Materials Today Nano最新文献_第5页

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

Applications of adsorption microcalorimetry in heterogeneous catalysis 吸附微热法在多相催化中的应用

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

Materials Today Nano

Pub Date : 2025-12-13 DOI: 10.1016/j.mtnano.2025.100737

Yinan Liu , Yunxing Bai , Zhenxuan Yuan, Weixin Huang

The rational design of heterogeneous catalysts requires a quantitative understanding of adsorption energetics at the gas-solid interface. Adsorption microcalorimetry stands out by directly and quantitatively measuring the heat of adsorption, providing an intrinsic descriptor of catalytic reactivity. Herein we review applications of adsorption microcalorimetry in heterogeneous catalysis. After a brief introduction of various characterization techniques applied in heterogeneous catalysis, the fundamental principles and instrumental developments of adsorption microcalorimetry are overviewed, then recent advances in adsorption microcalorimetry characterization studies of both well-defined single-crystal surfaces and powder catalysts are summarized with highlights on establishing benchmark adsorption energies for testing computational methods, uncovering universal principles of size-dependent energetics and metal-support interaction, resolving site heterogeneity, correlating adsorption energetics with catalytic activity/selectivity and elucidating reaction mechanisms, finally concluding remarks and perspective on future research focuses on adsorption microcalorimetry for heterogeneous catalysis are given.

多相催化剂的合理设计需要对气固界面吸附能量的定量理解。吸附微热法通过直接定量地测量吸附热而脱颖而出，提供了催化反应性的内在描述。本文综述了吸附微热法在多相催化中的应用。在简要介绍了各种表征技术在多相催化中的应用之后，综述了吸附微热法的基本原理和仪器发展，然后总结了近年来在明确定义的单晶表面和粉末催化剂的吸附微热表征研究方面的进展，重点介绍了建立基准吸附能以测试计算方法。揭示了尺寸依赖性能量学和金属-载体相互作用的普遍原理，解决了位点非均质性，将吸附能量学与催化活性/选择性联系起来，阐明了反应机理，最后对吸附微热法在多相催化中的研究方向进行了总结和展望。

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引用次数: 0

Ultra-low-temperature sintering of TiO2 via grain boundary diffusion enabled by nanosecond laser irradiation 纳秒激光辐照实现晶界扩散的TiO2超低温烧结

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

Materials Today Nano

Pub Date : 2025-12-11 DOI: 10.1016/j.mtnano.2025.100732

Maryam Soleimani , Mohammad Nankali , Walter Duley , Xiaoye Zhao , Peng Peng , Y Norman Zhou

Sintering of metal oxide ceramics typically requires high temperatures to achieve densification; however, excessive heat often leads to grain coarsening and phase instability. In this study, nanosecond (ns) laser irradiation is employed for the first time as a pre-treatment step of TiO₂ nanoparticle to lower the sintering temperature by tailoring the microstructure at the nanoscale. During ns laser exposure, the localized high-energy input lowers the activation energy for dislocation nucleation, thereby increasing dislocation density. Subsequently, with optimized exposure duration, heat accumulation induces localized annealing, which facilitates dislocation annihilation and initiates in situ recrystallization during irradiation. This process leads to the formation of new nanoscale grains within individual nanoparticles prior to sintering. During subsequent furnace sintering at low temperature (750 °C), these laser-induced nanograins remain stable and serve as diffusion-active pathways, promoting a transition from surface diffusion to grain boundary diffusion, as confirmed by diffusion coefficient analysis. This mechanism enhances densification, reduces porosity, and improves relative density. At elevated temperatures (∼1050 °C), extreme annealing destabilizes the laser-induced nanoscale grains, effectively suppressing grain boundary-mediated diffusion. Overall, the findings demonstrate that grain boundary diffusion can drive densification at low temperatures, bypassing the conventional grain growth typically associated with ceramic sintering.

金属氧化物陶瓷的烧结通常需要高温来实现致密化；然而，过热往往导致晶粒粗化和相不稳定。在本研究中，首次采用纳秒激光照射作为TiO2纳米颗粒的预处理步骤，通过在纳米尺度上定制微观结构来降低烧结温度。在ns激光照射过程中，局域高能输入降低了位错成核的活化能，从而增加了位错密度。随后，通过优化暴露时间，热积累诱导局部退火，从而促进位错湮灭并在辐照过程中引发原位再结晶。这个过程导致单个纳米颗粒在烧结之前形成新的纳米级颗粒。扩散系数分析证实，在随后的低温（750℃）烧结过程中，这些激光诱导的纳米颗粒保持稳定，并作为扩散活性途径，促进了从表面扩散到晶界扩散的转变。这种机制增强了致密性，降低了孔隙率，提高了相对密度。在高温（~ 1050°C）下，极端退火使激光诱导的纳米级晶粒不稳定，有效地抑制晶界介导的扩散。总的来说，研究结果表明晶界扩散可以在低温下驱动致密化，绕过传统的晶粒生长通常与陶瓷烧结相关。

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引用次数: 0

Study on the influence of different pattern structures and densities of AlN substrates on the crystalline quality of GaN epitaxial thin films based on molecular dynamics simulation 基于分子动力学模拟研究氮化镓衬底不同图案结构和密度对GaN外延薄膜结晶质量的影响

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

Materials Today Nano

Pub Date : 2025-12-11 DOI: 10.1016/j.mtnano.2025.100736

Rui Li , Chunmin Cheng , Yunfei Song , Wei Shen , Gai Wu , Xiang Sun , Kang Liang , Fang Dong , Sheng Liu

During the heteroepitaxial growth of GaN, the substantial lattice mismatch and thermal expansion mismatch between the substrate and the epitaxial layer often led to a high density of structural defects, thereby severely degrading the crystalline quality and operational reliability of GaN-based devices fabricated on heterogeneous substrates. In this work, a molecular dynamics framework was established to describe the atomic-scale evolution of GaN epitaxy on patterned AlN substrates with cylindrical and prismatic geometries under different pattern densities. The effects of substrate patterning on surface morphology, crystalline quality, dislocation propagation behavior, dislocation density, and residual stress in GaN epitaxial films were systematically investigated. The results indicate that as the pattern density increases, the spacing between patterns decreased, leading to enhanced coalescence of deposited atoms under identical growth conditions. Furthermore, the prismatic patterned structure exhibited a relatively high pattern coalescence ability and demonstrated a certain degree of preferential growth in the [1–100] crystalline direction.

在GaN的异质外延生长过程中，衬底与外延层之间的晶格失配和热膨胀失配往往导致高密度的结构缺陷，从而严重降低了在异质衬底上制备的GaN基器件的晶体质量和运行可靠性。在这项工作中，建立了一个分子动力学框架来描述在不同图案密度下，氮化镓外延在具有圆柱形和棱形几何形状的氮化镓衬底上的原子尺度演化。系统地研究了衬底图像化对GaN外延薄膜表面形貌、晶体质量、位错传播行为、位错密度和残余应力的影响。结果表明，随着图案密度的增加，图案间距减小，在相同的生长条件下，沉积原子的聚并增强。此外，棱柱形图案结构表现出较高的图案聚并能力，并在[1-100]晶方向上表现出一定程度的优先生长。

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引用次数: 0

Enhancing the accuracy of atomic force microscopy measurements of Young’s modulus via force-curve-informed tip geometry fitting 通过力曲线尖端几何拟合提高原子力显微镜杨氏模量测量的准确性

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

Materials Today Nano

Pub Date : 2025-12-10 DOI: 10.1016/j.mtnano.2025.100728

Logan J. Kirsch , Jason P. Killgore , Gregory J. Rodin , Timothy S. Weeks , Filippo Mangolini

Atomic force microscopy (AFM) is widely used for nanoscale mechanical testing. However, extracting Young’s modulus from the force vs. indentation depth data remains a challenge. In this regard, uncertainties about the AFM tip geometry have been recognized as a major source of errors. Here, we propose a methodology in which the geometric approximation of the AFM tip is informed by the force vs. indentation depth data. The methodology is based on two least-square fits, one involving the force vs. indentation depth data and the other the tip profile. At the core of our methodology is the proposition that the tip geometry must be properly characterized in the interval bounded by the contact radius corresponding to the maximum indentation depth. This proposition has a solid geometric underpinning and does not require any additional assumptions. Further, there are no conceptual obstacles to applying the methodology to multi-parameter geometric models, including those based on raw image data. The methodology is successfully applied to both synthetic and physical data.

原子力显微镜（AFM）广泛用于纳米尺度的力学测试。然而，从力与压痕深度数据中提取杨氏模量仍然是一个挑战。在这方面，关于AFM尖端几何形状的不确定性已被认为是误差的主要来源。在这里，我们提出了一种方法，其中AFM尖端的几何近似是由力与压痕深度数据通知的。该方法基于两个最小二乘拟合，一个涉及力与压痕深度数据，另一个涉及尖端轮廓。我们的方法的核心是一个命题，即尖端几何形状必须在与最大压痕深度相对应的接触半径所限定的区间内得到适当的表征。这个命题有坚实的几何基础，不需要任何额外的假设。此外，将该方法应用于多参数几何模型，包括基于原始图像数据的几何模型，在概念上没有障碍。该方法成功地应用于合成数据和物理数据。

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引用次数: 0

Synthesis of ultra-thin potassium tungsten bronze single crystals with optically contrasting domains and resistive switching 具有光学对比畴和电阻开关的超薄钾钨青铜单晶的合成

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

Materials Today Nano

Pub Date : 2025-12-09 DOI: 10.1016/j.mtnano.2025.100735

Abdulsalam Aji Suleiman , Amir Parsi , Hafiz Muhammad Shakir , Hamid Reza Rasouli , Doruk Pehlivanoğlu , Talip Serkan Kasırga

Potassium tungsten bronzes (K_xWO₃) are nonstoichiometric oxides in which alkali ions, i.e., K⁺, occupy one-dimensional tunnels of the hexagonal WO₆ framework, enabling coupled ionic–electronic transport. While their bulk and nanostructured forms have been studied extensively, controlled synthesis of single-crystalline mesoscale samples suitable for device fabrication has remained limited. Here, we report a solid–liquid–solid (SLS) growth strategy that yields high-quality K_xWO₃ nanobelts with thicknesses down to ∼36 nm and lateral sizes exceeding 100 μm. The crystals display sharp optical domains arising from local variations in potassium occupancy, as confirmed by spatially resolved Raman spectroscopy and electron diffraction. Under applied bias, these domains vanish irreversibly, consistent with lateral redistribution of K⁺ ions along the tunnels. Two-terminal devices fabricated from individual nanobelts exhibit reproducible bipolar switching with resistance ratios of 10–30, characteristic short-term and long-term plasticity under pulsed excitation, and switching energies of ∼25 nJ. These results establish K_xWO₃ as a model tunnel-structured oxide for studying electric-field-driven alkali-ion migration, while also highlighting its potential for stable, analog resistive switching and iontronic memory applications.

钾钨青铜（KxWO3）是一种非化学计量氧化物，其中碱离子（即K+）占据了六方WO6框架的一维通道，从而实现了离子-电子耦合输运。虽然它们的体积和纳米结构形式已经得到了广泛的研究，但适用于器件制造的单晶中尺度样品的受控合成仍然有限。在这里，我们报告了一种固体-液体-固体（SLS）生长策略，可以产生高质量的KxWO3纳米带，其厚度低至~ 36 nm，横向尺寸超过100 μm。空间分辨拉曼光谱和电子衍射证实，晶体显示出由钾占用的局部变化引起的尖锐光学域。在施加偏置的情况下，这些畴不可逆地消失，与K+离子沿隧道的横向再分布一致。由单个纳米带制成的双端器件具有可重复的双极开关，电阻比为10-30，在脉冲激发下具有短期和长期可塑性，开关能量为~ 25 nJ。这些结果确立了KxWO3作为研究电场驱动的碱离子迁移的模型隧道结构氧化物，同时也突出了它在稳定、模拟电阻开关和离子电子存储应用方面的潜力。

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引用次数: 0

Confining-polymerization strategy to construct microporous N, S co-doped carbon for enhanced electromagnetic wave absorption 构建N， S共掺杂微孔碳增强电磁波吸收的限制聚合策略

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

Materials Today Nano

Pub Date : 2025-12-09 DOI: 10.1016/j.mtnano.2025.100733

Hongcheng Shang , Youjian Chen , Siyao Cheng , Wei Dong , Aming Xie

Constructing carbon-based materials with microporous architectures remains challenging. Herein, we propose a micropore confinement strategy employing an all-thiophene conjugated microporous polymer as the framework. Through in-situ polymerization of pyrrole monomers within the micropores followed by one-step carbonization, N and S co-doped microporous carbon materials are successfully fabricated. The resulting material not only achieves uniform incorporation of N and S atoms but also retains a well-defined microporous structure. The material benefits from optimized impedance matching and enhanced polarization loss due to N, S co-doping. The N, S co-doped microporous carbon exhibits exceptional electromagnetic wave (EMW) absorption performance, achieving a minimum reflection loss (RL_min) of −61.63 dB and an effective absorption bandwidth (EAB) of 6.32 GHz. This work provides new insights into the design of multi-heteroatom-doped microporous carbons for high-performance EMW absorption.

构建具有微孔结构的碳基材料仍然具有挑战性。在此，我们提出了一种采用全噻吩共轭微孔聚合物作为框架的微孔限制策略。通过在微孔内原位聚合吡咯单体并进行一步炭化，成功制备了N、S共掺杂微孔碳材料。所得材料不仅实现了N和S原子的均匀结合，而且保持了良好的微孔结构。由于N， S共掺杂，该材料的阻抗匹配得到了优化，极化损耗得到了增强。N， S共掺杂微孔碳具有优异的电磁波吸收性能，最小反射损耗（RLmin）为- 61.63 dB，有效吸收带宽（EAB）为6.32 GHz。这项工作为设计多杂原子掺杂的微孔碳以实现高性能EMW吸收提供了新的见解。

引用次数: 0

Development of self-oxygenated nano-MnO2 composites for enhanced antibacterial photodynamic therapy 用于增强抗菌光动力治疗的自氧纳米二氧化锰复合材料的研制

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

Materials Today Nano

Pub Date : 2025-12-08 DOI: 10.1016/j.mtnano.2025.100731

Yunze Xu , Xiongya Li , Xiaochen Feng , Xiaochang Lu , Jiawei Lin , Dingguo Luo , Ranjith Kumar Kankala , Shibin Wang , Aizheng Chen , Chaoping Fu

The rise of antibiotic resistance and the slow pace of new antibiotic discovery highlight the urgent need for alternative antimicrobial strategies. Antimicrobial photodynamic therapy (aPDT) is a promising candidate, but its efficacy is limited by shallow light penetration and hypoxic microenvironments in deep-seated infections such as abscesses and biofilms. Here, we developed a self-oxygenating nanocomposite (HTCC-MnO₂-Ce6, HMC) to overcome these barriers. Quaternized chitosan (HTCC) provided intrinsic antibacterial activity and facilitated electrostatic interactions with bacterial membranes. MnO₂ nanoparticles catalyzed endogenous hydrogen peroxide (H₂O₂) into O₂, thereby alleviating hypoxia and sustaining reactive oxygen species (ROS) generation under light irradiation. Ce6 acted as a photosensitizer to induce oxidative damage, while the HTCC matrix further promoted bacterial membrane disruption. In vitro, HMC displayed excellent cytocompatibility and achieved over 95 % bacterial reduction under hypoxic conditions. In a methicillin-resistant Staphylococcus aureus (MRSA) abscess model, treatment markedly decreased bacterial burden, attenuated inflammation, and accelerated wound closure within 14 days. Collectively, this self-oxygenating nanoplatform integrates catalytic oxygen generation, membrane-targeted antibacterial activity, and photodynamic therapy, offering a potent non-antibiotic approach for managing multidrug-resistant infections and promoting abscess healing.

抗生素耐药性的上升和新抗生素发现的缓慢步伐突出表明迫切需要替代抗微生物策略。抗菌光动力疗法（aPDT）是一种很有前途的候选药物，但其疗效受到浅光穿透和缺氧微环境的限制，深层感染如脓肿和生物膜。在这里，我们开发了一种自氧化纳米复合材料（HTCC-MnO2-Ce6， HMC）来克服这些障碍。季铵化壳聚糖（HTCC）具有固有的抗菌活性，并促进了与细菌膜的静电相互作用。MnO2纳米颗粒催化内源性过氧化氢（H2O2）转化为O2，从而缓解缺氧，维持光照射下活性氧（ROS）的生成。Ce6作为光敏剂诱导氧化损伤，而HTCC基质进一步促进细菌膜破坏。在体外，HMC表现出良好的细胞相容性，在缺氧条件下细菌减少95%以上。在耐甲氧西林金黄色葡萄球菌（MRSA）脓肿模型中，治疗在14天内显著降低了细菌负荷，减轻了炎症，并加速了伤口愈合。总的来说，这种自充氧纳米平台集成了催化氧生成、膜靶向抗菌活性和光动力治疗，为管理多药耐药感染和促进脓肿愈合提供了一种有效的非抗生素方法。

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引用次数: 0