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The Physical Characterization of Extracellular Vesicles for Function Elucidation and Biomedical Applications: A Review 用于功能阐释和生物医学应用的细胞外囊泡的物理特性:综述
IF 2.7 4区 材料科学 Q3 CHEMISTRY, PHYSICAL Pub Date : 2024-06-20 DOI: 10.1002/ppsc.202400024
Emma J. Morris, Harleen Kaur, Garima Dobhal, Shiana Malhotra, Zeineb Ayed, Anna L. Carpenter, Renee V. Goreham
Extracellular vesicles are promising candidates for novel biomedical applications due to their universal secretion by all organisms. Despite their discovery in 1971, understanding of extracellular vesicles remains in its infancy due to their complex nature and nanoscale dimensions, which make characterization challenging. Extracellular vesicles contain a diverse array of proteins, making them valuable for identifying disease‐specific biomarkers and driving research since 2007. However, identifying these biomarkers remains difficult and expensive. Advancements in extracellular vesicle techniques, including single extracellular vesicle characterization, hold promise for disease diagnosis and personalized medicine. Notably, the biomechanical properties of extracellular vesicles have emerged as a potential diagnosis tool. However, biomechanical characterization has rarely been investigated for disease diagnosis due to limited understanding and a lack of standardized protocols. Recently, significant advancements have been made using various techniques such as atomic force microscopy and micropipette aspiration. This review explores recent developments in biomechanical analysis, demonstrating novel disease diagnostic pathways facilitated by extracellular vesicles and outlining future research directions.
细胞外囊泡是新型生物医学应用的理想候选物质,因为所有生物都会分泌这种物质。尽管细胞外囊泡早在 1971 年就被发现,但由于其复杂的性质和纳米级的尺寸,人们对它们的了解仍处于起步阶段,这使得表征具有挑战性。自 2007 年以来,细胞外囊泡含有多种多样的蛋白质,这使它们在确定疾病特异性生物标志物和推动研究方面具有重要价值。然而,鉴定这些生物标记物仍然困难重重、费用高昂。细胞外囊泡技术的进步,包括单个细胞外囊泡的表征,为疾病诊断和个性化医疗带来了希望。值得注意的是,细胞外囊泡的生物力学特性已成为一种潜在的诊断工具。然而,由于对生物力学特性的了解有限以及缺乏标准化的方案,很少有人研究生物力学特性来诊断疾病。最近,利用原子力显微镜和微吸管抽吸等各种技术取得了重大进展。本综述探讨了生物力学分析的最新进展,展示了细胞外囊泡促进疾病诊断的新途径,并概述了未来的研究方向。
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引用次数: 0
Tungsten Nanoparticles Generated in an Atmospheric Pressure Plasma Jet 在大气压等离子体射流中生成的钨纳米粒子
IF 2.7 4区 材料科学 Q2 Physics and Astronomy Pub Date : 2024-05-30 DOI: 10.1002/ppsc.202400037
Martin Müller, Maren Dworschak, Jan Benedikt, Lorenz Kienle
The atmospheric pressure plasma source HelixJet has been used to generate tungsten nanocrystals with narrow size distributions, well defined size control and with a considerably good particle yield. Tungsten particles are produced as the result of an evaporation process of a tungsten wire inserted on the middle axis of the jet after the wire is heated by interaction with the plasma. Temperature measurements using a thermocouple and by optical emission spectroscopy showed that, while the overall temperature of the wire is very high, it is not in the range of the melting temperature of tungsten; however, it can reach values needed for sublimation. Additionally, the wire is heated selectively while the temperature of the jet components reaches only a few hundred degrees Celsius. The particles cluster into agglomerates and their formation has been analyzed in relation to the reliability of a commercial scanning mobility particle sizer spectrometer. The dependence of the particle morphology and crystal structure on the plasma parameters such as power and gas flow was studied via transmission electron microscopy and the average size of the tungsten nanocrystals could be tuned between 12 and 25 nm.
常压等离子体源 HelixJet 已被用于生成钨纳米晶体,其粒度分布窄,粒度控制明确,颗粒产量相当高。钨丝与等离子体相互作用加热后,在喷射器中轴线上插入的钨丝蒸发过程中产生钨颗粒。使用热电偶和光学发射光谱进行的温度测量表明,虽然钨丝的整体温度很高,但并不在钨的熔化温度范围内;不过,它可以达到升华所需的温度值。此外,金属丝是有选择地加热的,而喷射成分的温度仅达到几百摄氏度。颗粒聚集成团,其形成与商用扫描迁移率颗粒测定仪光谱仪的可靠性有关。通过透射电子显微镜研究了颗粒形态和晶体结构对等离子参数(如功率和气体流量)的依赖性,钨纳米晶体的平均尺寸可在 12 至 25 纳米之间调整。
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引用次数: 0
Ultra‐Small Au Nanoclusters with Tailored Photoluminescence Properties using Modified Thiol Ligands: A Computational and Experimental Demonstration 利用改性硫醇配体定制具有光致发光特性的超小金纳米团簇:计算和实验证明
IF 2.7 4区 材料科学 Q2 Physics and Astronomy Pub Date : 2024-05-25 DOI: 10.1002/ppsc.202400011
Anurag M. Chahande, Ashakiran Maibam, Sailaja Krishnamurty, R. Nandini Devi
Au nanoclusters with tailored photoluminescence can be obtained through controlled nanoparticle ligand interface chemistry. The present work reports molecular gold nanoclusters with tuneable photoluminescence emission from 600 to 700 nm using N,N′,N″‐trialkyl (11‐mercaptoundecyl)ammonium chloride ligands as capping‐agents. The tunability within red spectral region is regulated through specific interface chemistry between gold nanoclusters of molecular range and functional groups of the quaternary ammonium head over N,N′,N″‐trialkyl(11‐mercaptoundecyl)ammonium chloride. Combined understanding obtained from the spectroscopy, microscopy, and density functional theory studies demonstrate that the functional group specific electronic interactions at the interfaces steer the emission characteristics of “molecular” Au nanoparticles. The study clearly identifies that bulkier functional groups, i.e., triethyl, tripropyl, tributyl, and dimethyl benzene over N+ (of thiol ligand) through their steric effects minimize the particle size giving rise to tunable photoluminescence emission in red spectral region. However, the red shift seen in the emission Au nanoclusters with N‐(11‐mercaptoundecyl)‐N,N′‐dimethylbenzenammonium chloride ligand in contradiction to particle size effect is computationally proved to be due to the delocalization of electron density from benzene aromatic ring to N+ of ammonium head leading to a reduction in the HOMO‐LUMO energy gap.
通过控制纳米粒子配体界面化学,可以获得具有定制光致发光的金纳米团簇。本研究以 N,N′,N″-三烷基(11-巯基十烷基)氯化铵配体为封端剂,报道了具有 600 至 700 纳米波长可调光致发光的分子金纳米团簇。通过分子范围的金纳米团簇与 N,N′,N″-三烷基(11-巯基)氯化铵上的季铵头官能团之间特定的界面化学反应,调节了红色光谱区域内的可调谐性。从光谱学、显微镜和密度泛函理论研究中获得的综合认识表明,界面上官能团特定的电子相互作用引导着 "分子 "金纳米粒子的发射特性。研究清楚地表明,体积较大的官能团,即三乙基、三丙基、三丁基和二甲基苯,在 N+(硫醇配体的 N+)上通过其立体效应使颗粒尺寸最小化,从而在红色光谱区域产生可调的光致发光发射。然而,计算证明,与粒径效应相反的是,使用 N-(11-巯基十四烷基)-N,N′-二甲基苯氯化铵配体的金纳米团簇的发射红移是由于电子密度从苯芳香环分散到铵头的 N+,从而导致 HOMO-LUMO 能隙减小。
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引用次数: 0
Interface‐Driven DNA/Metal–Organic Framework Hybrids for Biosensing and Biomedical Applications 用于生物传感和生物医学应用的界面驱动 DNA/金属有机框架混合物
IF 2.7 4区 材料科学 Q2 Physics and Astronomy Pub Date : 2024-05-11 DOI: 10.1002/ppsc.202400039
Zhaoyu Han, Zhenglian Li, Biwu Liu
Metal–organic frameworks (MOFs) have emerged as promising materials for biosensing and biomedical applications due to their exceptional structural properties and tunable functionalities. Integrating functional DNA with MOFs offers numerous advantages, including enhanced colloidal stability, target‐induced signal amplification, improved cellular uptake, and controlled drug release. This focused review aims to highlight key insights into the DNA–MOF interface to facilitate the design and application of these conjugates. A succinct summary of the interactions between DNA and MOFs, covering both noncovalent adsorption and covalent conjugation is provided. Moreover, recent advancements in utilizing DNA–MOF conjugates in biosensors, with a specific emphasis on fluorescent and electrochemical sensing are discussed. Additionally, applications in bioimaging, controlled drug delivery, and nucleic acid delivery are explored. Finally, the limitations of existing designs and provide insightful perspectives for the future development of DNA–MOFs, aiming to expedite their integration and impact in the realm of biomedical applications are addressed.
金属有机框架(MOFs)因其优异的结构特性和可调的功能性,已成为生物传感和生物医学应用领域前景广阔的材料。将功能性 DNA 与 MOFs 相结合具有诸多优势,包括增强胶体稳定性、靶诱导信号放大、改善细胞吸收和控制药物释放。这篇重点综述旨在强调 DNA-MOF 界面的关键见解,以促进这些共轭物的设计和应用。文章简明扼要地总结了 DNA 与 MOFs 之间的相互作用,包括非共价吸附和共价结合。此外,还讨论了在生物传感器中利用 DNA-MOF 共轭物的最新进展,特别强调了荧光和电化学传感。此外,还探讨了 DNA-MOF 在生物成像、可控药物递送和核酸递送中的应用。最后,还讨论了现有设计的局限性,并为 DNA-MOFs 的未来发展提供了富有洞察力的视角,旨在加快其在生物医学应用领域的整合和影响。
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引用次数: 0
Functional Soft Materials with Resistance to Liquid Leakage for Thermal Energy Storage 用于热能存储的抗液体泄漏功能性软材料
IF 2.7 4区 材料科学 Q2 Physics and Astronomy Pub Date : 2024-05-09 DOI: 10.1002/ppsc.202400031
Haiquan Zhang, Qiaoming Fang, Fege Wang, Bozhou Cao, Ling Wang, Wei He, Songjiao Chen, Ning Wang
Functional soft materials have great potential commercial applications in thermal energy storage, which are required to have a long life, good flexibility, and resistance to liquid leakage. Herein, a composite hydrogel with thermal storage properties is prepared through coupling molecular self‐assembly and in situ polymerization. Hydrophobic stearic acid (SA), as a thermal storage phase change material (PCM), is dispersed in polyacrylamide (PAM) hydrogel network in the form of oil–water emulsion (O/W). The PAM polymer network with good flexibility physically limits high‐frequency collision between SA PCM droplets. This unique design avoids demulsification in phase change emulsion so that the as‐prepared hydrogel composite can resist liquid leakage. The PAM hydrogel network plays the role of heterogeneous nucleation, resulting in the super‐cooling of SA emulsion at only 0.3 °C. On the other hand, SA PCM droplets in as‐prepared soft material do not directly contact with liquid water, so melting/crystallization process is independent of water. As a result, the soft material exhibits a thermal storage density of up to 99.3 J g−1. The present study is an important step toward designing soft energy storage materials.
功能性软材料在热能储存领域具有巨大的商业应用潜力,它要求具有较长的使用寿命、良好的柔韧性和抗液体泄漏能力。本文通过分子自组装和原位聚合耦合制备了一种具有热存储特性的复合水凝胶。疏水性硬脂酸(SA)作为一种蓄热相变材料(PCM),以油水乳液(O/W)的形式分散在聚丙烯酰胺(PAM)水凝胶网络中。具有良好柔韧性的 PAM 聚合物网络从物理上限制了 SA PCM 液滴之间的高频碰撞。这种独特的设计避免了相变乳液中的反乳化现象,因此制备的水凝胶复合材料可以防止液体泄漏。PAM 水凝胶网络起到了异质成核的作用,使 SA 乳液的超冷温度仅为 0.3 °C。另一方面,制备的软材料中的 SA PCM 液滴不直接与液态水接触,因此熔化/结晶过程与水无关。因此,这种软材料的蓄热密度高达 99.3 J g-1。本研究为设计软储能材料迈出了重要一步。
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引用次数: 0
Role of Silica, Carbon, and ZnO Nanomaterials in the Fabrication of Electrochemical Sensors for the Detection of Water Contaminants and Food Dye 二氧化硅、碳和氧化锌纳米材料在制造用于检测水污染物和食品染料的电化学传感器中的作用
IF 2.7 4区 材料科学 Q2 Physics and Astronomy Pub Date : 2024-04-29 DOI: 10.1002/ppsc.202400020
Sampurna Santra, Deepshikha Datta, Soheli Biswas, Bimal Das
Silica‐based nanomaterials have attracted huge attention for maximizing their safety and efficacy due to their nontoxicity, chemical and thermal stability, size tunability, and versatile functionality. Nanosilica with ZnO or carbon in a composite has excellent usage as an electrochemical sensor. Recent technological progression in nanotechnology and nanoscience has seen a number of applications of zinc oxide (ZnO) nanomaterials ranging from electronics, and sensing to environmental, and biomedical applications because of its various applications, multifunction, high specific surface area, stability, biocompatibility, nontoxicity, electrochemical activities, and so on. Carbon also has various advantageous properties like renewability, low ohmic resistance, and very stable response due to which carbon paste electrodes have attracted attention in the fabrication of electrochemical sensors. Electrochemical sensors are inexpensive, portable, and have excellent ability in detecting water contaminants, pesticides, disinfectants, pathogens, and different molecules. Artificial dyes are usually mixed with vegetable sauces, drinks, and other food items, which can cause cancer in human body. Voltametric methods with electrochemical sensors can be used to detect them in food samples. In this review, the present applications of ZnO and carbon nanomaterial‐based chemical sensors are meticulously studied to detect water contaminants and food dyes where nanosilica plays an important role as a sensor modifier.
硅基纳米材料因其无毒性、化学和热稳定性、尺寸可调性和多功能性,在最大限度地提高安全性和功效方面引起了广泛关注。纳米二氧化硅与氧化锌或碳的复合材料可用作电化学传感器。由于氧化锌(ZnO)具有多种用途、多功能、高比表面积、稳定性、生物相容性、无毒性、电化学活性等特点,近年来纳米技术和纳米科学的发展见证了氧化锌(ZnO)纳米材料在电子、传感、环境和生物医学等领域的大量应用。碳还具有可再生性、低欧姆电阻和非常稳定的响应等各种优势特性,因此碳浆电极在电化学传感器的制造中备受关注。电化学传感器价格低廉、便于携带,在检测水污染物、杀虫剂、消毒剂、病原体和不同分子方面具有出色的能力。人造染料通常混入蔬菜调味汁、饮料和其他食品中,会在人体内致癌。使用电化学传感器的伏安法可以检测食品样品中的人工染料。在这篇综述中,详细研究了目前基于氧化锌和碳纳米材料的化学传感器在检测水污染物和食品染料方面的应用,其中纳米二氧化硅作为传感器改性剂发挥了重要作用。
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引用次数: 0
Fabrication and Optical Measurement of a Suspended Particle Monolayer 悬浮粒子单层的制作与光学测量
IF 2.7 4区 材料科学 Q2 Physics and Astronomy Pub Date : 2024-04-29 DOI: 10.1002/ppsc.202400027
Seonghyeon Kim, Gwang hyeon Yu, Hojin Kim
The formation of a particle monolayer after the evaporation of a suspension droplet containing micro/nanoparticles is critical for multiple applications, including cell printing, particle immunoassays, and electronics. However, conventional methods for forming monolayers have limitations in terms of the use of solid substrates to fix them. In this paper, a novel method is proposed for forming a microparticle monolayer suspended in air using a through‐hole chip. Utilizing the strong interactions between particles and solid/liquid interfaces at the microscale, a simple yet robust method is developed to fabricate a suspended monolayer via particle suspension evaporation. The particle layers are classified into four types according to the particle concentration and suspension volume, namely, burst, ring, mono and ring, and multi patterns. Reorganization of the particle monolayer is achieved despite the repetitive solvent reinfusion and evaporation processes. Remarkably, the suspended particle monolayer exhibits superior optical characteristics, with a signal‐to‐noise ratio that is 1.78 times higher in fluorescence measurements than the same particles placed on a glass plate. This suspended particle monolayer can be applied in a variety of fields requiring sensitive and reproducible particle detection.
含有微/纳米粒子的悬浮液滴蒸发后形成的粒子单层对多种应用至关重要,包括细胞打印、粒子免疫测定和电子学。然而,形成单层的传统方法在使用固体基底固定单层方面存在局限性。本文提出了一种利用通孔芯片形成悬浮在空气中的微颗粒单层的新方法。利用颗粒与微尺度固/液界面之间的强烈相互作用,开发出一种简单而稳健的方法,通过颗粒悬浮蒸发来制造悬浮单层。根据粒子浓度和悬浮体积,粒子层可分为四种类型,即爆裂型、环型、单环型和多环型。尽管需要重复溶剂再注入和蒸发过程,但颗粒单层的重组仍然得以实现。值得注意的是,悬浮颗粒单层具有优异的光学特性,在荧光测量中,其信噪比是放置在玻璃板上的相同颗粒的 1.78 倍。这种悬浮颗粒单层可应用于各种需要灵敏、可重复颗粒检测的领域。
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引用次数: 0
Synthesis, Characterization, and Evaluation of Antioxidant, Anti‐Inflammatory, and Antimicrobial Activities of Zinc Oxide Nanoparticles Using Adiantum capillus‐veneris L. Leaf Extract 利用 Adiantum capillus-veneris L. 叶提取物合成纳米氧化锌颗粒并对其抗氧化、抗炎和抗菌活性进行表征和评估
IF 2.7 4区 材料科学 Q2 Physics and Astronomy Pub Date : 2024-04-26 DOI: 10.1002/ppsc.202400005
Bushra H. Shnawa, Parwin J. Jalil, Renjbar M. Mhammedsharif, Bakhtiyar A. Faqe, Meysam H. Ahmed, Hawar N. Ibrahim, Mukhtar H. Ahmed
Due to its unique properties and advantageous traits, zinc oxide has garnered significant attention in recent years for the green synthesis of ZnO nanoparticles (ZnO‐NP). This paper is focused on the synthesis of ZnO‐NPs mediated by Adiantum capillus‐veneris L. leaf extract and assesses their potential biological activities. In this study, ZnO‐NP is synthesized using A. capillus‐veneris L. leaf extract. The synthesized nanoparticles are characterized using, UV–vis spectroscopy, energy‐dispersive X‐ray spectroscopy (EDX), (SEM) scanning electron microscopy, X‐ray diffraction (XRD), and Fourier transform infrared (FT‐IR) spectrophotometry. The antibacterial, antifungal, anti‐inflammatory, and antioxidant properties of the formulated ZnO‐NPs are also inspected. The UV–vis, XRD, SEM, EDX, and FTIR confirmed the formation and purity of synthesized ZnO‐NPs. The ZnO‐NPs exhibit efficient antimicrobial potency against Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus, Aspergillus niger, and Aspergillus fumigatus. Gram‐positive bacteria, particularly S. aureus, are more susceptible to ZnO‐NPs, with the largest inhibition zone of 32 mm. In contrast, E. coli and P. aeruginosa display smaller inhibition zones of 25 and 27 mm respectively. Anti‐inflammatory tests show that ZnO‐NPs have a significant anti‐inflammatory effect against egg albumin and bovine serum albumin denaturation, possess low toxicity on erythrocytes, and are highly hemocompatible.
近年来,氧化锌因其独特的性质和优势特征,在氧化锌纳米颗粒(ZnO-NP)的绿色合成方面备受关注。本文主要研究以 Adiantum capillus-veneris L. 叶提取物为媒介合成 ZnO-NPs 并评估其潜在的生物活性。本研究使用 A. capillus-veneris L. 叶提取物合成 ZnO-NP。使用紫外-可见光谱、能量色散 X 射线光谱(EDX)、扫描电子显微镜(SEM)、X 射线衍射(XRD)和傅立叶变换红外(FT-IR)分光光度法对合成的纳米粒子进行了表征。此外,还检测了配制的 ZnO-NPs 的抗菌、抗真菌、抗炎和抗氧化特性。紫外可见光、XRD、扫描电镜、EDX 和傅立叶变换红外光谱证实了合成 ZnO-NPs 的形成和纯度。ZnO-NPs 对大肠杆菌、铜绿假单胞菌、金黄色葡萄球菌、黑曲霉和烟曲霉表现出高效的抗菌效力。革兰氏阳性菌,尤其是金黄色葡萄球菌,对 ZnO-NPs 更敏感,最大抑菌区为 32 毫米。相比之下,大肠杆菌和绿脓杆菌的抑制区较小,分别为 25 毫米和 27 毫米。抗炎测试表明,ZnO-NPs 对鸡蛋白蛋白和牛血清白蛋白变性有显著的抗炎作用,对红细胞的毒性低,且具有很高的血液相容性。
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引用次数: 0
Green Synthesis and Antimicrobial Study on Jujube Seed Extract Functionalized Ag Nanoparticles 枣籽提取物功能化银纳米粒子的绿色合成与抗菌研究
IF 2.7 4区 材料科学 Q2 Physics and Astronomy Pub Date : 2024-04-26 DOI: 10.1002/ppsc.202400012
Jiashen Fan, Han Song, Shengkai Liu, Boyu Chen, Yujie Fu, Zhiguo Liu
Green synthesis of Ag nanoparticles (AgNPs) by using the plant extract is a very important strategy to gain efficient antimicrobial agents with strong antimicrobial activity and low toxicity. In this study, jujube seed extract (JSE) is utilized to green synthesis of AgNPs by both hydrothermal process and solution‐based approaches. UV–vis absorption spectroscopy and infrared spectroscopy (FTIR) spectra confirm that jujube seed extract functionalized Ag nanoparticles are formed by both approaches and jujube seed extract covered on the surface of Ag nanoparticles. Transmission electron microscopy (TEM) images indicate that the JSE‐AgNPs are spherical with the average diameter of 17.7 and 14.2 nm for the hydrothermal process and solution‐based approaches, respectively. X‐ray diffraction (XRD) results indicate that the JSE‐AgNPs prepared by both approaches have face‐centered cubic crystal structure. The antimicrobial activity test reveals that minimum inhibitory concentrations (MIC) of JSE‐AgNPs by the solution‐based method are 62.5, 125, and 62.5 µg mL−1 against Escherichia coli, Staphylococcus aureus, and Candida albicans, respectively. These results imply that the JSE‐AgNPs have potential to be developed as efficient antimicrobial agents.
利用植物提取物绿色合成银纳米粒子(AgNPs)是获得具有强抗菌活性和低毒性的高效抗菌剂的重要策略。本研究利用枣籽提取物(JSE),通过水热法和溶液法绿色合成 AgNPs。紫外-可见吸收光谱和红外光谱(傅立叶变换红外光谱)证实,这两种方法都形成了枣子提取物功能化的银纳米粒子,且枣子提取物覆盖在银纳米粒子表面。透射电子显微镜(TEM)图像显示,水热法和溶液法得到的 JSE-AgNPs 均为球形,平均直径分别为 17.7 纳米和 14.2 纳米。X 射线衍射(XRD)结果表明,两种方法制备的 JSE-AgNPs 都具有面心立方晶体结构。抗菌活性测试表明,溶液法制备的 JSE-AgNPs 对大肠杆菌、金黄色葡萄球菌和白色念珠菌的最小抑菌浓度(MIC)分别为 62.5、125 和 62.5 µg mL-1。这些结果表明,JSE-AgNPs 具有开发成高效抗菌剂的潜力。
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引用次数: 0
Versatile Approach to Self‐Assembly of Surface Modified Nanoparticles into SERS‐Active Nanoclusters 将表面修饰的纳米粒子自组装成 SERS 活性纳米团簇的多功能方法
IF 2.7 4区 材料科学 Q2 Physics and Astronomy Pub Date : 2024-04-15 DOI: 10.1002/ppsc.202400034
Min Zhang, Jie Liu, Xun Li, Xiaoyu Zhao, Zhiqun Cheng, Tian‐Song Deng
A versatile method is invented to self‐assemble gold nanoparticles (GNPs) into nanoclusters (NCs) of various morphologies. By storing the particles in toluene, a highly non‐polar solvent, under conditions that ensure particle stability, the success rate of subsequent assembly can be enhanced. Additionally, conducting particle self‐assembly at a stirring speed of 200 rpm allows the NCs to maintain a spherical shape. The relative standard deviation (RSD) of Raman spectral peaks of multiple NCs used as surface‐enhanced Raman spectroscopy (SERS) substrates is calculated to be less than 10%, effectively addressing the issue of low repeatability when using NCs as SERS substrates. Furthermore, even at an analyte concentration reduced to 10−9 m, a SERS characteristic peak intensity of approximately 2 × 103 is measurable, demonstrating the high sensitivity of the assembled structures. Finally, by detecting SERS signals from NCs of varying sizes, the intensities of characteristic peaks tend to converge, eliminating the influence of morphology and size on SERS detection.
发明了一种将金纳米粒子(GNPs)自组装成各种形态的纳米团簇(NCs)的多功能方法。在确保颗粒稳定性的条件下,将颗粒储存在高非极性溶剂甲苯中,可提高后续组装的成功率。此外,以每分钟 200 转的搅拌速度进行颗粒自组装可使 NC 保持球形。根据计算,用作表面增强拉曼光谱(SERS)基底的多个 NC 的拉曼光谱峰的相对标准偏差(RSD)小于 10%,从而有效解决了将 NC 用作 SERS 基底时重复性低的问题。此外,即使分析物浓度降低到 10-9 m,也能测量到约 2 × 103 的 SERS 特征峰强度,这证明了组装结构的高灵敏度。最后,通过检测不同尺寸 NC 的 SERS 信号,特征峰的强度趋于一致,消除了形态和尺寸对 SERS 检测的影响。
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引用次数: 0
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Particle & Particle Systems Characterization
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