Materials Chemistry and Physics最新文献_第9页

Time-controlled blue-to-red photoluminescence modulation in silicon-rich oxide thin films deposited by HFCVD using SBA-15-based solid precursors 基于sba -15的固体前驱体HFCVD沉积富硅氧化薄膜的时间控制蓝-红光致发光调制

IF 4.7 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2026-01-22 DOI: 10.1016/j.matchemphys.2026.132122

Daniel Diaz Tapia , Crisoforo Morales Ruiz , Reina Galeazzi Isasmendi , Héctor Pérez Ladrón de Guevara , Godofredo Garcia , Roberto Portillo

Silicon-rich oxide (SRO) thin films with tunable photoluminescence were deposited by hot-filament chemical vapor deposition (HFCVD) using mesoporous silica SBA-15 and europium-impregnated SBA-15 (SBA-15:Eu) as solid precursors. Unlike conventional gaseous or liquid precursors, the use of chemically engineered mesoporous solids enables a controlled delivery of silicon- and oxygen-containing species, as well as low concentrations of rare-earth dopants, during film growth. Structural characterization of the precursors confirms that europium impregnation preserves the ordered mesoporous framework of SBA-15 while significantly modifying pore accessibility and surface chemistry.

The resulting SRO and Eu-modified SRO (SRO:Eu) films exhibit a progressive modulation of their photoluminescence response from the blue to the red spectral region as a function of deposition time and relative film thickness. Photoluminescence analysis reveals the coexistence of multiple overlapping emission bands associated with defect-related and matrix-assisted radiative recombination pathways, whose relative contributions evolve systematically with growth conditions.

Although the oxidation state of europium cannot be unambiguously determined from the available data, the optical behavior indicates that, under the present growth conditions, europium does not act as a classical dominant luminescent center. Instead, Eu incorporation perturbs the radiative landscape of the silicon-rich oxide matrix, redistributing the balance between competing recombination channels. These results demonstrate that SBA-15-based solid precursors provide an effective and versatile route for tailoring the structural and optical properties of SRO thin films grown by HFCVD, offering a scalable platform for the development of silicon-compatible photonic materials with tunable luminescence.

以介孔二氧化硅SBA-15和铕浸渍SBA-15 （SBA-15:Eu）为固体前驱体，采用热丝化学气相沉积（HFCVD）法制备了具有可调谐光致发光特性的富硅氧化物（SRO）薄膜。与传统的气态或液态前驱体不同，使用化学工程的介孔固体可以在薄膜生长过程中控制含硅和含氧物质的输送，以及低浓度的稀土掺杂剂。前驱体的结构表征证实，铕浸渍保留了SBA-15的有序介孔框架，同时显著改变了孔隙可达性和表面化学性质。所得到的SRO和Eu修饰的SRO （SRO:Eu）薄膜的光致发光响应随沉积时间和相对薄膜厚度的变化呈现出从蓝到红的渐变调制。光致发光分析揭示了与缺陷相关和基质辅助辐射重组途径相关的多个重叠发射带共存，其相对贡献随着生长条件的变化而系统地演化。虽然铕的氧化态不能从现有的数据中明确地确定，但光学行为表明，在目前的生长条件下，铕不作为经典的主导发光中心。相反，Eu的加入扰乱了富硅氧化物基质的辐射景观，重新分配了相互竞争的重组通道之间的平衡。这些结果表明，基于sba -15的固体前驱体为调整HFCVD生长的SRO薄膜的结构和光学特性提供了有效和通用的途径，为开发具有可调谐发光的硅兼容光子材料提供了可扩展的平台。

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引用次数: 0

Heterostructured photoredox TiO2/CuO degraded mixed textile pollutants under natural sunlight irradiation 异质结构光氧化还原TiO2/CuO在自然光照射下降解纺织混合污染物

IF 4.7 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2026-01-21 DOI: 10.1016/j.matchemphys.2026.132119

Dipti Rani , Vikas Kumar , Mahender Pal , L.P. Purohit , Sanjeev Kumar Sharma , Himanshu Gupta

Heterostructured photoredox titanium dioxide/copper oxide (TiO₂/CuO) nanoslates were synthesized using the sol-gel precipitation method and tested for the photocatalytic performance for the removal of mixed dyes, methylene blue (MB), methyl orange (MO), crystal violet (CV), and Congo red (CR), under natural sunlight irradiation (∼107.5 mW/cm²). CuO guided the strain production in TiO₂ to regulate defects that enhanced the photocatalytic rate reactions. The Ti─Cu, Ti─O, Ti─O─Cu, and Cu─O bonds were observed to correspond to the binding energies of heterojunctions, producing ROSs and charge carriers (•O₂⁻, h⁺, •OH) due to a lower bandgap (E_g = 2.68 eV). The E_g and the crystallite decreased from 2.85 to 2.68 eV, and 28 to 24 nm as the concentration of CuO increased. The typical TiO₂/CuO ratio (1:3) yielded the most reactive catalyst, increasing the removal rate of a mixed organic dye from 83% to 99% in an alkaline solution (pH = 9). This work provides fresh insights into the development of high-performance, high-stability heterostructure photocatalysts.

采用溶胶-凝胶沉淀法合成了异结构光氧化还原二氧化钛/氧化铜（TiO2/CuO）纳米板，并测试了其在自然光照（~ 107.5 mW/cm2）下对亚甲基蓝（MB）、甲基橙（MO）、结晶紫（CV）和刚果红（CR）等混合染料的光催化性能。CuO引导TiO2中的应变生成，调节缺陷，提高光催化反应速率。观察到Ti─Cu、Ti─O、Ti─O─Cu和Cu─O键对应于异质结的结合能，由于较低的带隙（Eg = 2.68 eV），产生ROSs和载流子（•O2−、h+、•OH）。随着CuO浓度的增加，晶态Eg从2.85 eV减小到2.68 eV，晶态Eg从28 nm减小到24 nm。在pH = 9的碱性溶液中，TiO2/CuO比例为1:3时，催化剂的活性最高，可将混合有机染料的去除率从83%提高到99%。这项工作为高性能、高稳定性异质结构光催化剂的开发提供了新的见解。

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引用次数: 0

Enhanced photocatalytic CO2 reduction via plasmonic Au-Co3O4-Au dendrite heterostructures on silicon 利用等离子体Au-Co3O4-Au枝晶异质结构增强光催化CO2还原

IF 4.7 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2026-01-21 DOI: 10.1016/j.matchemphys.2026.132063

K. Poshan Kumar Reddy , Aparna K. Kharade , Nishchal Bharadwaj , Shyam Narayan Singh Yadav , Yan Sen , Yung-Sheng Lin , G. Phaneendra Reddy , Po-Tsung Lee , Sue-min Chang , Lixia Zhao

The increase of carbon dioxide (CO₂) emissions caused by industrialization, fossil fuel use, and deforestation represent a major challenge for sustainable development. In this work, we fabricated a non-lithography 3D disordered gold dendrite Au–Co₃O₄–Au heterostructure. The results show that combining the catalytic properties of Co₃O₄ with surface plasmon resonance effects can significantly enhance photocatalytic carbon dioxide reduction. The methane and methanol yields were both enhanced respectively. We also demonstrated that the Si-Au composite exhibits catalytic activity for methane production, while the Si-Au/Co₃O₄-Au composite performs better in methanol oxidation. These findings provide a promising way for sustainable fuel production and CO₂ capture by advanced material design.

工业化、化石燃料使用和森林砍伐造成的二氧化碳排放量增加是可持续发展面临的重大挑战。在这项工作中，我们制备了一个非光刻的三维无序金枝晶Au-Co3O4-Au异质结构。结果表明，将Co3O4的催化性能与表面等离子体共振效应相结合，可以显著提高光催化二氧化碳还原效果。甲烷和甲醇的产率均有提高。我们还证明了Si-Au复合材料具有甲烷生成的催化活性，而Si-Au/Co3O4-Au复合材料在甲醇氧化方面表现更好。这些发现为通过先进的材料设计实现可持续燃料生产和二氧化碳捕获提供了一条有希望的途径。

引用次数: 0

Production and characterization of functional grading aluminum matrix materials by powder metallurgy 粉末冶金功能分级铝基材料的生产与表征

IF 4.7 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2026-01-21 DOI: 10.1016/j.matchemphys.2026.132089

Musa Yılmaz , Mürsel Ekrem

This study aimed to develop hybrid composite materials made of A7075 aluminum/boron carbide (B₄C) with a hard outer region and a soft inner core, inspired by natural structures such as teeth and bones, to provide high toughness. Production was carried out using the powder metallurgy method, with ball milling times (1, 2, 3 h) and layer configurations (3, 5, 7 layers) in accordance with the functional graded material (FGM) principle. The experiments were designed using the Taguchi method for systematic optimization, and three different compression pressures (300, 400, 500 MPa), sintering times (1, 2, 3 h), and sintering temperatures (550, 570, 590 °C) were investigated. The powders were characterized prior to production using XRD, SEM, and particle size analysis. The performance of the produced composites was evaluated using compressive strength tests in accordance with ASTM E9, as well as hardness and density tests and SEM microstructure analysis.

Data analyzed using the Taguchi method revealed the critical effects of processing parameters on mechanical properties. The highest compressive strength (339.1 MPa) and toughness values were obtained with a 3-h ball milling time and a 3-layer FGM structure, while sintering parameters of 590 °C and 3 h, while 550 °C and 2 h provided the highest hardness (170 HB). In powder characterization, it was observed that as the grinding time increased, the particle size decreased and the B₄C phase was homogeneously distributed, despite the initial agglomeration tendency.

The results and parameter optimizations obtained through Taguchi analysis provide a comprehensive reference for further research. The analyses clearly show that the production recipe changes depending on the targeted property (pressure resistance, hardness, or density). The developed FGM composites can be used in applications such as arm and knee protectors thanks to their high strength and toughness properties, as well as the high hardness advantage they provide. Additionally, the combination of wear resistance and toughness resulting from high hardness offers great potential for future studies such as brake discs.

这项研究旨在开发由A7075铝/碳化硼（B4C）制成的混合复合材料，该材料具有坚硬的外部区域和柔软的内部核心，灵感来自牙齿和骨骼等自然结构，以提供高韧性。采用粉末冶金方法，根据功能梯度材料（FGM）原理，采用球磨时间（1、2、3 h）和层数（3、5、7层）进行生产。实验采用田口法进行系统优化，研究了3种不同的压缩压力（300、400、500 MPa）、烧结时间（1、2、3 h）和烧结温度（550、570、590℃）。在生产前用XRD， SEM和粒度分析对粉末进行了表征。采用ASTM E9标准的抗压强度测试、硬度和密度测试以及SEM显微组织分析对复合材料的性能进行了评价。使用田口方法分析的数据揭示了加工参数对机械性能的关键影响。当球磨时间为3 h，采用3层FGM结构时，合金的抗压强度和韧性最高，为339.1 MPa；烧结温度为590℃，烧结时间为3 h，烧结温度为550℃，烧结时间为2 h，硬度最高，为170 HB。在粉体表征中发现，随着磨矿时间的延长，B4C相粒度减小，B4C相分布均匀，但初始有团聚的倾向。田口分析的结果和参数优化为进一步的研究提供了全面的参考。分析清楚地表明，生产配方的变化取决于目标性能（耐压性、硬度或密度）。开发的FGM复合材料由于其高强度和韧性，以及它们提供的高硬度优势，可用于手臂和膝盖保护等应用。此外，高硬度的耐磨性和韧性的结合为未来的研究提供了巨大的潜力，如制动盘。

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引用次数: 0

Exploring the biomedical and photocatalytic potential of copper oxide modified PdCo2S3–Mo3S6 nanostructures 探索氧化铜修饰PdCo2S3-Mo3S6纳米结构的生物医学和光催化潜力

IF 4.7 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2026-01-21 DOI: 10.1016/j.matchemphys.2026.132075

Irshad Hussain , Kamran Tahir , Muhammad Saud Khan , Afaq Ullah Khan , Sameerah I. Al-Saeedi , Eman A. Alabbad , Khulood Fahad Alabbosh , Magdi E.A. Zaki , Zainab M. Almarhoon , Hatem A. Al-Aoh

This study reports the fabrication of CuO/PdCo₂S₃–Mo₃S₆ nanocomposite synthesized via hydrothermal method for integrated photocatalytic and antibacterial applications. The presence of nanoscale crystallinity within the monoclinic CuO and spinel PdCo₂S₃ was validated through XRD. SEM and TEM findings supported the theory of great interfacial contact, showing the morphological change from nanosheets to a dense granular form with CuO evenly distributed. Interpretations of BET patterns indicated a Type IV isotherm, with the surface area of the composite measured at roughly 115.6 m²/g and with mesopores at 4–6 nm. Under the influence of visible light, the composite demonstrated over 96.8 % of Bromothymol Blue (BTB) degradation with retention of at least 80 % degradation efficiency throughout a period of 6 reaction cycles. The composite also demonstrated antibacterial properties giving inhibition zones of 20 ± 0.12 mm against Staphylococcus aureus (S. aureus) and 18 ± 0.16 mm against Escherichia coli (E. coli) with minimum inhibitory concentration (MIC) of 25 μg/mL and 40 μg/mL, respectively, close to streptomycin (20 μg/mL). Although the material exhibited minimal hemolysis (<10.1 % at 150 μg/mL), suggesting good compatibility with red blood cells, additional investigation is required to fully determine its genotoxic profile and overall biological safety. These results demonstrate that CuO/PdCo₂S₃–Mo₃S₆ is a promising, stable, and safe multifunctional nanomaterial for visible-light-driven water purification and antimicrobial applications.

本文报道了水热法合成CuO/ PdCo2S3-Mo3S6纳米复合材料的制备及其光催化和抗菌的综合应用。通过XRD验证了单斜晶CuO和尖晶石PdCo2S3的纳米级结晶度。扫描电镜和透射电镜结果支持界面接触理论，显示了纳米片的形态变化到致密的颗粒形式，CuO均匀分布。BET模式的解释显示为IV型等温线，复合材料的表面积约为115.6 m2/g，介孔约为4-6 nm。在可见光的作用下，该复合材料在6个反应周期内对溴百里酚蓝（BTB）的降解率超过96.8%，降解效率保持在80%以上。该复合材料对金黄色葡萄球菌（S. aureus）和大肠杆菌（E. coli）的抑制区分别为20±0.12 mm和18±0.16 mm，最低抑制浓度（MIC）分别为25 μg/mL和40 μg/mL，接近链霉素（20 μg/mL）。虽然该材料在150 μg/mL时溶血率最低（10.1%），表明与红细胞具有良好的相容性，但需要进一步的研究来充分确定其遗传毒性特征和总体生物安全性。这些结果表明，CuO/ PdCo2S3-Mo3S6是一种有前途的、稳定的、安全的多功能纳米材料，可用于可见光驱动水净化和抗菌应用。

{"title":"Exploring the biomedical and photocatalytic potential of copper oxide modified PdCo2S3–Mo3S6 nanostructures","authors":"Irshad Hussain , Kamran Tahir , Muhammad Saud Khan , Afaq Ullah Khan , Sameerah I. Al-Saeedi , Eman A. Alabbad , Khulood Fahad Alabbosh , Magdi E.A. Zaki , Zainab M. Almarhoon , Hatem A. Al-Aoh","doi":"10.1016/j.matchemphys.2026.132075","DOIUrl":"10.1016/j.matchemphys.2026.132075","url":null,"abstract":"<div><div>This study reports the fabrication of CuO/PdCo<sub>2</sub>S<sub>3</sub>–Mo<sub>3</sub>S<sub>6</sub> nanocomposite synthesized via hydrothermal method for integrated photocatalytic and antibacterial applications. The presence of nanoscale crystallinity within the monoclinic CuO and spinel PdCo<sub>2</sub>S<sub>3</sub> was validated through XRD. SEM and TEM findings supported the theory of great interfacial contact, showing the morphological change from nanosheets to a dense granular form with CuO evenly distributed. Interpretations of BET patterns indicated a Type IV isotherm, with the surface area of the composite measured at roughly 115.6 m<sup>2</sup>/g and with mesopores at 4–6 nm. Under the influence of visible light, the composite demonstrated over 96.8 % of Bromothymol Blue (BTB) degradation with retention of at least 80 % degradation efficiency throughout a period of 6 reaction cycles. The composite also demonstrated antibacterial properties giving inhibition zones of 20 ± 0.12 mm against <em>Staphylococcus aureus</em> (<em>S. aureus</em>) and 18 ± 0.16 mm against <em>Escherichia coli</em> (<em>E. coli</em>) with minimum inhibitory concentration (MIC) of 25 μg/mL and 40 μg/mL, respectively, close to streptomycin (20 μg/mL). Although the material exhibited minimal hemolysis (<10.1 % at 150 μg/mL), suggesting good compatibility with red blood cells, additional investigation is required to fully determine its genotoxic profile and overall biological safety. These results demonstrate that CuO/PdCo<sub>2</sub>S<sub>3</sub>–Mo<sub>3</sub>S<sub>6</sub> is a promising, stable, and safe multifunctional nanomaterial for visible-light-driven water purification and antimicrobial applications.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"353 ","pages":"Article 132075"},"PeriodicalIF":4.7,"publicationDate":"2026-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146080229","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Dopant-induced structural modulation and enhanced photosensing response in Mn-doped ZnO nanoparticles prepared by co-precipitation 共沉淀法制备mn掺杂ZnO纳米粒子的掺杂诱导结构调制和增强的光敏响应

IF 4.7 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2026-01-21 DOI: 10.1016/j.matchemphys.2026.132113

M. Anujency , M. Mohamed Ibrahim , S. Vinoth , A. Anto Jeffery , Krishnakumar Balu , Mohanraj Kumar , H. Algarni , Mohd Shkir

In the present work, a detailed study was conducted to assess the photosensing performance of pure and Mn-doped ZnO nanoparticles synthesized via the co-precipitation method, with Mn concentrations ranging from 0 to 5 wt%. X-ray diffraction (XRD) confirmed that all samples crystallize in the hexagonal wurtzite structure with the P6₃mc space group. Field Emission Scanning Electron Microscopy (FESEM) revealed quasi-spherical particle morphology, while Energy Dispersive X-ray Spectroscopy (EDX) verified the successful incorporation of Mn ions into the ZnO lattice. UV–Vis absorption analysis indicated slight bandgap modulation upon doping, with values of 3.30 eV (pure), 3.27 eV (1 %), 3.28 eV (3 %), and 3.26 eV (5 %). Photoluminescence (PL) spectra showed that the 3 % Mn-doped sample exhibited the strongest emission intensity, implying enhanced charge carrier separation and radiative recombination efficiency. Correspondingly, this composition also achieved the highest responsivity (R), detectivity (D∗), and external quantum efficiency (EQE), marking it as the most efficient photosensing material among the studied samples. Overall, the results demonstrate that Mn doping significantly enhances the optoelectronic properties of ZnO, with 3 % Mn-doped ZnO emerging as a highly promising candidate for UV photodetector applications.

在本工作中，详细研究了通过共沉淀法合成的纯ZnO纳米粒子和Mn掺杂ZnO纳米粒子的光敏性能，Mn浓度范围为0 ~ 5 wt%。x射线衍射（XRD）证实，所有样品均结晶为具有P63mc空间基团的六方纤锌矿结构。场发射扫描电镜（FESEM）显示了准球形颗粒的形貌，而能量色散x射线光谱（EDX）证实了Mn离子成功进入ZnO晶格。紫外可见吸收分析表明掺杂后的带隙有轻微的调制，其值分别为3.30 eV（纯）、3.27 eV（1%）、3.28 eV（3%）和3.26 eV（5%）。光致发光（PL）光谱显示，3% mn掺杂样品的发射强度最强，表明载流子分离和辐射复合效率增强。相应地，该组合物也获得了最高的响应率(R)，探测率（D *）和外量子效率（EQE），标志着它是在所研究样品中最有效的光敏材料。总体而言，结果表明Mn掺杂显著增强了ZnO的光电性能，其中3% Mn掺杂ZnO成为紫外光电探测器应用的极有前途的候选者。

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引用次数: 0

Extraction of niobium from low-grade niobium tailings by molten oxide electrolysis 熔融氧化电解法从低品位铌尾矿中提取铌

IF 4.7 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2026-01-21 DOI: 10.1016/j.matchemphys.2026.132092

Xu Zhang , Zengwu Zhao , Liqi Zhang , Bowen Huang , Yusheng Yang

Numerous undeveloped and underutilized niobium deposits are located inside Bayan Obo's tailings. Niobium is challenging to extract from low-grade niobium slag using traditional methods. In this work, molten oxide electrolysis was used to prepare metallic niobium and niobium-iron alloys. Our findings reveal that the reduction of Nb(V) on a tungsten electrode operates through a two-step, five-electron transfer process: Nb(V) → Nb(II) and Nb(II) → Nb(0). Meanwhile, on an solid iron electrode, the reduction follows a three-step process: Nb(V) → Nb(IV), Nb(IV) → Nb(II) and Nb(II) → Nb(0). In the co-deposition approach, Fe(III) is first deposited on the tungsten electrode to form a Fe film through the reaction Fe(III) + 3e → Fe(0). Subsequently, Nb(V) is reduced on this iron film, yielding NbFe intermetallic compounds. Additionally, we examined the transport and diffusion rates of Nb ions as they transition to Nb(0) on inert tungsten, solid iron, and during co-deposition. The results highlight that the co-deposition method yields FeNb and Fe₂Nb alloys that are easier to separate and demonstrate superior diffusivity, with D_Nb(II) measured at 1.80 × 10⁻⁵ cm² s⁻¹ during the reduction process. This research highlights a promising pathway toward enhancing niobium production and utilization in high-demand industries.

许多未开发和未充分利用的铌矿床位于巴彦鄂博的尾矿中。用传统方法从低品位铌渣中提取铌是一个挑战。本文采用氧化液电解法制备金属铌和铌铁合金。我们的研究结果表明，铌(V)在钨电极上的还原是通过两步五电子转移过程进行的：Nb(V)→Nb（II）和Nb（II）→Nb(0)。同时，在固体铁电极上，还原过程分为Nb(V)→Nb（IV）、Nb（IV）→Nb（II）和Nb（II）→Nb(0)三步。在共沉积方法中，首先将Fe（III）沉积在钨电极上，通过Fe(III) + 3e→Fe(0)反应形成Fe膜。随后，Nb(V)在铁膜上被还原，生成NbFe金属间化合物。此外，我们还研究了Nb离子在惰性钨、固体铁和共沉积过程中转变为Nb(0)时的传输和扩散速率。结果表明，共沉积法制备的FeNb和Fe2Nb合金更容易分离，并表现出优异的扩散系数，在还原过程中测得DNb（II）为1.80 × 10−5 cm2 s−1。这项研究强调了在高需求行业中提高铌生产和利用的有希望的途径。

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引用次数: 0

Hierarchical ZnS/MXene microspheres as efficient electrodes for energy storage devices 层次化ZnS/MXene微球作为储能装置的高效电极

IF 4.7 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2026-01-21 DOI: 10.1016/j.matchemphys.2026.132108

Muti ul Mannan Shah , Abdul Shakoor , Waseem Abbas , Muhammad Hashim , Muhammad Bilal , Muhammad Ehsan Mazhar , Shahid Atiq , Sami Allah , Imran Shakir , Muhammad Yahya Haroon , Latif Ullah Khan , Muhammad Junaid , Farooq Ahmad

This work introduces hydrothermally synthesized pure ZnS and ZnS/MXene-based composite as electrode materials for supercapacitors to enhance their electrochemical properties. X-ray diffraction (XRD) analysis indicated that both ZnS and ZnS/MXene-based material possess high phase purity and crystallinity. Scanning Electron Microscopy (SEM) confirmed that the MXene substrate was porous with evenly dispersed spherical ZnS micro spheres. Transmission electron microscopy (TEM), selected area electron microscopy (SEAD), and HRTEM unveiled the in-depth morphological and crystallographic attributes of the composite sample. Additionally, X-ray photoelectron spectroscopy (XPS) verified the presence and variety of oxidation states in each component of both samples. Electrochemical tests showed that ZnS/MXene-based composite electrodes exhibited enhanced electrochemical efficiency in comparison to pure ZnS electrodes, attaining a maximum specific capacitance value of 2495.07 F/g at 10 mV/s. Such a composite also exhibited improved power density (1500 W/kg) and energy density (129.11 Wh/kg) at 3 A/g. The stability test of ZnS/MXene resulted in a retained capacitance of approximately 95.20 % after 2000 GCD cycles with a 3 A/g current density. The composite material demonstrated excellent ionic conductivity (0.0698 S/cm), very low charge transfer resistance (0.094 Ω), and a transference number of 0.82 for anions. Based on these results, ZnS/MXene-based composite electrodes are proposed as advanced electrode materials for high-performance supercapacitors.

本文介绍了水热合成纯ZnS和ZnS/ mxene基复合材料作为超级电容器电极材料，以提高其电化学性能。x射线衍射（XRD）分析表明，ZnS和ZnS/ mxene基材料均具有较高的相纯度和结晶度。扫描电子显微镜（SEM）证实MXene衬底具有均匀分散的球形ZnS微球。透射电子显微镜（TEM）、选择性面积电子显微镜（SEAD）和HRTEM揭示了复合材料样品的深层形态和晶体属性。此外，x射线光电子能谱（XPS）验证了两种样品中各组分氧化态的存在和变化。电化学测试表明，与纯ZnS电极相比，ZnS/ mxene基复合电极的电化学效率有所提高，在10 mV/s下的最大比电容值为2495.07 F/g。这种复合材料在3 a /g时也表现出更高的功率密度（1500 W/kg）和能量密度（129.11 Wh/kg）。ZnS/MXene稳定性测试结果表明，在3 a /g电流密度下，经过2000个GCD循环后，ZnS/MXene的电容保留率约为95.20%。复合材料具有优异的离子电导率（0.0698 S/cm），极低的电荷转移电阻（0.094 Ω），阴离子转移数为0.82。基于这些结果，提出了ZnS/ mxene基复合电极作为高性能超级电容器的先进电极材料。

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引用次数: 0

Harnessing Sm/PAA-CuFe2O4 nanostructures for synergistic catalytic and bioactivity: A computationally-guided approach 利用Sm/PAA-CuFe2O4纳米结构进行协同催化和生物活性：一种计算指导的方法

IF 4.7 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2026-01-21 DOI: 10.1016/j.matchemphys.2026.132091

Amna Seher , Muhammad Imran , Iram Shahzadi , Sawaira Moeen , Anwar Ul-Hamid , Norah A. Albassami , Sarmad Frogh Arshad , Muhammad Ikram

In this work, a co-precipitation approach was used to synthesize CuFe₂O₄ NSs (copper ferrite nanostructures) doped with different concentrations of samarium (Sm) and a fixed amount of polyacrylic acid (PAA). This study aimed to examine the effect of doping agents (Sm and PAA) on the degradation potency and antibacterial ability of CuFe₂O₄ NSs. Sm and capping agent (PAA) were added to CuFe₂O₄ as they improved the crystalinity, enhanced the stability and restricts the recomibination of exicitons by decreasing the bandgap energy of NSs. PAA functional groups (-COOH) offers additional active sites, while Sm provides additional energy levels to improve the charge transfer activities for the catalytic reduction of rhodamine B dye (RhB) and antibacterial behaviour against Staphylococcus aureus (S. aureus). Moreover, prepared catalysts were characterized optically, structurally, and morphologically. 4 wt % Sm/PAA-doped CuFe₂O₄ demonstrated the maximum reduction (94.8 %) of RhB in a neutral environment and inhibitory zone (11.35 mm) against S. aureus. The microbicidal efficacy of Sm/PAA-doped CuFe₂O₄ against S. aureus DNA gyrase was elucidated using molecular docking research, indicating these NCs as DNA gyrase_{S. aureus} inhibitors.

本文采用共沉淀法合成了掺杂不同浓度钐（Sm）和一定量聚丙烯酸（PAA）的CuFe2O4纳米铁酸铜（NSs）。本研究旨在研究掺杂剂（Sm和PAA）对CuFe2O4 NSs降解效能和抗菌能力的影响。在CuFe2O4中加入Sm和封盖剂（PAA）可以改善结晶度，增强稳定性，并通过降低NSs的带隙能来限制激发的复合。PAA官能团（-COOH）提供了额外的活性位点，而Sm提供了额外的能级，以提高罗丹明B染料（RhB）的催化还原和对金黄色葡萄球菌（S. aureus）的抗菌行为的电荷转移活性。此外，对制备的催化剂进行了光学、结构和形貌表征。4 wt % Sm/ paa掺杂CuFe2O4在中性环境下对RhB的最大还原（94.8%）和对金黄色葡萄球菌的抑制区（11.35 mm）。通过分子对接研究，阐明了Sm/ paa掺杂CuFe2O4对金黄色葡萄球菌DNA旋切酶的杀微生物效果，表明这些NCs是DNA旋切酶。球菌抑制剂。

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引用次数: 0

Investigation on the corrosion properties of Al-Epoxy/Zn based bilayer hybrid coatings on cold rolled steel 冷轧钢al -环氧/Zn基双层复合涂层腐蚀性能研究

IF 4.7 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2026-01-21 DOI: 10.1016/j.matchemphys.2026.132098

Shaik Merkatur Hakim Marjuban , Deeparekha Narayanan , Victor Ponce Valderrama , Ulises Martin , Heather Eich , Allison Mahood , Rishi Gupta , Homero Castaneda

This study investigates the long-term corrosion behavior of a bilayer aluminum-epoxy (Al-EP) and zinc rich inorganic coating system designed to integrate barrier and sacrificial protection mechanisms. An Al-EP/Zn coating with a well-defined bilayer architecture was fabricated using a dip-spin deposition technique to achieve uniform and reproducible layers, as confirmed by scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). The corrosion performance was evaluated under extended exposure conditions, with electrochemical and environmental testing conducted for periods up to 150 days, exceeding the duration commonly reported in the literature for similar coating systems. Electrochemical impedance spectroscopy (EIS), open-circuit potential (OCP) monitoring, and salt spray testing revealed a time-dependent evolution of corrosion protection, in which early-stage cathodic protection provided by the Zn-rich layer progressively transitions toward barrier-dominated behavior due to corrosion product formation. Inductively coupled plasma mass spectrometry (ICP-MS) confirmed controlled Zn²⁺ release during immersion, while X-ray diffraction (XRD) identified the formation of ZnO and simonkolleite (Zn₅(OH)₈Cl₂·H₂O), which contribute to pore blocking and enhanced barrier resistance over prolonged exposure. Secondary ion mass spectrometry (SIMS) depth profiling further demonstrated electrolyte penetration pathways and layer-specific depletion behavior, enabling correlation between microstructural evolution and long-term electrochemical response.

本研究研究了一种结合屏障和牺牲保护机制的双层铝环氧树脂（Al-EP）和富锌无机涂层体系的长期腐蚀行为。通过扫描电子显微镜（SEM）和能量色散x射线能谱（EDS）证实，采用浸自旋沉积技术制备了具有良好定义的双层结构的Al-EP/Zn涂层。在长时间暴露条件下评估了腐蚀性能，并进行了长达150天的电化学和环境测试，超过了文献中类似涂层系统通常报道的持续时间。电化学阻抗谱（EIS）、开路电位（OCP）监测和盐雾测试揭示了腐蚀保护的时间依赖性演变，其中富锌层提供的早期阴极保护随着腐蚀产物的形成逐渐过渡到以势挡为主的行为。电感耦合等离子体质谱（ICP-MS）证实了浸渍过程中Zn2+的释放受到控制，而x射线衍射（XRD）证实了ZnO和单晶石（Zn5(OH)8Cl2·H2O）的形成，这有助于堵塞孔，并在长时间的浸渍中增强屏障电阻。二次离子质谱（SIMS）深度谱进一步证明了电解质渗透途径和层特异性耗尽行为，从而实现了微观结构演变与长期电化学响应之间的关联。

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