Journal of Sol-Gel Science and Technology最新文献_第8页

Synthesis and characterizations of SrMnO3 with rGO nanosheets (SMO-rGO) in energy-related applications 具有 rGO 纳米片（SMO-rGO）的 SrMnO3 在能源相关应用中的合成与表征

IF 2.3 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

Journal of Sol-Gel Science and Technology

Pub Date : 2024-10-14 DOI: 10.1007/s10971-024-06560-0

Mishkat Majeed, Abdelaziz Gassoumi, Saeed D. Khan, Khursheed Ahmad, Aman M. Aslam Hanaish

A crucial aspect of an oxygen evolution reaction is the improvement of electrocatalysts in an alkaline solution. Owing to their highly intrinsic activity and porous nature, perovskites (ABO₃) served as potential catalysts for OER. Transition-metal-oxides such as SrO₂, MnO₂, FeO, Co₃O₄ and NiO are considered potential catalysts for OER; strontium and manganese base oxides are efficient and have low cost. These catalysts have gained massive attention because of their structure, morphology and polyvalency. Herein, the crystalline perovskite SrMnO₃-rGO was fabricated using the hydrothermal method and analyzed using different physical and electrochemical characterizations. Different physical techniques were applied to study crystal structure, morphology and lattice vibration. The scanning electron microscopic analysis confirmed the homogeneous and small-sized structure of pristine SrMnO₃ and SrMnO₃-rGO composite. Moreover, composite showed a greater surface area (68 m² g⁻¹) according to the Brunauer Emmett Teller analysis. Then, the developed material was observed to determine stability, Tafel slope and overpotential. Further, the electrochemical characteristics of nickel foam (NF) are also analyzed which displays an overpotential of 378 mV and a Tafel value (80 mV dec⁻¹). In comparison, the prepared SrMnO₃-rGO composite showed an overpotential (198 mV) at standard current density (10 mA cm⁻²) and Tafel plot (37 mV dec⁻¹) with higher durability (30 hours) at 4000^th CV cycles. EIS was used to analyze the material’s resistance, which showed minimum R_ct (0.3 Ω) for composite. The present study expands perovskite-oxides with rGO performance as a catalyst, making it highly efficient for OER electrocatalysts. It can be applied at an industrial scale in the future.

Graphical Abstract

氧进化反应的一个重要方面是改进碱性溶液中的电催化剂。过氧化物（ABO3）具有很高的内在活性和多孔性，因此有可能成为氧还原反应的催化剂。SrO2、MnO2、FeO、Co3O4 和 NiO 等过渡金属氧化物被认为是潜在的 OER 催化剂；锶和锰基氧化物效率高、成本低。这些催化剂因其结构、形态和多价性而受到广泛关注。本文采用水热法制备了晶体包晶 SrMnO3-rGO，并利用不同的物理和电化学特性进行了分析。应用不同的物理技术研究了晶体结构、形貌和晶格振动。扫描电子显微镜分析证实，原始 SrMnO3 和 SrMnO3-rGO 复合材料的结构均匀且尺寸较小。此外，根据布鲁瑙尔-艾美特-特勒分析，复合材料显示出更大的表面积（68 m2 g-1）。然后，观察了所开发材料的稳定性、塔菲尔斜率和过电位。此外，还分析了泡沫镍（NF）的电化学特性，其过电位为 378 mV，Tafel 值为 80 mV dec-1。相比之下，制备的 SrMnO3-rGO 复合材料在标准电流密度（10 mA cm-2）和 Tafel 图（37 mV dec-1）条件下显示出 198 mV 的过电位，在 4000 次 CV 循环中具有更高的耐用性（30 小时）。EIS 用于分析材料的电阻，结果显示复合材料的 Rct（0.3 Ω）最小。本研究拓展了具有 rGO 性能的过氧化物作为催化剂的应用范围，使其成为高效的 OER 电催化剂。未来可将其应用于工业规模。

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引用次数: 0

Enhanced uniformity of zirconia coating for high power lasers via solvent replacement and PEG-doping 通过溶剂置换和 PEG 掺杂提高高功率激光用氧化锆涂层的均匀性

IF 2.3 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

Journal of Sol-Gel Science and Technology

Pub Date : 2024-10-14 DOI: 10.1007/s10971-024-06586-4

Wenjie Hu, Ce Zhang, Nini Li, Shengli Wu, Yao Xu

Zirconia coating has a lot of promise when it comes to enhancing the optical performance and laser-induced damage threshold (LIDT) of the mirror in laser systems. In this work, a high LIDT ZrO₂ coating was created using the sol-gel spin coating technique. The anhydrous ethanol solvent was substituted with alcohol ether solvent, and the spin coating technique was employed to achieve a macro homogeneous and flawless ZrO₂ coating. Additionally, organic polymer polyethylene glycol (average Mn 200, PEG200) doping was used to achieve the uniform ZrO₂ coating with LIDT. ZrO₂-PEG composite coatings with consistent LIDT and exceptional optical properties were created. Alcohol ether solvents helped the sol produce a more homogeneous gel coating on the substrate, as demonstrated by the ZrO₂ coating microscope pictures. The LIDT with a 0.5 wt.% PEG200 content was the most uniform. PEG200 organic molecules were able to alter the link state of the ZrO₂ particles. The macroscopic mechanical characteristics of the coatings revealed that the hardness and elastic modulus of the ZrO₂-PEG composite coating were mostly influenced by the PEG200 content. When the PEG200 content was 0.3 wt.%, the hardness and elastic modulus of the ZrO₂-PEG composite coating were the lowest with the highest of the LIDT at 39.25 ± 3.13 J/cm² (@ 1064 nm, 11 ns, 1 mm²).

Graphical Abstract

氧化锆涂层在提高激光系统反射镜的光学性能和激光诱发损伤阈值（LIDT）方面大有可为。在这项工作中，利用溶胶-凝胶旋涂技术制作了高 LIDT ZrO2 涂层。用醇醚溶剂代替了无水乙醇溶剂，并采用旋涂技术获得了宏观均匀无暇的 ZrO2 涂层。此外，有机聚合物聚乙二醇（平均锰含量为 200，PEG200）的掺杂被用于实现均匀的 ZrO2 涂层与 LIDT。最终制备出具有一致 LIDT 和优异光学性能的 ZrO2-PEG 复合涂层。正如 ZrO2 涂层显微镜图片所示，醇醚溶剂有助于溶胶在基底上形成更均匀的凝胶涂层。PEG200 含量为 0.5 wt.% 的 LIDT 最为均匀。PEG200 有机分子能够改变 ZrO2 颗粒的链接状态。涂层的宏观机械特性表明，ZrO2-PEG 复合涂层的硬度和弹性模量主要受 PEG200 含量的影响。当PEG200含量为0.3 wt.%时，ZrO2-PEG复合涂层的硬度和弹性模量最低，LIDT最高，为39.25 ± 3.13 J/cm2 (@ 1064 nm, 11 ns, 1 mm2)。

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引用次数: 0

Polyfluorene incorporation for superior performance and band gap reduction: enhancing Cs2AgBiBr6 double perovskite solar cells 掺入聚芴实现卓越性能并降低带隙：增强 Cs2AgBiBr6 双包晶太阳能电池的性能

IF 2.3 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

Journal of Sol-Gel Science and Technology

Pub Date : 2024-10-14 DOI: 10.1007/s10971-024-06582-8

Asad Ullah, Wasif ur Rehman, Muhammad Iftikhar Khan, N. S. Abd EL-Gawaad

Lead-free halide double perovskites (LFHDPs) based on Cs₂AgBiBr₆ are a good replacement for traditional lead-based LBPs due to their chemical stability and lack of toxicity. Double perovskite Cs₂AgBiBr₆-based solar cells have limited efficiency due to a large band gap, suggesting polyfluorene (PF) replacement as a workable solution to enhance their optical and photovoltaic characteristics. PF incorporation-induced crystal structural changes, as demonstrated by peak position shifts in X-ray diffraction. The UV–Vis spectroscopy, and solar simulator tests, were used to study the effect of PF on Cs₂AgBiBr₆. Optical examination reveals a decrease in E_g, leading to improved light absorption in the visible spectrum. By adding PF to their lattices, we effectively give the weakly luminous Cs₂AgBiBr₆ double perovskite robust red luminescence. The Cs₂Ag_0.95PF_0.05BiBr₆ solar cell has demonstrated a notable enhancement in performance. In that order, its enhanced fill factor, short-circuit current, and open-circuit voltage are 0.81, 5.73 mA cm⁻², and 0.93 V. Power conversion efficiency (PCE) has improved from 3.75% to 4.26%. About 13.60% of efficiency is increased by PF incorporation. The study identifies Cs₂Ag_0.95PF_0.05BiBr₆ as a high-performance material for solar applications and addresses issues with film formation. Our objective is to advance environmentally friendly solar technologies by enhancing efficiency, with future research focusing on interfacial engineering, specifically optimizing electron and hole transport layers.

Graphical Abstract

基于 Cs2AgBiBr6 的无铅卤化物双包晶（LFHDPs）具有化学稳定性和无毒性，是传统铅基 LBPs 的良好替代品。由于带隙较大，基于 Cs2AgBiBr6 的双包晶太阳能电池的效率有限，这表明聚芴 (PF) 替代是增强其光学和光伏特性的可行解决方案。正如 X 射线衍射中的峰位移动所证明的那样，PF 的加入引起了晶体结构的变化。紫外可见光谱和太阳能模拟器测试用于研究 PF 对 Cs2AgBiBr6 的影响。光学检查显示 Eg 值降低，从而改善了可见光谱的光吸收。通过在它们的晶格中添加 PF，我们有效地使弱发光的 Cs2AgBiBr6 双包晶石产生了强烈的红色发光。Cs2Ag0.95PF0.05BiBr6 太阳能电池的性能显著提高。其填充因子、短路电流和开路电压依次提高到 0.81、5.73 mA cm-2 和 0.93 V。功率转换效率（PCE）从 3.75% 提高到 4.26%。加入 PF 后，效率提高了约 13.60%。这项研究确定了 Cs2Ag0.95PF0.05BiBr6 作为太阳能应用的高性能材料，并解决了薄膜形成的问题。我们的目标是通过提高效率来推动环境友好型太阳能技术的发展，未来的研究重点是界面工程，特别是优化电子和空穴传输层。

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引用次数: 0

Efficient tetracycline removal from hospital wastewater using visible light active M-type lead hexaferrite/g-C3N4 composites 利用可见光活性 M 型六氟化铅/g-C3N4 复合材料高效去除医院废水中的四环素

IF 2.3 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

Journal of Sol-Gel Science and Technology

Pub Date : 2024-10-14 DOI: 10.1007/s10971-024-06590-8

Mudasir Mahmood, Shahid Iqbal, Muhammad Jamshaid, Ambreen Kalsoom, Amal M. Al-Mohaimeed, Rashid Iqbal, Firdous Bibi, Qasim Raza, Mohamed Soliman Elshikh

The hospital wastewater is major contributor to pharmaceutical contaminants, particularly antibiotic like tetracycline. Tetracycline is often found as a pollutant in water bodies, primarily due to its improper disposal and excretion through human and animal waste. This wastewater poses serious environmental and health risks. We synthesized a novel composite material M type lead hexaferrites/g-carbon nitride (PbFe₁₂O₁₉/g-C₃N₄) to address this alarming issue. The combine effect of lead hexaferrite with graphitic-C₃N₄, aiming to enhance the degradation of tetracycline (TC). The characterization of the synthesized composite was conducted using X-ray diffraction spectroscopy (XRD), Scanning electron microscope (SEM), Fourier transform infrared radiation spectroscopy (FTIR) and UV-Visible spectroscopy. The photocatalytic output of the samples was evaluated under sunlight irradiation. The results demonstrated superior removal efficiency of tetracycline up to 90% in only 60 min compared to individual components. This work highlights the potential of PbFe₁₂O₁₉/g-C₃N₄ composites as effective photocatalysts for treating pharmaceutical contaminants especially tetracycline in wastewater.

Graphical Abstract

医院废水是药物污染物的主要来源，尤其是四环素等抗生素。四环素经常作为污染物出现在水体中，这主要是由于其通过人类和动物排泄物的不当处置和排泄造成的。这种废水对环境和健康构成严重威胁。为了解决这一令人担忧的问题，我们合成了一种新型复合材料 M 型六价铁铅/氮化碳（PbFe12O19/g-C3N4）。六价铁铅与石墨化-C3N4的结合效应旨在增强四环素（TC）的降解。利用 X 射线衍射光谱（XRD）、扫描电子显微镜（SEM）、傅立叶变换红外光谱（FTIR）和紫外-可见光谱对合成的复合材料进行了表征。在阳光照射下，对样品的光催化输出进行了评估。结果表明，与单个成分相比，仅在 60 分钟内四环素的去除率就高达 90%。这项工作凸显了 PbFe12O19/g-C3N4 复合材料作为有效光催化剂处理制药污染物（尤其是废水中的四环素）的潜力。

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引用次数: 0

Novel molybdenum sulfide-decorated graphitic carbon nitride nanohybrid for enhanced electrochemical oxygen evolution reaction 用于增强电化学氧进化反应的新型硫化钼装饰氮化石墨碳纳米杂化物

IF 2.3 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

Journal of Sol-Gel Science and Technology

Pub Date : 2024-10-14 DOI: 10.1007/s10971-024-06561-z

Arooj Fatima, Albandari W. Alrowaily, Haifa A. Alyousef, B. M. Alotaibi, A. Dahshan

Transition metal chalcogenides are potentially better than electrocatalysts for the OER electrolysis that contain rare earth metals. Still, they have not yet developed to a catalytic performance level that would enable widespread adoption. To attain high-efficiency OER, it is imperative to create logical designs for electrocatalysts based upon transition metals on showing polymer substrate. Here, we discuss the sonication fabrication and extraordinary catalytic activity of MoS₂/g-CN in alkaline media as an OER electrocatalyst. Various techniques like X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) and scanning electron microscopy (SEM) are employed to evaluate the structure, surface characteristics and morphology. Conversely, the MoS₂/g-CN electrode’s higher specific SA, outstanding conductivity and very porous framework in 1 M alkaline KOH led to superior OER campaign (overpotential 203 mV with Tafel slope 36 mV/dec). It showed increased OER activity by maintaining high stability for about 35 h. Our results suggest that graphitic carbon nitride can produce steady and sustainable energy and that transition metal chalcogenides with specific morphologies can improve electrocatalytic efficacy. Because of the distinct crystal phase-linked electrical properties, this discovery provides a fresh perspective for potential applications.

Graphical Abstract

与含有稀土金属的 OER 电解电催化剂相比，过渡金属钙化物具有更好的潜力。不过，它们的催化性能尚未发展到可以广泛采用的水平。要实现高效的 OER，必须在显示聚合物基底的过渡金属基础上设计出合理的电催化剂。在此，我们讨论了在碱性介质中作为 OER 电催化剂的 MoS2/g-CN 的超声制造和非凡催化活性。我们采用了 X 射线衍射 (XRD)、Brunauer-Emmett-Teller (BET) 和扫描电子显微镜 (SEM) 等多种技术来评估其结构、表面特征和形态。相反，MoS2/g-CN 电极在 1 M 碱性 KOH 溶液中具有更高的比表面积、出色的导电性和多孔框架，因而具有出色的 OER 活性（过电位 203 mV，Tafel 斜率 36 mV/dec）。我们的研究结果表明，氮化石墨碳可以产生稳定、可持续的能量，而具有特定形态的过渡金属卤化物可以提高电催化活性。由于其独特的晶体相联电学特性，这一发现为其潜在应用提供了一个全新的视角。

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引用次数: 0

“Tuning density and morphology of organic-inorganic hybrid-silica aerogels through precursor dilution for lightweight applications” "通过前驱体稀释调节有机-无机杂化二氧化硅气凝胶的密度和形态，实现轻质应用"

IF 2.3 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

Journal of Sol-Gel Science and Technology

Pub Date : 2024-10-11 DOI: 10.1007/s10971-024-06572-w

K. Steffens, D. Bialuschewski, B. Milow

Organic-inorganic hybrid-silica aerogels can be made of methyltrimethoxysilane (MTMS, CH₃Si(OCH₃)₃) and dimethyldimethoxysilane (DMDMS, Si(OCH₃)₂(CH₃)₂) in a typical sol-gel process yielding flexible and hydrophobic structures. In this work, MTMS and DMDMS were condensed with an increasing amount of water, leading to a decrease in the final materials density from ∼ 0.110 g cm⁻³ down to ∼0.066 g cm⁻³. The gels were synthesized in a one-pot synthesis and dried under ambient pressure conditions at 80 °C. While the topology of the network remained intact, the size of secondary particles decreased from roughly 8.2 to 3.3 μm. The inter-particle neck thickness remained unaffected with increasing aging time for higher dilutions. The measured thermal conductivities were all in similar range (∼ 32.5 mW (m K)⁻¹ at 25 °C), showing very good insulation characteristics. In general, higher diluted samples exhibited increasing softness and decreasing Young’s modulus, even with increased aging times. Overall, our optimized recipe leads to hydrophobic aerogels with ultralow densities while demonstrating very low thermal conductivity and a flexible mechanical performance.

Graphical Abstract

有机-无机混合二氧化硅气凝胶可由甲基三甲氧基硅烷（MTMS，CH3Si(OCH3)3）和二甲基二甲氧基硅烷（DMDMS，Si(OCH3)2(CH3)2）通过典型的溶胶-凝胶工艺制成，具有柔性和疏水性结构。在这项工作中，MTMS 和 DMDMS 与越来越多的水发生了凝结，导致最终材料密度从 ∼ 0.110 g cm-3 降低到 ∼ 0.066 g cm-3。凝胶是通过一锅合成法合成的，并在 80 °C 的常压条件下干燥。虽然网络的拓扑结构保持不变，但次级粒子的尺寸从大约 8.2 μm 减小到 3.3 μm。对于较高的稀释度，随着老化时间的延长，颗粒间的颈部厚度保持不变。测得的热导率都在相似的范围内（25 °C时为 32.5 mW (m K)-1），显示出非常好的绝缘特性。一般来说，稀释度越高的样品软度越大，杨氏模量越小，即使老化时间延长也是如此。总之，我们的优化配方可制成密度超低的疏水气凝胶，同时具有极低的热导率和灵活的机械性能。

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引用次数: 0

Up-conversion materials for solid-state lighting 固态照明用上转换材料

IF 2.3 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

Journal of Sol-Gel Science and Technology

Pub Date : 2024-10-09 DOI: 10.1007/s10971-024-06577-5

Rui M. Almeida, E. Alves, Luís F. Santos

Conventional phosphor-converted white LEDs (WLEDs), using (Stokes) down-conversion light emission, suffer from a red deficiency that increases the Color Temperature towards “cool white light” above 5000 K. The present work describes a phosphor-Up-converted WLED approach that wishes to overcome this issue by achieving white light generation (WLG) through Up-conversion photoluminescence (UCPL), without energy losses due to Stokes shift and excited by a 980 nm LED instead of the more expensive blue LEDs. The UC materials include thin films of lanthanide (Ln)-doped aluminosilicate glass multilayers, alternating (Ln)-doped aluminosilicate and titania films in the form of 1-D photonic crystals and Ln ion-implanted materials. Sol-gel (SG) processing has been used as a low-cost high purity processing method to prepare titania, as well as aluminosilicate films containing Er³⁺, Tm³⁺ and Yb³⁺, for WLG and possible application as WLED materials. The total Ln content varied from a high of 22 mol% to as low as 5.8 mol%. The materials prepared have been characterized by UV-Vis-NIR (using a variable angle specular reflection accessory), plus FTIR and UCPL spectroscopies. The UC light emission was analyzed with the help of CIE chromaticity diagrams.

Graphical abstract

Left: UC spectra of bulk aluminosilicate glass with 84.2 SiO₂–10 AlO_1.5–0.3 Tm–0.5 Er–5 Yb, excited at different 980 nm laser power levels. Right: UC spectra of a 84 SiO₂–10 AlO_1.5–0.5 Tm–0.5 Er–5 Yb microcavity excited with 5 W of 980 nm laser power, collected at 10° off-normal (solid black line), together with a reference film with the same number of aluminosilicate glass layers and dopant concentrations (dotted red line).

传统的磷转换白光led (wled)，使用（斯托克斯）下转换光发射，遭受红色缺陷，增加色温向“冷白光”5000 K以上。目前的工作描述了一种磷上转换WLED方法，该方法希望通过上转换光致发光（UCPL）实现白光产生（WLG）来克服这一问题，该方法没有由于斯托克斯位移而造成的能量损失，并且由980 nm LED而不是更昂贵的蓝色LED激发。UC材料包括镧系元素（Ln）掺杂的铝硅酸盐玻璃多层薄膜、以一维光子晶体形式交替掺杂（Ln）的铝硅酸盐和二氧化钛薄膜以及Ln离子注入材料。溶胶-凝胶（SG）工艺是一种低成本、高纯度的加工方法，用于制备二氧化钛，以及含有Er3+、Tm3+和Yb3+的铝硅酸盐薄膜，用于WLG，并可能应用于WLED材料。总Ln含量从22摩尔%到5.8摩尔%不等。所制备的材料已通过UV-Vis-NIR（使用可变角度镜面反射附件），以及FTIR和UCPL光谱进行了表征。利用CIE色度图对UC光发射进行了分析。左图：在不同980 nm激光功率下，84.2 SiO2-10 AlO1.5-0.3 Tm-0.5 Er-5 Yb的块状铝硅酸盐玻璃的UC光谱。右图：以5w 980 nm激光功率激发的84 SiO2-10 AlO1.5-0.5 Tm-0.5 Er-5 Yb微腔的UC光谱（黑色实线），与具有相同铝硅酸玻璃层数和掺杂浓度的参考膜（红色虚线）。

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引用次数: 0

Valorizing shrimp shell chitosan: a versatile biomaterial for fabricating effective antibacterial and antioxidant silver nanoparticles 利用虾壳壳聚糖：制造有效抗菌和抗氧化银纳米粒子的多功能生物材料

IF 2.3 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

Journal of Sol-Gel Science and Technology

Pub Date : 2024-10-07 DOI: 10.1007/s10971-024-06578-4

Abdelatif Aouadi, Djamila Hamada Saoud, Abdelkrim Rebiai, Salah Eddine Laouini, Abdelhak Achouri, Abdelmalek Zaater, Fahad Alharthi, Abderrhmane Bouafia, Hamdi Ali Mohammed, Gamil Gamal Hasan, Johar Amin Ahmed Abdullah

A study was conducted to explore the potential of using chitosan (CS) derived from shrimp shells, a bioorganic waste product, as a reducing and capping agent in the synthesis of silver nanocomposites (Cs-Ag NC). The objective of the study was to develop a simpler, faster, and more environmentally friendly method for producing Cs-Ag NC. The synthesized Cs-Ag NC was characterized using UV-Vis spectroscopy, X-ray diffraction spectroscopy, Fourier transform infrared spectroscopy, and scanning electron microscopy. The findings revealed that the Cs-Ag NC exhibited a crystalline structure, was coated with CS components, and had a spherical shape with an average diameter of approximately 20 nm. Under optimal conditions, the synthesized Cs-Ag NC demonstrated significant free radical scavenging activity against 2-diphenyl-1-picrylhydrazyl (DPPH) with an IC50 value of 1.65 mg/mL, substantial free radical scavenging activity against 2,2’-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) with an IC50 value of 2.8 mg/mL, and notable anti-inflammatory activity. Additionally, the Cs-Ag NC exhibited significant antibacterial activity against several pathogenic strains, including Pseudomonas aeruginosa, Escherichia coli, and Staphylococcus aureus. Based on these findings, the synthesized Cs-Ag NC possess promising potential as therapeutic drugs for antioxidant and antibacterial applications.

Graphical Abstract

本研究旨在探索使用从虾壳中提取的壳聚糖（CS）（一种生物有机废物）作为还原剂和封端剂合成银纳米复合材料（Cs-Ag NC）的潜力。这项研究的目的是开发一种更简单、更快速、更环保的方法来生产铯银纳米复合材料。使用紫外可见光谱、X 射线衍射光谱、傅立叶变换红外光谱和扫描电子显微镜对合成的铯银纳米复合材料进行了表征。研究结果表明，铯银 NC 具有晶体结构，表面包覆有 CS 成分，呈球形，平均直径约为 20 纳米。在最佳条件下，合成的 Cs-Ag NC 对 2-二苯基-1-苦基肼（DPPH）具有显著的自由基清除活性（IC50 值为 1.65 mg/mL），对 2,2'-偶氮-双（3-乙基苯并噻唑啉-6-磺酸）（ABTS）具有显著的自由基清除活性（IC50 值为 2.8 mg/mL），并具有明显的抗炎活性。此外，Cs-Ag NC 对包括绿脓杆菌、大肠杆菌和金黄色葡萄球菌在内的几种致病菌株具有显著的抗菌活性。基于这些发现，合成的铯银 NC 具有作为抗氧化和抗菌治疗药物的巨大潜力。

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引用次数: 0

Facile sol-gel synthesis of ZnAl2O4 spinel nanoceramics for photocatalytic applications: H2 production and MB dye degradation 光催化用ZnAl2O4尖晶石纳米陶瓷的溶胶-凝胶合成：制氢和MB染料降解

IF 2.3 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

Journal of Sol-Gel Science and Technology

Pub Date : 2024-10-05 DOI: 10.1007/s10971-024-06575-7

E. Ávalos-Marrón, L. A. Diaz-Torres, C. Gómez-Solís, A. Torres-Castro, R. A. Rodríguez-Rojas, P. García-Ramírez

ZnAl₂O₄ spinel nanoceramic was successfully synthesized by a sol-gel combustion method and subsequent annealing at temperatures as low as 500 °C. The photocatalytic activity of the synthesized spinels was evaluated for the H₂ photocatalytic production and photodegradation of methylene blue dye (MB) under UV light irradiation. ZnAl₂O₄ spinels were characterized by X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), Fourier Transform Infrared (FTIR), UV-vis spectroscopy, and Photoluminescence (PL). XRD revealed that the low-temperature calcination ZnAl₂O₄ spinel nanoceramics have a cubic crystalline structure and nanocrystallites sizes between 10–21 nm. The presence of carbon dot (CDs) nanoparticles is suggested by FTIR, UV-vis, and EDS characterization. Band gap values, estimated from diffuse reflectance spectra, are between 2.00 eV and 4.26 eV, for ZnAl₂O₄ calcined between 500 °C and 900 °C. The best H₂ evolution was achieved with ZnAl₂O₄ treated at 500 °C reaching a 145 μmol g⁻¹ production after 2 h. The highest percentage of MB dye degradation of 84%, after 120 min of UV irradiation, was achieved with ZnAl₂O₄ spinel treated at 900 °C.

采用溶胶-凝胶燃烧法制备了ZnAl2O4尖晶石纳米陶瓷，并在500℃的低温下进行了退火。考察了合成尖晶石在紫外光照射下对亚甲基蓝染料（MB）的光催化活性。采用x射线衍射（XRD）、扫描电镜（SEM）、傅里叶变换红外（FTIR）、紫外可见光谱（UV-vis）、光致发光（PL）等方法对ZnAl2O4尖晶石进行了表征。XRD分析表明，低温煅烧ZnAl2O4尖晶石纳米陶瓷具有立方晶体结构，纳米晶粒尺寸在10 ~ 21 nm之间。FTIR， UV-vis和EDS表征表明碳点（CDs）纳米颗粒的存在。从漫反射光谱估计，在500°C和900°C之间煅烧的ZnAl2O4带隙值在2.00 ~ 4.26 eV之间。ZnAl2O4在500℃下处理2 h，产氢量达到145 μmol g−1。900°C处理的ZnAl2O4尖晶石在紫外线照射120 min后，MB染料的降解率最高，达到84%。

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引用次数: 0

“Sol-gel auto combustion synthesis of Al3+-Gd3+ ions co-doped cobalt ferrite nanoparticles for nanoelectronics applications” "用于纳米电子应用的 Al3+-Gd3+ 离子共掺杂钴铁氧体纳米粒子的溶胶-凝胶自燃合成"

IF 2.3 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

Journal of Sol-Gel Science and Technology

Pub Date : 2024-10-05 DOI: 10.1007/s10971-024-06571-x

Vaibhav K. Raut, Sandeep B. Somvanshi, Elmuez A. Dawi, Chandrakant T. Birajdar

This study focused on investigating cobalt ferrite nanoparticles doped with trivalent Al³⁺ and Gd³⁺ ions across compositions ranging from CoFe_2-2xAl_xGd_xO₄ (x = 0.00, 0.02, 0.04, 0.06, 0.08). The nanoparticles were synthesized using the sol-gel auto-ignition method with citric acid as a chelating agent. Structural analysis via Rietveld-refined X-ray diffraction confirmed the formation of single-phase nanoparticles with a cubic spinel structure. Morphological examination through scanning electron microscopy revealed spherical-shaped grains. Elemental analysis using energy-dispersive X-ray analysis indicated consistent composition and high purity. Infrared spectra analysis verified the presence of characteristic modes typical of spinel ferrite structures. Magnetic properties assessed by vibrating sample magnetometry demonstrated soft magnetic behavior with lower coercivity. DC electrical resistivity measurements indicated a decrease in resistivity with increasing Al³⁺-Gd³⁺ co-doping, while dielectric studies showed enhanced properties in this regard. Overall, the findings suggest that these co-doped cobalt ferrite nanoparticles hold promise for applications in magneto-electronic devices.

Graphical Abstract

本研究重点研究了掺杂三价 Al3+ 和 Gd3+ 离子的钴铁氧体纳米粒子，其组成范围为 CoFe2-2xAlxGdxO4 (x = 0.00, 0.02, 0.04, 0.06, 0.08)。这些纳米粒子是以柠檬酸为螯合剂，采用溶胶-凝胶自燃法合成的。通过 Rietveld-refined X 射线衍射进行的结构分析证实，单相纳米粒子的形成具有立方尖晶石结构。通过扫描电子显微镜进行的形态学检查发现了球形颗粒。利用能量色散 X 射线分析法进行的元素分析表明，该物质成分一致，纯度很高。红外光谱分析证实了尖晶石铁氧体结构的典型特征模式。通过振动样品磁力计评估的磁性能表明，该材料具有较低矫顽力的软磁特性。直流电阻率测量结果表明，随着 Al3+-Gd3+ 共掺量的增加，电阻率有所下降，而介电研究则显示这方面的特性有所增强。总之，研究结果表明，这些共掺杂钴铁氧体纳米粒子有望应用于磁电子器件。

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引用次数: 0