Diamond and Related Materials最新文献_第7页

Formation of Si-related color center at 720–722 nm in CVD-grown diamond cvd生长金刚石中720-722 nm硅相关色心的形成

IF 5.1 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials

Pub Date : 2026-01-06 DOI: 10.1016/j.diamond.2026.113300

Artem Martyanov , Renata Romashchenko , Ivan Tiazhelov , Margarita Pavlenko , Ivan Eremchev , Andrey Naumov , Sergey Savin , Alexander Khomich , Nikolay Kargin , Vitaly Konov , Vadim Sedov

Silicon-doped polycrystalline diamond (PCD) films were grown by microwave-plasma chemical vapor deposition (MPCVD) from H₂-CH₄-SiH₄ precursor gas mixtures at substrate temperatures between 850 and 1100 °C. Photoluminescence (PL) measurements revealed, in addition to the characteristic negatively charged silicon–vacancy (SiV⁻) zero-phonon line (ZPL) at ~738 nm, a narrow emission from a Si-related color center at 720–722 nm with maximum intensity for growth at 900 °C. Combined Raman spectroscopy, scanning electron microscopy in backscattered-electron mode (SEM-BSE), and spatially resolved PL mapping confirmed that this emission originates from the diamond phase rather than from incidental 3C-SiC inclusions, and its strong presence despite the absence of boron dopants excludes interpretations linking this center to B-related complexes. Low-temperature PL at 7.8 K with high spectral resolution (0.028 nm) showed the 720 nm band to consist of multiple ultranarrow, polarization-dependent ZPL components, indicating a family of distinct silicon-related point defects. These results provide new insight into the unresolved nature of the 720–722 nm color center in diamond and highlight its potential for quantum-photonic and bio-optical sensing applications.

采用微波等离子体化学气相沉积（MPCVD）技术，在850 ~ 1100℃的衬底温度下，从H2-CH4-SiH4前驱体气体混合物中生长出掺硅多晶金刚石（PCD）薄膜。光致发光（PL）测量显示，除了在~738 nm处具有典型的负电荷硅空位（SiV−）零声子线（ZPL）外，在720-722 nm处，硅相关色中心有窄发射，在900°C下生长时强度最大。综合拉曼光谱、背散射电子模式扫描电镜（SEM-BSE）和空间分辨PL映射证实，这种发射来自金刚石相，而不是偶然的3C-SiC夹杂物，尽管没有硼掺杂，但它的强烈存在排除了将该中心与b相关配合物联系起来的解释。7.8 K高光谱分辨率（0.028 nm）的低温PL显示，720 nm波段由多个超窄、偏振相关的ZPL组分组成，表明存在一系列明显的硅相关点缺陷。这些结果为钻石中720-722 nm色心的未解性质提供了新的见解，并突出了其在量子光子和生物光学传感应用中的潜力。

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引用次数: 0

Biogenic synthesis of N-doped carbon dots from bamboo stems for targeted cancer cell bioimaging 竹茎生物合成n掺杂碳点用于靶向癌细胞生物成像

IF 5.1 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials

Pub Date : 2026-01-06 DOI: 10.1016/j.diamond.2026.113302

Kaviyapriya Kirubanithy , Mohamad S. Alsalhi , Sandhanasamy Devanesan , Amutha Santhanam

The application of organic compound-based fluorescent material for bioimaging has several drawbacks, like photobleaching, toxicity, cell damage and high costs. Here, we propose carbon dots obtained from bamboo stems as a simple and cost-effective alternative. Nevertheless, a common drawback to biomass-derived carbon dots is the limited fluorescent intensity. To overcome this, ethylenediamine is used for doping the carbon dots. The N-doped carbon dots (N-CDs) are produced using a hydrothermal treatment. The combination of such improves the optical properties and reduces toxicity while incorporating the benefits of various phytochemicals present in the bamboo stems. While analysing the optical properties of the obtained N-CDs, the photoluminescent emission of the doped sample is found to be remarkably high compared to the undoped sample. The fluorescent quantum yield of 50.89% is obtained. Furthermore, its structure and morphology are studied, and the N-CDs are found to have an ultra-small size of 2.4 nm. The surface functional groups are examined from which N-CDs are identified to have great hydrophilicity. The N-CDs sample can be used for bioimaging of various cell types. Further, the N-CDs are conjugated with folic acid (FA-CDs) to facilitate folate receptor (FR)-mediated targeted imaging of cancer cells. For this, HepG2 cells are selected as the FR-positive cells, and NIH/3T3 cells are utilised for FR-negative cells. The high fluorescent intensity of the sample enables it to produce great images under a fluorescent microscope, and can be used as a great alternative to carcinogenic dyes.

有机化合物基荧光材料在生物成像中的应用存在光漂白、毒性、细胞损伤和成本高等缺点。在这里，我们提出从竹茎中提取碳点作为一种简单而经济的替代品。然而，生物质衍生的碳点的一个共同缺点是有限的荧光强度。为了克服这个问题，用乙二胺掺杂碳点。采用水热法制备了n掺杂碳点（N-CDs）。这种组合改善了光学性能，降低了毒性，同时结合了竹茎中存在的各种植物化学物质的好处。在分析得到的N-CDs的光学性质时，发现掺杂样品的光致发光发射比未掺杂样品明显高。获得了50.89%的荧光量子产率。进一步研究了其结构和形貌，发现N-CDs具有2.4 nm的超小尺寸。研究了表面官能团，鉴定出N-CDs具有很强的亲水性。N-CDs样品可用于各种细胞类型的生物成像。此外，N-CDs与叶酸（FA-CDs）结合，促进叶酸受体（FR）介导的癌细胞靶向成像。为此，选择HepG2细胞作为fr阳性细胞，NIH/3T3细胞作为fr阴性细胞。样品的高荧光强度使其能够在荧光显微镜下产生出色的图像，并且可以用作致癌染料的绝佳替代品。

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引用次数: 0

Nitrogen vacancy-rich graphitic carbon nitride nanosheets synthesised via short-time annealing in Al foil-sealed crucibles for efficient photocatalytic organic decomposition and bacterial inactivation 在铝箔密封坩埚中短时间退火制备富氮空位石墨氮化碳纳米片，用于高效光催化有机分解和细菌灭活

IF 5.1 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials

Pub Date : 2026-01-05 DOI: 10.1016/j.diamond.2026.113290

Retsuo Kawakami , Atsunori Ichimura , Shin-ichiro Yanagiya , Akihiro Shirai , Koichiro Tsuchiya , Yoshitaka Nakano , Masahito Niibe

Defect engineering of graphitic carbon nitride (g-C₃N₄) is a promising strategy to enhance its photocatalytic performance. We propose a facile method for fabricating g-C₃N₄ nanosheets with superior photocatalytic activity in a short processing time. In this method, g-C₃N₄ nanosheets were synthesised by annealing urea at 500 °C for 1 h in a lidded crucible sealed with Al foil. For comparison, g-C₃N₄ nanosheets were prepared using a conventional method, in which urea was annealed at 575 °C for 4 h in an unsealed lidded crucible. The g-C₃N₄ nanosheets synthesised using the proposed method exhibited larger sheet sizes and demonstrated enhanced performance in organic decomposition and bacterial inactivation. This enhancement originates from abundant nitrogen vacancies introduced below the conduction band edge, broadening the conduction band edge and narrowing the band gap. The nitrogen vacancies trap photogenerated electrons, facilitate the charge separation, and increase the photogenerated carrier concentration, thereby enhancing photocatalytic performance. The introduction of nitrogen vacancies could originate from efficient heating and elevated internal pressure inside the crucible during annealing. This improved thermal and pressure environment could enhance air convection currents, increase the heat transfer to urea, and either directly promote nitrogen atom removal or promote the formation of intermediate compounds associated with nitrogen atom removal. These combined effects could facilitate the introduction of nitrogen vacancies. They could also contribute to the growth of larger g-C₃N₄ nanosheets. The present study provides a time-efficient approach for tuning defect chemistry in g-C₃N₄, emphasizing the critical role of thermal and pressure control during synthesis.

石墨氮化碳（g-C3N4）的缺陷工程是提高其光催化性能的一种很有前途的策略。我们提出了一种在短加工时间内制备具有优异光催化活性的g-C3N4纳米片的简便方法。在该方法中，g-C3N4纳米片是在铝箔密封的有盖坩埚中，在500℃下退火1 h合成的。为了比较，采用常规方法制备了g-C3N4纳米片，其中尿素在不密封的盖子坩埚中在575°C下退火4 h。使用该方法合成的g-C3N4纳米片具有更大的薄片尺寸，并且在有机分解和细菌灭活方面表现出更高的性能。这种增强是由于在导带边缘以下引入了丰富的氮空位，使导带边缘变宽，带隙变小。氮空位捕获光生电子，促进电荷分离，增加光生载流子浓度，从而提高光催化性能。氮空位的产生可能是由于热处理过程中坩埚内部的有效加热和内部压力的升高。这种改善的热压力环境可以增强空气对流，增加对尿素的传热，直接促进氮原子的去除或促进与氮原子去除相关的中间化合物的形成。这些综合效应可以促进氮空位的引入。它们还可以促进更大的g-C3N4纳米片的生长。本研究为g-C3N4的缺陷化学调整提供了一种高效的方法，强调了合成过程中热压力控制的关键作用。

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引用次数: 0

Engineering PdCo bimetallic catalysts on multi-walled carbon nanotubes via Pd/Co ratio regulation for enhanced electrocatalytic ethanol oxidation: Synergistic effect and electronic structure optimization 多壁碳纳米管上PdCo双金属催化剂的Pd/Co比调控：协同效应和电子结构优化

IF 5.1 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials

Pub Date : 2026-01-05 DOI: 10.1016/j.diamond.2025.113289

Bairui Tao , Chengyu Tao , Fengjuan Miao , Peng Zhang

In this study, a series of PdCo bimetallic catalysts (Pd1Co1/C, Pd1Co2/C, Pd1Co5/C) were designed and prepared using multi-walled carbon nanotubes (MWCNTs) as supports, leveraging the strong reducing effect of sodium borohydride (NaBH₄) and bimetallic synergistic interactions. The objective was to optimize the electrocatalytic ethanol oxidation performance by tuning the Pd/Co ratio, with a target metal loading of approximately 0.3 mg/cm². Experimental results show that the introduction of Co modulates the d-band center of Pd through electronic effects, weakening the strong adsorption of intermediates (such as Co-like species and acetaldehyde), while the high electrical conductivity and specific surface area of MWCNTs significantly enhance the dispersion of active sites and electron transfer efficiency. Electrochemical tests indicate that Pd1Co2/C exhibits the optimal catalytic activity, with a Tafel slope as low as 24.15 mV dec⁻¹, an exchange current density of 4430 mA/g, a specific capacitance (Cs) of 4.3 mF/cm², and an electrochemical active surface area of 6.58m²/g. This is attributed to the synergistic promotion of reaction kinetics by the PdCo alloy structure and the stabilizing effect of the support on nanoparticles. XRD and TEM characterizations further confirm the interatomic interactions of the bimetallic system and uniform loading characteristics. This work investigates the influence of Pd/Co ratio adjustment on the electrocatalytic ethanol oxidation performance of bimetallic catalysts, revealing the critical role of the bimetallic ratio in optimizing reaction kinetics and intermediate adsorption behavior. The findings provide experimental insights for the design of efficient anode catalysts for direct ethanol fuel cells (DEFCs).

本研究以多壁碳纳米管（MWCNTs）为载体，利用硼氢化钠（NaBH4）的强还原作用和双金属协同作用，设计并制备了一系列PdCo双金属催化剂（Pd1Co1/C、Pd1Co2/C、Pd1Co5/C）。目的是通过调整Pd/Co比来优化电催化乙醇氧化性能，目标金属负载约为0.3 mg/cm2。实验结果表明，Co的引入通过电子效应调节了Pd的d带中心，减弱了中间体（如Co样物质和乙醛）的强吸附，而MWCNTs的高电导率和高比表面积显著增强了活性位点的分散和电子转移效率。电化学测试表明，Pd1Co2/C具有最佳的催化活性，其塔菲尔斜率低至24.15 mV dec−1，交换电流密度为4430 mA/g，比电容（Cs）为4.3 mF/cm2，电化学活性表面积为6.58m2/g。这是由于PdCo合金结构对反应动力学的协同促进和载体对纳米颗粒的稳定作用。XRD和TEM表征进一步证实了双金属体系的原子间相互作用和均匀加载特性。本研究考察了Pd/Co配比调整对双金属催化剂电催化乙醇氧化性能的影响，揭示了双金属配比在优化反应动力学和中间吸附行为中的关键作用。该研究结果为直接乙醇燃料电池（DEFCs）高效阳极催化剂的设计提供了实验见解。

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引用次数: 0

Analysis of an incomplete interphase in carbon nanofiber polymer composites: A new approach for conductivity improvement 纳米碳纤维聚合物复合材料中不完全界面相的分析：一种提高电导率的新方法

IF 5.1 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials

Pub Date : 2026-01-05 DOI: 10.1016/j.diamond.2025.113288

Yasser Zare , Muhammad Tajammal Munir , Soo-Jin Park , Jin-Hwan Choi , Kyong Yop Rhee

While many nanocomposites have an incomplete interphase, this feature has not been fully explored concerning the conductivity for carbon nanofiber (CNF)/polymer samples (PCNFs). This paper models the incomplete interphase in PCNFs, represented by L_c, as the minimum CNF length necessary to achieve effective conduction transfer to the polymer matrix. The effective inverse aspect ratio and CNF concentration are functions of L_c. Also, percolation inception (ϕ_p) and network concentration in PCNFs are estimated through effective parameters. A simplified model is subsequently refined to predict PCNF conductivity, incorporating both the incomplete interphase and tunneling effect. Extensive experimental data validate the model's predictions. Furthermore, the impact of each parameter on PCNF conductivity is thoroughly analyzed to substantiate the proposed simulation. Insulative behavior is shown in samples with large tunneling distances (λ > 5.5 nm), low interphase conductivity (< 50 S/m), minimal interphase depth (t < 9 nm), L_c > 14 μm, or ϕ_p > 0.015. Hence, attaining better PCNF conductivity necessitates shorter tunneling distance, higher interphase conductivity, greater interphase depth, smaller L_c, and lower percolation inception.

虽然许多纳米复合材料具有不完全间相，但在纳米碳纤维/聚合物样品（pcnf）的电导率方面，这一特征尚未得到充分的探讨。本文将pcnf中的不完全间期（以Lc表示）建模为实现有效传导转移到聚合物基体所需的最小CNF长度。有效纵横比和CNF浓度是Lc的函数。此外，通过有效参数估计了pcnf中的渗透起始（ϕp）和网络浓度。一个简化的模型随后被改进以预测PCNF的电导率，同时考虑了不完全间相和隧道效应。大量的实验数据证实了该模型的预测。此外，深入分析了各参数对PCNF电导率的影响，以证实所提出的模拟。在大隧穿距离（λ > 5.5 nm）、低间相电导率（< 50 S/m）、最小间相深度（t < 9 nm）、Lc >； 14 μm或ϕ >； 0.015的样品中显示出绝缘行为。因此，获得更好的PCNF导电性需要更短的隧道距离、更高的间相导电性、更大的间相深度、更小的Lc和更低的渗透起始。

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引用次数: 0

A switchable terahertz absorber with broadband and dual band responses based on graphene and strontium titanate metamaterial 基于石墨烯和钛酸锶超材料的宽带和双波段响应的可切换太赫兹吸收体

IF 5.1 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials

Pub Date : 2026-01-04 DOI: 10.1016/j.diamond.2025.113280

Hao Fu, Fang Chen, Wenxing Yang

We have designed a dynamically reconfigurable terahertz absorber based on a graphene and strontium titanate composite metamaterial. The device adopts a multilayer stacked structure (patterned graphene top layer/

{SiO}_{2}

/patterned graphene middle layer/

{SiO}_{2}

/STO/metal backplane) and utilizes a dual electrical and thermal tuning mechanism, enabling active switching between broadband and dual-narrowband absorption modes. The key to the design lies in the following: the middle layer, composed of concentric annular segments with similar dimensions, achieves broadband absorption from 0.86 to 1.87 THz (with an average absorptance of 95.99 %) through the superposition of excited resonance peaks; meanwhile, the top-layer cross and quarter-circle structures excite dual narrowband perfect absorption peaks at 1.33 THz and 1.85 THz, respectively, with absorptance exceeding 99.81 %. By adjusting the graphene Fermi level and temperature, the absorptance and resonance frequency can be dynamically tuned. This structure features symmetry, demonstrating excellent polarization insensitivity and wide-angle stability. The perfect absorption mechanism is verified through impedance matching theory and coupled-mode theory (CMT), providing a multifunctional reconfigurable device solution for terahertz communications, temperature sensors, and filters.

我们设计了一种基于石墨烯和钛酸锶复合超材料的动态可重构太赫兹吸收器。该器件采用多层堆叠结构（图像化石墨烯顶层/SiO2/图像化石墨烯中间层/SiO2/STO/金属背板），采用双电和热调谐机制，实现宽带和双窄带吸收模式之间的主动切换。设计的关键在于：中间层由尺寸相近的同心环形段组成，通过激发共振峰的叠加，实现0.86 ~ 1.87 THz的宽带吸收，平均吸光度为95.99%；顶层交叉和四分之一圆结构分别在1.33 THz和1.85 THz激发出双窄带完美吸收峰，吸光度超过99.81%。通过调节石墨烯的费米能级和温度，可以动态调节吸光度和共振频率。该结构具有对称性，具有良好的偏振不敏感性和广角稳定性。通过阻抗匹配理论和耦合模式理论（CMT）验证了完美的吸收机制，为太赫兹通信、温度传感器和滤波器提供了多功能可重构器件解决方案。

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引用次数: 0

Antibacterial activity enhancement of CoSe2/MWCNT nanocomposites against drug resistant Escherichia coli under visible irradiation 可见光下CoSe2/MWCNT纳米复合材料对耐药大肠杆菌的抗菌活性增强

IF 5.1 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials

Pub Date : 2026-01-04 DOI: 10.1016/j.diamond.2026.113296

Tasbandi Atena , M.E. Ghazi , Izadifard Morteza , O. Akhavan

This study presents a simple process for creating CoSe₂/MWCNTs nanocomposites and investigates the antibacterial properties of both pure CoSe₂ and CoSe₂/MWCNTs nanocomposites against Escherichia coli. The successful fabrication of samples was confirmed through characterization studies utilizing advanced experimental techniques as Raman spectroscopy, FE-SEM, TEM, and DRS. Under visible light illumination, the antibacterial activity of CoSe₂/MWCNTs nanocomposites is enhanced due to a synergistic effect suggesting the possible involvement of reactive oxygen species (ROS) generation via a photodynamic process as one of the effective mechanisms resulting in enhanced antibacterial activity against E. coli under the tested in vitro conditions. This study demonstrates the potential of CoSe₂ nanoparticles and their nanocomposites as effective antimicrobial agents for biomedical applications.

本研究提出了一种制备CoSe2/MWCNTs纳米复合材料的简单工艺，并研究了纯CoSe2和CoSe2/MWCNTs纳米复合材料对大肠杆菌的抗菌性能。通过利用先进的实验技术，如拉曼光谱、FE-SEM、TEM和DRS进行表征研究，证实了样品的成功制备。在可见光照射下，CoSe2/MWCNTs纳米复合材料的抗菌活性由于协同效应而增强，这表明在体外实验条件下，通过光动力过程产生活性氧（ROS）可能是导致对大肠杆菌抗菌活性增强的有效机制之一。本研究证明了CoSe2纳米颗粒及其纳米复合材料作为有效的生物医学抗菌剂的潜力。

引用次数: 0

Magnesium-aluminum layered double hydroxide/activated carbon nanocomposite for ultrasound-assisted removal of diclofenac from aqueous media 镁铝层状双氢氧化物/活性炭纳米复合材料超声辅助去除水中双氯芬酸

IF 5.1 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials

Pub Date : 2026-01-04 DOI: 10.1016/j.diamond.2026.113292

Fatemeh Darzi , Ali Akbar Amooey , Abdoliman Amouei , Shahram Ghasemi , Elham Omidbakhsh Amiri

The increase in the amount of pharmaceutical pollutants and their lack of treatment and discharge into the environment are gradually affecting the health of aquatic ecosystems and human life. In this study, magnesium-aluminum layered double hydroxide/activated carbon (MgAl LDH/AC) nanocomposite was prepared for ultrasonic-assisted removal of one of the emerging pharmaceutical contaminants, diclofenac sodium (DS), from aqueous solution. The structural investigation using X-ray diffraction, field emission scanning electron microscopy (FESEM) and transmission electron microcopy (TEM) showed the formation of MgAl LDH nanosheets with AC particles. The incorporation of MgAl-LDH with AC provides high specific surface area (196.04 m²/g) and large number of active sites for adsorption of DS species from aqueous solution. Additionally, it was observed that ultrasonic irradiation has positive effect on improvement of adsorbent performance for pollutant removal. To optimize the effect of possible parameters including initial pollutant concentration (30–300 mg/L), adsorbent dose (100–250 mg/L), duration (10–60 min), and initial pH (3–10) on removal efficiency of adsorbent, the design of experiments and the central cube rule response surface methodology (RSM) were used. Under ultrasonic irradiation, the predicted optimal conditions for the MgAl LDH/AC adsorbent were determined to be an initial concentration of 34 mg/L, an adsorbent dose of 228 mg/L, duration of 47 min and an initial pH of 6, equivalent to a maximum adsorption capacity of 909.08 mg/g. The ultrasonic irradiation has key role on the performance of adsorbent so higher removal efficiency was observed at power of 350 W (50 kHz). Moreover, the adsorption isotherms showed that the removal of DS by adsorbent follows the Freundlich model. The kinetics of DS adsorption process on MgAl LDH/AC followed a pseudo-second-order model. The stability test showed that the adsorbent still maintained its high adsorption capacity after four regeneration cycles which make it suitable for practical applications in polluted environment.

药物污染物数量的增加以及对其缺乏处理和排放到环境中，正逐渐影响着水生生态系统的健康和人类的生活。本研究制备了镁铝层状双氢氧化物/活性炭（MgAl LDH/AC）纳米复合材料，用于超声辅助去除水溶液中新兴的药物污染物双氯芬酸钠（DS）。利用x射线衍射、场发射扫描电镜（FESEM）和透射电镜（TEM）对MgAl LDH纳米片的结构进行了研究。MgAl-LDH与AC的掺入提供了高的比表面积（196.04 m2/g）和大量的活性位点，用于吸附水溶液中的DS物质。此外，超声波辐照对提高吸附剂去除污染物的性能有积极的作用。为了优化初始污染物浓度（30 ~ 300 mg/L）、吸附剂剂量（100 ~ 250 mg/L）、持续时间（10 ~ 60 min）和初始pH（3 ~ 10）对吸附剂去除效果的影响，采用了实验设计和中心立方规则响应面法（RSM）。超声照射下，MgAl LDH/AC吸附剂的最佳条件为初始浓度34 mg/L，吸附剂剂量228 mg/L，持续时间47 min，初始pH = 6，相当于最大吸附量为909.08 mg/g。超声辐照对吸附剂的性能起着关键作用，在350 W （50 kHz）的功率下，吸附剂的去除效率较高。吸附等温线表明，吸附剂对DS的去除符合Freundlich模型。MgAl LDH/AC对DS的吸附动力学符合准二阶模型。稳定性试验表明，该吸附剂经过4次再生循环后仍保持较高的吸附能力，适合在污染环境中实际应用。

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引用次数: 0

Wear mechanism of diamond wire in slicing of silicon wafers 金刚石丝在硅片切割中的磨损机理

IF 5.1 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials

Pub Date : 2026-01-04 DOI: 10.1016/j.diamond.2025.113284

Zhecan Cao , Peizhi Wang , Peiqi Ge , Wenbo Bi , Mengran Ge , Yandong Wang

The wear of diamond wire during wafer slicing not only increases manufacturing costs but also degrades wafer quality and may even lead to wafer rejection. Three primary forms of wire wear have been reported: blunting, fracture, and pull-out of diamond abrasives. However, the underlying wear mechanisms associated with these forms remain insufficiently understood. This study investigates the mechanisms corresponding to each wear form through a combination of slicing experiments, abrasive cut-depth analysis, and thermo-mechanical coupled finite element simulations. Results show that the flash temperature at the diamond tip during high-speed scratching on silicon can reach up to 825.47 K at a cut depth of 0.75 μm. This elevated temperature induces oxidation of the diamond tip, as observed in slicing experiments, which contributes to the rapid blunting of abrasives. The interaction at the contact interface generates both high compressive and tensile stresses. Notably, the tensile stress exceeds the fracture strength of the diamond material earlier than compressive stress, resulting in abrasive fracture. In addition, the pull-out of abrasives from the electroplated nickel matrix is closely related to the force acting on individual abrasives, which essentially depends on their cut depth. The statistical distribution of abrasive cut depths is found to follow a log-normal distribution. Abrasives with cut depths exceeding the critical retention strength are prone to being dislodged from the wire. The insights gained from this work provide a deeper understanding of abrasive wear behavior and offer practical implications for controlling and mitigating wear in wafer slicing, thereby reducing overall manufacturing costs.

在晶圆切片过程中，金刚石丝的磨损不仅会增加制造成本，而且会降低晶圆质量，甚至可能导致晶圆报废。钢丝磨损有三种主要形式：磨钝、断裂和金刚石磨料脱落。然而，与这些形式相关的潜在磨损机制仍然没有得到充分的了解。本研究通过切片实验、磨粒切割深度分析和热-机械耦合有限元模拟相结合的方法，探讨了每种磨损形式对应的机理。结果表明：当切削深度为0.75 μm时，高速刻划硅时，金刚石尖端的闪蒸温度可达825.47 K；正如在切片实验中观察到的那样，这种升高的温度会引起金刚石尖端的氧化，从而导致磨料的快速钝化。接触界面处的相互作用产生了很高的压应力和拉应力。值得注意的是，拉伸应力比压应力更早超过金刚石材料的断裂强度，导致磨粒断裂。此外，磨料从电镀镍基体上的拔出与作用在单个磨料上的力密切相关，这主要取决于它们的切割深度。磨料切割深度的统计分布服从对数正态分布。切削深度超过临界保持强度的磨料容易从钢丝上脱落。从这项工作中获得的见解提供了对磨料磨损行为的更深入了解，并为控制和减轻晶圆切片中的磨损提供了实际意义，从而降低了总体制造成本。

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引用次数: 0

Study of electrochemical characteristics of MnMoS4/CNT hybrid electrodes for energy storage applications 储能用MnMoS4/CNT混合电极的电化学特性研究

IF 5.1 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials

Pub Date : 2026-01-04 DOI: 10.1016/j.diamond.2026.113298

K.M. Arunraja , P. Prasanth , L. Ganesh Babu , R. Girimurugan

The electrochemical performance of supercapacitors is strongly influenced by electrode architecture and structural design. In this work, a MnMoS₄/CNT hybrid electrode was synthesized via a one-step hydrothermal method, in which MnMoS₄ nanosheets were uniformly anchored onto conductive carbon nanotubes (CNTs). The MnMoS₄/CNT composite exhibits a significantly enhanced specific capacitance compared to pristine MnMoS₄, owing to the synergistic contribution of the pseudocapacitive MnMoS₄ and the highly conductive CNT network. The optimized electrode delivers a high specific capacitance of 1516 F/g at 1 A g⁻¹, along with excellent rate capability and superior cycling stability, retaining over 93 % of its initial capacitance after 10,000 charge–discharge cycles. These enhanced electrochemical properties are attributed to the abundant redox-active Mn and Mo sites, rapid electron transport and mechanical robustness provided by CNTs, and a porous hierarchical structure that facilitates efficient ion diffusion. Furthermore, an asymmetric supercapacitor assembled using MnMoS₄/CNT as the positive electrode and activated carbon as the negative electrode achieves a high energy density of 50.83 Wh kg⁻¹ at a power density of 749.9 W kg⁻¹. This study demonstrates that integrating bimetallic sulfides with conductive carbon nanostructures is an effective strategy for developing high-performance and durable energy-storage devices.

超级电容器的电化学性能受到电极结构和结构设计的强烈影响。在这项工作中，通过一步水热法合成了MnMoS4/CNT杂化电极，其中MnMoS4纳米片均匀地固定在导电碳纳米管（CNTs）上。与原始MnMoS4相比，MnMoS4/CNT复合材料表现出显着增强的比电容，这是由于伪电容MnMoS4和高导电性CNT网络的协同作用。优化后的电极在1 a g−1时具有1516 F/g的高比电容，以及出色的倍率能力和卓越的循环稳定性，在10,000次充放电循环后保持超过93%的初始电容。这些增强的电化学性能归功于丰富的氧化还原活性Mn和Mo位点，CNTs提供的快速电子传递和机械鲁棒性，以及促进有效离子扩散的多孔分层结构。此外，以MnMoS4/CNT为正极，活性炭为负极组装的非对称超级电容器在749.9 W kg - 1的功率密度下获得了50.83 Wh kg - 1的高能量密度。该研究表明，将双金属硫化物与导电碳纳米结构相结合是开发高性能、耐用储能器件的有效策略。

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