Applied Surface Science最新文献_第10页

Radio frequency O2-plasma treatment of carbon felts: stoichiometric insight into C1s and O1s XPS with correlated Raman and SEM characterization 碳毡的射频o2等离子体处理：化学计量学洞察C1s和O1s XPS与相关拉曼和SEM表征

IF 6.9 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science

Pub Date : 2026-05-30 Epub Date: 2026-02-04 DOI: 10.1016/j.apsusc.2026.166208

Ahmad Alem , Yining Huang , Nicole Wechner , Michael Feuchter , Matheus A. Tunes , Christoph Rameshan , Stefan Spirk , Christine Bandl

Surface functionalization of carbon plays a key role in tailoring their interfacial properties for applications in energy storage, energy conversion, structural composites, etc. In this work, radio frequency (RF) O₂-plasma was employed to tailor the surface chemistry of C-felts. The influence of plasma power and treatment duration was studied. X-ray photoelectron spectroscopy (XPS) revealed that oxygen incorporation increases upon plasma treatment with powers up to 100 W, decreasing the C/O ratio significantly, followed by partial recovery at higher powers due to ion-induced etching. High-resolution C1s and O1s spectra were deconvoluted using a stoichiometric correlation strategy to improve peak assignments. Despite the inherent complexity of O1s spectra due to peak overlap and symmetric features, a consistent interpretation was achieved. Hence, by providing a stoichiometry-driven framework we improve the accuracy and consistency of XPS analysis by correlating the deconvolution of high-resolution C1s and O1s spectra. Raman spectroscopy confirmed the progressive increase in structural defects, with higher plasma powers and longer exposures. Scanning electron microscopy (SEM) revealed pronounced surface roughening and fiber etching after plasma. Overall, this work provides a deeper insight into surface modification of carbon felt utilizing O₂-plasma and establishes a stoichiometric framework for interpreting complex XPS spectra of oxygen-functionalized carbons.

碳的表面功能化在调整其界面性能方面起着关键作用，可用于储能、能量转换、结构复合材料等领域。在这项工作中，使用射频（RF） o2等离子体来定制c毡的表面化学。研究了等离子体功率和处理时间的影响。x射线光电子能谱（XPS）显示，在功率高达100 W的等离子体处理下，氧掺入增加，C/O比显著降低，随后在更高功率下由于离子诱导蚀刻而部分恢复。采用化学计量相关策略对高分辨率C1s和O1s光谱进行反卷积，以改善峰分配。尽管O1s光谱由于峰重叠和对称特征而具有固有的复杂性，但仍然获得了一致的解释。因此，通过提供一个化学计量驱动的框架，我们通过关联高分辨率C1s和O1s光谱的反褶积来提高XPS分析的准确性和一致性。拉曼光谱证实，随着等离子体功率的增加和曝光时间的延长，结构缺陷逐渐增加。扫描电子显微镜（SEM）显示等离子体处理后表面明显粗糙化和纤维蚀刻。总的来说，这项工作为利用o2等离子体对碳毡进行表面改性提供了更深入的了解，并建立了一个用于解释氧官能化碳的复杂XPS光谱的化学计量框架。

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引用次数: 0

Regulating the interfacial microstructure and mechanical properties of Inconel 718 coatings via Dual-Arc Modulated plasma arc cladding 双弧调制等离子体电弧熔覆对Inconel 718镀层界面组织和力学性能的影响

IF 6.9 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science

Pub Date : 2026-05-30 Epub Date: 2026-02-04 DOI: 10.1016/j.apsusc.2026.166078

Lunwu Zhao , Yu Kong , Jianglong Wang , Haihong Huang

Plasma arc cladding (PAC) is widely employed for surface modification; however, its inherently high heat input often leads to severe molten pool overheating, grain coarsening, and residual stress accumulation, ultimately degrading coating integrity and mechanical response. To achieve more precise control over surface heat transfer, we propose a dual-arc modulation strategy in which a portion of the transferred arc current (TAC) is replaced by non-transferred arc current (NTAC). This approach enables substantial heat-input reduction while maintaining comparable molten pool characteristics. A multiphysics model incorporating magnetohydrodynamic (MHD) effects was established to resolve coupled thermo-fluid–electromagnetic phenomena governing surface energy deposition and was validated experimentally through arc pressure measurements. The results demonstrate that increasing NTAC from 20 A to 100 A enables a simultaneous reduction in TAC from 120 A to 80 A, resulting in a 23.3% decrease in heat input to the substrate. When applied to Inconel 718 cladding, the strategy refined the solidification interface, leading to an 11.3% reduction in primary dendrite arm spacing (PDAS) and a 6.6% increase in surface microhardness. This study provides a controllable framework for regulating interfacial solidification behavior and enhancing surface mechanical properties in nickel-based superalloy coatings through precise dual-arc plasma modulation.

等离子弧包覆（PAC）被广泛应用于表面改性；然而，其固有的高热量输入往往导致严重的熔池过热、晶粒粗化和残余应力积累，最终降低涂层的完整性和力学响应。为了实现对表面传热的更精确控制，我们提出了一种双电弧调制策略，其中一部分转移电弧电流（TAC）被非转移电弧电流（NTAC）取代。这种方法可以在保持相当的熔池特性的同时大幅减少热输入。建立了包含磁流体动力学（MHD）效应的多物理场模型，以解决控制表面能沉积的热-流-电磁耦合现象，并通过电弧压力测量进行了实验验证。结果表明，将NTAC从20 A增加到100 A，可以同时将TAC从120 A降低到80 A，从而使基板的热输入减少23.3%。当应用于Inconel 718熔覆层时，该策略细化了凝固界面，导致初级枝晶臂间距（PDAS）降低11.3%，表面显微硬度提高6.6%。该研究为通过精确的双弧等离子体调制来调节镍基高温合金涂层的界面凝固行为和提高表面力学性能提供了一个可控的框架。

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引用次数: 0

Proportional optimization and performance evaluation of YbTaO4-Ta2O5 composite coatings for integrated thermal environmental barrier coatings (TEBCs) on SiCf/SiC composites YbTaO4-Ta2O5复合涂层在SiCf/SiC复合材料上的比例优化及性能评价

IF 6.9 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science

Pub Date : 2026-05-30 Epub Date: 2026-01-31 DOI: 10.1016/j.apsusc.2026.166136

Zongdan Qiu , Qiaomu Liu , Shujuan Dong , Xingzhou Linghu , Yan Huang , Jianing Jiang , Longhui Deng , Wenbo Chen , Xueqiang Cao

YbTaO₄-Ta₂O₅ thermal environmental barrier coatings (YbT-T TEBCs) were fabricated by atmospheric plasma spraying technology (APS) using composite feedstock with different constitution ratios, which protected SiC_f/SiC-CMCs from water vapor corrosion and high-temperature ablation. By comparing the thermophysical and mechanical properties of YbT-T TEBCs, the optimal ratio was determined as 48.4 wt.%YbT + 51.6 wt.%T. Moreover, the thermal cycling performance and water oxygen corrosion resistance at 1350℃ of the SiC_f/SiC-CMCs fully-cladded with optimized YbT-T TEBCs were investigated. The findings indicated that the thermal cycling life of YbT-T TEBCs was greater than 500 cycles, which was mainly attributed to the coefficient of thermal expansion (CTE) being relatively matched with that of the substrate. After 60 h water oxygen corrosion at 1350℃, the strength retention rate of YbT-T TEBCs-cladded SiC_f/SiC-CMCs (73.91%) was about 8.1 times higher than that of SiC_f/SiC-CMCs (8.10%). YbT-T TEBCs as integrated protective coating systems offer outstanding resistance to both high-temperature shocking and water oxygen corrosion.

采用不同组成比的复合原料，采用常压等离子喷涂技术（APS）制备了YbTaO4-Ta2O5热环境屏障涂层（YbT-T tebc），使SiCf/ sic - cmc免遭水蒸气腐蚀和高温烧蚀。通过比较YbT-T tebc的热物理性能和力学性能，确定了最佳配比为48.4 wt.%YbT + 51.6 wt.%T。此外，研究了优化后的YbT-T tebc包覆SiCf/ sic - cmc的热循环性能和1350℃下的耐水氧腐蚀性能。结果表明，YbT-T tebc的热循环寿命大于500次，这主要归因于其热膨胀系数（CTE）与衬底的热膨胀系数（CTE）相对匹配。1350℃水氧腐蚀60 h后，YbT-T tebcs包覆SiCf/ sic - cmc的强度保持率（73.91%）比SiCf/ sic - cmc的强度保持率（8.10%）高约8.1倍。YbT-T tebc作为综合防护涂层系统，具有优异的耐高温冲击和水氧腐蚀性能。

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引用次数: 0

Iron-modified dendritic mesoporous silica nanoparticles as catalysts for propane and ethane oxidative dehydrogenation 铁修饰的枝状介孔二氧化硅纳米颗粒作为丙烷和乙烷氧化脱氢的催化剂

IF 6.9 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science

Pub Date : 2026-05-30 Epub Date: 2026-01-30 DOI: 10.1016/j.apsusc.2026.166073

Agnieszka Held , Julia Sobalska , Jolanta Kowalska-Kuś , Aldona Jankowska , Ewa Janiszewska , Krystyna Nowińska , Olena Tynkevych , Kinga Góra-Marek

Olefin production through oxidative dehydrogenation (ODH) presents a sustainable alternative to conventional methods (mainly steam cracking, FCC, and non-oxidative dehydrogenation) with significant energy savings and reduced greenhouse gas emissions. This study explores the catalytic potential of dendritic mesoporous silica nanoparticles (DMSNs) and alumina–silica nanoparticles (AlDMSNs) modified with iron for ethane and propane ODH using N₂O as an oxidant. A series of well-dispersed Fe-containing DMSN catalysts was synthesized through one-pot, impregnation, and ion-exchange methods using pure silica or Al-modified DMSN supports. Comprehensive characterization (SEM, TEM, NH₃-TPD, H₂-TPR, UV–Vis, N₂ adsorption, FT-IR, ICP-OES, and FT-IR&MS) confirmed the retention of the DMSN structure and, importantly, revealed variations in acidity and catalytic performance influenced by the preparation methods and the supports applied. Catalysts exhibited high activity and stability, with selectivity to ethene and propene ranging from 60 to 90%, depending on temperature and feed composition. Fe-DMSN, a one-pot-synthesized material, demonstrated superior time-on-stream stability, emphasizing its potential for efficient and scalable olefin production.

通过氧化脱氢（ODH）生产烯烃是传统方法（主要是蒸汽裂解、FCC和非氧化脱氢）的可持续替代方案，具有显著的节能和减少温室气体排放的作用。本研究探讨了树枝状介孔二氧化硅纳米粒子（DMSNs）和铁修饰的氧化铝-二氧化硅纳米粒子（AlDMSNs）对乙烷和丙烷ODH的催化潜力。以纯二氧化硅或铝改性的DMSN为载体，通过一锅法、浸渍法和离子交换法制备了一系列分散良好的含铁DMSN催化剂。综合表征（SEM、TEM、NH3-TPD、H2-TPR、UV-Vis、N2吸附、FT-IR、ICP-OES和FT-IR&；MS）证实了DMSN结构的保留，更重要的是，揭示了制备方法和载体对酸性和催化性能的影响。催化剂表现出较高的活性和稳定性，对乙烯和丙烯的选择性在60%至90%之间，取决于温度和进料成分。Fe-DMSN是一种单罐合成材料，表现出优异的流上时间稳定性，强调了其高效和可扩展的烯烃生产潜力。

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引用次数: 0

Enhancing the insulation performance of aramid fiber epoxy resin by constructing a polar-nanofibrillation structure on the fiber surface 通过在纤维表面构建极性纳米纤维结构，提高芳纶纤维环氧树脂的绝缘性能

IF 6.9 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science

Pub Date : 2026-05-30 Epub Date: 2026-02-08 DOI: 10.1016/j.apsusc.2026.166204

Guowei Xia , Jun Xie , Qiqiang Chen , Qikai Wang , Chengming Hu , Zhaohua Zhang , Qing Xie

Aramid fiber, as a new generation of synthetic fiber material, has excellent insulation and mechanical properties and is widely used in high-voltage power transmission and transformation equipment. However, the problems of smooth surface and low chemical reactivity seriously restrict the combination with polymers and reduce the withstand voltage characteristics of insulation devices. Hence, this paper proposes to use aramid nanofibers (ANFs) obtained through nanofibrillation treatment to regulate the surface roughness of aramid fibers. Meanwhile, polar functional groups were introduced during the deprotonation process, successfully constructing polar-nanofibrillation structures on the aramid fiber surface, further regulating the polarity of fiber surfaces. Through insulation performance tests and molecular dynamics simulations, the influence of polar functional group types on the insulation performance of aramid fiber-epoxy resin composites was revealed. The results show that the flashover voltage of the modified AFEP has increased by 58.01% and the breakdown field strength has increased by 56.52%. Analysis suggests that different polarity treatments have different mechanisms for enhancing insulation performance. Among them, the amino group is achieved by enhancing the interface bonding between aramid fibers and epoxy resin, while the fluorine-containing groups improve the material’s ability to control charge distribution.

芳纶纤维作为新一代合成纤维材料，具有优良的绝缘性能和力学性能，广泛应用于高压输变电设备中。然而，表面光滑和化学反应性低的问题严重限制了与聚合物的结合，降低了绝缘器件的耐压特性。因此，本文提出利用纳米纤颤处理得到的芳纶纳米纤维（ANFs）来调节芳纶纤维的表面粗糙度。同时，在去质子化过程中引入极性官能团，在芳纶纤维表面成功构建极性纳米纤维结构，进一步调控纤维表面极性。通过绝缘性能测试和分子动力学模拟，揭示了极性官能团类型对芳纶纤维-环氧树脂复合材料绝缘性能的影响。结果表明，改性后的AFEP闪络电压提高了58.01%，击穿场强提高了56.52%。分析表明，不同极性处理对提高绝缘性能有不同的作用机制。其中，氨基是通过增强芳纶纤维与环氧树脂之间的界面键合来实现的，而含氟基团则提高了材料控制电荷分布的能力。

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引用次数: 0

Effects of graphene and α-Al2O3 nano-additives on the fretting wear behavior of MAO coatings on Ti6Al4V alloy: a comparison of self-lubrication and hardness-enhancement strategies 石墨烯和α-Al2O3纳米添加剂对Ti6Al4V合金MAO涂层微动磨损行为的影响：自润滑和硬度增强策略的比较

IF 6.9 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science

Pub Date : 2026-05-30 Epub Date: 2026-02-07 DOI: 10.1016/j.apsusc.2026.166212

Zhangyue Qin , Yali Zhang , Xiaogang Zhang , Xinlu Yuan , Zhongmin Jin

Fretting wear of Ti6Al4V alloy for femoral stems in artificial hip joints is a major contributor to prosthesis loosening and subsequent revision surgeries. Micro-arc oxidation (MAO) emerges as a feasible and highly promising surface modification technique to mitigate this problem. In recent years, two key optimization strategies have been proposed to enhance wear resistance of MAO coatings: incorporating self-lubricating and high-hardness nanomaterials. However, existing studies have focused on sliding wear, while the effects of such nano-additives on fretting wear behavior of MAO coatings remain unclear. In this study, self-lubricating graphene (G) and high-hardness alumina (Al₂O₃) nanomaterials were incorporated into MAO coatings on Ti6Al4V alloy. The fretting wear behaviors of conventional, G-reinforced, and Al₂O₃-reinforced coatings under various fretting regimes were systematically investigated, and optimization mechanisms were elucidated. The results revealed that both graphene and alumina significantly enhanced coatings’ fretting wear resistance. The optimization mechanism of graphene was primarily manifested in promoting lubrication. During debris generation, pore compression, and coating damage, graphene progressively transferred and dispersed throughout the wear region, forming a smooth and uniform lubricating film on the coating surface. In contrast, alumina markedly improved coating hardness by bearing load, reinforcing bonding, and filling pores, thereby enhancing wear resistance. Notably, under the mixed fretting regime (MFR) and gross slip regime (GSR), G-reinforced coatings exhibited the lowest friction coefficient due to excellent lubricating ability. Nevertheless, across all fretting regimes, Al₂O₃-reinforced coatings exhibited the lowest wear rate due to superior fatigue resistance. Overall, alumina demonstrated more pronounced improvement and greater potential than graphene.

人工髋关节股骨柄Ti6Al4V合金微动磨损是导致假体松动和后续翻修手术的主要原因。微弧氧化（MAO）是一种可行且极具前景的表面改性技术。近年来，人们提出了两种提高MAO涂层耐磨性的关键优化策略：加入自润滑和高硬度纳米材料。然而，现有的研究主要集中在滑动磨损上，而这些纳米添加剂对MAO涂层微动磨损行为的影响尚不清楚。本研究将自润滑石墨烯(G)和高硬度氧化铝（Al2O3）纳米材料加入到Ti6Al4V合金的MAO涂层中。系统研究了不同微动状态下普通涂层、g增强涂层和al2o3增强涂层的微动磨损行为，并阐明了微动磨损的优化机理。结果表明，石墨烯和氧化铝均显著增强了涂层的微动耐磨性。石墨烯的优化机理主要表现在促进润滑方面。在碎屑产生、孔隙压缩和涂层损伤过程中，石墨烯在整个磨损区逐渐转移和分散，在涂层表面形成光滑均匀的润滑膜。相比之下，氧化铝通过承载载荷、增强结合、填充孔隙等方式显著提高涂层硬度，从而提高耐磨性。值得注意的是，在混合微动状态（MFR）和总滑移状态（GSR）下，g增强涂层由于具有优异的润滑性能，其摩擦系数最低。然而，在所有的微动状态下，由于优异的抗疲劳性能，al2o3增强涂层的磨损率最低。总体而言，氧化铝表现出比石墨烯更明显的改进和更大的潜力。

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引用次数: 0

Surface activated bonding of (100)-β-Ga2O3 and Si: Annealing-induced evolution of interfacial microstructure and its effects on thermal transport （100）-β-Ga2O3与Si的表面激活键合：退火诱导界面微观结构演变及其对热输运的影响

IF 6.9 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science

Pub Date : 2026-05-30 Epub Date: 2026-02-08 DOI: 10.1016/j.apsusc.2026.166258

Yongfeng Qu , Wenbo Hu , Fei Wang , Boquan Ren , Hongxing Wang , Jijun Ding , Haixia Chen

High‑performance β-Ga₂O₃/Si heterointerfaces are crucial for next‑generation power and optoelectronic devices, yet their thermal stability and interfacial thermal transport remain challenging due to lattice mismatch and thermal expansion mismatch. Herein, we fabricated β-Ga₂O₃(1 0 0)/Si heterointerface by surface-activated bonding and investigated the annealing-induced evolution of interfacial microstructures and their regulatory effects on interfacial thermal transport properties. A 16.2 nm-thick interlayer consisting of amorphous Si and Fe forms at the as-bonded heterointerface, while annealing at 1000 °C reduces its thickness to 4.3 nm and eliminates the characteristic signal of concentrated Fe. Molecular dynamics simulations indicate that these amorphous interlayers degrade interfacial thermal transport properties, with interfacial thermal conductance (ITC) decreasing as amorphous Si layer thickness and Fe atomic fraction increase. Amorphous Si reduces the ITC by 24% relative to the ideal interface, while Fe doping can further decrease the value by 29.5%. This work reveals the critical role of interfacial microstructures and elemental distributions in regulating interfacial thermal properties, and provides a theoretical basis for optimizing bonding processes and thermal management strategies.

高性能β-Ga2O3/Si异质界面对于下一代功率和光电子器件至关重要，但由于晶格失配和热膨胀失配，其热稳定性和界面热传输仍然具有挑战性。本文采用表面活化键合的方法制备了β-Ga2O3(1 0 0)/Si异质界面，并研究了界面微观结构的退火演化及其对界面热输运性能的调控作用。在键合异质界面处形成由非晶Si和Fe组成的16.2 nm厚的中间层，在1000 ℃下退火使其厚度减小到4.3 nm，并消除了富集Fe的特征信号。分子动力学模拟结果表明，非晶态Si层降低了界面热传递性能，界面导热系数（ITC）随非晶态Si层厚度和Fe原子分数的增加而降低。与理想界面相比，非晶态Si使ITC降低了24%，而Fe的掺杂使ITC进一步降低了29.5%。本研究揭示了界面微观结构和元素分布在界面热性能调节中的关键作用，为优化键合工艺和热管理策略提供了理论依据。

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引用次数: 0

Interstitial boron-driven Pt surface strain for durable methylcyclohexane dehydrogenation 持久甲基环己烷脱氢的间隙硼驱动Pt表面应变

IF 6.9 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science

Pub Date : 2026-05-30 Epub Date: 2026-02-06 DOI: 10.1016/j.apsusc.2026.166234

ByeongJo Shim , K.C. Bhamu , Sojin Hong , Min Gyu Kim , Dongjun Kim , NaHyeon Hong , Jungwon Park , Sung Gu Kang , Chang Won Yoon

Methylcyclohexane (MCH) is a promising liquid organic H₂ carrier for high-capacity, long-distance H₂ storage and transportation, owing to its high compatibility with existing fossil fuel infrastructure. Although platinum (Pt) catalysts are widely used for MCH dehydrogenation owing to their excellent activity and selectivity, catalytic deactivation at temperatures above 300 °C remains a significant challenge that hinders commercial deployment. In this study, we present a simple impregnation strategy to generate interstitially B-incorporated Pt on alumina, PtB-X/A (X = 0.8, 3.2, and 7.5), where X denotes the B/Pt molar ratio. PtB-0.8/A catalyst exhibited superior stability during continuous MCH dehydrogenation at 300 °C under a liquid hourly space velocity of 3.6 mL g_cat^-1h⁻¹, producing high-purity H₂ (>99.97 %) with a conversion of 95 % and a toluene selectivity of 99.99 %. Additionally, PtB-0.8/A demonstrated excellent stability over 200 h without noticeable deterioration. Experimental and theoretical studies revealed that doped boron atoms occupy interstitial sites, thereby elongating Pt–Pt bond length. Moreover, the amount of B doping was critical in determining catalytic performance. These findings highlight interstitial heteroatom doping as a promising alternative catalyst design strategy for enhancing the durability of MCH dehydrogenation, and suggest it as a feasible alternative to sulfur-based promoters.

甲基环己烷（Methylcyclohexane， MCH）与现有化石燃料基础设施具有良好的相容性，是一种很有前途的高容量、长距离储氢和运输的液体有机氢气载体。尽管铂（Pt）催化剂因其优异的活性和选择性被广泛用于MCH脱氢，但在300°C以上的温度下催化失活仍然是阻碍商业应用的重大挑战。在这项研究中，我们提出了一种简单的浸渍策略，可以在氧化铝上生成插入B的Pt， PtB-X/ a (X = 0.8, 3.2和7.5)，其中X表示B/Pt的摩尔比。PtB-0.8/A催化剂在300℃条件下，在3.6 mL gcat-1h−1的液时空速下连续脱氢，表现出优异的稳定性，产生高纯度H2 (> 99.97%)，转化率为95%，甲苯选择性为99.99%。此外，PtB-0.8/A在200小时内表现出出色的稳定性，没有明显的劣化。实验和理论研究表明，掺杂硼原子占据间隙位，从而延长了Pt-Pt键的长度。此外，B掺杂的量是决定催化性能的关键。这些发现突出了间隙杂原子掺杂作为一种有前途的替代催化剂设计策略，可以提高MCH脱氢的耐久性，并表明它是硫基促进剂的可行替代方案。

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引用次数: 0

Dual interface confinement engineering via physical and chemical synergistic effects for ultrastable SrWO4/MAPbBr3@MS-4A composites 基于物理和化学协同效应的超稳定SrWO4/MAPbBr3@MS-4A复合材料双界面约束工程

IF 6.9 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science

Pub Date : 2026-05-30 Epub Date: 2026-02-06 DOI: 10.1016/j.apsusc.2026.166233

Jian Ma , Shihao Dong , Guofu Wei , Peng Liu , Mingdong Zhou , Yan Xu

The Interface confinement strategy is crucial for achieving highly stable and enhanced photoluminescence in lead halide perovskite nanocrystals and expanding their optoelectronic applications. A dual-interface confinement strategy combining physical and chemical approaches was proposed to construct ternary SrWO₄/MAPbBr₃@MS-4A. Specifically, epitaxial growth of MAPbBr₃ quantum dots (QDs) on lattice-matched SrWO₄ was achieved within the channels of molecular sieve 4A (MS-4A). Benefiting from the porous confinement of MS-4A and surface defect passivation by SrWO₄, the composites exhibit significantly enhanced photoluminescence along and high stability against ultraviolet (UV) irradiation, water, and heat. SrWO₄/MAPbBr₃@MS-4A exhibits temperature-dependent fluorescence intensity and peak shift, which respectively enable it to serve as a dual-mode optical thermometer with a maximum relative temperature sensitivity of 3.94% K⁻¹. Furthermore, white LEDs fabricated with the composite achieve a high luminous efficiency of 37.12 lm·W⁻¹, a correlated color temperature (CCT) of 8077 K, and a wide color gamut covering 102.5% of the NTSC standard. The WLED devices show excellent stability under long-term operation and high current. This work provides a simple and green approach for assembling lattice-matched multicomponent perovskite composites, achieving enhanced photoluminescence and stability for diverse optical applications.

界面约束策略对于实现卤化铅钙钛矿纳米晶体的高稳定和增强光致发光以及扩大其光电应用至关重要。提出了一种物理和化学相结合的双界面约束策略来构建三元SrWO4/MAPbBr3@MS-4A。具体来说，MAPbBr3量子点（QDs）在晶格匹配的SrWO4上实现了在分子筛4A （MS-4A）通道内的外延生长。得益于MS-4A的多孔约束和SrWO4的表面缺陷钝化，该复合材料具有显著增强的光致发光性能和高的抗紫外线、水和热稳定性。SrWO4/MAPbBr3@MS-4A表现出温度依赖的荧光强度和峰移，使其能够作为双模光学温度计，最大相对温度灵敏度为3.94% K - 1。此外，用该复合材料制备的白光led的发光效率为37.12 lm·W−1，相关色温（CCT）为8077 K，色域宽覆盖NTSC标准的102.5%。WLED器件在长期工作和大电流下均表现出优异的稳定性。这项工作为组装晶格匹配的多组分钙钛矿复合材料提供了一种简单而绿色的方法，在各种光学应用中实现了增强的光致发光和稳定性。

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引用次数: 0

Stacking faults-rich silver catalysts synthesized via self-assembly for the efficient catalytic reduction of nitrophenols/nitroanilines 自组装法合成富层错银催化剂，用于硝基酚/硝基苯胺的高效催化还原

IF 6.9 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science

Pub Date : 2026-05-30 Epub Date: 2026-02-04 DOI: 10.1016/j.apsusc.2026.166205

Zhengqiu Chen , Junyu Chen , Huaming Mao , Jungang Yin , Yu Ren , Wei Dai , Shuanglong Zhao , Hongwei Yang

Nitrophenols and nitroanilines represent a series of organic pollutants that pose a significant environmental threat. Nevertheless, their catalytic reduction products — aminophenols and phenylenediamine — are regarded as valuable industrial intermediates. Therefore, identifying a highly active and cost-effective catalyst is essential for achieving the efficient catalytic conversion of nitrophenol and nitroaniline. Here, we employed a liquid-phase reduction approach to synthesize silver catalysts with varied morphologies and abundant defects (stacking faults and microporosity) through a rapid self-assembly process induced by gelatin. We found that the conformation of small polypeptide chains in gelatin can be regulated via controlled temperature gradients during synthesis, thereby directing the self-assembly of silver nanostructures into 2D nanosheets and 3D spherical nanoflowers. Spherical aberration transmission electron microscopy revealed the presence of abundant stacking faults on the surface of the silver catalyst. Therefore, the silver catalysts exhibited excellent catalytic activity for the catalytic reduction of 4-nitrophenol (4-NP), 2-nitrophenol (2-NP), and p-nitroaniline (p-NA), with reaction rate constants of 1.20 × 10⁻² s⁻¹, 1.04 × 10⁻² s⁻¹, and 1.23 × 10⁻² s⁻¹, respectively. Furthermore, a detection limit of 50 nM for 4-NP was achieved using AgNSs-modified glassy carbon electrodes.

硝基酚类和硝基苯胺类是一类对环境构成重大威胁的有机污染物。然而，它们的催化还原产物-氨基酚和苯二胺-被认为是有价值的工业中间体。因此，寻找一种高效、经济的催化剂是实现硝基苯酚和硝基苯胺高效催化转化的关键。在这里，我们采用液相还原方法，通过明胶诱导的快速自组装过程，合成了具有不同形态和丰富缺陷（层错和微孔）的银催化剂。我们发现明胶中小多肽链的构象可以在合成过程中通过控制温度梯度来调节，从而指导银纳米结构自组装成二维纳米片和三维球形纳米花。球差透射电镜显示，银催化剂表面存在丰富的层错。因此,银催化剂表现出优良的催化活性的催化还原4-nitrophenol (4-NP) 2-nitrophenol (2-NP),和对硝基苯胺(p-NA),反应速率常数为1.20 × 10−2 s−1)1.04 × 10−2 s−1)和1.23 × 10−2 s−1)。此外，使用agnss修饰的玻碳电极，4-NP的检测限为50 nM。

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