Nano-Structures & Nano-Objects最新文献_第6页

Role of Al3 + ion substitution in modulating conductivity and interfacial polarization in CoNiCuZn spinel ferrite: Cation distribution study Al3 +离子取代对CoNiCuZn尖晶石铁氧体电导率和界面极化的调节作用：阳离子分布研究

IF 5.45 Q1 Physics and Astronomy

Nano-Structures & Nano-Objects

Pub Date : 2025-10-22 DOI: 10.1016/j.nanoso.2025.101566

M.A. Almessiere , A. Baykal , S.E. Shirsath , M.A. Gondal , Md Amir , Y. Slimani

The current study examines the effect of Al³⁺ ion substitution (x = 0.00 – 0.10) on the electrical and dielectric properties of host Co_0.25Ni_0.25Zn_0.25Cu_0.25Fe₂O₄ spinel ferrite nanoparticles (Al → CoNiZnCu SFNPs) which have been synthesized via sol-gel auto combustion method. XRD (X-ray powder Diffraction) analysis confirmed the cubic spinel structure of all products. The crystallite size (D_XRD) varies between 35 and 36 nm. AC conductivity increased with frequency (f) and temperature (T), confirming polaron hopping mechanisms. Al³ ⁺ ion substitution altered charge transport by disrupting Fe²⁺–Fe³ ⁺ hopping, increasing resistivity up to x = 0.06 and slightly recovering at higher x due to microstructural effects. Activation energies (Ea), derived from Arrhenius plots, peaked at x = 0.06 and decreased at both extremes, reflecting variable charge mobility. The dielectric constant (ε′) showed strong frequency (f) dispersion and Temperature (T) dependence, decreasing with Al³ ⁺ ion content but rising again at x = 0.08. Dielectric loss (tan δ) revealed relaxation peaks and high loss values at x = 0.06 and 0.10, indicating interfacial polarization and grain boundary conduction. Cole–Cole impedance plots confirmed non-Debye relaxation with dual grain and grain boundary contributions, shifting with Al³ ⁺ ion content and T. These findings confirmed that Al³ ⁺ ion substitution can effectively tune the electrical & dielectric behavior of host Co_0.25Ni_0.25Zn_0.25Cu_0.25Fe₂O₄ SFNPs for functional device applications.

本研究考察了Al3+离子取代（x = 0.00 - 0.10）对采用溶胶-凝胶自燃烧法合成的Co0.25Ni0.25Zn0.25Cu0.25Fe2O4尖晶石铁素体纳米粒子（Al→CoNiZnCu SFNPs）电学和介电性能的影响。XRD （x射线粉末衍射）分析证实了所有产物的立方尖晶石结构。晶体尺寸（DXRD）在35 ~ 36 nm之间。交流电导率随频率(f)和温度(T)的增加而增加，证实了极化子跳变机制。Al³ +离子取代通过破坏Fe²+ -Fe³ +跳变改变电荷输运，电阻率升高至x = 0.06，由于微结构效应在更高x处略有恢复。由Arrhenius图得到的活化能（Ea）在x = 0.06处达到峰值，在两个极端处都有所下降，反映了电荷迁移率的变化。介电常数ε′表现出较强的频率(f)色散和温度(T)依赖性，随着Al³ +离子含量的增加而降低，但在x = 0.08时又升高。介电损耗（tan δ）在x = 0.06和0.10处出现弛豫峰和高损耗值，表明界面极化和晶界导电。Cole-Cole阻抗图证实了双晶界和晶界贡献的非debye弛豫，并随着Al³ +离子含量和t的变化而变化。这些发现证实了Al³ +离子取代可以有效地调节Co0.25Ni0.25Zn0.25Cu0.25Fe2O4 SFNPs的介电行为，用于功能器件应用。

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引用次数: 0

Therapeutic potential of chitosan-encapsulated phytochemicals: A review on antimicrobial strategies against nosocomial infections 壳聚糖包封植物化学物质的治疗潜力：抗医院感染的抗菌策略综述

IF 5.45 Q1 Physics and Astronomy

Nano-Structures & Nano-Objects

Pub Date : 2025-10-21 DOI: 10.1016/j.nanoso.2025.101565

Mostafa Mohammed Atiyah, Smitha Vijayan

Nosocomial infections, exacerbated by the rise in antimicrobial resistance, represent a critical challenge to global healthcare systems. In response, nanotechnology-integrated phytotherapy has emerged as a promising alternative to conventional antibiotics. This review systematically examines the therapeutic potential of chitosan nanoparticles (ChNPs) as carriers for plant-derived bioactive compounds, with a particular focus on their synergistic antimicrobial, antifungal, and antibiofilm activities. Chitosan (CS), a biodegradable and biocompatible polysaccharide, enhances the stability, solubility, and targeted delivery of encapsulated phytochemicals, thereby amplifying their efficacy against drug-resistant pathogens. We discuss the synthesis, physicochemical properties, and mechanisms of action of chitosan-phytochemical nanoconjugates, including membrane disruption, DNA binding, and metal chelation. Emphasis is placed on recent in vitro and in vivo studies demonstrating enhanced antimicrobial performance and the translational potential of these nanoformulations in clinical settings. Challenges such as cytotoxicity, scalability, and regulatory barriers are critically examined. This review highlights the convergence of green nanotechnology and phytomedicine as a forward-looking strategy for developing next-generation therapeutics to combat healthcare-associated infections.

因抗菌素耐药性上升而加剧的医院感染是对全球卫生保健系统的重大挑战。因此，纳米技术集成的植物疗法已经成为传统抗生素的一种有希望的替代方案。本文系统地研究了壳聚糖纳米颗粒（ChNPs）作为植物源性生物活性化合物载体的治疗潜力，特别关注其协同抗菌、抗真菌和抗生物膜活性。壳聚糖（CS）是一种具有生物相容性和可生物降解性的多糖，可提高包封植物化学物质的稳定性、溶解度和靶向递送能力，从而增强其抗耐药病原体的功效。我们讨论了壳聚糖-植物化学纳米缀合物的合成、物理化学性质和作用机制，包括膜破坏、DNA结合和金属螯合。重点放在最近的体外和体内研究上，证明了这些纳米制剂在临床环境中的增强抗菌性能和转化潜力。挑战，如细胞毒性，可扩展性和监管障碍进行了严格审查。这篇综述强调了绿色纳米技术和植物医学的融合是开发下一代治疗方法以对抗卫生保健相关感染的前瞻性策略。

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引用次数: 0

Plant-mediated synthesis of selenium nanoparticles via Juglans regia and Mentha piperita: A dual-source approach for antimicrobial applications 通过核桃和薄荷植物介导的硒纳米颗粒合成：抗菌应用的双源方法

IF 5.45 Q1 Physics and Astronomy

Nano-Structures & Nano-Objects

Pub Date : 2025-10-15 DOI: 10.1016/j.nanoso.2025.101563

Ömer Ödemiş , Yusuf Alan , Mehmet Salih Ağırtaş

The present study examines two selenium nanoparticles were synthesized at room temperature using extracts of Juglans regia L (green husk walnut) and Mentha piperita L (peppermint). The characteristic structures of GHW-SeNPs and MP-SeNPs were investigated using analytical techniques such as UV-Vis spectroscopy, Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), and X-ray diffraction (XRD). These characterization techniques have revealed both the reducing and stabilizing properties of the organic compounds in the structure of the plants used in the formation of SeNPs. GHW-SeNPs were found to have a polydisperse structure with an average diameter of 66.43 nm, while MP-SeNPs were observed to have a spherical structure and smaller dimensions (average diameter of 23.86 nm). The crystallite size of GHW-SeNPs was determined to be 57.74 nm, while MP-SeNPs were found to be quite pure and measured 29.1 nm. FTIR graphs show that the organic compounds surrounding the selenium atom significantly contribute to the reduction of selenium and the formation of nanoparticles. The biological activities of SeNPs were tested on 3 Gram-positive bacteria (Staphylococcus aureus, Bacillus subtilis, Bacillus megaterium), 4 Gram-negative bacteria (Escherichia coli, Klebsiella pneumonia, Pseudomonas aeruginosa, Enterobacter aerogenes) and 3 fungi (Candida albicans, Yarrowia lipolytica, Saccharomyces cerevisiae). GHW-SeNPs used at increasing concentrations exhibited the best antibacterial activity against Staphylococcus aureus and Klebsiella pneumoniae with inhibition zone diameters of 25 mm. MP-SeNPs exhibited more antifungal activity, showing high activity against Candida albicans with an inhibition zone diameter of 24 mm. The data obtained on the activities of the MP-SeNP and GHW-SeNP particles we synthesized using an environmentally friendly method will contribute to future pharmacological studies.

本研究研究了两种硒纳米粒子在室温下合成的方法，分别使用绿壳核桃和薄荷提取物。采用紫外可见光谱（UV-Vis）、傅里叶红外光谱（FTIR）、透射电子显微镜（TEM）和x射线衍射（XRD）等分析技术研究了GHW-SeNPs和MP-SeNPs的特征结构。这些表征技术揭示了senp形成过程中植物结构中有机化合物的还原和稳定特性。GHW-SeNPs为多分散结构，平均直径为66.43 nm， MP-SeNPs为球形结构，尺寸较小，平均直径为23.86 nm。GHW-SeNPs的晶粒尺寸为57.74 nm， MP-SeNPs的晶粒尺寸为29.1 nm，非常纯净。红外光谱图显示，硒原子周围的有机化合物对硒的还原和纳米粒子的形成有显著的促进作用。检测了SeNPs对3种革兰氏阳性菌（金黄色葡萄球菌、枯草芽孢杆菌、巨芽孢杆菌）、4种革兰氏阴性菌（大肠杆菌、肺炎克雷伯菌、铜绿假单胞菌、产气肠杆菌）和3种真菌（白色念珠菌、脂解耶氏菌、酿酒酵母）的生物活性。随着浓度的增加，GHW-SeNPs对金黄色葡萄球菌和肺炎克雷伯菌的抑菌活性最好，抑菌带直径为25 mm。MP-SeNPs具有较强的抗真菌活性，对白色念珠菌具有较高的抑菌活性，抑菌带直径为24 mm。我们用环境友好的方法合成的MP-SeNP和GHW-SeNP颗粒的活性数据将有助于未来的药理学研究。

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引用次数: 0

Innovative materials for energy storage systems and photovoltaic solar technologies: A review 储能系统和光伏太阳能技术的创新材料：综述

IF 5.45 Q1 Physics and Astronomy

Nano-Structures & Nano-Objects

Pub Date : 2025-10-09 DOI: 10.1016/j.nanoso.2025.101562

Sana boutagount , Abdeslam El Fanaoui , Nadya Douihi , Bahcine Bakiz , Abdeljalil Benlhachemi , Aziz Taoufyq , Ahmed Ihlal

Energy production and storage systems are of prime importance for both scientific research and end-users, given the urgent need to reduce environmental and climatic impacts associated with conventional energy technologies. Energy storage plays a key role in managing the balance between supply and demand, while mitigating the intermittency of renewable energy sources. The development of these systems is therefore essential if we are to meet today’s energy challenges. With this in mind, advanced materials stand out as promising solutions for applications in solar cells and storage systems. These materials offer significant advantages, such as lower production costs and enhanced efficiency. Their abundance in Earth’s crust and their non-toxicity reinforce their relevance for sustainable and environmentally friendly solutions. This review provides a comprehensive analysis of solar cell technologies and the fundamentals of energy storage systems, with a particular focus on the convergence of materials engineering and storage strategies. Special attention is devoted to thin films, including two-dimensional transition metal dichalcogenides, metal oxides, and emerging alternative thin films, highlighting their roles in improving charge transport, stability, and overall device performance. The integration of these materials into alternative energy storage systems is also discussed, underscoring their capacity to combine high efficiency with environmental compatibility. The findings reveal both the opportunities and limitations of thin films in advancing solar energy conversion and energy storage. While remarkable progress has been achieved in terms of efficiency and stability, challenges such as large-scale integration, cost reduction, and long-term durability remain critical. Finally, the review emphasizes future directions, pointing to the need for multidisciplinary approaches and the exploration of novel material combinations to enable the next generation of sustainable energy systems.

鉴于迫切需要减少与传统能源技术相关的环境和气候影响，能源生产和储存系统对科学研究和最终用户都至关重要。能源储存在管理供需平衡方面发挥着关键作用，同时减轻了可再生能源的间歇性。因此，如果我们要应对当今的能源挑战，这些系统的发展是必不可少的。考虑到这一点，先进材料作为太阳能电池和存储系统应用的有前途的解决方案脱颖而出。这些材料具有显著的优势，如降低生产成本和提高效率。它们在地壳中的丰富和无毒使它们与可持续和环境友好的解决方案更加相关。本文对太阳能电池技术和储能系统的基本原理进行了全面的分析，特别关注了材料工程和储能策略的融合。特别关注薄膜，包括二维过渡金属二硫族化合物、金属氧化物和新兴的替代薄膜，强调它们在改善电荷传输、稳定性和整体器件性能方面的作用。还讨论了将这些材料集成到替代能源存储系统中，强调了它们将高效率与环境兼容性相结合的能力。这些发现揭示了薄膜在推进太阳能转换和储能方面的机遇和局限性。虽然在效率和稳定性方面取得了显著进展，但大规模集成、降低成本和长期耐用性等挑战仍然至关重要。最后，该综述强调了未来的方向，指出需要多学科方法和探索新的材料组合，以实现下一代可持续能源系统。

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引用次数: 0

High-performance gas sensors based on nanostructured metal oxide semiconductors: Materials engineering and sensing mechanisms 基于纳米结构金属氧化物半导体的高性能气体传感器：材料工程和传感机制

IF 5.45 Q1 Physics and Astronomy

Nano-Structures & Nano-Objects

Pub Date : 2025-10-07 DOI: 10.1016/j.nanoso.2025.101560

Nivishna R, Anilkumar P, Nisha Jenifar A

The rapid rise in industrialization and urbanization has significantly increased air pollution, posing serious risks to human health and the environment. Although various gas detection methods have been developed, they often suffer from high costs, complex operation, and limited suitability for real-time monitoring. To address these challenges, extensive research has focused on developing efficient environmental sensors, progressing from theoretical studies to practical applications. Among these, Metal Oxide Semiconductor (MOS)-based gas sensors have emerged as a promising option owing to their cost-effectiveness, high sensitivity, selectivity, and reliable performance. This review provides a comprehensive overview of recent advancements in gas sensor technology, with particular emphasis on synthesis techniques, morphological modifications, and the gas-sensing mechanisms of MOS materials. Furthermore, it highlights the critical relationship between material properties and sensor performance and discusses future research directions aimed at advancing MOS-based gas sensing technologies.

工业化和城市化的快速发展使空气污染显著加剧，对人类健康和环境构成严重威胁。尽管已经开发了各种气体检测方法，但它们往往存在成本高、操作复杂、实时监测适用性有限等问题。为了应对这些挑战，大量的研究集中在开发高效的环境传感器上，从理论研究到实际应用。其中，基于金属氧化物半导体（MOS）的气体传感器由于其成本效益、高灵敏度、选择性和可靠的性能而成为一种有前途的选择。本文综述了气体传感器技术的最新进展，重点介绍了MOS材料的合成技术、形态修饰和气敏机理。此外，它强调了材料性能与传感器性能之间的关键关系，并讨论了旨在推进基于mos的气体传感技术的未来研究方向。

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引用次数: 0

Ultrasound-assisted photocatalytic oxidation of isopropanol using Fe₂O₃ nanoparticles Fe₂O₃纳米颗粒超声辅助光催化氧化异丙醇

IF 5.45 Q1 Physics and Astronomy

Nano-Structures & Nano-Objects

Pub Date : 2025-10-06 DOI: 10.1016/j.nanoso.2025.101561

A.M. Dorgham, Rania Farouq

Photocatalytic alcohol decomposition is crucial for the preparation of valuable organics, and efficient treatment of isopropyl alcohol (IPA)-contaminated water is a priority in the semiconductor industry. In this study, Fe₂O₃ nanoparticles were developed as a photoactive, environmentally friendly catalyst for the oxidation of isopropanol to acetone. The catalyst demonstrated high efficiency in an oxidative process utilizing O₂ as the sole oxidant, without the need for additional surfactants or nitrogenous bases. The novelty of the process lies in the combination of sonolysis and photocatalysis, which enhances mass transfer and accelerates acetone production. Characterization of the Fe₂O₃ nanoparticles was conducted using X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Dynamic Light Scattering (DLS), Transmission Electron Microscopy (TEM), and Scanning Electron Microscopy (SEM). This approach provides a promising strategy for the rapid mineralization of isopropanol, offering potential applications in the semiconductor industry by reducing both processing time and costs.

光催化酒精分解对于制备有价值的有机物至关重要，有效处理异丙醇（IPA）污染的水是半导体工业的优先事项。在这项研究中，Fe2O3纳米颗粒被开发成一种光活性的、环境友好的催化剂，用于异丙醇氧化成丙酮。该催化剂在使用O2作为唯一氧化剂的氧化过程中表现出高效率，不需要额外的表面活性剂或含氮碱。该工艺的新颖之处在于声波分解和光催化相结合，增强了传质，加速了丙酮的生产。利用x射线衍射（XRD）、傅里叶变换红外光谱（FTIR）、动态光散射（DLS）、透射电子显微镜（TEM）和扫描电子显微镜（SEM）对Fe2O3纳米颗粒进行了表征。这种方法为异丙醇的快速矿化提供了一种有前途的策略，通过减少处理时间和成本，在半导体工业中提供了潜在的应用。

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引用次数: 0

Silver nanowires network for transparent electrode in dye-sensitized solar cell 染料敏化太阳能电池透明电极用银纳米线网络

IF 5.45 Q1 Physics and Astronomy

Nano-Structures & Nano-Objects

Pub Date : 2025-09-30 DOI: 10.1016/j.nanoso.2025.101559

Qamar Wali , Sidra Yousaf , Nahin Ar Rabbani , It Ee Lee

Silver nanowires (Ag NWs) network are promising alternatives to transparent conducting oxides and are being used as flexible transparent conducting electrodes in various optoelectronic devices. Indium tin oxide (ITO) deposited on a glass/polymer substrate mostly employs conducting electrodes in third-generation solar cells. This work has replaced expensive ITO with an inexpensive Ag NWs network deposited on glass substrate that acts as semi-transparent top electrode in dye-sensitized solar cell (DSSC). The synthesized electrodes show transparency in the range of 80–91 % and sheet resistance as low as 50 Ω cm⁻². The photovoltaic parameters of the fabricated DSSC are ∼0.54 V, 10.28 mA cm⁻², 3.38 % for open circuit voltage, short circuit current density, power conversion efficiency, respectively. The AgNWs based electrode shows promise as a cost effective transparent conducting electrode. It is a proof of concept that can be expanded to improve power conversion efficiency in futuristic devices.

银纳米线（Ag NWs）网络是透明导电氧化物的有前途的替代品，被用作各种光电器件的柔性透明导电电极。在第三代太阳能电池中，沉积在玻璃/聚合物衬底上的氧化铟锡（ITO）主要用于导电电极。这项工作用沉积在玻璃基板上的便宜的银纳米粒子网络取代了昂贵的ITO，作为染料敏化太阳能电池（DSSC）的半透明顶部电极。合成电极的透明度为80 - 91% %，片电阻低至50 Ω cm−2。制备的DSSC的光伏参数分别为~ 0.54 V, 10.28 mA cm−2,3.38 %，分别为开路电压，短路电流密度，功率转换效率。基于AgNWs的电极有望成为一种具有成本效益的透明导电电极。这是一个概念的证明，可以扩展到提高未来设备的功率转换效率。

引用次数: 0

Iron compounds from Euterpe oleracea Mart (açai) seed ash as electrocatalyst for oxygen evolution reaction 马蹄莲籽灰中铁化合物作为析氧反应的电催化剂

IF 5.45 Q1 Physics and Astronomy

Nano-Structures & Nano-Objects

Pub Date : 2025-09-27 DOI: 10.1016/j.nanoso.2025.101558

Marcondes L. da S. Azevedo , Evanimek B.S. da Silva , Jakeline R.D. dos Santos , Kelly C. Gomes , Júlio C. de O. Freitas , Carlos A. Martínez-Huitle , Marco A. Morales

The production of pulp from Euterpe oleracea Mart. palm fruits (açaí) generates a significant amount of primary solid waste, whose inadequate disposal poses environmental risks. The açaí seeds ash contains iron compounds and was used as an electrocatalyst in the oxygen evolution reaction (OER) process. The ashes were obtained by calcination of açaí seeds. The samples were characterized by several techniques, including XRF, XRD, TEM, FTIR, Mössbauer and magnetometry. The Mössbauer results revealed the presence of metal iron (α-Fe) and magnetite (Fe₃O₄). The electrochemical evaluation demonstrated that açaí seeds ash had promising catalytic activity for OER, exhibiting an overpotential of 349 mV at 10 mA cm⁻². The analysis of the Tafel curve indicated a superior electron transfer kinetics of 61 mV dec⁻¹, and the chronopotentiometry tests for 16 h showed electrochemical stability. The catalytic performance was attributed to the biochar composition, rich in iron in several oxidation states, which facilitates the charge transfer. These results suggested that açaí seed ash can be a valuable source for the development of efficient electrocatalysts for OER, contributing to the production of hydrogen and the circular economy.

马齿苋纸浆的生产。棕榈果（açaí）产生大量的初级固体废物，其处置不当造成环境风险。açaí种子灰分含有铁化合物，并被用作析氧反应（OER）过程中的电催化剂。灰烬是通过煅烧açaí种子获得的。采用XRF、XRD、TEM、FTIR、Mössbauer和磁强计等技术对样品进行了表征。Mössbauer结果显示，样品中存在金属铁（α-Fe）和磁铁矿（Fe3O4）。电化学评价表明açaí种子灰分对OER具有良好的催化活性，在10 mA cm−2下表现出349 mV的过电位。Tafel曲线分析表明，该材料具有61 mV dec−1的优异电子传递动力学，16 h的时间电位测试表明其具有电化学稳定性。生物炭在多种氧化态下富含铁元素，有利于电荷转移。这些结果表明，açaí种子灰可以成为开发高效OER电催化剂的宝贵资源，有助于氢气的生产和循环经济。

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引用次数: 0

Catalytic properties of Thuja occidentalis green synthesized Yb doped MgFe2O4, CuFe2O4 and MgCuFe2O4 ferrite nanoparticles 紫苏绿合成掺镱MgFe2O4、CuFe2O4和MgCuFe2O4铁氧体纳米颗粒的催化性能

IF 5.45 Q1 Physics and Astronomy

Nano-Structures & Nano-Objects

Pub Date : 2025-09-26 DOI: 10.1016/j.nanoso.2025.101554

Nisha Devi , Kuldeep Kumar , Ashwani Kumar , Naveen Thakur

The study explored the preparation of plant extract from Thuja occidentalis and the green synthesis of Ytterbium (Yb) doped ferrite nanoparticles, including MgFe₂O₄, CuFe₂O₄ and MgCuFe₂O₄. The plant extract was prepared by boiling fresh Thuja occidentalis leaves in distilled water and subsequently filtering the solution. The extract, abundant in phytochemicals such as flavonoids, tannins, and terpenoids, served as both a reducing and stabilizing agent in the precipitation-based synthesis of Yb doped ferrite nanoparticles. The molar ratios of the metals were maintained to achieve desired doping levels and NaOH was added to induce precipitation, which was then calcined to produce ferrite nanoparticles. The photocatalytic and antioxidant activities of the synthesized nanoparticles were evaluated using methylene blue (MB) dye degradation under visible light and DPPH radical scavenging assays, respectively. Characterization techniques, including XRD, FTIR, UV-Vis spectroscopy, XPS, SEM-EDS, TEM and VSM spectroscopy, confirmed the successful synthesis, structural integrity, functional and magnetic properties of the nanoparticles. The results revealed that Yb doped CuFe₂O₄ ferrites exhibited superior photocatalytic and antioxidant activities compared to the other ferrite nanoparticles, making them promising candidates for environmental and health-related applications.

本研究探索了西花植物提取物的制备及Yb掺杂铁氧体纳米粒子MgFe2O4、CuFe2O4和MgCuFe2O4的绿色合成。用蒸馏水将新鲜的西树叶煮沸，然后过滤得到植物提取物。该提取物富含黄酮类化合物、单宁和萜类化合物等植物化学物质，在沉淀法合成掺杂Yb的铁氧体纳米颗粒中充当还原剂和稳定剂。保持金属的摩尔比以达到所需的掺杂水平，并添加NaOH来诱导沉淀，然后煅烧生成铁酸盐纳米颗粒。利用可见光降解亚甲基蓝（MB）染料和清除DPPH自由基的实验，分别评价了合成的纳米颗粒的光催化活性和抗氧化活性。表征技术包括XRD、FTIR、UV-Vis光谱、XPS、SEM-EDS、TEM和VSM光谱，证实了纳米颗粒的成功合成、结构完整性、功能和磁性能。结果表明，与其他铁氧体纳米颗粒相比，Yb掺杂CuFe2O4铁氧体具有优越的光催化和抗氧化活性，使其成为环境和健康相关应用的有希望的候选材料。

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引用次数: 0

Using amber poly(ethylene terephthalate) waste to obtain carbon microneedles 利用琥珀聚对苯二甲酸乙酯废料制备碳微针

IF 5.45 Q1 Physics and Astronomy

Nano-Structures & Nano-Objects

Pub Date : 2025-09-26 DOI: 10.1016/j.nanoso.2025.101557

L.C. Chagüendo-Figueroa , D.F. Coral , G. Bolaños-Pantoja , J.E. Diosa , E. Mosquera-Vargas , J.E. Rodríguez-Páez

A plastic waste, amber poly(ethylene terephthalate) (PET), was used to obtain carbon microneedles, using iron oxide microparticles (IOMPs) that acted as nucleation points to favor the growth of the carbon structure. The IOMPs were synthesized using the precipitation method, in atmospheres of air and of nitrogen and characterized via X-ray diffraction (XRD), IR and EDAX spectroscopy, as well as scanning electron microscopy (SEM). The synthesized particles showed magnetite (Fe₃O₄) as their main crystalline phase, a submicron size and a morphology that varied depending on the atmosphere used: spheroidal and laminar, in air, and spherical, on using nitrogen. The amber PET was then placed on quartz substrates previously impregnated with IOMPs, to be subjected to a pyrolysis process at 700 °C. These carbon-based structures were found to have an acicular morphology, with a submicron width, and length in the micron range. These showed an elemental chemical composition of ∼ 95 % (wt%) C, ∼ 2.6 % (wt%) O, ∼ 2.4 % (wt%) Si and ∼ 0.4 % Fe, on average.

以塑料废料琥珀聚对苯二甲酸乙酯（PET）为原料，利用氧化铁微粒（IOMPs）作为成核点，促进碳结构的生长，制备了碳微针。采用沉淀法在空气和氮气气氛中合成了IOMPs，并通过x射线衍射（XRD）、红外光谱（IR）和EDAX光谱（EDAX）以及扫描电子显微镜（SEM）对其进行了表征。合成的颗粒以磁铁矿（Fe3O4）为主要晶相，尺寸为亚微米，形貌随所用气氛的不同而变化：在空气中呈球形和层流状，在使用氮气时呈球形。然后将琥珀PET放置在先前浸渍了IOMPs的石英衬底上，在700°C下进行热解过程。这些碳基结构具有针状形态，宽度为亚微米，长度在微米范围内。这些样品的元素化学组成平均为~ 95 % (wt%) C、~ 2.6 % (wt%) O、~ 2.4 % (wt%) Si和~ 0.4 % Fe。

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引用次数: 0