ren , Feng Liu , Guimei Shi , Lei Ding , Jiaqi Liu , Yuzheng Wang , Yusheng Wu , Xudong Sun , Laishi Li

The escalating proliferation of high-frequency electronics demands microwave absorbers that are simultaneously ultrathin, efficient, lightweight, and environmentally robust. A critical challenge lies in harmonizing strong electromagnetic dissipation with optimal impedance matching at minimal thickness. This study introduces a paradigm of covalent interfacial engineering to address this challenge. A facile one-step hydrothermal strategy that concurrently etches Nb₂AlC MAX phase and integrates hexagonal boron nitride nanosheet (BNNS) is reported, directly constructing a Nb₂CT_x/BNNS composite. This in-situ process fosters the formation of robust covalent bonds (B-O-Nb, C-N) at the heterointerface, creating a chemically bridged architecture. BNNS functions as a dielectric‑tuning unit and structural scaffold, forming a three‑dimensional ″intercalation‑barrier″ network with MXene. This architecture markedly improves impedance matching, induces pronounced interfacial polarization, and broadens the effective absorption bandwidth by exploiting multiple electromagnetic‑dissipation mechanisms. The optimized composite achieves a remarkable RL_min of −57.92 dB at an ultrathin thickness of 1.26 mm, while also enhancing thermal‑dissipation efficiency and environmental stability, thereby integrating wave‑absorption performance with thermal‑management capability and ecological adaptability. The study underscores the pivotal role of interfacial engineering in the design of multifunctional materials. It offers novel design concepts and technical pathways for next‑generation microwave absorbers intended for harsh application environments.

高频电子产品的不断发展要求微波吸收器同时具有超薄、高效、轻便和环保的特点。一个关键的挑战在于在最小厚度下协调强电磁耗散和最佳阻抗匹配。本研究引入了共价界面工程的范例来解决这一挑战。报道了一种简单的一步热液策略，可以同时蚀刻Nb2AlC MAX相并集成六方氮化硼纳米片（BNNS），直接构建Nb2CTx/BNNS复合材料。这种原位过程促进在异质界面上形成坚固的共价键（B-O-Nb, C-N），形成化学桥接结构。BNNS作为介质调节单元和结构支架，与MXene形成三维″插层屏障″网络。该结构通过利用多种电磁耗散机制，显著改善了阻抗匹配，诱导了明显的界面极化，并拓宽了有效吸收带宽。优化后的复合材料在1.26 mm的超薄厚度下获得了−57.92 dB的显著RLmin，同时还提高了散热效率和环境稳定性，从而将吸波性能与热管理能力和生态适应性相结合。该研究强调了界面工程在多功能材料设计中的关键作用。它为下一代微波吸收器提供了新颖的设计理念和技术途径，用于恶劣的应用环境。

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