FlatChem最新文献_第5页

A high-performance boron nitride nanocomposite coating with enhanced anticorrosion and flame retardant properties for aerospace applications 具有更强防腐和阻燃性能的高性能氮化硼纳米复合涂层，可用于航空航天领域

IF 5.9 3区材料科学 Q2 CHEMISTRY, PHYSICAL

FlatChem

Pub Date : 2024-11-01 DOI: 10.1016/j.flatc.2024.100771

S.P. Vinodhini , Joseph Raj Xavier , R. Ganesan

The efficiency of impermeable, two-dimensional material-infused nanocomposites in preventing metal corrosion is becoming more widely acknowledged. The remarkable chemical and thermal durability of 3-(2-aminomethylamino)butyltrimethoxysilane (AMBMS)-functionalized hexagonal boron nitride (BN) sets it apart from others. This study looks into adding more graphitic carbon nitride (GCN) and functionalized BN to the polymer to make it more resistant to corrosion and fire. Electrochemical methods were used on aluminum substrates to evaluate the performance of the proposed polyurethane (PU)/functionalized BN/GCN coating in a 3.5 wt% NaCl solution. After 800 h of exposure, Electrochemical Impedance Spectroscopy (EIS) indicated a coating resistance of 1.15 × 10⁹ Ω.cm², indicating significant increases in corrosion resistance. The protection efficiency of the composite coating was calculated to be 99.9 %. Furthermore, the coating exhibited an angle of contact with water of 163°, indicating its exceptional water repellency. The PU/functionalized BN/GCN composite had a much lower peak heat release rate than pure PU, which means it is better at keeping flames from spreading. These enhancements contribute to improved safety in potential applications. This durability is particularly important for aerospace applications, where long-term performance is critical. In short, the addition of functionalized BN/GCN to PU coatings significantly enhances the material’s mechanical, flame retardant, and corrosion resistance qualities, making it ideal for use in harsh environments such as aerospace.

不透水的二维材料注入纳米复合材料在防止金属腐蚀方面的功效正得到越来越广泛的认可。3-(2-氨基甲基氨基)丁基三甲氧基硅烷（AMBMS）功能化六方氮化硼（BN）具有卓越的化学和热耐久性，使其与众不同。本研究探讨在聚合物中添加更多石墨氮化碳（GCN）和功能化 BN，使其更耐腐蚀和防火。研究人员在铝基材上使用电化学方法评估了在 3.5 wt% 的氯化钠溶液中拟议的聚氨酯 (PU) / 功能化 BN/GCN 涂层的性能。暴露 800 小时后，电化学阻抗谱（EIS）显示涂层电阻为 1.15 × 109 Ω.cm2，表明耐腐蚀性显著提高。经计算，复合涂层的保护效率为 99.9%。此外，涂层与水的接触角为 163°，表明其具有优异的憎水性。聚氨酯/功能化 BN/GCN 复合材料的峰值热释放率远远低于纯聚氨酯，这意味着它能更好地防止火焰蔓延。这些改进有助于提高潜在应用的安全性。这种耐久性对于航空航天应用尤为重要，因为在这些应用中，长期性能至关重要。简而言之，在聚氨酯涂层中添加功能化 BN/GCN 可显著提高材料的机械、阻燃和耐腐蚀性能，使其成为在航空航天等恶劣环境中使用的理想材料。

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引用次数: 0

Nanostructured nickel doped manganese oxide/polypyrrole/graphitic carbon nitride hydrogel as high-performance supercapacitor electrodes 作为高性能超级电容器电极的纳米结构掺杂镍氧化锰/聚吡咯/石墨化氮化碳水凝胶

IF 5.9 3区材料科学 Q2 CHEMISTRY, PHYSICAL

FlatChem

Pub Date : 2024-11-01 DOI: 10.1016/j.flatc.2024.100778

Priya Siwach , Latisha Gaba , Kanika Aggarwal , Sajjan Dahiya , Rajesh Punia , A.S. Maan , Kuldeep Singh , Yedluri Anil Kumar , Ayman A. Ghfar , Anil Ohlan

Polypyrrole hydrogel (PH) attributing high electrical conductivity, intriguing redox properties, ease of synthesis and environmental friendliness, is a prospective electrode material for supercapacitors (SCs). This work presented details of the synthesis of pH and its binary and ternary nanocomposites. The ternary nanocomposite PPy-GCN-NMO (PGNMO), synthesized via in-situ oxidative polymerization, demonstrates an exclusive combination of morphologies, leading to excellent supercapacitive performance. The strategically chosen synergy of electric double-layer capacitance (EDLC) and pseudocapacitive materials helps in overcoming the limitation of individual elements and collectively accounts for excellent supercapacitive performance. Electrochemical studies of PGNMO electrode provides an excellent specific capacitance (C_s) of 3611 F/g at 1 A/g. Moreover, the fabricated symmetric device of PGNMO exhibits impressive C_s of 588 F/g at 1 A/g, and exceptional cycle stability with 104.3 % retention after 6000 cycles. Additionally, the device delivers appreciable specific energy of 40.1 Wh/kg at 1587.6 W/kg, positioning PGNMO to the forefront of flexible electrodes for SCs.

聚吡咯水凝胶（Polypyrrole hydrogel，PH）具有导电性高、氧化还原性强、易于合成和环境友好等特点，是超级电容器（SC）的一种前景广阔的电极材料。本研究详细介绍了 pH 及其二元和三元纳米复合材料的合成。通过原位氧化聚合合成的三元纳米复合材料PPy-GCN-NMO（PGNMO）展现了独特的形态组合，具有优异的超级电容器性能。战略性地选择双电层电容（EDLC）和伪电容材料的协同作用有助于克服单个元素的局限性，共同实现优异的超级电容性能。对 PGNMO 电极的电化学研究表明，在 1 A/g 的条件下，该电极具有 3611 F/g 的出色比电容 (Cs)。此外，PGNMO 制成的对称器件在 1 A/g 时显示出令人印象深刻的 588 F/g Cs，并且具有优异的循环稳定性，在 6000 次循环后仍能保持 104.3%。此外，该器件在 1587.6 W/kg 时可提供 40.1 Wh/kg 的可观比能量，使 PGNMO 成为用于 SC 的柔性电极的领先产品。

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引用次数: 0

Co-use of laser texturing and graphene synthesis 激光制绒和石墨烯合成的联合使用

IF 5.9 3区材料科学 Q2 CHEMISTRY, PHYSICAL

FlatChem

Pub Date : 2024-11-01 DOI: 10.1016/j.flatc.2024.100770

S.Y. Misyura , V.S. Morozov , V.A. Andryuschenko , K.V. Slyusarskiy

The article is devoted to the study of wettability on combined textured surfaces (laser texturing): textured copper and graphene (Cu/G) synthesized on copper. For the first time the combined effect of various textures after laser texturing and graphene synthesis on corrosion current and wettability before and after corrosion is investigated. Previous research works have shown that the surface wettability after laser texturing varies greatly over time, from superhydrophilic to highly hydrophobic. However, the present work shows that the combined effect of laser texturing and graphene synthesis allows stabilizing the wettability of textured samples over time, as well as significantly reducing the impact of corrosion on the contact angle. The droplet contact angle changes slightly over time after corrosion. The smallest change in the contact angle corresponds to the Cu/G surface for textures with craters. At that, the corrosion current of the textured Cu/G sample is reduced 12–14 times, compared with the textured copper. The use of textures with craters provides higher corrosion resistance than in the case of textures without craters. The performed XPS analysis reveals that that the textured wall with craters has a maximum peak C = C (C1s XPS spectra). A new mechanism is proposed to explain the different wettability inversion period for textured copper with graphene synthesis. The wettability of textured surfaces is simulated using molecular dynamics methods. The contact angle of the nanodrop depends on both the textures and the hydrophilicity of the polished surface. The obtained results will be useful for the development of combined methods and composite materials in materials science to control wettability, stabilize surface properties, as well as to counteract aggressive environmental effects.

文章专门研究了组合纹理表面（激光纹理）的润湿性：纹理铜和在铜上合成的石墨烯（Cu/G）。文章首次研究了激光纹理和石墨烯合成后的各种纹理对腐蚀前后的腐蚀电流和润湿性的综合影响。以往的研究表明，激光纹理后的表面润湿性随时间变化很大，从超亲水到高度疏水。然而，本研究表明，激光制绒和石墨烯合成的共同作用可以使制绒样品的润湿性随着时间的推移而趋于稳定，并显著降低腐蚀对接触角的影响。腐蚀后，液滴接触角会随时间发生轻微变化。对于带有凹坑的纹理，接触角变化最小的是 Cu/G 表面。此时，与纹理铜相比，纹理 Cu/G 样品的腐蚀电流降低了 12-14 倍。与无凹坑的纹理相比，使用带凹坑的纹理具有更高的耐腐蚀性。所进行的 XPS 分析表明，带有凹坑的纹理壁具有最大峰值 C = C（C1s XPS 光谱）。我们提出了一种新的机制来解释石墨烯合成纹理铜的不同润湿性反转周期。使用分子动力学方法模拟了纹理表面的润湿性。纳米滴的接触角取决于抛光表面的纹理和亲水性。所获得的结果将有助于在材料科学领域开发组合方法和复合材料，以控制润湿性、稳定表面特性以及抵御侵蚀性环境影响。

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引用次数: 0

The adsorption and gas-sensing properties of transition metal (Ag and Au) modified CrS2 monolayer: A DFT study 过渡金属（Ag 和 Au）修饰 CrS2 单层的吸附和气体传感特性：DFT 研究

IF 5.9 3区材料科学 Q2 CHEMISTRY, PHYSICAL

FlatChem

Pub Date : 2024-11-01 DOI: 10.1016/j.flatc.2024.100780

Di Zhang , Wenyuan Zhu , Hongbin Li , Long Lin , Kun Xie , Pengtao Wang , Zhanying Zhang

Real-time monitoring of gases from thermal runaway in lithium batteries is a method to improve their safety. In this paper, the adsorption of lithium battery thermal runaway gases on a monolayer of CrS₂ is analyzed using first principle calculations. The adsorption energy, energy bands, density of states, charge transfer, and recovery time of the adsorption structure between the designated gas and Ag and Au-loaded CrS₂ are investigated. After comparing the adsorption parameters, the ability of the target gas to be adsorbed is significantly enhanced after doping with transition metals. In terms of sensing performance, the modification effects of Ag and Au on the substrate have also been verified through state density and recovery time. This study offers a theoretical basis for the development of a novel gas sensor to detect gases produced during thermal runaway in lithium batteries.

实时监测锂电池热失控产生的气体是提高其安全性的一种方法。本文利用第一原理计算分析了锂电池热失控气体在 CrS2 单层上的吸附情况。研究了指定气体与 Ag 和 Au 负载 CrS2 之间吸附结构的吸附能、能带、态密度、电荷转移和恢复时间。比较吸附参数后发现，掺杂过渡金属后，目标气体的吸附能力明显增强。在传感性能方面，Ag 和 Au 对基底的修饰作用也通过状态密度和恢复时间得到了验证。这项研究为开发新型气体传感器提供了理论依据，该传感器可检测锂电池热失控过程中产生的气体。

引用次数: 0

Surface functionalization of WS2 nanosheets with Poly(N-vinylcaprolactam) and vinylacetic acid for targeted drug release in prostate cancer 聚（N-乙烯基己内酰胺）和乙烯基乙酸对 WS2 纳米片的表面功能化，用于前列腺癌的靶向药物释放

IF 5.9 3区材料科学 Q2 CHEMISTRY, PHYSICAL

FlatChem

Pub Date : 2024-11-01 DOI: 10.1016/j.flatc.2024.100777

Mohammadreza Mahdavijalal , Homayon Ahmad Panahi , Elham Moniri , Niloufar Torabi Fard

Stimuli-responsive nanocarriers have gained attention in cancer therapy as a promising strategy because of their ability to enhance treatment efficacy and minimize off-target medication effects. This study introduces a novel nanopolymer responsive to pH and near-infrared (NIR) light as an intelligent carrier for delivering bicalutamide (BCT) into cancer cells. For this, the surface of tungsten disulfide (WS₂) nanosheets is modified with temperature-responsive (poly(N-vinylcaprolactam)) and pH-sensitive (vinylacetic acid) polymers and then characterized using TGA, FE-SEM, XRD, and FT-IR techniques. Experimental variables including pH (5.56), temperature (25 °C), and contact time (11.02 min) are optimized using response surface methodology (RSM) and central composite design (CCD), yielding an adsorption efficacy of 99.45 %. The RSM-CCD model’s capability is analyzed using the correlation coefficient (R2) and several statistical error functions, including average relative error (ARE), root mean square error (RMSE), hybrid fractional error function (HYBRID), and Chi-square test (χ2). The in vitro drug release procedure is evaluated at different pH levels (5.6 and 7.4) and temperatures (37 and 50 °C). The results showed a maximum BCT release of 87.2 % within 6 h at 50 °C and pH 5.6, compared to 13.3 % at 37 °C and pH 7.4. Moreover, the BCT-loaded carrier demonstrates complete BCT release (100 %) following 10 min of NIR irradiation at pH 5.6. The kinetic data confirm that the best fit belongs to the zero-order model, and the drug release followed the supercase II transport mechanism.

刺激响应型纳米载体能够提高治疗效果并最大限度地减少药物的脱靶效应，因此作为一种有前途的策略在癌症治疗领域备受关注。本研究介绍了一种对 pH 值和近红外（NIR）光敏感的新型纳米聚合物，作为一种智能载体将比卡鲁胺（BCT）输送到癌细胞中。为此，在二硫化钨（WS2）纳米片表面改性了温度响应型（聚 N-乙烯基己内酰胺）和 pH 值敏感型（乙烯基乙酸）聚合物，然后使用 TGA、FE-SEM、XRD 和 FT-IR 技术对其进行了表征。实验变量包括 pH 值（5.56）、温度（25 °C）和接触时间（11.02 分钟），采用响应面方法学（RSM）和中央复合设计（CCD）进行了优化，吸附效率达到 99.45%。利用相关系数（R2）和几种统计误差函数（包括平均相对误差（ARE）、均方根误差（RMSE）、混合分数误差函数（HYBRID）和卡方检验（χ2））分析了 RSM-CCD 模型的能力。体外药物释放程序在不同的 pH 值（5.6 和 7.4）和温度（37 和 50 °C）下进行了评估。结果表明，在 50 °C、pH 值为 5.6 的条件下，6 小时内 BCT 的最大释放率为 87.2%，而在 37 °C、pH 值为 7.4 的条件下，释放率为 13.3%。此外，在 pH 值为 5.6 的条件下，经过 10 分钟的近红外照射后，负载 BCT 的载体显示出完全的 BCT 释放（100%）。动力学数据证实，最佳拟合属于零阶模型，药物释放遵循超ase II 运输机制。

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引用次数: 0

Interlayer engineering of layered double hydroxides for advanced energy storage and conversion 用于先进能量存储和转换的层状双氢氧化物层间工程

IF 5.9 3区材料科学 Q2 CHEMISTRY, PHYSICAL

FlatChem

Pub Date : 2024-11-01 DOI: 10.1016/j.flatc.2024.100775

Yiqun Chen , Yan Zhang , Xue Bai , Jie Zhao, Lijun Yang, Xizhang Wang, Qiang Wu, Zheng Hu

Layered double hydroxides (LDHs) are very attractive functional materials either for energy storage due to the high theoretical capacities or for energy conversion due to the abundant and tunable active sites. Many strategies have been developed to improve the energy storage and conversion performance such as morphology and composition regulation, defect engineering and interlayer engineering. We focus on the interlayer engineering of LDHs for advanced energy applications. Anion intercalation into the galleries of brucite-like layers can expand the interlayer distance to enhance mass/charge transfer and active sites exposure; exfoliation-reassembly with conductive materials can increase the electron transfer capability and the ratio of active sites, thus efficiently boosting their performances in energy applications. In this Review, the progress on interlayer engineering of LDHs via anion intercalation and exfoliation-reassembly as well as the improved energy storage and conversion performances are summarized. We also outline how interlayer engineering tunes the performances of LDHs, and discuss the key challenges and future directions. This Review sheds light on the exploration of advanced LDHs materials for energy storage and conversion, especially in supercapacitors and oxygen evolution electrocatalysis.

层状双氢氧化物（LDHs）是一种极具吸引力的功能材料，它既可用于理论容量高的能量存储，也可用于活性位点丰富且可调的能量转换。为了提高能量存储和转换性能，人们开发了许多策略，如形态和成分调节、缺陷工程和层间工程。我们重点研究了用于先进能源应用的 LDH 层间工程。阴离子插层进入类青金石层廊可扩大层间距离，从而增强质量/电荷转移和活性位点暴露；与导电材料进行剥离-组装可提高电子转移能力和活性位点比例，从而有效提升其在能源应用中的性能。在这篇综述中，我们总结了通过阴离子插层和剥离-组装实现 LDHs 层间工程的进展，以及所改善的能量存储和转换性能。我们还概述了层间工程如何调整 LDHs 的性能，并讨论了主要挑战和未来方向。本综述揭示了先进 LDHs 材料在能量存储和转换方面的应用前景，尤其是在超级电容器和氧进化电催化方面。

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引用次数: 0

Review on multifunctional elastomeric composites-based sensing for monitoring of aquatic and terrestrial living species 基于多功能弹性复合材料的水生和陆生生物物种监测传感技术综述

IF 5.9 3区材料科学 Q2 CHEMISTRY, PHYSICAL

FlatChem

Pub Date : 2024-11-01 DOI: 10.1016/j.flatc.2024.100776

Vineet Kumar, Md Najib Alam, Siraj Azam, Sang-Shin Park

The most recent literature (2019–2024) on the multifunctionality of elastomeric matrix-based composites is reviewed in this paper. The main multifunctionality focus of this review lies in summarizing the sensing for monitoring terrestrial or aquatic living species. The review started with a brief overview of the key points like an introduction to elastomeric composites. Then, the use of these sensors for monitoring terrestrial and aquatic living species is covered followed by the key subjects covered in this review paper. After the introduction, the fabrication process of these elastomeric composites was reported with a special focus on sensor fabrication for monitoring the living species. After fabrication, a special focus on the mechanical, electrical, and thermal properties of these sensors-based elastomeric composites was presented. A special focus on electrical properties including linearity, gauge factors, response time, and finally recovery time was presented. After properties, the paper’s final part summarizes the industrial usefulness of the work reported in the literature. These include insight into insect motion, adhesion performance in jellyfish, and monitoring various human motions assisted by artificial intelligence. Finally, this review underscores the critical role of the use of these sensors for our technical future for terrestrial and aquatic living species.

本文综述了有关弹性基质基复合材料多功能性的最新文献（2019-2024 年）。本综述的多功能性重点在于总结用于监测陆生或水生生物物种的传感。综述首先简要介绍了一些要点，如弹性体复合材料简介。然后，介绍了这些传感器在监测陆生和水生生物物种方面的应用，接着介绍了本综述所涉及的关键主题。介绍之后，报告了这些弹性复合材料的制造过程，并特别关注用于监测生物物种的传感器的制造。制作完成后，重点介绍了这些基于传感器的弹性复合材料的机械、电气和热性能。论文还特别介绍了电学特性，包括线性度、测量系数、响应时间以及最后的恢复时间。在属性之后，论文的最后一部分总结了文献中报告的工作在工业上的实用性。其中包括对昆虫运动、水母粘附性能以及人工智能辅助监测各种人体运动的深入研究。最后，这篇综述强调了使用这些传感器对我们未来陆生和水生生物的技术发展所起的关键作用。

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引用次数: 0

Porous N, P co-doping Ti3C2Tx MXene for high-performance capacitive deionization 用于高性能电容式去离子的多孔 N、P 共掺杂 Ti3C2Tx MXene

IF 5.9 3区材料科学 Q2 CHEMISTRY, PHYSICAL

FlatChem

Pub Date : 2024-11-01 DOI: 10.1016/j.flatc.2024.100772

Siqi Gong , Jing Li , Fan Zhao , Mengdie Yan , Chenghao Huang , Guanzhong Huo , Chunli Li , Bing Wu , Jiapeng Liu

The emerging energy-saving and environmentally friendly capacitive deionization (CDI) technology has attracted more and more attention. However, it remains a great challenge to develop CDI electrode materials with excellent comprehensive properties. Herein, the porous N, P co-doping Ti₃C₂T_x MXene (N, P-Ti₃C₂T_x) was prepared successfully by combining simple flocculation with an annealing process. Benefitting from the synergistic effect of the combination of porous structure and co-doping of N and P heteroatoms, the N, P-Ti₃C₂T_x exhibits substantial specific surface area, which provides more surface bounding active sites for electrochemical reactions, thus assisting to boost the CDI performance. As a result, the N, P-Ti₃C₂T_x exhibited an admirable salt (Na⁺) adsorption capacity of 53.3 mg g⁻¹ and exceptional recycling property. Impressively, the N, P-Ti₃C₂T_x also exhibited superior desalination performance of Pb²⁺, characterized by an exceptionally high desalination capacity of up to 168.2 mg g⁻¹ at 1.2 V, and the corresponding desalination rate reached 0.047 mg g⁻¹ s⁻¹. Additionally, the deionization mechanism involved was elucidated through a series of characterizations. This work will furnish an effective avenue for the innovative design of MXene-based electrode materials toward high-performance CDI.

新兴的节能环保型电容式去离子（CDI）技术受到越来越多的关注。然而，开发具有优异综合性能的 CDI 电极材料仍然是一项巨大的挑战。本文通过简单的絮凝和退火工艺成功制备了多孔 N、P 共掺杂 Ti3C2Tx MXene（N、P-Ti3C2Tx）。得益于多孔结构和 N、P 杂原子共掺杂的协同效应，N、P-Ti3C2Tx 显示出巨大的比表面积，为电化学反应提供了更多的表面结合活性位点，从而有助于提高 CDI 性能。因此，N, P-Ti3C2Tx 的盐（Na+）吸附容量高达 53.3 mg g-1，并具有优异的回收性能。令人印象深刻的是，N, P-Ti3C2Tx 还具有卓越的 Pb2+ 脱盐性能，在 1.2 V 电压下脱盐能力高达 168.2 mg g-1，相应的脱盐速率达到 0.047 mg g-1 s-1。此外，还通过一系列特性分析阐明了其中的去离子机制。这项工作将为创新设计基于 MXene 的电极材料以实现高性能 CDI 提供有效途径。

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引用次数: 0

In-situ grown hexagonal rod-like ZIF-L(Zn/Co) variant on reduced graphene oxide (rGO) for the enhanced electrochemical sensing of acetaminophen 在还原型氧化石墨烯 (rGO) 上原位生长六边形棒状 ZIF-L(Zn/Co)变体以增强对乙酰氨基酚的电化学传感能力

IF 5.9 3区材料科学 Q2 CHEMISTRY, PHYSICAL

FlatChem

Pub Date : 2024-11-01 DOI: 10.1016/j.flatc.2024.100773

Sai Iswarya Bakavaty T, Gurunathan Karuppasamy

Graphene – one of the most regarded materials in the world of Flatland has a substantial role in sensing applications due to its exceptional properties. Combining graphene with MOF can effectively mitigate the limitations of MOF while synergistically enhancing their unique properties. In this research work, we present a new hybrid composite of Zeolite Imidazolate Framework-L made composite with reduced graphene oxide, ZIF-L(Zn/Co)/rGO (ZLG) and applied its electrocatalytic performance in the sensitive detection of acetaminophen (AP). The mixture was prepared via a simple in-situ solvothermal method whose physico-chemical nature was investigated in detail. The ZIF-L phase identification, morphological change of ZIF, confirmation of rGO incorporation, and chemical composition analysis were established using the XRD, SEM, Raman and XPS respectively. Additionally, the kinetics of electron transfer was studied by EIS. Thereafter, proper optimization of various sensor parameters such as pH, scan rate and analytical performance were executed. Preliminary sensing studies carried out by cyclic voltammetry revealed an enhancement in peak current from 0.48µA to 1.05µA upon incorporation of rGO into the ZIF-L(Zn/Co) hybrid. Compared with reported studies along a similar vein, from the differential voltammetric analysis the ZLG-modified GCE displays a high selectivity towards AP with a broad linear range of 1 µM – 2060 µM exhibiting a sensitivity and LOD of 8.145 µA/mM and 162 nM respectively. The real-time validation of the sensor in paracetamol tablets and biological samples of human blood and urine exhibited recovery values in the range of ∼ 94 % − 102 %. Hence, this suggests a reliable practical applicability of the sensor owing to the high catalytic, large surface area and increased conductivity of the nanocomposite.

石墨烯--平地世界中最受瞩目的材料之一，因其卓越的性能而在传感应用中发挥着重要作用。将石墨烯与 MOF 结合可以有效缓解 MOF 的局限性，同时协同增强 MOF 的独特性能。在这项研究工作中，我们提出了一种由沸石咪唑酸盐框架-L 与还原型氧化石墨烯（ZIF-L(Zn/Co)/rGO (ZLG)）复合而成的新型混合复合材料，并将其电催化性能应用于对乙酰氨基酚（AP）的灵敏检测。该混合物是通过一种简单的原位溶热法制备的，对其物理化学性质进行了详细研究。利用 XRD、SEM、拉曼和 XPS 分别对 ZIF-L 相的鉴定、ZIF 的形态变化、rGO 的加入确认和化学成分分析进行了研究。此外，还通过 EIS 研究了电子转移动力学。随后，对各种传感器参数（如 pH 值、扫描速率和分析性能）进行了适当优化。通过循环伏安法进行的初步传感研究表明，在 ZIF-L（锌/钴）杂化物中加入 rGO 后，峰值电流从 0.48µA 增至 1.05µA。与已报道的类似研究相比，通过微分伏安分析，ZLG 修饰的 GCE 对 AP 具有很高的选择性，线性范围在 1 µM - 2060 µM 之间，灵敏度和 LOD 分别为 8.145 µA/mM 和 162 nM。在扑热息痛片剂以及人体血液和尿液生物样本中对该传感器进行的实时验证显示，其回收率在 94 % 至 102 % 之间。因此，由于纳米复合材料具有高催化性、大表面积和更高的导电性，这表明该传感器具有可靠的实用性。

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引用次数: 0

Electrochemical boost via thermally reduced graphene oxide for tailoring composite paste electrodes 通过热还原氧化石墨烯提高电化学性能，定制复合浆料电极

IF 5.9 3区材料科学 Q2 CHEMISTRY, PHYSICAL

FlatChem

Pub Date : 2024-10-24 DOI: 10.1016/j.flatc.2024.100766

M.A. Salguero Salas , V.C. Fuertes , D.M. Arciniegas Jaimes , N. Bajales , O.E. Linarez Pérez

Carbon-based composite materials are employed in diverse electrochemical applications, such as in catalysis, (bio)molecular sensing, and energy storage. In practice, electrode material needs to be highly conductive to allow high-speed electron transference to electrolyte species and possess high-surface area to obtain greater measured signals and power capabilities, as well as long useful life and stability. In this sense, graphene derivatives emerge as interesting candidates, even more so if they constitute part of practical, economical and versatile paste electrodes.

This work presents a detailed analysis of the electrochemical performance of paste electrodes fabricated with multilayer partially reduced graphene oxide (rGO). The rGO was strategically produced via thermal treatment as a key factor that minimizes both mass loss and energy consumption. The results obtained through diffraction, microscopy and spectroscopy techniques show an effective partial reduction in the range of 100 to 400 °C. Furthermore, the enhanced electrochemical performance of rGO was determined by exploring the specific capacitance from cyclic voltammetry (CV) and galvanostatic charge–discharge measurements (GCD) as well as charge transfer resistance via electrochemical impedance spectroscopy (EIS). Our results evidence how an integral performance with suitable chemical, structural and morphological properties achieved for GO heat-treated at 200 °C leads to an improved electronic conductivity when a small part is combined with graphite in paste electrodes. This latter combination provides higher versatility compared to other alternatives since it arises as an economical and effective carbonaceous matrix for (bio)electrochemical sensors, hybrid supercapacitors or other desired nanotechnological applications.

碳基复合材料被广泛应用于催化、（生物）分子传感和能量存储等电化学领域。在实践中，电极材料需要具有高导电性，以实现电子与电解质的高速传输，并拥有高表面积，以获得更大的测量信号和功率能力，以及更长的使用寿命和稳定性。从这个意义上说，石墨烯衍生物是一种有趣的候选材料，如果它们能成为实用、经济和多功能浆状电极的一部分，那就更加有趣了。本研究详细分析了用多层部分还原氧化石墨烯（rGO）制造的浆状电极的电化学性能。rGO 是通过热处理制成的，这是减少质量损失和能源消耗的关键因素。通过衍射、显微镜和光谱技术获得的结果表明，在 100 至 400 °C 的范围内，部分还原效果显著。此外，通过循环伏安法（CV）和电静态充放电测量（GCD）以及电化学阻抗光谱法（EIS）检测比电容，确定了 rGO 的增强电化学性能。我们的研究结果证明了在 200 °C 下热处理的 GO 具有合适的化学、结构和形态特性，当一小部分 GO 与石墨结合制成浆状电极时，其整体性能可提高电子传导性。与其他替代品相比，后一种组合具有更高的通用性，因为它是一种经济、有效的碳质基质，可用于（生物）电化学传感器、混合超级电容器或其他所需的纳米技术应用。

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引用次数: 0