Diamond and Related Materials最新文献_第7页

Enhanced interfacial bonding and wear resistance in laser melting deposited diamond/FeCoCrNiAl0.5 composites with W-Co/W-Ni coated diamond particles W-Co/W-Ni包覆金刚石颗粒激光熔覆金刚石/FeCoCrNiAl0.5复合材料增强界面结合和耐磨性

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

Diamond and Related Materials

Pub Date : 2026-01-02 DOI: 10.1016/j.diamond.2025.113281

Zhihao Fu , Yongjian Fang , Yingbo Peng , Jiarong Chen , Songhao Hu , Yuan Gao , DePing Chen , Zhenyi Shao , Qingyuan Ma , Yali Zhang , Wei Zhang

Laser melting deposition (LMD) is a robust technique for fabricating complex diamond-reinforced metal matrix composites (MMCs). However, the graphitization of diamond particles and the large mismatch in coefficient of thermal expansion (CTE) degrade interfacial bonding. Here, we presented an interfacial strengthening strategy leveraging the synergistic effects of thermal protection and in-situ matrix strengthening. This was achieved by constructing WNi and WCo dual-layer coatings on diamond particles within a FeCoCrNiAl_0.5 high-entropy alloy (HEA) matrix. The W interlayer ensured bonding by forming WC carbides and acting as a thermal barrier, while the outer Ni/Co layers induced face-centered cubic (FCC) to body-centered cubic (BCC) phase transformation. The Ni layer promoted lamellar BCC phase, whereas the Co layer refined BCC grains into fine granular structures. In the composites with coated diamond, interfacial residual stresses were decreased from ∼1274 MPa to ∼917 MPa for WNi coating and to ∼765 MPa for WCo coating. The coefficient of friction of composites dropped from ∼0.40 to ∼0.28 for WNi coating and to ∼0.19 for WCo coating. Multiscale analysis indicated that both coatings enhanced interfacial bonding by regulating phase transformation and grain morphology, with the WCo coating exhibiting superior interfacial compatibility. First-principles calculations quantitatively confirmed relevant mechanisms. This work provides a theoretical framework for fabricating crack-resistant diamond composites via laser additive manufacturing.

激光熔融沉积（LMD）是一种制备复杂金刚石增强金属基复合材料（MMCs）的强大技术。然而，金刚石颗粒的石墨化和热膨胀系数（CTE）的大失配降低了界面结合。在这里，我们提出了一种利用热保护和原位基体强化协同效应的界面强化策略。这是通过在FeCoCrNiAl0.5高熵合金（HEA）基体内的金刚石颗粒上构建WNi和WCo双层涂层实现的。W层通过形成WC碳化物并起到热障作用来保证键合，而Ni/Co层则诱导面心立方（FCC）向体心立方（BCC）相变。Ni层促进了层状BCC相的形成，而Co层使BCC晶粒细化为细颗粒结构。在包覆金刚石的复合材料中，WNi涂层的界面残余应力从~ 1274 MPa降至~ 917 MPa， WCo涂层降至~ 765 MPa。WNi涂层的摩擦系数从~ 0.40降至~ 0.28，WCo涂层的摩擦系数降至~ 0.19。多尺度分析表明，两种涂层均通过调节相变和晶粒形貌来增强界面结合，其中WCo涂层表现出较好的界面相容性。第一性原理计算定量地证实了相关机制。本研究为激光增材制造抗裂纹金刚石复合材料提供了理论框架。

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引用次数: 0

Bio-sourced Fe-doped carbon dots for dual-mode fluorescence and colorimetric sensing of 4-nitrophenol 生物源fe掺杂碳点用于4-硝基苯酚的双模荧光和比色传感

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

Diamond and Related Materials

Pub Date : 2026-01-01 DOI: 10.1016/j.diamond.2025.113286

Jingwen Zhong , Lini Huo , Haiyi Zhong , Peiyuan Li

The rapid and on-site detection of 4-nitrophenol (4-NP), a refractory and highly toxic environmental pollutant, remains a significant challenge. In this study, iron-doped carbon dots (Fe-CDs) were synthesized via a facile one-pot hydrothermal method using a natural herbal precursor, Citri Reticulatae Pericarpium, as the carbon source. Comprehensive characterization revealed that the Fe-CDs are uniform quasi-spherical nanoparticles with hydrophilic surfaces rich in functional groups such as hydroxyl and carboxyl. This structure endows them with dual functionality: strong intrinsic fluorescence and excellent peroxidase-like activity at neutral pH. Leveraging these properties, we constructed a dual-mode (fluorescence/colorimetric) sensing platform integrated with smartphone-based colorimetric analysis for the rapid, on-site detection of 4-NP. The platform exhibited high sensitivity with a detection limit of 0.17 μM, excellent selectivity against common interferents, and reliable performance in real water samples with satisfactory recovery rates (95.45–107.38 %). Furthermore, the intrinsic Fenton-like activity of the Fe-CDs enabled the oxidative degradation of 4-NP This work presents a sustainable and efficient strategy for environmental monitoring and remediation, highlighting the great potential of herb-derived carbon-based nanozymes in portable sensing applications.

4-硝基苯酚（4-NP）是一种难降解的高毒性环境污染物，其快速、现场检测仍然是一个重大挑战。本研究以天然草药前体柑橘皮为碳源，采用简单的一锅水热法制备了铁掺杂碳点（Fe-CDs）。综合表征表明，Fe-CDs是均匀的准球形纳米颗粒，其亲水表面富含羟基和羧基等官能团。这种结构赋予它们双重功能：在中性ph下具有强的固有荧光和优异的过氧化物酶样活性。利用这些特性，我们构建了一个双模式（荧光/比色）传感平台，结合基于智能手机的比色分析，用于快速，现场检测4-NP。该平台灵敏度高，检出限为0.17 μM，对常见干扰具有良好的选择性，在实际水样中具有可靠的性能，回收率为95.45 ~ 107.38%。此外，Fe-CDs固有的芬顿样活性使4-NP的氧化降解成为可能。这项工作为环境监测和修复提供了一种可持续和有效的策略，突出了草药衍生的碳基纳米酶在便携式传感应用中的巨大潜力。

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引用次数: 0

Preparation of FeNi/CNT nanocomposite electrode for enhanced electrocatalytic degradation of methylene blue 用于增强电催化降解亚甲基蓝的FeNi/CNT纳米复合电极的制备

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

Diamond and Related Materials

Pub Date : 2025-12-31 DOI: 10.1016/j.diamond.2025.113283

Wensheng Li , Zeyang Zhang , Guangzhou Yang , Guangchao Jiang , Facheng Qiu

The escalating discharge of organic wastewater poses severe threats to water resources, necessitating the development of cost-effective and efficient treatment technologies. In this study, FeNi/carbon nanotube (CNT) nanocomposite electrodes with varying Fe/Ni molar ratios (20:0, 15:5, 10:10, 5:15, 0:20) were synthesized via a hydrothermal method for electrocatalytic degradation of methylene blue (MB). The catalyst with the 15:5 Fe/Ni ratio exhibits optimal dispersion and crystallinity. Electrochemical analyses via cyclic voltammetry (CV) revealed a prominent MB oxidation peak at +0.6 V (vs. Ag/AgCl), attributed to hydroxyl radical generation. Under optimized conditions (current density: 75 mA/cm², electrolyte concentration: 0.1 M NaCl, pH 7), the Fe/Ni 15:5 electrode achieved 94.92 % MB degradation within 10 min, outperforming single-metal counterparts. Kinetic studies indicated pseudo-first-order degradation behavior with a rate constant of 0.283 min⁻¹. The synergistic effect between Fe/Ni bimetal active sites and CNT's conductive network was identified as the key factor enhancing charge transfer and catalytic efficiency. This work provides a scalable strategy for designing non-precious metal electrocatalysts for organic wastewater treatment.

有机废水排放的不断增加对水资源造成了严重的威胁，需要开发成本效益高、效率高的处理技术。采用水热法制备了不同Fe/Ni摩尔比（20:0,15:5,10:10,5:15,0:20）的FeNi/ CNT纳米复合电极，用于电催化降解亚甲基蓝（MB）。Fe/Ni比为15:5的催化剂具有最佳的分散性和结晶度。通过循环伏安法（CV）的电化学分析发现，在+0.6 V（相对于Ag/AgCl）时，MB氧化峰明显，这是由于羟基自由基的产生。在优化条件下（电流密度为75 mA/cm2，电解质浓度为0.1 M NaCl， pH为7），Fe/Ni 15:5电极在10 min内对MB的降解率为94.92%，优于单金属电极。动力学研究表明，伪一级降解行为的速率常数为0.283 min−1。Fe/Ni双金属活性位点与碳纳米管导电网络之间的协同效应是提高电荷转移和催化效率的关键因素。这项工作为设计用于有机废水处理的非贵金属电催化剂提供了一种可扩展的策略。

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引用次数: 0

Dual-layer PEO/DLC coatings for biodegradable magnesium stents; improving corrosion resistance, cell adhesion and blood compatibility 生物可降解镁支架用双层PEO/DLC涂层提高抗腐蚀、细胞粘附和血液相容性

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

Diamond and Related Materials

Pub Date : 2025-12-31 DOI: 10.1016/j.diamond.2025.113282

Hoda Asadipour, Fakhreddin Ashrafizadeh, Nasir Shahin

This study investigates corrosion resistance, blood compatibility and biological behavior of dual-layer PEO/DLC coatings deposited on biodegradable AZ31 magnesium alloy, as well as the effect of coating thickness on these attributes for cardiovascular stent applications. Accordingly, DLC thin films with nominal thicknesses ranging from 250 nm to 1 μm were formed on substrates using radio frequency plasma-enhanced chemical vapor deposition (RFPECVD) following the surface modification by plasma electrolytic oxidation process. The samples were evaluated using electrochemical and immersion tests in SBF, as well as hemocompatibility and cell behavior testing. The findings revealed that the PEO/DLC bilayer coatings considerably improved the corrosion resistance, biocompatibility, and hemocompatibility of the AZ31 alloy. This coating reduced the degradation rate and controlled pH and Mg⁺ ion release. Increasing the thickness of the DLC coating enhanced endothelial cell viability and proliferation, however, an excessive increase in DLC thickness would reduce the beneficial effects of hemocompatibility. Overall, the findings of this study indicate that duplex treatment, with appropriate thickness design of DLC, is a promising choice for the development of bioabsorbable stents.

本研究研究了可生物降解的AZ31镁合金上沉积的双层PEO/DLC涂层的耐腐蚀性、血液相容性和生物学行为，以及涂层厚度对心血管支架应用中这些属性的影响。采用射频等离子体增强化学气相沉积（RFPECVD）技术，通过等离子体电解氧化工艺对衬底进行表面改性，在衬底上形成了标称厚度为250 nm ~ 1 μm的DLC薄膜。使用电化学和SBF浸泡试验，以及血液相容性和细胞行为试验对样品进行评估。结果表明，PEO/DLC双层涂层显著提高了AZ31合金的耐腐蚀性、生物相容性和血液相容性。该涂层降低了降解速率，控制了pH和Mg+离子的释放。增加DLC涂层的厚度可以增强内皮细胞的活力和增殖，但过度增加DLC厚度会降低血液相容性的有益作用。综上所述，本研究结果表明，采用适当厚度的DLC设计的双重处理是开发生物可吸收支架的一个有希望的选择。

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引用次数: 0

In-situ hydrothermal preparation of amorphous carbon-supported surface-fluorinated reduced TiO2-x: Effect of linear carbon source structures on their adsorption and photocatalytic performance 原位水热法制备无定形碳负载表面氟化还原性TiO2-x：线性碳源结构对其吸附和光催化性能的影响

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

Diamond and Related Materials

Pub Date : 2025-12-31 DOI: 10.1016/j.diamond.2025.113285

Zhaoying Wang, Shilong Yu, Ting Wang, Chunli Wang, Xuepeng Yin, Hao Niu, Shanmin Gao

Considerable research has been devoted to photocatalyst design; however, achieving simultaneous enhancement of visible-light responsiveness and adsorption ability remains a significant challenge. In this work, amorphous carbon-supported, surface-fluorinated TiO_2-x was synthesized via an in-situ hydrothermal process in the presence of trace hydrofluoric acid, using four linear polyhydroxy compounds (glucose, fructose, citric acid, and sorbitol) as carbon precursors. The resulting products were systematically characterized, and their adsorption and photocatalytic performances were compared. The results reveal that the molecular structure of the carbon source strongly influences crystallinity, carbon content, and Ti³⁺/Ov concentration, thereby governing photocatalytic efficiency. Specifically, citric acid-derived TiO_2-x exhibited enhanced surface fluorination and higher Ti³⁺/Ov content, leading to superior degradation activity, while sorbitol-derived samples showed poor crystallinity and higher amorphous carbon content, resulting in the weakest performance. Glucose- and fructose-derived products displayed intermediate behaviors. Furthermore, zeta potential and electrochemical analyses elucidated the mechanisms underlying these variations. Overall, this study demonstrates a strategy to tailor photocatalytic materials by selecting appropriate carbon precursors, offering insights for the rational design of TiO₂-based catalysts for environmental remediation applications.

人们对光催化剂的设计进行了大量的研究；然而，如何同时提高可见光响应性和吸附能力仍然是一个重大挑战。在这项工作中，以四种线性多羟基化合物（葡萄糖、果糖、柠檬酸和山梨醇）为碳前体，在微量氢氟酸存在下，通过原位水热法合成了无定形碳负载的表面氟化TiO2-x。对产物进行了系统表征，并对其吸附和光催化性能进行了比较。结果表明，碳源的分子结构强烈影响结晶度、碳含量和Ti3+/Ov浓度，从而控制光催化效率。具体来说，柠檬酸衍生的TiO2-x表现出增强的表面氟化和更高的Ti3+/Ov含量，从而导致更好的降解活性，而山梨醇衍生的样品表现出较差的结晶度和较高的无定形碳含量，导致性能最差。葡萄糖和果糖衍生产物表现出中间行为。此外，zeta电位和电化学分析阐明了这些变化的机制。总体而言，本研究展示了通过选择合适的碳前体来定制光催化材料的策略，为合理设计用于环境修复应用的tio2基催化剂提供了见解。

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引用次数: 0

Dual modulation of the Schottky barrier in a graphene/Janus WSSiN2 heterostructure: Interlayer spacing and external electric field 石墨烯/Janus WSSiN2异质结构中肖特基势垒的双调制：层间间距和外电场

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

Diamond and Related Materials

Pub Date : 2025-12-30 DOI: 10.1016/j.diamond.2025.113273

Libo Wang , Xinguo Ma , Jiaqi Wang , Biao Ma , Guanyan Xiao , Jingjing Lu , Jeongmin Hong

Overcoming interfacial barriers and optimizing charge transport in heterostructure field-effect transistors (FETs) represent significant and challenging research frontiers. In this work, first-principles calculations served as the tool to systematically examine the modulation mechanisms of the Schottky barrier in graphene/Janus WSSiN₂ heterostructures, with interlayer spacing variation and external electric fields as the regulating factors. Leveraging the unique vertical structural asymmetry of WSSiN₂, we constructed two distinct configurations: graphene/N₂WSSi and graphene/SWSiN₂. The tunability of the Schottky barrier height (SBH) in these heterostructures is demonstrated by our calculations results to be achievable through both interlayer spacing and external electric fields. However, the transition of Schottky contact types can only be induced by applying an external electric field. Specifically, under the action of different electric fields, both types of heterostructures can achieve a controllable p-type/n-type conversion in Schottky behavior, eventually forming an ohmic contact. Under applied electric fields, the maximum carrier concentrations in graphene reach 2.95 × 10¹³ cm⁻² (at −0.58 V·Å⁻¹) in the graphene/N₂WSSi system and 2.52 × 10¹³ cm⁻² (at +0.58 V·Å⁻¹) in the graphene/SWSiN₂ system. These findings underscore the promising potential of graphene/WSSiN₂ heterostructures for application in next-generation high-performance Schottky transistors.

克服界面障碍和优化电荷输运是异质场效应晶体管（fet）中具有重要意义和挑战性的研究前沿。在这项工作中，第一性原理计算作为工具，系统地研究了石墨烯/Janus WSSiN2异质结构中肖特基势垒的调制机制，层间间距变化和外电场是调节因素。利用WSSiN2独特的垂直不对称结构，我们构建了两种不同的构型：石墨烯/N2WSSi和石墨烯/SWSiN2。计算结果表明，这些异质结构中的肖特基势垒高度（SBH）可通过层间间距和外加电场实现。然而，肖特基接触类型的转变只能通过施加外电场来诱导。具体而言，在不同电场的作用下，两种异质结构均可实现可控的p型/n型肖特基行为转换，最终形成欧姆接触。在外加电场作用下，石墨烯/N2WSSi体系中载流子浓度最大达到2.95 × 1013 cm−2(−0.58 V·Å−1)，石墨烯/SWSiN2体系中载流子浓度最大达到2.52 × 1013 cm−2 （+0.58 V·Å−1）。这些发现强调了石墨烯/WSSiN2异质结构在下一代高性能肖特基晶体管中的应用潜力。

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引用次数: 0

Mechanism of transition metal atoms etching the diamond (111) surface: From physisorption to graphitization 过渡金属原子腐蚀金刚石（111）表面的机理：从物理吸附到石墨化

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

Diamond and Related Materials

Pub Date : 2025-12-30 DOI: 10.1016/j.diamond.2025.113271

Jie Zhao , Chenwei Dai , Qing Miao , Zhen Yin , Ming Zhang , Jiajia Chen

Polishing diamond with transition metal can significantly improve the processing efficiency and surface quality, but the lack of in-depth analysis from micro aspect limits the application and promotion of diamond. Different from the conventional approach of determining metal atom adsorption sites by calculating adsorption energy, this study employs a multi-scale simulation method combining first-principles calculations and classical molecular dynamics, integrated with the Monte Carlo annealing algorithm, to systematically investigate the adsorption configurations, adsorption behaviors, and etching mechanisms of six transition metal atoms (Fe, Co, Cu, Ni, Ti, Cr) on the diamond (111) surface. The results show that the six transition metal atoms are first spontaneously physically adsorbed to the hollow site directly above the six-membered carbon ring under the synergistic effects of van der Waals forces and electrostatic forces, which is followed by chemical adsorption. The chemisorption energy for the six atoms on the diamond (111) surface is −7.23 eV (Ti), −6.21 eV (Cr), −3.92 eV (Fe), −3.76 eV (Co), −3.65 eV (Ni) and −2.47 eV (Cu). During this process, the atoms undergo electron transfer with surrounding carbon atoms and form stable new chemical bonds, resulting in a significant decrease in the bond strength and breakage energy barrier of some interlayer CC bonds in the first bilayer-structure, which are further weakened by high temperature until the interlayer CC bonds are completely cleaved. Carbon atoms and carbon clusters in the free-state will be generated during continuous etching, and finally graphitization occurs. The findings would further elucidate the interface reaction mechanism between diamond and transition metals, which has important guiding significance for realizing high-quality and high-efficient machining of diamond materials.

用过渡金属对金刚石进行抛光处理，可以显著提高加工效率和表面质量，但缺乏从微观层面的深入分析，限制了金刚石的应用和推广。与传统通过计算吸附能确定金属原子吸附位置的方法不同，本研究采用第一性原理计算与经典分子动力学相结合的多尺度模拟方法，结合蒙特卡罗退火算法，系统研究了六种过渡金属原子（Fe, Co, Cu, Ni, Ti, Cr）在金刚石（111）表面的吸附构型、吸附行为和刻蚀机理。结果表明：在范德华力和静电力的协同作用下，6个过渡金属原子首先自发地物理吸附到六元碳环正上方的空心位置，然后进行化学吸附；6个原子在金刚石（111）表面的化学吸附能分别为−7.23 eV （Ti）、−6.21 eV （Cr）、−3.92 eV （Fe）、−3.76 eV （Co）、−3.65 eV （Ni）和−2.47 eV （Cu）。在此过程中，原子与周围碳原子发生电子转移，形成稳定的新化学键，导致第一层双层结构中部分层间CC键的键强度和断裂能垒显著降低，并在高温作用下进一步减弱，直至层间CC键完全断裂。在连续蚀刻过程中，会产生自由态的碳原子和碳团簇，最终发生石墨化。研究结果将进一步阐明金刚石与过渡金属之间的界面反应机理，对实现金刚石材料的高质量、高效率加工具有重要的指导意义。

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引用次数: 0

Cathodoluminescence of n-type diamond films grown by hot-filament chemical vapor deposition: Effects of hydrogen concentration 热丝化学气相沉积n型金刚石薄膜阴极发光：氢浓度的影响

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

Diamond and Related Materials

Pub Date : 2025-12-29 DOI: 10.1016/j.diamond.2025.113264

Yūki Katamune , Satoshi Inoshita , Akira Izumi , Kenji Watanabe , Tokuyuki Teraji , Satoshi Koizumi

n-Type diamond semiconductors can be fabricated by phosphorus doping via chemical vapor deposition (CVD), which is a crucial process for advancing diamond-based electronic and quantum technologies. Among various CVD techniques, hot-filament CVD is a promising method for producing n-type diamond, particularly for heavy doping, due to its simplicity and scalability. To effectively utilize this method, a comprehensive understanding of the resulting crystal quality and impurity behavior is required. In this study, we performed the epitaxial growth of n-type diamond films with phosphorus concentrations on the order of 10¹⁸ cm⁻³ by hot-filament CVD and characterized their crystal quality and phosphorus donor states through cathodoluminescence (CL) analysis. Hall effect measurements confirmed n-type conductivity of the films regardless of hydrogen concentrations (~10¹⁸ and ~10¹⁹ cm⁻³). CL analysis revealed that the films exhibited luminescence from excitons bound to phosphorus donors in the near-band-edge region, indicating the formation of high-quality n-type diamond. Notably, the film with high hydrogen concentrations (~10¹⁹ cm⁻³) exhibited a spectral shift of exciton peaks toward lower photon energies along with the disappearance of fine structures, and the emergence of band-A emission in the visible-light region. These findings suggest that a large number of hydrogen atoms are associated with crystal defects and do not fully inactivate phosphorus donors.

磷掺杂化学气相沉积（CVD）技术可以制备n型金刚石半导体，这是推进基于金刚石的电子和量子技术的关键工艺。在各种化学气相沉积技术中，热丝化学气相沉积因其简单和可扩展性而成为制备n型金刚石，特别是重掺杂金刚石的一种很有前途的方法。为了有效地利用这种方法，需要对所得晶体质量和杂质行为有全面的了解。在本研究中，我们采用热丝CVD法对磷浓度为1018 cm−3的n型金刚石薄膜进行了外延生长，并通过阴极发光（CL）分析表征了其晶体质量和磷供体态。霍尔效应测量证实，无论氢浓度（~1018和~1019 cm−3）如何，薄膜都具有n型电导率。CL分析表明，薄膜在近带边缘区域显示出与磷供体结合的激子发光，表明形成了高质量的n型金刚石。值得注意的是，在高氢浓度（~1019 cm−3）的薄膜中，随着精细结构的消失，激子峰的光谱向较低光子能量方向移动，并且在可见光区出现了带a发射。这些发现表明，大量的氢原子与晶体缺陷有关，并不能完全灭活磷供体。

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引用次数: 0

Ultra-safe synthesis of Mo2CTx MXene as anode for lithium-ion battery 锂离子电池负极Mo2CTx MXene的超安全合成

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

Diamond and Related Materials

Pub Date : 2025-12-29 DOI: 10.1016/j.diamond.2025.113276

Yitong Guo , Chenxiao Wang , Xianju Shi , Yanhuan Chen , Lifang Wang , Yanan Liu , Yuqian Wang , Xiaoning Wang , Yukai Chang , Aiguo Zhou

In this paper, a green and efficient low-concentration ammonium fluoride etching strategy is developed for the synthesis of two-dimensional highly pure Mo₂CT_x MXene. Using the Mo₂Ga₂C MAX phase as the precursor, highly pure Mo₂CT_x MXene was prepared via hydrothermal etching with a 1 M NH₄F aqueous solution at 160 °C for 12 h. By employing a slow-release fluorine source mechanism, the NH₄F concentration was maintained at 1 M, significantly reducing toxicity risks and improving operational safety while providing a safe pathway for large-scale MXene production. The structural characterization of the material revealed that the as-prepared Mo₂CT_x MXene exhibits a typical two-dimensional layered structure, with microscopic morphology and crystal parameters consistent with those obtained by conventional etching methods. As an anode material for lithium-ion batteries, the Mo₂CT_x MXene delivered an initial discharge specific capacity of 873.5 mAh g⁻¹ at a current density of 0.05 A g⁻¹, and retained 33.7 mAh g⁻¹ after 100th cycles of high-rate cycling at 0.5 A g⁻¹. This represents the first application of a low-concentration NH₄F etching system for preparing Mo₂CT_x MXene. The findings of this study not only enhance the safety of MXene synthesis but also provide new research directions for the development of green synthesis processes for Mo₂CT_x MXene.

本文提出了一种绿色高效的低浓度氟化铵蚀刻工艺，用于合成二维高纯Mo2CTx MXene。以Mo2Ga2C MAX相为前驱体，用1 M NH4F水溶液在160℃下水热刻蚀法制备了高纯Mo2CTx MXene。采用氟源缓释机制，将NH4F浓度维持在1 M，显著降低了毒性风险，提高了操作安全性，同时为大规模生产MXene提供了安全途径。材料的结构表征表明，制备的Mo2CTx MXene具有典型的二维层状结构，微观形貌和晶体参数与传统刻蚀方法一致。作为锂离子电池的负极材料，Mo2CTx MXene在0.05 a g−1电流密度下的初始放电比容量为873.5 mAh g−1，在0.5 a g−1高倍率循环100次后仍保持33.7 mAh g−1。这代表了低浓度NH4F蚀刻系统在制备Mo2CTx MXene中的首次应用。本研究结果不仅提高了MXene合成的安全性，而且为Mo2CTx MXene绿色合成工艺的发展提供了新的研究方向。

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引用次数: 0

Y(III) extraction from synthesized solution using a novel, eco-friendly, reusable, super-nanoadsorbent 利用一种新型、环保、可重复使用的超纳米吸附剂从合成溶液中提取Y（III）

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

Diamond and Related Materials

Pub Date : 2025-12-29 DOI: 10.1016/j.diamond.2025.113272

Mahdi Gharabaghi , Abolfazl Ahadi , Hadi Abdollahi , Ali Altaee , Amir Keshtgar , Mahmod Tamadoni Saray , Masoud Zahiri , Adel Taheri , Mostafa Chegini

This paper presents the synthesis and application of novel functionalized graphene oxide nanostructures (CGD) for extraction and environmental applications. The CGD adsorbent was synthesized by deposition of graphene oxide (GO) onto a carbon fabric and modifying the GO surface with D2EHPA. Comprehensive characterization techniques, such as FE-SEM, XRD, Raman spectroscopy, and FT-IR, were employed to analyze the CGD adsorbent. Under optimum conditions (pH 6, 25 °C, 100 mg L⁻¹ initial Y(III) concentration, 1 cm² CGD dose, 155 rpm agitation, and 120 min contact time), the nanoadsorbent exhibited a maximum Y(III) adsorption capacity of 666.7 mg g⁻¹, fitting the Langmuir isotherm model (R² ≈ 0.99; χ² = 2.17). Kinetic data were best described by the pseudo-second-order model (R² ≈ 0.99; χ² = 1.03), indicating chemisorption-driven uptake. Thermodynamic analysis (ΔH = +9.23 kJ mol⁻¹, ΔS = +0.04 kJ mol⁻¹ K⁻¹, and negative ΔG values across all tested temperatures) confirmed that adsorption was endothermic, spontaneous, and accompanied by increased interfacial disorder. The CGD material retained 73.4 % of its adsorption capacity after four adsorption–desorption cycles, demonstrating its potential for sustainable Y(III) extraction and wastewater purification.

本文介绍了新型功能化氧化石墨烯纳米结构（CGD）的合成及其在萃取和环境方面的应用。将氧化石墨烯（GO）沉积在碳织物上，并用D2EHPA对其表面进行改性，制备了CGD吸附剂。采用FE-SEM、XRD、拉曼光谱、FT-IR等综合表征技术对CGD吸附剂进行了分析。在最佳条件下（pH 6, 25°C，初始Y（III）浓度100 mg L−1，CGD剂量1 cm2，搅拌155 rpm，接触时间120 min），纳米吸附剂对Y（III）的最大吸附量为666.7 mg g−1，符合Langmuir等温模型（R2≈0.99;χ2 = 2.17）。动力学数据用拟二阶模型（R2≈0.99;χ2 = 1.03）描述最好，表明化学吸收驱动摄取。热力学分析（ΔH = +9.23 kJ mol−1，ΔS = +0.04 kJ mol−1 K−1，在所有测试温度下均为负ΔG值）证实吸附是吸热的、自发的，并且伴随着界面紊乱的增加。经过4次吸附-解吸循环后，CGD材料仍保持了73.4%的吸附量，表明其具有可持续Y（III）提取和废水净化的潜力。

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