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Building robust copper nanostructures via carbon coating derived from polydopamine for oxygen reduction reaction 通过聚多巴胺衍生的碳涂层构建坚固的纳米铜结构,用于氧还原反应
IF 8.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-10-28 DOI: 10.1016/j.mtnano.2024.100536
Jesús Cebollada , David Sebastián , Jun Yamasaki , Javier Agúndez , Maria Jesús Lázaro , Maria Victoria Martínez-Huerta
This study explores the synthesis and electrocatalytic performance of copper-nitrogen-carbon composites formed by Cu single atoms/clusters embedded in nitrogen-doped carbon with Cu/Cu2O nanoparticles (Cu-X-NC) for the oxygen reduction reaction (ORR). The catalysts were synthesized using polydopamine as a carbon and nitrogen source via the solvothermal carbonization (STC) method, followed by pyrolysis and acid washing. The effect of solvothermal carbonization temperature (120, 150, and 180 °C) on the structure and ORR activity was investigated. The physicochemical characterization showed that higher STC temperatures reduced the size of copper crystallites, slightly increased the formation of copper(I) oxide, and led to the creation of well-dispersed copper single atoms/clusters at 150 °C. This optimal dispersion enhances the interaction between the copper single atoms and the reactants, leading to faster ORR kinetics, as demonstrated by the lower charge transfer resistance values in electrochemical impedance spectroscopy measurements. Additionally, the balance between micropore and mesopore structures at this temperature facilitates efficient mass transport, which is critical for achieving higher ORR activity. Moreover, accelerated stability tests showed excellent durability for Cu-150-NC, with negligible loss in onset potential after 10,000 cycles. The solvothermal process significantly increased the electrochemically active surface area (ECSA), with Cu-150-NC displaying the highest specific activity and mass activity per gram of copper, indicating superior performance. Overall, these findings underscore the importance of synthesis optimization and provide valuable insights for designing eco-friendly and high-performance copper catalysts for fuel cell applications.
本研究探讨了铜单原子/簇嵌入氮掺杂碳与 Cu/Cu2O 纳米颗粒(Cu-X-NC)形成的铜氮碳复合材料的合成与电催化性能,用于氧还原反应(ORR)。催化剂以多多巴胺为碳源和氮源,通过溶解热碳化(STC)法合成,然后进行热解和酸洗。研究了溶热碳化温度(120、150 和 180 °C)对催化剂结构和 ORR 活性的影响。理化表征结果表明,较高的 STC 温度会减小铜晶体的尺寸,略微增加铜(I)氧化物的形成,并在 150 ℃ 时形成分散良好的铜单原子/簇。这种最佳分散性增强了铜单质与反应物之间的相互作用,从而加快了 ORR 动力学,电化学阻抗谱测量中较低的电荷转移电阻值就证明了这一点。此外,在这一温度下,微孔和中孔结构之间的平衡促进了有效的质量传输,这对实现更高的 ORR 活性至关重要。此外,加速稳定性测试表明,Cu-150-NC 具有出色的耐久性,在 10,000 次循环后,起始电位的损失可以忽略不计。溶热工艺显著增加了电化学活性表面积(ECSA),Cu-150-NC 显示出最高的比活度和每克铜的质量活度,表明其性能优越。总之,这些发现强调了合成优化的重要性,并为设计燃料电池应用的环保型高性能铜催化剂提供了宝贵的见解。
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引用次数: 0
PAM material that instantly gives ordinary fabrics excellent flame retardant and thermal insulation properties for fire rescue PAM 材料可瞬间赋予普通织物卓越的阻燃和隔热性能,用于消防救援
IF 8.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-10-24 DOI: 10.1016/j.mtnano.2024.100535
Bibo Zhou , Xiaoming Zhao , Yuanjun Liu
To effectively reduce the damage caused by flame burns or heat transfer to the human body during fire, we used PAM aqueous solution as the matrix, XG as the thickener, HPMC as the water-retaining agent to form the basic material system, and added different functional particles (APP, PTW, HCB) to prepare a fire-proof and heat-insulating PAM flame-retardant material for fire emergency rescue. Ordinary cotton fabrics were impregnated into PAM flame-retardant materials using a simple impregnation process. After the impregnation, the test was performed in a non-dropping state (simulating the thermal protection effect of PAM flame retardant materials directly acting on the outside of the human body at the fire scene). The results show that the PAM flame retardant material prepared by adding 4 wt% HCB has the best comprehensive performance. TPP test shows that spraying PAM flame retardant material on the outside of the fabric can instantly give the fabric a higher thermal protection performance. Under the total heat flux of 84 kW/m2, the thermal performance protection value of the fabric is 2641.8 kW s/m2, and the second-degree burn time can reach 31.45 s. PAM flame retardant material does not damage the fabric. After soaping, the air permeability of the fabric decreases slightly, the moisture permeability and wettability are improved, and the breaking strength is almost unchanged. The CCT test showed that the thermal radiation flux was 50 kW/m2, the PHRR value of PAM flame retardant material was 10.64552 kW/m2, the THR was 6.9 MJ/m2, and the flame retardant performance was excellent. The PAM flame retardant material prepared in this project can be applied to the fire scene and directly sprayed on the outside of the clothing of rescuers and recipients, giving the fabric a better thermal protection effect. It can also be used to extinguish fires in the external environment. This material offers a novel solution for enhancing fire rescuers' and victims' safety protection levels.
为有效降低火灾中火焰灼伤或热量传递对人体造成的伤害,我们以PAM水溶液为基体,以XG为增稠剂,以HPMC为保水剂,形成基本材料体系,并添加不同的功能性颗粒(APP、PTW、HCB),制备出一种防火隔热的PAM阻燃材料,用于火灾应急救援。采用简单的浸渍工艺将普通棉织物浸渍成 PAM 阻燃材料。浸渍后,在不滴水状态下进行测试(模拟火灾现场 PAM 阻燃材料直接作用于人体外部的热防护效果)。结果表明,添加 4 wt% HCB 制备的 PAM 阻燃材料综合性能最好。TPP 测试表明,在织物外部喷涂 PAM 阻燃材料可以瞬间提高织物的热防护性能。在 84 kW/m2 的总热流量下,织物的热性能保护值为 2641.8 kW s/m2,二度燃烧时间可达 31.45 s。皂洗后,织物的透气性略有下降,透湿性和润湿性有所改善,断裂强度几乎没有变化。CCT 试验表明,热辐射通量为 50 kW/m2,PAM 阻燃材料的 PHRR 值为 10.64552 kW/m2,THR 为 6.9 MJ/m2,阻燃性能优异。本项目制备的 PAM 阻燃材料可应用于火灾现场,直接喷涂在救援人员和受助人员的衣物外侧,使织物具有更好的热防护效果。它还可用于扑灭外部环境中的火灾。这种材料为提高火灾救援人员和受害者的安全保护水平提供了一种新的解决方案。
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引用次数: 0
Radar-infrared compatible stealth technology in advanced nano-composite materials: Mechanisms and structural optimization 先进纳米复合材料中的雷达-红外线兼容隐身技术:机理和结构优化
IF 8.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-10-20 DOI: 10.1016/j.mtnano.2024.100534
Yi Gao , Qian Yang , Li Ma , Tian Li , Qing Qi , Tian Yang , Fanbin Meng
Nowadays, multifunctional detection systems and reverse detection technologies play a dominant role in military reconnaissance and stealth gaming operations. Therefore, stealth technology, as the most powerful means of reverse detection, has increasingly become a research hot spot. In particular, when the detection weapons are equipped with radar and infrared detection, how to achieve effective compatibility of stealth to minimize the loss and the success of military operations is still a major challenge in current research. Therefore, this review provides an indepth discussion and distinction between the mechanisms of radar and infrared detection technologies, respectively, while emphasizing the technical challenges involved in achieving compatible stealth. Besides, the review explores the microwave absorption and infrared stealth properties of innovative advanced nano-composites materials (MXene, graphene, and metal-organic frameworks (MOFs)) reported to date. Subsequently, the review analyzes the properties, structural design, and optimization strategies of recently reported compatible stealth materials, ranging from low-dimensional to high-dimensional structures, and discusses in detail the recent advances in compatible stealth materials. Finally, the review summarizes the advantages of developing various materials and structures in this promising field, providing a comprehensive overview of their potential and efficacy.
如今,多功能探测系统和反向探测技术在军事侦察和隐形博弈行动中发挥着主导作用。因此,隐身技术作为反向探测的最有力手段,日益成为研究热点。特别是在探测武器配备雷达和红外探测时,如何实现隐身的有效兼容,最大限度地降低军事行动的损失和成功率,仍是当前研究的一大难题。因此,本综述分别对雷达和红外探测技术的机理进行了深入探讨和区分,同时强调了实现兼容隐身所涉及的技术挑战。此外,综述还探讨了迄今报道的创新先进纳米复合材料(MXene、石墨烯和金属有机框架(MOFs))的微波吸收和红外隐身特性。随后,综述分析了近期报道的兼容隐身材料(从低维结构到高维结构)的特性、结构设计和优化策略,并详细讨论了兼容隐身材料的最新进展。最后,综述总结了在这一前景广阔的领域开发各种材料和结构的优势,全面概述了它们的潜力和功效。
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引用次数: 0
Enhanced polarization sensitivity and tunability in truncated pyramidal GaAs quantum dots for FIR applications 增强截顶金字塔砷化镓量子点的偏振灵敏度和可调谐性,实现 FIR 应用
IF 8.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-10-19 DOI: 10.1016/j.mtnano.2024.100533
Suphawich Jindanate , Phatlada Sathongpaen , Attapon Amthong
The far-infrared (FIR) spectrum, covering wavelengths from 20 to 1000 μm, presents significant challenges for the manipulation and detection of polarized light, especially in the short-wavelength FIR range of 20–100 μm. This study investigates the effectiveness of truncated pyramidal GaAs quantum dots in improving the absorption coefficient of polarized light within this range. Utilizing the finite difference method to obtain numerical solutions of the Schrödinger equation within the adiabatic approximation, we analyze the effects of various base shapes—equilateral hexagon, irregular hexagon, and equilateral triangle—on the optical absorption coefficients when subjected to an electric field with different directions and magnitudes. Our results reveal that triangular pyramidal quantum dots offer enhanced polarization sensitivity and greater tunability of absorption peaks compared to structures with other base shapes. Moreover, the direction of the applied electric field is crucial for tuning the absorption peaks in the desired range of FIR wavelength. These findings demonstrate the potential of truncated pyramidal GaAs quantum dots not only for improving sensing technologies but also for managing electromagnetic interference in advanced communication systems.
远红外线(FIR)光谱的波长从 20 微米到 1000 微米不等,这给偏振光的操纵和探测带来了重大挑战,尤其是在 20-100 微米的短波长 FIR 范围内。本研究探讨了截顶金字塔砷化镓量子点在改善该范围内偏振光吸收系数方面的有效性。利用有限差分法在绝热近似条件下获得薛定谔方程的数值解,我们分析了不同基底形状(四边形六角形、不规则六角形和等边三角形)在不同方向和大小的电场作用下对光吸收系数的影响。研究结果表明,与其他基底形状的结构相比,三角形金字塔量子点具有更高的偏振灵敏度和更强的吸收峰可调性。此外,外加电场的方向对于在所需的红外波长范围内调节吸收峰至关重要。这些研究结果表明,截顶金字塔砷化镓量子点不仅具有改进传感技术的潜力,还具有管理先进通信系统中电磁干扰的潜力。
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引用次数: 0
A highly permeable nanoplatform based on functionalized carbon dots for synergistic reactive oxygen/nitrogen species tumor therapy 基于功能化碳点的高渗透性纳米平台,用于活性氧/氮协同治疗肿瘤
IF 8.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-10-19 DOI: 10.1016/j.mtnano.2024.100532
Jiangyong Li, Qin Li, Qian Yang, Qi Tang, Xiaoyi Hu, Qing Liu, Liangke Zhang
Reactive oxygen species (ROS)-based antitumor strategies, particularly chemodynamic therapy, have garnered considerable attention. However, challenges such as difficulties in achieving deep penetration, relatively low H2O2 levels in the tumor microenvironment, the requirement for low pH by the Fenton reaction, and their short lifespan have impeded satisfactory therapeutic outcomes. Hence, we have developed a nanoplatform with enhanced permeability that not only generates significant amounts of ROS but also converts them into longer-lasting reactive nitrogen species (RNS), thereby improving tumor therapy efficacy. In our study, carbon dots were functionalized by doping with gold atoms and grafting nitrosoglutathione (GSNO) to form ACN, which exhibits glucose oxidase-like properties and enables laser-responsive NO release. ACN and indocyanine green (ICG) were then loaded onto MnO2 nanoflowers to form MnO2@AI. Upon arrival at the tumor site, MnO2 reacts with H2O2 and GSH, leading to its degradation and the subsequent release of ACN, which is characterized by three permeation-promoting properties: ultra-small size, positive charge, and NO content. In addition, ACN promotes H2O2 production through glucose metabolism and reduces pH, both of which enhance the Fenton-like reaction of MnO2, thereby amplifying ROS generation. The ICG in MnO2@AI enhances its photothermal properties, leading to the responsive release of NO from GSNO grafted onto ACN, which then reacts with the increased ROS to generate more toxic RNS. Collectively, the approach described herein offers substantial potential for advancing the treatment of malignant tumors.
以活性氧(ROS)为基础的抗肿瘤策略,尤其是化学动力学疗法,已经引起了广泛关注。然而,由于难以实现深度渗透、肿瘤微环境中的 H2O2 水平相对较低、芬顿反应对低 pH 值的要求以及寿命较短等挑战,治疗效果难以令人满意。因此,我们开发了一种渗透性更强的纳米平台,它不仅能产生大量的 ROS,还能将其转化为更持久的活性氮(RNS),从而提高肿瘤治疗效果。在我们的研究中,通过掺杂金原子和接枝亚硝基谷胱甘肽(GSNO)对碳点进行功能化,形成了 ACN,它具有类似葡萄糖氧化酶的特性,可实现激光响应式 NO 释放。然后将 ACN 和吲哚菁绿(ICG)负载到 MnO2 纳米花上,形成 MnO2@AI。到达肿瘤部位后,MnO2 与 H2O2 和 GSH 发生反应,导致其降解,随后释放出 ACN,ACN 具有三个促进渗透的特性:超小型尺寸、正电荷和 NO 含量。此外,ACN 还能通过葡萄糖代谢促进 H2O2 的产生并降低 pH 值,这两者都能增强 MnO2 的 Fenton 类反应,从而扩大 ROS 的生成。MnO2@AI 中的 ICG 增强了其光热特性,导致接枝到 ACN 上的 GSNO 反应性地释放 NO,然后与增加的 ROS 反应生成毒性更强的 RNS。总之,本文所述的方法为推进恶性肿瘤的治疗提供了巨大的潜力。
{"title":"A highly permeable nanoplatform based on functionalized carbon dots for synergistic reactive oxygen/nitrogen species tumor therapy","authors":"Jiangyong Li,&nbsp;Qin Li,&nbsp;Qian Yang,&nbsp;Qi Tang,&nbsp;Xiaoyi Hu,&nbsp;Qing Liu,&nbsp;Liangke Zhang","doi":"10.1016/j.mtnano.2024.100532","DOIUrl":"10.1016/j.mtnano.2024.100532","url":null,"abstract":"<div><div>Reactive oxygen species (ROS)-based antitumor strategies, particularly chemodynamic therapy, have garnered considerable attention. However, challenges such as difficulties in achieving deep penetration, relatively low H<sub>2</sub>O<sub>2</sub> levels in the tumor microenvironment, the requirement for low pH by the Fenton reaction, and their short lifespan have impeded satisfactory therapeutic outcomes. Hence, we have developed a nanoplatform with enhanced permeability that not only generates significant amounts of ROS but also converts them into longer-lasting reactive nitrogen species (RNS), thereby improving tumor therapy efficacy. In our study, carbon dots were functionalized by doping with gold atoms and grafting nitrosoglutathione (GSNO) to form ACN, which exhibits glucose oxidase-like properties and enables laser-responsive NO release. ACN and indocyanine green (ICG) were then loaded onto MnO<sub>2</sub> nanoflowers to form MnO<sub>2</sub>@AI. Upon arrival at the tumor site, MnO<sub>2</sub> reacts with H<sub>2</sub>O<sub>2</sub> and GSH, leading to its degradation and the subsequent release of ACN, which is characterized by three permeation-promoting properties: ultra-small size, positive charge, and NO content. In addition, ACN promotes H<sub>2</sub>O<sub>2</sub> production through glucose metabolism and reduces pH, both of which enhance the Fenton-like reaction of MnO<sub>2</sub>, thereby amplifying ROS generation. The ICG in MnO<sub>2</sub>@AI enhances its photothermal properties, leading to the responsive release of NO from GSNO grafted onto ACN, which then reacts with the increased ROS to generate more toxic RNS. Collectively, the approach described herein offers substantial potential for advancing the treatment of malignant tumors.</div></div>","PeriodicalId":48517,"journal":{"name":"Materials Today Nano","volume":"28 ","pages":"Article 100532"},"PeriodicalIF":8.2,"publicationDate":"2024-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142527944","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Leveraging photosensitive and thermally stable luminescent Ba2ZnWO6:Eu3+, M+ (M+= Na, K , and Li) nanophosphor for targeted non-invasive and stain-free visualization of cracked tooth syndrome 利用具有光敏性和热稳定性的发光 Ba2ZnWO6:Eu3+、M+(M+= Na、K 和 Li)纳米荧光粉,对牙齿裂缝综合症进行有针对性的无创、无染色可视化治疗
IF 8.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-10-18 DOI: 10.1016/j.mtnano.2024.100531
Akshay Arjun , H.B. Premkumar , Lalitha S. Jairam , S.C. Sharma , H. Nagabhushana , G.P. Darshan
The cracked tooth syndrome poses a significant challenge in dentistry, thereafter untreated cases often lead to severe complications, such as pulpitis or complete tooth fracture, ultimately contributing to tooth loss. However, the conventional diagnostic methods to visualize microcracks in the tooth suffer from severe drawbacks, such as inaccurate cold stimulation, discomfort with probing, impractical staining techniques, and difficulty in distinguishing harmless craze lines from pathological cracks. To address this challenge, for the first time, we are proposing a novel approach by utilizing luminescent Ba2ZnWO6:Eu3+ (3 mol %), K+ (1 wt %) nanophosphor for improved imaging and diagnosis of cracked tooth syndrome. Herein, the double perovskite structured Ba2ZnWO6:Eu3+ (1–11 mol %), M+ (M+ = Na, K, and Li (1 wt %)) nanophosphors were synthesized via the sonochemical route. The photoluminescence emission spectra of the prepared Ba2ZnWO6:Eu3+ (1–11 mol %) nanophosphors displaying distinct peaks at 583, 595, 613, 662, and 720 nm, which ascribed to transitions from state 5D0 to 7FJ (J = 1–4) state of the Eu3+ ions, respectively. By adopting a strategic charge compensation mechanism, the enhancement in the luminescence emission intensity of about 1.5-fold was achieved after co-doping K+ (1 wt %) with Ba2ZnWO6:Eu3+ (3 mol %) nanophosphor. The photometric studies of the phosphors portray their orange-red emission with excellent quantum efficiency (82.52 %), and color purity (∼ 99 %). The emission intensity was sustained up to 73.71 % at 473 K, indicating excellent thermal stability of the phosphor. The in vitro cytotoxicity assessments of the optimized nanophosphor demonstrated its biocompatibility on normal non-malignant oral fibroblasts. The visualized microcracks in the tooth using optimized Ba2ZnWO6:Eu3+ (3 mol %), K+ (1 wt %) nanophosphor under UV excitation of UV 365 and 395 nm light revealed the orientation of microcracks, crack width, depth of the crack, and microcrack branching without any stain. The aforementioned results demonstrated that the proposed methodology paves the way for a new avenue in dental imaging technology with the potential to revolutionize and improve patient care outcomes.
牙齿裂缝综合症是牙科领域的一个重大挑战,此后,未经治疗的病例往往会导致严重的并发症,如牙髓炎或牙齿完全断裂,最终导致牙齿脱落。然而,用于观察牙齿微裂缝的传统诊断方法存在严重缺陷,如冷刺激不准确、探查不适、染色技术不实用、难以区分无害裂纹和病理裂缝等。为了应对这一挑战,我们首次提出了一种新方法,即利用发光的 Ba2ZnWO6:Eu3+ (3 mol %)、K+ (1 wt %) 纳米磷来改善裂纹牙综合症的成像和诊断。本文通过声化学方法合成了双包晶结构的 Ba2ZnWO6:Eu3+ (1-11 mol %), M+ (M+ = Na, K, Li (1 wt %))纳米荧光粉。所制备的 Ba2ZnWO6:Eu3+ (1-11 mol %) 纳米荧光粉的光致发光发射光谱在 583、595、613、662 和 720 nm 处分别显示出不同的峰值,这些峰值分别归因于 Eu3+ 离子从 5D0 态到 7FJ (J = 1-4) 态的跃迁。通过策略性电荷补偿机制,K+(1 wt %)与 Ba2ZnWO6:Eu3+ (3 mol %)纳米荧光粉共掺杂后,发光强度提高了约 1.5 倍。对这些荧光粉的光度研究表明,它们能发出橙红色的光,量子效率(82.52%)和颜色纯度(∼ 99%)都很高。在开氏 473 度时,发射强度可持续高达 73.71%,这表明荧光粉具有极佳的热稳定性。优化纳米荧光粉的体外细胞毒性评估表明,它对正常非恶性口腔成纤维细胞具有生物相容性。在紫外线 365 和 395 纳米波长的紫外光激发下,使用优化的 Ba2ZnWO6:Eu3+ (3 mol %)、K+ (1 wt %)纳米荧光粉观察牙齿的微裂纹,可显示微裂纹的方向、裂纹宽度、裂纹深度和微裂纹分支,且无任何染色。上述结果表明,所提出的方法为牙科成像技术的新途径铺平了道路,有望彻底改变和改善患者的治疗效果。
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引用次数: 0
2D isoporous materials: From precursor molecular structures to post-processing methods 二维等多孔材料:从前驱体分子结构到后处理方法
IF 8.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-10-10 DOI: 10.1016/j.mtnano.2024.100523
Yang Yang , Xianhui Li , Cheng Xiang
The emerging of two-dimensional (2D) isoporous materials forwarded the applications of membrane materials in cutting-edge fields such as refined separation, atom uptake and single-molecule detection. The key to the design of these materials lies in the precise tailoring of the pore structures. This review presents the state-of-the-art advancements of 2D isoporous materials, highlights the construction of isoporous structures in 2D materials through the bottom-up and top-down synthesis strategies, and reviews various fabrication routes. It comprehensively summarizes the impact of interface selection, precursor design and post-processing on pore formation, pore geometry and edge structures. The feasibility of the material scale-up, current challenges and future development prospects are outlined.
二维(2D)等孔材料的出现推动了膜材料在精制分离、原子吸收和单分子检测等尖端领域的应用。这些材料设计的关键在于孔结构的精确定制。本综述介绍了二维等孔材料的最新进展,重点介绍了通过自下而上和自上而下的合成策略在二维材料中构建等孔结构的方法,并综述了各种制备路线。文章全面总结了界面选择、前驱体设计和后处理对孔隙形成、孔隙几何形状和边缘结构的影响。还概述了材料放大的可行性、当前面临的挑战和未来的发展前景。
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引用次数: 0
High performance self-driven broadband photodetector for polarized imaging based on novel ZrS3/ReSe2 van der Waals heterojunction 基于新型 ZrS3/ReSe2 范德华异质结的高性能自驱动偏振成像宽带光电探测器
IF 8.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-10-09 DOI: 10.1016/j.mtnano.2024.100527
Lingqi Huang, Peipei Li, Chao Feng, Jing Zhang, Liyun Zhao, Jie Sun, Changhui Du, Wenjia Wang, Kuilong Li
The distinctive characteristics of anisotropic two-dimensional (2D) materials, including in-plane anisotropy of optical absorption and carrier mobility, render them exceptionally suitable for application in the field of polarization detection and as a novel platform for the polarization imaging. Meanwhile, the consolidation of diverse functionalities within a single photodetector is highly anticipated to meet the demands of some special scenarios. Herein, a novel ZrS3/ReSe2 van der Waals (vdWs) heterostructure device was successfully constructed to realize polarization-sensitive, self-powered, and broadband photodetection and imaging. Owing to the built-in electric field of the type-II band alignment within the heterojunction, the device achieves a self-powered photoresponse ranging from 300 to 980 nm, an ultralow dark currentt ∼1 pA, and a commendable rise/decay time of 0.35/0.28 ms. Additionally, it has been demonstrated that the self-driven photodetector possesses a polarization-sensitivity with a notable anisotropic ratio about 2.02 (1.98) under 490 nm (980 nm) light illumination with zero bias, coupled with an excellent repeatability and stability. Furthermore, we also demonstrate the polarization imaging capabilities of the device in visible and near-infrared spectrum, realizing a contrast-enhanced degree of linear polarization imaging. This work paves a new platform to develop heterojunction photodetectors for high performance polarization-sensitive photodetection and next-generation polarized imaging.
各向异性二维(2D)材料的独特特性,包括光学吸收和载流子迁移率的面内各向异性,使其特别适合应用于偏振检测领域,并成为偏振成像的新型平台。同时,在单个光电探测器中整合多种功能以满足一些特殊应用场景的需求也备受期待。在此,我们成功构建了一种新型 ZrS3/ReSe2 范德瓦耳斯(vdWs)异质结构器件,以实现偏振敏感、自供电和宽带光电探测与成像。由于异质结内 II 型带排列的内置电场,该器件实现了从 300 纳米到 980 纳米的自供电光响应、超低暗电流 t ∼ 1 pA 以及值得称赞的 0.35/0.28 毫秒上升/衰减时间。此外,我们还证明了自驱动光电探测器具有偏振灵敏度,在 490 nm(980 nm)光照和零偏压条件下,各向异性比约为 2.02(1.98),同时具有出色的重复性和稳定性。此外,我们还展示了该装置在可见光和近红外光谱下的偏振成像能力,实现了对比度增强的线性偏振成像。这项工作为开发用于高性能偏振敏感光探测和下一代偏振成像的异质结光电探测器铺平了新的平台。
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引用次数: 0
LaFe-MOFs derivatives with different compositions for boosting low-frequency and broadband electromagnetic wave absorption 不同成分的 LaFe-MOFs 衍生物用于提高低频和宽带电磁波吸收率
IF 8.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-10-09 DOI: 10.1016/j.mtnano.2024.100528
Xiaoli Wang , Juhua Luo , Huajun Zhao , Yuhan Wu , Xing Liu , Yu Xie
To achieve low-frequency and broadband electromagnetic wave absorption (EMWA), building excellent metal-organic frameworks (MOFs)-derived EMWA materials is critical but remains challenging. In this research, La2O3/La2O2CN2/Fe/N-doped carbon (LFC) composites with different compositions were synthesized by adjusting the La3+ content to tune the electromagnetic parameters. As the La3+ content increased, the EMWA performance showed a trend of first increasing and then decreasing. As a result, LFC-2 achieved a minimum reflection loss (RLmin) value of −60.82 dB at a thickness of 2.60 mm when the molar ratio of La3+ to Fe3+ was 1: 1, along with an effective absorption bandwidth value of 5.76 GHz (9.84–15.60 GHz) at 2.29 mm. Moreover, the EMWA performance of LFC-3 at low-frequency (4.08 GHz) was enhanced when the La³⁺ to Fe³⁺ molar ratio was 2: 1, with an RLmin value of −47.47 dB. Comprehensive characterizations suggested that the formation of the La2O2CN2 phase played an indispensable role in optimizing impedance matching and enhancing magnetic loss and dielectric loss. In addition, La3+ had a high coordination number, which effectively regulated the electromagnetic parameters. Concurrently, radar cross-section simulation results confirmed the outstanding EMWA capability of the LFC coating. This work proposed a strategy for LaFe-MOFs derivatives, shedding light on the foundation for designing more efficient low-frequency and broadband absorbent materials.
要实现低频和宽带电磁波吸收(EMWA),构建由金属有机框架(MOFs)衍生的优异电磁波吸收材料至关重要,但仍然具有挑战性。本研究通过调节 La3+ 的含量,合成了不同成分的 La2O3/La2O2CN2/Fe/N 掺杂碳(LFC)复合材料,以调节电磁参数。随着 La3+ 含量的增加,EMWA 性能呈现出先升高后降低的趋势。结果,当 La3+ 与 Fe3+ 的摩尔比为 1:1 时,LFC-2 在厚度为 2.60 mm 时的最小反射损耗(RLmin)值为 -60.82 dB,在 2.29 mm 时的有效吸收带宽值为 5.76 GHz(9.84-15.60 GHz)。此外,当 La³⁺ 与 Fe³⁺ 的摩尔比为 2: 1 时,LFC-3 在低频(4.08 GHz)的 EMWA 性能得到增强,RLmin 值为 -47.47 dB。综合表征结果表明,La2O2CN2 相的形成在优化阻抗匹配、提高磁损耗和介电损耗方面发挥了不可或缺的作用。此外,La3+ 的配位数较高,可有效调节电磁参数。同时,雷达截面模拟结果也证实了 LFC 涂层出色的电磁兼容能力。这项研究提出了 LaFe-MOFs 衍生物的策略,为设计更高效的低频和宽带吸波材料奠定了基础。
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引用次数: 0
3D printed PEEK/CF nanocomposites metamaterial for enhanced resonances toward microwave absorption and compatible camouflage 三维打印 PEEK/CF 纳米复合材料超材料,用于增强微波吸收共振和兼容伪装
IF 8.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-10-09 DOI: 10.1016/j.mtnano.2024.100530
Xinghan Huang , Ximing Zhang , Guoke Wei , Hang Zhang , Shujuan Tan , Guangbin Ji
The stealth materials for future weapons and equipment need to operate within the radar working band, be lightweight, easy to process, and compatible with infrared stealth. Integrating all these characteristics poses a significant challenge. This work utilizes poly (ether-ether-ketone)/carbon fibers (PEEK/CF) composite materials and employed reverse-guided manufacturing through simulation design. Incorporating a grid structure within the pyramid metamaterial enables electromagnetic wave reflecting multiple times in various directions. By optimizing the important interaction between dielectric properties of the materials structures,the Pyramid Grid Filled Metamaterial enables broadband electromagnetic wave absorption (<-10 dB, 8–18 GHz), weak angular dependence (5- 45o incidence), polarization insensitivity, radar cross section (RCS) reduction (reduction over 10 dB between θ = −60° and 60°), and infrared camouflage performance. The PGF metamaterial of 180◊180 mm2, weighs only 103.1 g at a thickness of 9 mm. This work paves a way for the design the radar infrared compatible composite metamaterials.
未来武器装备的隐形材料需要在雷达工作波段内工作,重量轻,易于加工,并与红外隐形兼容。整合所有这些特性是一项重大挑战。这项研究利用聚醚醚酮/碳纤维(PEEK/CF)复合材料,通过模拟设计采用反向引导制造。在金字塔超材料中加入网格结构,可实现电磁波在不同方向的多次反射。通过优化材料结构介电特性之间的重要相互作用,金字塔网格填充超材料实现了宽带电磁波吸收(-10 dB,8-18 GHz)、弱角度依赖性(5-45°入射角)、极化不敏感性、雷达截面(RCS)减小(θ = -60° 和 60° 之间减小超过 10 dB)和红外伪装性能。PGF 超材料的面积为 180◊180 平方毫米,厚度为 9 毫米,重量仅为 103.1 克。这项工作为设计雷达红外兼容复合超材料铺平了道路。
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引用次数: 0
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Materials Today Nano
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