Materials Today Nano最新文献

Construction of solvent-free polyurethane-based multifunctional electromagnetic shielding foam through the synergistic enhancement of in-situ binding of Fe3+ and CNTs 通过协同增强Fe3+和CNTs的原位结合构建无溶剂聚氨酯基多功能电磁屏蔽泡沫

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

Materials Today Nano

Pub Date : 2026-01-29 DOI: 10.1016/j.mtnano.2026.100771

Jianyan Feng , Mengyuan Li , Yang Bai , Qingquan Zhang , Qing Wang , Jiafei Sun , Shuaizhe Wang , Peng Zhang

Lightweight, flexible, highly efficient and highly stable multifunctional electromagnetic shielding materials are in high demand in both civilian and military fields. In this paper, a flexible conductive foam SFPU/Fe³⁺-CNTs was prepared by co-foaming using solvent-free polyurethane (SFPU) as the matrix and ferric chloride (FeCl₃) and carbon nanotubes (CNTs) as fillers, taking advantage of the rapid polymerization and chemical foaming mechanism of SFPU. Then, a lightweight and compressible CNTs@SFPU/Fe³⁺-CNTs electromagnetic shielding foam was fabricated by ultrasonic-assisted impregnation of CNTs. The composition, microstructure and electromagnetic shielding performance of the flexible conductive foam were analyzed by FT-IR, XRD, SEM and vector network analyzer, and the mechanism of the synergistic enhancement of electromagnetic shielding performance by FeCl₃ and CNTs was explored. Thanks to the unique porous structure for dissipating electromagnetic waves and the synergistic shielding effect of FeCl₃ and CNTs, the foam exhibited a high electromagnetic interference shielding performance of 52 dB in the X-band and a high specific shielding effectiveness of 595.4 dB/(g/cm³) at a thickness of 3 mm. Moreover, the foam maintained its efficient electromagnetic shielding performance after compression cycles, water washing and tape peeling. Finally, the thermal insulation and flame retardant properties of the conductive foam were investigated, greatly expanding its practical application scenarios. This work presents a simple and scalable method for fabricating lightweight and efficient electromagnetic shielding materials for applications in civil, aerospace, military, and other fields.

轻质、柔韧、高效、高稳定的多功能电磁屏蔽材料在民用和军用领域都有很高的需求。本文利用SFPU的快速聚合和化学发泡机理，以无溶剂聚氨酯（SFPU）为基体，氯化铁（FeCl3）和碳纳米管（CNTs）为填料，通过共发泡法制备了柔性导电泡沫SFPU/Fe3+-CNTs。然后采用超声辅助浸渍法制备了重量轻、可压缩的CNTs@SFPU/Fe3+-CNTs电磁屏蔽泡沫。采用FT-IR、XRD、SEM和矢量网络分析仪分析了柔性导电泡沫的组成、微观结构和电磁屏蔽性能，探讨了FeCl3和CNTs协同增强电磁屏蔽性能的机理。由于其独特的多孔结构和FeCl3与CNTs的协同屏蔽作用，该泡沫在x波段具有52 dB的高电磁干扰屏蔽性能，在厚度为3 mm时具有595.4 dB/(g/cm3)的比屏蔽效能。此外，经过压缩循环、水洗和胶带剥离后，泡沫仍能保持其高效的电磁屏蔽性能。最后，对导电泡沫的保温阻燃性能进行了研究，极大地拓展了导电泡沫的实际应用场景。这项工作提出了一种简单、可扩展的方法，用于制造轻质、高效的电磁屏蔽材料，用于民用、航空航天、军事和其他领域。

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引用次数: 0

Manipulation of nitrogen doping levels in SiC nanowires and their negatively correlated microwave absorption properties SiC纳米线中氮掺杂水平的控制及其负相关微波吸收性能

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

Materials Today Nano

Pub Date : 2026-01-29 DOI: 10.1016/j.mtnano.2026.100770

Jingwen Deng , Huimin Liu , Qing'an Cui , Bing Liu , Liyuan Han , Jie Pu , Hejun Li , Xuemin Yin

Silicon carbide nanowires (SiCnws) are promising microwave absorbers, yet their performance is limited by a low dielectric constant and a lack of magnetic loss. While doping offers a potential solution, controlling doping levels in SiCnws remains challenging, and its effect on absorption performance is unclear. In this study, we developed a simple chemical vapor deposition (CVD) method to prepare nitrogen-doped SiCnws with tunable nitrogen content on carbon fiber cloth. By adjusting the nitrogen amount, the microstructure and electromagnetic parameters of SiCnws could be regulated, and their effect on the electromagnetic wave absorption ability was further investigated. Surprisingly, the absorption capacity of SiCnws decreased with increasing nitrogen content. Compared to nitrogen-doped SiCnws, undoped SiCnws exhibited the best absorption performance, achieving an effective absorption bandwidth of 4.17 GHz (13.83–18 GHz, 1.30 mm thickness) and a minimum reflection loss of −37.15 dB (1.40 mm thickness). This unexpected trend is attributed to the imbalance between dielectric constant and magnetic permeability caused by small atom doping. This study not only provides a simple method for regulating the nitrogen doping levels in SiCnws but also offers insights for the development of SiCnws-based microwave absorbers.

碳化硅纳米线（SiCnws）是一种很有前途的微波吸收材料，但其性能受到介电常数低和缺乏磁损耗的限制。虽然掺杂提供了一个潜在的解决方案，但控制SiCnws中的掺杂水平仍然具有挑战性，并且其对吸收性能的影响尚不清楚。在这项研究中，我们开发了一种简单的化学气相沉积（CVD）方法，在碳纤维布上制备氮掺杂的SiCnws，其氮含量可调。通过调节氮量，可以调节SiCnws的微观结构和电磁参数，并进一步研究其对电磁波吸收能力的影响。令人惊讶的是，SiCnws的吸收能力随着氮含量的增加而下降。与氮掺杂的SiCnws相比，未掺杂的SiCnws表现出最好的吸收性能，有效吸收带宽为4.17 GHz （13.83-18 GHz， 1.30 mm厚度），最小反射损耗为−37.15 dB （1.40 mm厚度）。这种意想不到的趋势是由于小原子掺杂导致介电常数和磁导率之间的不平衡。该研究不仅为调控SiCnws中氮掺杂水平提供了一种简单的方法，而且为SiCnws基微波吸收剂的开发提供了新的思路。

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引用次数: 0

Study on multi-physical coupling characteristics of ordered porous tungsten oxide films based on oxygen vacancy regulation 基于氧空位调控的有序多孔氧化钨膜多物理耦合特性研究

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

Materials Today Nano

Pub Date : 2026-01-25 DOI: 10.1016/j.mtnano.2026.100766

Lingna Jia, Panzhe Hou, Tianen Liu, Aiqi Zhang, Peipei Lu, Lihu Liu, Junmeng Zhang, Huiyuan Sun

A well-ordered WO₃ nanoporous array structure was successfully fabricated on anodized aluminum oxide using direct-current magnetron sputtering technology. The experiment revealed that the sample exhibited significant room-temperature ferromagnetism, resistive switching behavior, and ferroelectricity. Moreover, a strong coupling effect was observed between their ferromagnetism and the electrical properties. Through annealing treatments under various atmospheres, combined with photoluminescence spectroscopy, X-ray photoelectron spectroscopy, and Kelvin probe force microscopy analyses, it was demonstrated that the evolution of these observed properties is closely related to the oxygen vacancies that captured single electrons. These findings provide experimental evidence for the application of wide-bandgap metal oxides in novel multi-physical memory devices, intelligent equipment, and spintronics systems.

采用直流磁控溅射技术，在阳极氧化铝表面成功制备了有序的WO3纳米孔阵列。实验表明，该样品具有明显的室温铁磁性、电阻开关性能和铁电性。此外，它们的铁磁性和电学性质之间存在很强的耦合效应。通过不同气氛下的退火处理，结合光致发光光谱、x射线光电子能谱和开尔文探针力显微镜分析，证明了这些观察到的性能的演变与捕获单电子的氧空位密切相关。这些发现为宽带隙金属氧化物在新型多物理存储器件、智能设备和自旋电子学系统中的应用提供了实验依据。

引用次数: 0

Elucidation dynamics of ZnO and ZrO2 in catalytic CO2 Hydrogenation: An in-situ TEM study 催化CO2加氢过程中ZnO和ZrO2的解析动力学：原位TEM研究

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

Materials Today Nano

Pub Date : 2026-01-24 DOI: 10.1016/j.mtnano.2026.100765

Lizhuo Wang , Yasuhiro Sakamoto , Ang Li , Xin Fang , Yuhan Men , Penny Xiao , Paul A. Webley , Xiaodong Han , Jun Huang

Cu/ZnO/ZrO₂ (CZZ) catalysts are widely used in CO₂ hydrogenation to methanol. However, their structural dynamics under reaction conditions and related reaction mechanism remain unclear. In this study, we employed in-situ transmission electron microscopy (TEM) to investigate structural changes in Cu/ZnO/ZrO₂ catalysts under CO₂ and H₂/CO₂ environments at 200 °C and 250 °C. Under CO₂ conditions, coexisting CuO and ZnO phases were observed along with a diminishing crystalline ZrO₂ phase. Under H₂/CO₂ conditions, dynamic formation and evolution of a CuZn alloy phase occurred, accompanied by the reappearance of crystalline ZrO₂ nanoparticles. It is also noted that copper in Cu/ZnO/ZrO₂ is difficult to be completely reduced in a H₂/CO₂ environment, in contrast to un-supported CuO nanoparticles. These results suggest a distinct function of ZrO₂ and ZnO support in the catalyst, which alters the catalytic performance of the CZZ system. The findings of this study provide new insight into the dynamic behavior of CZZ catalysts under actual reaction conditions.

Cu/ZnO/ZrO2 （CZZ）催化剂广泛应用于CO2加氢制甲醇。然而，它们在反应条件下的结构动力学和相关的反应机理尚不清楚。本研究采用原位透射电镜（TEM）研究了Cu/ZnO/ZrO2催化剂在200°C和250°C的CO2和H2/CO2环境下的结构变化。在CO2条件下，CuO相和ZnO相共存，ZrO2相逐渐减少。在H2/CO2条件下，CuZn合金相的动态形成和演化伴随着ZrO2纳米颗粒结晶的重现。研究还发现，Cu/ZnO/ZrO2中的铜在H2/CO2环境中很难被完全还原，而非CuO纳米颗粒。这些结果表明ZrO2和ZnO载体在催化剂中具有明显的作用，从而改变了CZZ体系的催化性能。本研究结果对实际反应条件下CZZ催化剂的动力学行为提供了新的认识。

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引用次数: 0

Hydrothermal growth dynamics of TiO2 nanorods on p-Si: Linking reaction time to structural evolution and optoelectronic device performance p-Si上TiO2纳米棒的水热生长动力学：反应时间与结构演变和光电子器件性能的联系

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

Materials Today Nano

Pub Date : 2026-01-23 DOI: 10.1016/j.mtnano.2026.100759

Selcuk Izmirli , Sukru Cavdar

In this study, the structural, morphological, and electrical properties of TiO₂ nanorod (TNR)-based heterojunction devices synthesized on p-Si substrates using the hydrothermal method for different durations were comprehensively investigated. During the production process, reaction kinetics and growth dynamics were also evaluated; ion transport and crystal growth activities were discussed in detail, starting from the nucleation stage. SEM images showed that the lengths of TNR structures produced with hydrothermal reaction times of 1, 2, 3, and 4 h increased from 355 nm to 1.78 μm, while their diameters increased from 30–40 nm to 280–300 nm. XRD analyses revealed that the dominant phase in all samples was rutile TiO₂, and that the growth dynamics occurred in the (101) plane, while growth in the (002) and (110) planes supported the formation of the crystal structure. In the I-V characterization of heterojunction devices produced with TNRs of different thicknesses, devices with thin TNR interfaces stood out with their strong rectification behavior, low ideality factors, and strong photodiode performance. However, with the growth of TNR structures, the diode character was lost. In the photodetector performance metrics of the devices, devices with thin TNR interfaces also exhibited higher photoresponsivity (R_ph) and photosensitivity (S_ph) behavior. Furthermore, these devices offered high detectivity (D∗) even at low light intensities. The results obtained confirm that the hydrothermal production parameters optimized in this study are crucial for TNR morphology.

在本研究中，采用水热法在p-Si衬底上合成了基于TiO2纳米棒（TNR）的异质结器件，并对其结构、形态和电性能进行了全面研究。在生产过程中，对反应动力学和生长动力学进行了评价；从成核阶段开始，详细讨论了离子输运和晶体生长活性。SEM图像显示，经过1、2、3和4 h的水热反应，得到的TNR结构的长度从355 nm增加到1.78 μm，直径从30 ~ 40 nm增加到280 ~ 300 nm。XRD分析表明，所有样品的优势相均为金红石型TiO2，生长动力学发生在（101）平面，而（002）和（110）平面的生长支持晶体结构的形成。在用不同厚度的TNR制作的异质结器件的I-V表征中，具有薄TNR接口的器件以其强整流行为、低理想因数和强光电二极管性能而脱颖而出。然而，随着TNR结构的增长，二极管特性逐渐丧失。在器件的光电探测器性能指标中，具有薄TNR接口的器件也表现出更高的光响应性（Rph）和光敏性（Sph）行为。此外，这些装置即使在低光强下也能提供高探测性（D *）。研究结果证实了本研究优化的热液生产参数对TNR形貌的影响至关重要。

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引用次数: 0

2-Dimensional black phosphorus nanostructures for biomedical applications 生物医学应用的二维黑磷纳米结构

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

Materials Today Nano

Pub Date : 2026-01-20 DOI: 10.1016/j.mtnano.2026.100763

Govinakere M. Dhanush , Chitradurga K. Praveen Kumar , K. Pramoda , Hamse Kameshwar Vivek , Yarabahally R. Girish

Two-dimensional black phosphorus (2D-BP), a puckered layered phosphorus nanomaterial, is a promising candidate for various biomedical applications due to its unique physicochemical properties, including good biocompatibility, tunable band gap, high carrier mobility, large surface-to-volume ratio, and excellent biodegradability. BP is a promising candidate for various biomedical applications. Recent research on biomedical fields emphasizes its viable in mitigating bacterial infections, good biocompatibility and promoting wound healing, which are critical challenges in modern medicine, especially in chronic and infected wounds. This review focuses on the latest development of black phosphorus for potential use in Tumor treatment, bioimaging, antibacterial, drug delivery and wound healing applications which we are discussed here. In addition to this we also examine ongoing progress of BP-incorporated composites and targeted delivery systems, and overcome the dominant existing challenges like material stability, cytotoxicity, and scalability. The review concludes with insights into future directions and potential clinical translation.

二维黑磷（2D-BP）是一种皱褶状层状磷纳米材料，具有良好的生物相容性、可调节的带隙、高载流子迁移率、大的表面体积比和优异的生物降解性等独特的物理化学性质，在生物医学领域具有广阔的应用前景。BP是一种很有前途的生物医学应用候选者。近年来生物医学领域的研究强调其在减轻细菌感染、良好的生物相容性和促进伤口愈合方面的可行性，这是现代医学，特别是慢性和感染伤口的关键挑战。本文就黑磷在肿瘤治疗、生物成像、抗菌、给药和伤口愈合等方面的最新研究进展作一综述。除此之外，我们还研究了bp复合材料和靶向递送系统的持续进展，并克服了材料稳定性、细胞毒性和可扩展性等主要挑战。综述总结了对未来发展方向和潜在临床翻译的见解。

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引用次数: 0

Development strategies for sorafenib-based targeted radiotheranostic biomaterials: From targeted delivery to multimodal monitoring 基于索拉非尼的靶向放射治疗生物材料的发展策略：从靶向递送到多模式监测

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

Materials Today Nano

Pub Date : 2026-01-18 DOI: 10.1016/j.mtnano.2026.100762

Zijing Li , Luqi Song , Zheyi Shi , Yi Feng , Ran Zhu , Wei Chen , Jiaming Xie

Hepatocellular carcinoma (HCC) is one of the significant threats to human health worldwide, and its conventional treatments have obvious limitations. With the development of nanomedicine, the strategy of integrating multiple therapeutic approaches into a single nanoplatform is expected to lead to more efficient treatment of tumors. This study utilizes the nanomaterial PCN-224 as a carrier, labels it with ¹⁷⁷Lu, and modifies its surface with sorafenib (SOR) to construct an integrated diagnostic and therapeutic nanoplatform. The surface modification of SOR not only functions as targeted therapy (TT), but also enhances the active targeting of the nanoparticles and their accumulation at the tumor site. This in vivo distribution could be monitored by dual-modality imaging using fluorescence imaging and SPECT/CT imaging. The long retention allows ¹⁷⁷Lu-mediated radioisotope therapy (RIT) to continue working inside the tumor, thereby improving the limitations of photodynamic therapy (PDT), where the depth of light penetration is limited. Additionally, all three therapeutic modalities can act as inducers of immunogenic cell death (ICD), thereby further enhancing the therapeutic effects by activating the immune response. In conclusion, this work designs a combined triple therapy of PDT-RIT-TT to treat HCC through the direct killing effect and the indirect effect of ICD, utilizing multiple synergistic effects to improve the shortcomings of single therapy, and shows promising prospects for clinical application.

肝细胞癌（HCC）是全球范围内威胁人类健康的重要疾病之一，其常规治疗方法存在明显局限性。随着纳米医学的发展，将多种治疗方法整合到单一纳米平台的策略有望带来更有效的肿瘤治疗。本研究以纳米材料PCN-224为载体，用177Lu对其进行标记，并用sorafenib （SOR）修饰其表面，构建了一个集成诊断和治疗的纳米平台。SOR的表面修饰不仅具有靶向治疗（TT）的功能，而且增强了纳米颗粒的活性靶向及其在肿瘤部位的蓄积。这种体内分布可以通过荧光成像和SPECT/CT成像的双模成像来监测。长时间的滞留使177lu介导的放射性同位素治疗（RIT）能够在肿瘤内继续工作，从而改善光动力治疗（PDT）的局限性，其中光穿透深度有限。此外，所有三种治疗方式都可以作为免疫原性细胞死亡（ICD）的诱导剂，从而通过激活免疫反应进一步增强治疗效果。综上所述，本工作设计了PDT-RIT-TT三联疗法，通过ICD的直接杀伤作用和间接作用治疗HCC，利用多重协同作用改善单一治疗的不足，具有良好的临床应用前景。

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引用次数: 0

Atomistic insights into the hydrogen poisoning effect in ammonia synthesis over Ru surfaces from dynamic first-principles microkinetic modeling 从动力学第一性原理微动力学模型对Ru表面氨合成中氢中毒效应的原子见解

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

Materials Today Nano

Pub Date : 2026-01-17 DOI: 10.1016/j.mtnano.2026.100761

Lu Wang, Bo Yang

Hydrogen poisoning strongly suppresses the activity of Ru-based catalysts for ammonia synthesis, yet its atomistic origin remains unclear. In this study, we systematically investigate the influence of hydrogen coverage on the dynamic kinetics and mechanism of ammonia synthesis across three representative ruthenium, Ru(0001), Ru(10

\overline{1}

1), and Ru-step surface. We find that under hydrogen-poisoning conditions, all investigated surfaces follow an associative reaction mechanism. A notable shift in the reaction pathway and degree of rate control is observed on both the Ru(0001) and Ru-step surfaces as a function of hydrogen coverage, revealing a coverage-dependent evolution of the rate-determining steps. Our results also demonstrate that the Ru-step surface consistently exhibits the highest intrinsic activity. Under hydrogen-rich conditions, this surface achieves a turnover frequency of 1.36 × 10⁻² s⁻¹ and a reaction order with respect to H₂ of −0.25 at 673 K and 1 MPa, in excellent agreement with experimental observations under identical conditions. This quantitative consistency underscores that the hydrogen-covered surface, rather than the clean surface, represents the true catalytic state under working conditions. These findings provide fundamental atomic-scale insights into the origin of hydrogen poisoning and establish a theoretical foundation for the rational design of next-generation Ru-based catalysts.

氢中毒强烈抑制了钌基合成氨催化剂的活性，但其原子起源尚不清楚。在本研究中，我们系统地研究了氢覆盖对三种具有代表性的钌，Ru(0001), Ru（10.1）和Ru-step表面的氨合成动力学和机理的影响。我们发现在氢中毒条件下，所有被研究的表面都遵循缔合反应机制。在Ru（0001）和Ru步表面上观察到反应路径和速率控制程度的显著变化，作为氢覆盖的函数，揭示了速率决定步骤的覆盖依赖演化。我们的结果还表明，Ru-step表面始终表现出最高的固有活性。在富氢条件下，在673 K和1 MPa下，该表面的周转率为1.36 × 10−2 s−1，对H2的反应阶数为−0.25，与相同条件下的实验结果非常吻合。这种定量的一致性强调了氢覆盖的表面，而不是干净的表面，代表了工作条件下的真实催化状态。这些发现为氢中毒的起源提供了基本的原子尺度的见解，并为下一代钌基催化剂的合理设计奠定了理论基础。

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引用次数: 0

Fluorescent protein-inspired hypoxia-activatable nanoparticles for synergistic two photon photodynamic and photothermal therapy 用于协同双光子光动力和光热治疗的荧光蛋白激发低氧活化纳米颗粒

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

Materials Today Nano

Pub Date : 2026-01-16 DOI: 10.1016/j.mtnano.2026.100758

Wan Feng , Ying Qian , Yibing Xie

Hypoxia-activated fluorescent protein nanoparticles (NPs) were synthesized for synergistic two-photon photodynamic/photothermal therapy. QPFPO, a phenothiazine-derived tetrameric fluorescent protein chromophore analogue, was synthesized by Knoevenagel condensation, with its S and N heteroatoms serving to promote intersystem crossing. Subsequently, QPFPO and the hypoxia-activated prodrug tirapazamine (TPZ) were co-assembled with DSPE-PEG-FA to form QPFPO@TPZ NPs. Quantum chemical calculations and femtosecond transient absorption spectroscopy demonstrate that QPFPO enhances Type I and Type II reactive oxygen species (ROS) generation through photo-induced molecular twisting and symmetry-breaking charge separation mechanisms. Under one-photon excitation, QPFPO exhibits absorption/emission redshifts from 460 nm/625 nm–500 nm/696 nm. Singlet oxygen, superoxide radicals, and hydroxyl radicals are generated by QPFPO@TPZ NPs upon exposure to 460 nm light. QPFPO@TPZ NPs achieve localized hyperthermia with a photothermal conversion efficiency of 39.39 %, effectively inducing tumor cell apoptosis. The two-photon absorption cross-section of QPFPO@TPZ NPs is 31 GM at 800 nm in aqueous solution, which is sufficient for bright two-photon fluorescence imaging in cancer cells. Furthermore, in zebrafish xenograft models, two-photon photodynamic therapy led to a 51 % reduction in tumor volume, which significantly enhanced the overall treatment efficacy. For the treatment of human hypoxic tumors, QPFPO@TPZ NPs offer a promising strategy as a hypoxia-targeted photosensitizer operable under two-photon excitation.

合成了缺氧激活的荧光蛋白纳米颗粒（NPs），用于协同双光子光动力/光热治疗。QPFPO是一种由吩噻嗪衍生的四聚体荧光蛋白发色团类似物，通过Knoevenagel缩合合成，其S和N杂原子促进了系统间的交叉。随后，QPFPO和缺氧激活的前药替拉帕嗪（TPZ）与DSPE-PEG-FA共同组装形成QPFPO@TPZ NPs。量子化学计算和飞秒瞬态吸收光谱表明，QPFPO通过光诱导分子扭曲和对称破缺电荷分离机制增强了I型和II型活性氧（ROS）的生成。在单光子激发下，QPFPO表现出460 nm/625 nm - 500 nm/696 nm的吸收/发射红移。单重态氧、超氧自由基和羟基自由基由QPFPO@TPZ NPs在460 nm光下产生。QPFPO@TPZ NPs实现局部热疗，光热转换效率为39.39%，有效诱导肿瘤细胞凋亡。QPFPO@TPZ NPs在水溶液中800 nm处的双光子吸收截面为31 GM，足以在癌细胞中进行明亮的双光子荧光成像。此外，在斑马鱼异种移植模型中，双光子光动力治疗导致肿瘤体积减少51%，显着提高了整体治疗效果。对于人类低氧肿瘤的治疗，QPFPO@TPZ NPs作为一种在双光子激发下可操作的低氧靶向光敏剂提供了一种很有前途的策略。

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引用次数: 0

Mechanical behavior of metal-organic framework monoliths with enhanced fracture toughness 增强断裂韧性的金属有机骨架整体的力学行为

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

Materials Today Nano

Pub Date : 2026-01-16 DOI: 10.1016/j.mtnano.2026.100760

Mounir El Skafi , Hendrik Vondracek , James D. Taylor , Gianfelice Cinque , Jin-Chong Tan

A facile approach is demonstrated for synthesizing a mechanically tough ZIF-71 [Zn(dcIm)₂; dcIm = 4,5-dichloroimidazole] monoliths with a polymer binder, employing namely poly-methyl methacrylate (PMMA) through a sol-gel process. The addition of a slight polymer binder (∼10 wt%) to the sol-gel mixture is shown to enhance the mechanical properties such as the elastic modulus, hardness, fracture toughness, strain hardening, and creep behavior of the composite monoliths compared to the pure ZIF-71 monoliths. Nitrogen sorption measurements revealed that the composite monoliths have a high surface area (∼350 m²/g) although it was reduced from ∼600 m²/g due to pore blockage by the polymer. Composite monoliths exhibit less surface cracks and are relatively stiffer but are notably tougher than the pure ZIF-71 monoliths as the fracture toughness tripled from around 0.15 MPa m^1/2 to around 0.45 MPa m^1/2. Despite the incorporation of a small quantity of polymer in the monolith, this has a significant impact on increasing the mechanical stiffness, hardness and fracture resistance of the resulting monoliths. Creep response observed under a constant load revealed the presence of PMMA incorporated in the composite monolith. Nearfield infrared (IR) nanospectroscopy via Fourier transform IR (nanoFTIR) and pseudoheterodyne (PsHet) scattering-Scanning Nearfield Optical Microscopy (s-SNOM) IR imaging on plastically deformed and indented surfaces revealed local chemical structure-mechanical interactions. Our findings suggest that the polymer chains are trapped inside the ZIF-71 structure, thereby improving the mechanical resilience that might pave the way to future scaling up of MOF monoliths for practical applications and durable devices.

一种简单的方法证明了合成具有机械韧性的ZIF-71 [Zn(dcIm)2；dcIm = 4,5-二氯咪唑]单体，采用聚合物粘合剂，即聚甲基丙烯酸甲酯（PMMA），通过溶胶-凝胶工艺。与纯ZIF-71单体相比，在溶胶-凝胶混合物中添加少量聚合物粘合剂（~ 10 wt%）可以提高复合单体的力学性能，如弹性模量、硬度、断裂韧性、应变硬化和蠕变行为。氮吸附测量显示，复合单体具有很高的表面积（~ 350 m2/g），尽管由于聚合物堵塞孔隙，它从~ 600 m2/g减少。复合单块体表面裂纹较少，相对更硬，但明显比纯ZIF-71单块体更坚韧，断裂韧性从0.15 MPa m1/2左右增加到0.45 MPa m1/2左右。尽管在整体中掺入了少量聚合物，但这对提高整体的机械刚度、硬度和抗断裂性有显著影响。在恒定载荷下观察到的蠕变响应揭示了PMMA掺入复合整体中的存在。近场红外（IR）纳米光谱通过傅里叶变换红外（nanoFTIR）和伪外差（PsHet）散射扫描近场光学显微镜（s-SNOM）红外成像的塑性变形和缩进表面揭示了局部化学结构-力学相互作用。我们的研究结果表明，聚合物链被困在ZIF-71结构中，从而提高了机械弹性，这可能为未来扩大MOF单体的实际应用和耐用设备铺平道路。

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引用次数: 0