Materials Today Nano最新文献_第2页

Solid-state Tri-nano Spheres: An adsorbate for coupling reactions and pharma-waste treatment 固态三纳米微球：偶联反应和制药废物处理的吸附物

IF 8.2 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today Nano

Pub Date : 2025-12-26 DOI: 10.1016/j.mtnano.2025.100747

Ramya Ravichandran, Sundaravadivel Elumalai

In trend, water purification and energy demands are the major global crises impacting the world today. To address these challenges, many researchers are developing new materials; as a result the potential of nanocomposites has captured the attention of scientists. In this study, we take a step forward by developing a green synthesis approach for producing a trimetallic nano-core shell composite (TMNC) through an environmentally friendly method, a solid-state manual grinding technique, which eliminates the need for toxic solvents in the synthesis process. CAD/OP anchors the nanoparticles (NPs) formation and for the reduction of the metallic ions. The as-crafted TMNC had been characterized via several analytical instruments such as, XRD, UV–vis, HR-TEM, FE-SEM, VSM, XPS and NMR analysis. The large number of available vacant sites in the TMNC, it can adsorb the molecules on the surface helps in forming the C-C bond making reactions. In addition, this also helpful in the photo-degradation of pharma-wastes as Doxycycline (DY), Paracetamol (PT) hikes up to 91 % and 88 % correspondingly. Using sodium borohydride (NaBH₄) as a hydrogen source, the synthesized TMNC is efficient in the reduction of 4-nitrophenol. This catalyst could be readily scaled up to produce gram-scale material which was prepared with energy-efficient method. Overall, the as-crafted TMNC flagged a promising material for versatile applications and it provokes a way for the advancement in the heterogenous catalysis and other organic conversion reactions.

从趋势上看，水净化和能源需求是影响当今世界的主要全球危机。为了应对这些挑战，许多研究人员正在开发新材料；因此，纳米复合材料的潜力引起了科学家们的注意。在这项研究中，我们向前迈进了一步，通过一种环境友好的方法，即固态手工研磨技术，开发了一种绿色合成方法来生产三金属纳米核壳复合材料（TMNC），从而消除了合成过程中对有毒溶剂的需求。CAD/OP锚定纳米颗粒（NPs）的形成和金属离子的还原。通过XRD、UV-vis、HR-TEM、FE-SEM、VSM、XPS和NMR等分析仪器对制备的TMNC进行了表征。TMNC中有大量可用的空位，它可以吸附表面的分子，有助于形成C-C键的制键反应。此外，这也有助于制药废弃物的光降解，多西环素（DY）和对乙酰氨基酚（PT）的光降解率分别高达91%和88%。以硼氢化钠（NaBH4）为氢源，合成的TMNC对4-硝基苯酚有较好的还原效果。该催化剂可以很容易地放大生产克级材料，并采用节能方法制备。总的来说，精心制作的TMNC标志着一种有前途的材料，具有广泛的应用前景，它为多相催化和其他有机转化反应的进步开辟了一条道路。

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引用次数: 0

Bio-organic collagen–graphene nanofiber synaptic device emulating neuroplasticity and spike-timing-dependent plasticity 模拟神经可塑性和峰值时间依赖性可塑性的生物有机胶原-石墨烯纳米纤维突触装置

IF 8.2 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today Nano

Pub Date : 2025-12-25 DOI: 10.1016/j.mtnano.2025.100746

Shivtej M. Mane , Amit A. Bagade , Kasturi A. Rokade , Sumedh S. Mahajan , Pooja D. Halagale , Sharmili A. Surve , Pooja P. Sonawane , Kiran A. Nirmal , A. Anto Jeffery , Young-Ho Ahn , Tae Geun Kim , Tukaram D. Dongale

Collagen is a biocompatible and biodegradable biopolymer with potential applications in bioelectronics; however, its poor electrical conductivity limits its use in electronic devices. To overcome this, we have composited the collagen with highly conducting 2D graphene and synthesized one-dimensional (1D) collagen-graphene nanofibers (Col-Gr NFs) by the electrospinning technique. These 1D NFs were utilized to emulate comprehensive neuroplasticity for neuromorphic computing applications, owing to their structural and functional similarities to biological neurons and synapses. The Ag/Col-Gr NFs/FTO device shows good bipolar resistive switching within ±1 V. Moreover, the Ag/Col-Gr NFs/FTO device shows excellent cycle stability (15,000 cycles) and memory retention (30,000 s) by switching between two memory states. The charge-flux analysis confirmed the device’s non-ideal memristive behaviour. The switching variability was assessed using different statistical techniques. The device emulates key synaptic behaviours, including potentiation, depression, excitatory and inhibitory post-synaptic currents (EPSC/IPSC), paired-pulse facilitation and depression (PPF/PPD), and two types of spike-timing-dependent plasticity (STDP) rules. Importantly, the Ag/Col-Gr NFs/FTO device exhibited complete degradation in aqueous conditions, confirming its physically transient nature. This work demonstrates the promising potential of Col-Gr composite NFs as a novel material for sustainable artificial synaptic devices.

胶原蛋白是一种具有生物相容性和可生物降解的生物聚合物，在生物电子学方面具有潜在的应用前景；然而，其导电性差限制了其在电子设备中的应用。为了克服这一问题，我们将胶原蛋白与高导电性的二维石墨烯复合，并通过静电纺丝技术合成了一维（1D）胶原-石墨烯纳米纤维（Col-Gr NFs）。由于其结构和功能与生物神经元和突触相似，这些1D NFs被用来模拟神经形态计算应用的综合神经可塑性。Ag/Col-Gr NFs/FTO器件在±1v内具有良好的双极电阻开关性能。此外，Ag/Col-Gr NFs/FTO器件通过在两种记忆状态之间切换，表现出优异的周期稳定性（15,000个周期）和记忆保留（30,000 s）。电荷通量分析证实了器件的非理想忆阻特性。使用不同的统计技术评估开关变异性。该装置模拟关键的突触行为，包括增强、抑制、兴奋性和抑制性突触后电流（EPSC/IPSC）、成对脉冲促进和抑制（PPF/PPD），以及两种类型的峰值时间依赖的可塑性（STDP）规则。重要的是，Ag/Col-Gr NFs/FTO器件在水条件下表现出完全降解，证实了其物理瞬态性质。这项工作证明了colr - gr复合材料NFs作为可持续人工突触器件的新材料的巨大潜力。

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引用次数: 0

Multifunctional nanotherapeutic platform: Metformin potentiates Ce6/GOX-based targeted synergistic therapy for colorectal cancer 多功能纳米治疗平台：二甲双胍增强基于Ce6/ gox的结直肠癌靶向协同治疗

IF 8.2 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today Nano

Pub Date : 2025-12-22 DOI: 10.1016/j.mtnano.2025.100743

Xinyu Mao , Shiwei Liu , Xinhao Li , Menghui Zhang , Peng Shen , Yaning Zhu , Xiaozhong Yang

Colorectal cancer (CRC) is the third most prevalent malignancy globally. Its tumor microenvironment (TME) heterogeneity and chemotherapy resistance compromise the efficacy of conventional treatments such as surgery and chemotherapy. This study developed a multifunctional nanotherapeutic platform by synthesizing mesoporous silica nanoparticles (MSNs) via a modified Stöber method. The carboxylated MSN surface was sequentially loaded with metformin (Me), chlorin e6 (Ce6), and glucose oxidase (GO_X), constructing an Me/Ce6@MSN-GO_X (MCMG) nanosystem. The synthesized MSNs demonstrated excellent porosity, pore volume, and high loading capacity. In vitro and in vivo studies showed that MCMG reversed the Warburg effect via the AMPK/ACC/mTOR axis, reprogrammed tumor energy metabolism, and enhanced GO_X-induced starvation therapy and Ce6-based photodynamic therapy (PDT). MCMG also alleviated TME hypoxia by suppressing HIF-1α expression, inducing an approximately 2-fold increase in intracellular reactive oxygen species levels and culminating in a 71 % tumor inhibition rate in vivo. This platform integrated Me's metabolic regulation with Ce6-mediated PDT and GO_X-driven starvation therapy to achieve synergistic CRC eradication. MCMG enables multifunctional theranostics through synergistic mechanisms (metabolic modulation, oxidative damage, and nutrient deprivation) coupled with fluorescence imaging capabilities, presenting a novel strategy for CRC treatment.

结直肠癌（CRC）是全球第三大恶性肿瘤。其肿瘤微环境（TME）异质性和化疗耐药性影响了手术和化疗等常规治疗的疗效。本研究通过改进Stöber方法合成介孔二氧化硅纳米颗粒（MSNs），开发了多功能纳米治疗平台。在羧化的MSN表面依次负载二甲双胍（Me）、氯代e6 （Ce6）和葡萄糖氧化酶（GOX），构建了Me/Ce6@MSN-GOX （MCMG）纳米体系。合成的msn具有优异的孔隙率、孔隙体积和高负载能力。体外和体内研究表明，MCMG通过AMPK/ACC/mTOR轴逆转Warburg效应，重新编程肿瘤能量代谢，增强gox诱导的饥饿治疗和基于ce6的光动力治疗（PDT）。MCMG还通过抑制HIF-1α表达来缓解TME缺氧，诱导细胞内活性氧水平增加约2倍，最终在体内达到71%的肿瘤抑制率。该平台将Me的代谢调节与ce6介导的PDT和gox驱动的饥饿治疗相结合，以实现协同根除CRC。MCMG通过协同机制（代谢调节、氧化损伤和营养剥夺）与荧光成像能力相结合，实现多功能治疗，为结直肠癌治疗提供了一种新的策略。

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引用次数: 0

Thermal properties of bilayer graphene influenced by interlayer coupling 层间耦合对双层石墨烯热性能的影响

IF 8.2 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today Nano

Pub Date : 2025-12-22 DOI: 10.1016/j.mtnano.2025.100744

Jiayuan Fang , Yang Zhang , Qiancheng Ren , Pei Zhao

How the interfacial thermal conduction of bilayer graphene (BLG) is affected by the interlayer coupling strength has not been fully elucidated yet. This study explores the influence of interlayer coupling on the in-plane and interfacial thermal properties of BLG. Four types of isotope-labeled BLG samples—transferred, annealed, twist, and AB-stacked—are fabricated, and Raman spectroscopy and non-equilibrium molecular dynamics (NEMD) simulations are employed to investigate their thermal conductivities. The results show that as the interlayer coupling strength increases, the interfacial thermal conductance (G) of BLG gradually rises as well. Compared with transferred BLG, an annealing operation leads to a 74.2 % increase in G values, and twist BLG and AB-BLG show approximately four and five times increases, respectively. In contrast, the in-plane thermal conductivity (K) changes nonlinearly. NEMD simulations further reveal that stronger interlayer coupling leads to a greater reduction in K while linearly enhancing G. The vibrational density of state analysis indicates that interlayer coupling increases phonon scattering in the in-plane direction and promotes the contribution of low-frequency phonons to thermal conduction across the interface. These findings deepen the understanding of graphene's thermal properties and offer valuable guidance for optimizing the thermal management applications of 2D materials.

双层石墨烯（BLG）的界面热传导如何受层间耦合强度的影响还没有完全阐明。本研究探讨了层间耦合对BLG面内和界面热性能的影响。制备了四种类型的同位素标记的BLG样品——转移、退火、扭曲和ab堆叠，并利用拉曼光谱和非平衡分子动力学（NEMD）模拟研究了它们的热导率。结果表明：随着层间耦合强度的增大，复合材料的界面热导率(G)也逐渐增大；与转移BLG相比，退火处理使G值增加了74.2%，扭转BLG和AB-BLG分别增加了约4倍和5倍。而面内导热系数(K)则呈非线性变化。NEMD模拟进一步表明，层间耦合强度越强，K值降低幅度越大，g值线性增加。态的振动密度分析表明，层间耦合增加了声子在面内方向的散射，促进了低频声子对界面热传导的贡献。这些发现加深了对石墨烯热性能的理解，并为优化二维材料的热管理应用提供了有价值的指导。

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引用次数: 0

Synergistic nanobubble-mediated sonodynamic therapy and MicroRNA immunotherapy suppresses hepatocellular carcinoma 协同纳米气泡介导的声动力疗法和MicroRNA免疫疗法抑制肝细胞癌

IF 8.2 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today Nano

Pub Date : 2025-12-19 DOI: 10.1016/j.mtnano.2025.100742

Yao Ma , Chenlu Xiao , Jiaxuan Han , XiangMin Zhang , Xiaoya He , Jie Huang , Huiru Zhu , Chaoqi Liu , Yun Zhao , JinHua Cai

The immunosuppressive tumor microenvironment critically influences hepatocellular carcinoma (HCC) progression. To counteract this, we developed cationic lipid nanobubbles (NBs) co-loaded with the sonosensitizer curcumin (CUR) and tumor-suppressive microRNA miR-15a-5p. This nanoplatform enables ultrasound-targeted delivery and real-time contrast-enhanced imaging. Upon ultrasound irradiation, CUR generated cytotoxic reactive oxygen species (ROS; 46.87 % ± 5.34 % ROS-positive cells vs. 1.26 % ± 0.99 % controls), inducing immunogenic cell death (ICD). Concurrently, miR-15a-5p directly targeted CD274 mRNA, suppressing PD-L1 protein expression on tumor cells. In tumor-bearing mice, the combined therapy (miR-15a-5p/CUR-NBs + US) significantly outperformed monotherapies, suppressing tumor growth and promoting apoptosis. This was accompanied by enhanced immune activation: increased cytotoxic T lymphocytes (CTLs) infiltration (10.90 % ± 0.61 % vs. 3.88 % ± 0.08 % in controls) with elevated target cell killing (32.27 % ± 2.95 % vs. 8.88 % ± 2.43 % in controls), and augmented natural killer (NK) cells cytotoxicity (57.34 % ± 6.43 %). The platform also potently remodeled the immunosuppressive tumor milieu by driving a phenotypic shift in tumor-associated macrophages (TAMs) from the M2 to the M1 pole and by effectively reducing myeloid-derived suppressor cells (MDSCs). Critically, the strategy demonstrated favorable biosafety, with no significant weight loss or organ toxicity observed. This theranostic platform effectively overcomes HCC immunosuppression by synergistically integrating sonodynamic therapy with miRNA-mediated immune reprogramming, offering a promising approach for advanced HCC.

免疫抑制肿瘤微环境严重影响肝细胞癌（HCC）的进展。为了解决这个问题，我们开发了阳离子脂质纳米泡（NBs），共负载了声敏剂姜黄素（CUR）和肿瘤抑制microRNA miR-15a-5p。这种纳米平台可以实现超声靶向递送和实时对比度增强成像。超声照射后，CUR产生细胞毒性活性氧（ROS， ROS阳性细胞46.87%±5.34%，对照组1.26%±0.99%），诱导免疫原性细胞死亡（ICD）。同时，miR-15a-5p直接靶向CD274 mRNA，抑制肿瘤细胞上PD-L1蛋白的表达。在荷瘤小鼠中，联合治疗（miR-15a-5p/ cur - nb + US）显著优于单一治疗，抑制肿瘤生长并促进细胞凋亡。这伴随着增强的免疫激活：细胞毒性T淋巴细胞（ctl）浸润增加（对照组为10.90%±0.61%，对照组为3.88%±0.08%），靶细胞杀伤增加（对照组为32.27%±2.95%，对照组为8.88%±2.43%），自然杀伤（NK）细胞毒性增强（57.34%±6.43%）。该平台还通过驱动肿瘤相关巨噬细胞（tam）从M2极向M1极的表型转变，并通过有效减少髓源性抑制细胞（MDSCs），有效地重塑了免疫抑制肿瘤环境。关键是，该策略显示出良好的生物安全性，没有观察到明显的体重减轻或器官毒性。该治疗平台通过将声动力治疗与mirna介导的免疫重编程协同结合，有效克服了HCC的免疫抑制，为晚期HCC提供了一种有前景的治疗方法。

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引用次数: 0

Three-dimensional covalent organic frameworks based on silsesquioxane for photocatalytic H2O2 production 基于硅氧烷的三维共价有机框架光催化生产H2O2

IF 8.2 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today Nano

Pub Date : 2025-12-19 DOI: 10.1016/j.mtnano.2025.100741

Saddam Hussain, Hongzhi Liu

Highly connected three-dimensional covalent organic frameworks (COFs) have gained significant attention due to their structural complexity, stability, and vast potential for various functional applications. Polyhedral oligomeric silsesquioxane (POSS) exhibits unique octahedral symmetry and poses significant challenges in constructing regular 3D frameworks due to the inherent flexibility and extensive motion of its cubane-type units. This study introduces two types highly connected 3D COFs, POSS-CTP and POSS-TZ, designed by integrating D₄h-symmetric 8-nodal OAPS with D₃h-symmetric 6-nodal hexa (4-formylphenoxy) cyclotriphosphazene (HAPCP) and 3 nodal C₃h-symmetric 4,4′,4''-(1,3,5-Triazine-2,4,6-triyl)tris (benzaldehyde) (TATA). The COFs' structure was characterized using powder X-ray diffraction (PXRD), computational simulations through Material Studio software, and Brunauer–Emmett–Teller (BET), revealing remarkable topologies: [8 + 6]'' pdp'' net and 8 + 3 "the" Topology, which led to the formation of a mesoporous structure. The COFs exhibit good crystallinity, significant thermal and chemical stability, and well-defined porous structure, making them promising candidates for potential applications. Both materials demonstrate impressive photocatalytic production of H₂O₂ achieving 4730 μmol g⁻¹ h⁻¹ for POSS-TZ and 2155 μmol g⁻¹ h⁻¹ for POSS-CTP from pure water under visible light irradiation without using any sacrificial agent. This work presents a strategy for constructing highly connected 3D POSS-based COF architectures and their application in heterogeneous photocatalysis.

高连接三维共价有机框架（COFs）由于其结构的复杂性、稳定性和各种功能应用的巨大潜力而受到广泛关注。多面体低聚硅氧烷（POSS）具有独特的八面体对称性，由于其固有的灵活性和立方型单元的广泛运动，在构建规则的3D框架方面提出了重大挑战。本研究介绍了两种高连接的三维COFs， POSS-CTP和POSS-TZ，它们是通过将d4h对称的8节点OAPS与d3h对称的6节点六（4-甲氧基苯氧基）环三磷腈（HAPCP）和3节点c3h对称的4,4′，4”-（1,3,5-三嗪-2,4,6-三基）三（苯甲醛）（TATA）集成而设计的。利用粉末x射线衍射（PXRD）、Material Studio软件的计算模拟和Brunauer-Emmett-Teller （BET）对COFs的结构进行了表征，揭示了显著的拓扑结构：[8 + 6]“pdp”网和8 + 3“The”网，这导致了介孔结构的形成。COFs具有良好的结晶度，显著的热稳定性和化学稳定性以及良好的多孔结构，使其具有潜在的应用前景。两种材料均表现出令人印象深刻的光催化H2O2产率，在可见光照射下，POSS-TZ和POSS-CTP的光催化产率分别达到4730 μmol g−1 h−1和2155 μmol g−1 h−1，而不使用任何牺牲剂。本文提出了一种构建高度连接的基于poss的三维COF结构及其在多相光催化中的应用策略。

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引用次数: 0

Electrostatically assembled open square and checkerboard superlattices 静电组装开方形和棋盘超晶格

IF 8.2 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today Nano

Pub Date : 2025-12-18 DOI: 10.1016/j.mtnano.2025.100734

Binay P. Nayak , Wenjie Wang , Honghu Zhang , Benjamin M. Ocko , Alex Travesset , Surya K. Mallapragada , David Vaknin

Programmable assembly of nanoparticles into structures other than two-dimensional hexagonal lattices remains challenging. Assembling an open checkerboard or square lattice is harder to achieve compared to a close-packed hexagonal structure. Here, we introduce a unified, robust approach to assemble nanoparticles into a diverse family of two-dimensional superlattices at the liquid–air interface. Gold nanoparticles are grafted with pH-responsive, water-soluble poly(ethylene glycol) chains terminating in COOH or

end groups, enabling control over interparticle Coloumbic interactions, while the molecular weight of grafted polymer dictates its conformation. This combined control of charges and conformation enables crystallization into checkerboard, simple-square, and body-centered honeycomb superlattices. Furthermore, tuning the pH induces structural transitions between different lattice types. This approach opens new avenues for the fabrication of colloidal superstructures with tailored architectures.

将纳米颗粒可编程组装成二维六边形晶格以外的结构仍然具有挑战性。与密集的六边形结构相比，组装一个开放的棋盘或方形晶格更难实现。在这里，我们介绍了一种统一的，强大的方法来组装纳米颗粒成一个不同的二维超晶格家族在液-气界面。金纳米颗粒接枝ph响应，水溶性聚乙二醇链终止于COOH或端基，能够控制颗粒间的哥伦布相互作用，而接枝聚合物的分子量决定了其构象。这种电荷和构象的结合控制使结晶成为棋盘状、简单方形和以体为中心的蜂窝超晶格。此外，调整pH可以诱导不同晶格类型之间的结构转变。这种方法为定制结构的胶体上层建筑的制造开辟了新的途径。

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引用次数: 0

A hollow mesoporous manganese oxide based multifunctional nanozyme with self-propelled nanomotor behavior and direct copper binding ability for synergistic therapy of glioblastoma with hypoxia alleviation 一种具有自推进纳米运动行为和铜直接结合能力的中空介孔氧化锰多功能纳米酶，用于胶质母细胞瘤缺氧缓解的协同治疗

IF 8.2 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today Nano

Pub Date : 2025-12-18 DOI: 10.1016/j.mtnano.2025.100738

Serhat Hacıibrahimoğlu , Esin Akbay Çetin , Burcu Gökçal Kapucu , İrem Yağmur Gök , Çiğdem Kip , Mustafa Polat , Mehmet Ali Onur , Ali Tuncel

A shape templating hydrothermal oxidation protocol was proposed for the synthesis of hollow, mesoporous manganese oxide nanospheres (H-MnO_x NSs). H-MnO_x NSs exhibited a photothermal conversion behavior and acted a multifunctional nanozyme behavior with peroxidase (POD)-like, oxidase (OD)-like and catalase (CAT)-like activities. CAT-like activity which was far superior with respect to the similar agents allowed fast oxygenation of tumor microenvironment for hypoxia relief and the enhancement of ROS production. A self-propelled nanomotor behavior was also observed due to the oxygen evolution from H₂O₂. Cu(II) loaded form of H-MnO_x NSs (H-MnO_x@Cu NSs) were obtained by direct interaction with Cu (II) cations. Effective generation of hydroxyl (●OH) and superoxide anion (O₂^−●) radicals by H-MnO_x@Cu NSs were demonstrated by Electron Spin Resonance (ESR) spectroscopy. POD-like activity, _●OH generation rate and GSH depletion ability markedly increased by the attachment of Cu(II) cations onto H-MnO_x NSs. Chlorine e6 (Ce6) loaded form of H-MnO_x@Cu NSs (H-MnO_x@Cu@Ce6 NSs) was evaluated as a synergistic therapy agent capable of generating ¹O₂, _●OH and O₂^−● radicals, and having photothermal, chemodynamic and photodynamic functions. T98G glioblastoma cell deaths higher than 90 % were achieved by the enhanced interaction of H-MnO_x@Cu@Ce6 NSs with the cells induced by nanomotor function, the temperature elevation stemmed from photothermal conversion, and the enhancement of chemodynamic and photodynamic functions by both temperature elevation and O₂ evolution. The effectiveness of H-MnO_x@Cu@Ce6 NSs for the inhibition of proliferation and the migration of T98G cells was also demonstrated by scratch and TUNEL assays.

提出了一种形状模板水热氧化法合成中空介孔氧化锰纳米球（H-MnOx NSs）的方法。H-MnOx NSs表现出光热转化行为，并具有过氧化物酶（POD）样、氧化酶（OD）样和过氧化氢酶（CAT）样活性的多功能纳米酶行为。CAT-like活性远优于同类药物，可快速氧合肿瘤微环境，缓解缺氧，增强ROS的产生。由于H2O2的析氧作用，还观察到自推进的纳米运动行为。通过与Cu（II）阳离子直接相互作用，制备了负载Cu（II）的H-MnOx NSs （H-MnOx@Cu NSs）。通过电子自旋共振（ESR）谱分析证实了H-MnOx@Cu NSs能有效生成羟基（●OH）和超氧阴离子（O2−●）自由基。Cu（II）阳离子附着在H-MnOx NSs上，显著提高了pod样活性、●OH生成速率和GSH耗竭能力。负载氯e6 （Ce6）形式的H-MnOx@Cu NSs （H-MnOx@Cu@Ce6 NSs）被评价为一种协同治疗剂，能够产生1O2、●OH和O2−●自由基，具有光热、化学动力和光动力功能。H-MnOx@Cu@Ce6 NSs与纳米运动功能诱导的细胞相互作用增强，光热转换引起的温度升高，温度升高和O2进化同时增强了化学动力学和光动力学功能，T98G胶质母细胞瘤细胞死亡率高于90%。通过划痕和TUNEL实验也证实了H-MnOx@Cu@Ce6 NSs对T98G细胞增殖和迁移的抑制作用。

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引用次数: 0

Hollow core-shell nanorods S-scheme heterojunctions with gradient sulfur vacancies toward optimized photocatalytic performance 具有梯度硫空位的空心核壳纳米棒s -方案异质结优化光催化性能

IF 8.2 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today Nano

Pub Date : 2025-12-17 DOI: 10.1016/j.mtnano.2025.100740

Shijie Wu , Zipeng Xing , Manliang Guo , Pingping Liu , Xinyue Liu , Zhenzi Li , Wei Zhou

Hollow core-shell nanorods S-scheme heterojunctions are fabricated by loading ZnIn₂S₄ (ZIM) with gradient sulfur vacancies onto NiFe-LDH (NFH) derived from MIL-88A. The optimal heterojunction photocatalyst ZIM/NFH (NFZ-M) demonstrates a high rate of hydrogen generation in pure water of 3.27 mmol g⁻¹ h⁻¹, roughly six times that of ZnIn₂S₄. NFZ-M also achieves a high tetracycline degradation efficiency of 99.1 % within 90 min of exposure to light. The development of the S-scheme heterojunction and hollow core-shell structure may be responsible for the superior photocatalytic performance, favoring spatial charge separation, forming internal electric field, and providing adequate surface active sites. Furthermore, strong evidence for creation of the S-scheme electron transfer pathway is provided by the analysis of carrier dynamics using femtosecond transient absorption spectroscopy, in situ X-ray photoelectron spectroscopy, and density functional theory calculations. This work offers a feasible strategy for regulating S-vacancies and offers new insights for future heterojunction design to achieve high-efficient photocatalysts.

通过在MIL-88A衍生的nfe - ldh （NFH）上加载具有梯度硫空位的ZnIn2S4 (ZIM)，制备了空心核壳纳米棒s型异质结。最佳异质结光催化剂ZIM/NFH （NFZ-M）在纯水中的产氢率为3.27 mmol g−1 h−1，约为ZnIn2S4的6倍。NFZ-M在光照射90 min内降解四环素的效率达到99.1%。s型异质结和空心核壳结构的发展可能是优越的光催化性能，有利于空间电荷分离，形成内部电场，并提供足够的表面活性位点的原因。此外，利用飞秒瞬态吸收光谱、原位x射线光电子能谱和密度泛函理论计算对载流子动力学进行了分析，为s方案电子转移途径的建立提供了有力的证据。这项工作为调节s空位提供了可行的策略，并为未来异质结设计提供了新的见解，以实现高效的光催化剂。

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引用次数: 0

A comparative study of GQDs@PEG@Mg-ZnFe2O4 and rGO@PEG@Mg-ZnFe2O4 ternary nanocomposites: Insights into dielectric, magnetic, and FMR properties for functional applications GQDs@PEG@Mg-ZnFe2O4和rGO@PEG@Mg-ZnFe2O4三元纳米复合材料的比较研究：对介电、磁和功能应用的FMR特性的见解

IF 8.2 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today Nano

Pub Date : 2025-12-17 DOI: 10.1016/j.mtnano.2025.100739

Saima Perveen, Ghulam Mustafa, Fahad Azad

The quest for high-performance electronic devices and advanced magnetics materials has necessitated the development of innovative materials to meet the rising demands in numerous applications. In this regard, a comparative study of advanced nanocomposites of ferrite material with carbonaceous material will pave the way for next-generation device technologies. This study investigates the incorporation of rGO and GQDs with a polymer PEG in Mg-ZnFe₂O_4, and their corresponding impact on the structural, magnetic, dielectric, and microwave transmission properties. Structural analysis confirmed the preparation of a mixed spinel cubic structure with no impurities, which was further verified via TEM analysis. Dielectric analysis showed that rGO@PEG@Mg-ZnFe₂O₄ ternary nanocomposite exhibited the highest dielectric permittivity (9.7 × 10⁴) with the lowest tangent loss as compared to GQDs@PEG@Mg-ZnFe₂O₄. The Nyquist plot confirmed the contribution of grain boundaries in the dielectric properties of rGO@PEG@Mg-ZnFe₂O₄ ternary nanocomposite. Magnetic studies confirmed the predominantly superparamagnetic nature, with the presence of magnetic interactions and very low coercivity in all synthesized samples. FMR spectroscopy revealed an increase in absorption (at 9 GHz, 20 GHz, 30 GHz) for GQDs@PEG@Mg-ZnFe₂O₄ ternary nanocomposite with an increased operational frequency up to 55 GHz compared to rGO@PEG@Mg-ZnFe₂O₄. Thus, these results highlight the potential of synthesized ternary nanocomposites as prospective candidates for microwave devices and low-frequency dielectric electronics applications.

对高性能电子器件和先进磁性材料的追求使得开发创新材料成为必要，以满足众多应用中不断增长的需求。在这方面，先进的铁氧体纳米复合材料与碳质材料的比较研究将为下一代器件技术铺平道路。本研究研究了在Mg-ZnFe2O4中加入rGO和GQDs与聚合物PEG，以及它们对Mg-ZnFe2O4的结构、磁性、介电和微波传输性能的影响。结构分析证实制备了无杂质的混合尖晶石立方结构，TEM分析进一步证实了这一点。电介质分析表明，与GQDs@PEG@Mg-ZnFe2O4相比，rGO@PEG@Mg-ZnFe2O4三元复合材料具有最高的介电常数（9.7 × 104）和最低的正切损耗。Nyquist图证实了晶界对rGO@PEG@Mg-ZnFe2O4三元纳米复合材料介电性能的影响。磁性研究证实了主要的超顺磁性，在所有合成样品中存在磁相互作用和非常低的矫顽力。FMR光谱显示GQDs@PEG@Mg-ZnFe2O4三元纳米复合材料的吸收增加（在9 GHz， 20 GHz, 30 GHz），与rGO@PEG@Mg-ZnFe2O4相比，工作频率增加到55 GHz。因此，这些结果突出了合成三元纳米复合材料作为微波器件和低频介电应用的潜在候选者的潜力。

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引用次数: 0