共查询到20条相似文献,搜索用时 93 毫秒
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SWCNTs独特的电子结构和几何形状赋予了它独特的荧光特性,具有良好的生物相容性和优异的光学性质,还具有高度均匀性以及小孔缺陷,易于处理。因此,它们被广泛应用于生物医学成像、生物传感和药物输送领域。本文对SWCNTs的制备及在荧光生物传感器方向的应用研究进展进行了综述,并对其应用前景进行展望。 相似文献
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碳量子点(CQDs)作为一种新型碳纳米材料,具有良好的水溶性、低毒性、生物相容性、荧光特性,并且易于修饰,使其在荧光标记、离子检测、生物传感、能源转换等领域展现出良好的应用前景.本研究以菠菜叶为碳源,采用简单、绿色、环境友好的一步水热法制备了CQDs.利用透射电子显微镜(TEM)、X射线衍射(XRD)、X射线光电子能谱... 相似文献
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随着工业化、农业化水平的提高,大量污染物的产生严重危害了自然界生态平衡,并且增加了人类面临各种健康问题的风险。开发一种灵敏、稳定、快速、便捷的新型检测方法,对于环境监测具有重要意义。发光金属有机框架材料(Luminescent metal-organic frameworks, LMOFs)兼具了MOFs材料孔隙率高、比表面积大、易于结构修饰等特点和光致发光特性,在荧光传感方面展现出灵敏度高、选择性好、检测范围宽和抗干扰性能强等优点,因而在环境检测领域表现出良好的应用前景。主要介绍了LMOFs的发光类型和发光机理,然后评述了近年来LMOFs对环境中金属离子、无机物、有机物的荧光传感的研究进展,并对LMOFs的发展前景进行了展望。 相似文献
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荧光共轭聚合物传感器的应用 总被引:1,自引:1,他引:0
介绍了共轭聚合物的荧光信号放大机理,综述了近年来作为传感器的荧光共轭聚合物的应用研究进展,以及共轭聚合物作为基材的传感器的种类、共轭聚合物在传感器方面面临的问题及研究方向。 相似文献
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Guangwei Zhang Xiaomei Lu Yunyun Wang Yanqin Huang Quli Fan Wei Huang 《Polymer International》2011,60(1):45-50
In a previous study, we reported water‐soluble light‐emitting nanoparticles with distinct interchain aggregation states of the constituent conjugated polymers. These interchain states usually result in strong self‐quenching, dramatically reducing the quantum efficiency of fluorescence. In the work reported in the present study, we developed new water‐soluble fluorescent nanoparticles without distinct aggregation of the conjugated polymer chains, which demonstrated distinctive morphologies and optical properties. ‘Strawberry’ morphologies of the nanoparticles were directly observed using transmission electron microscopy. The conjugated polymers were dispersed in the individual cores of the nanoparticles and the majority of the core diameters were in the range 8–12 nm. The primary optical properties of the conjugated polymers in tetrahydrofuran still remained in the nanoparticles. The results suggest that the conjugated polymer chains formed a possible unimolecular structure without distinct aggregation in the nanoparticles. Copyright © 2010 Society of Chemical Industry 相似文献
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Elizabeth J. Harbron 《Israel journal of chemistry》2013,53(5):256-266
The ability to modulate fluorescence intensity with a light signal enables a variety of applications based on fluorescence imaging. One approach to fluorescence photomodulation involves using a photochromic moiety that responds to a light signal in conjunction with a nearby fluorophore. We employ conjugated polymers based on poly(p-phenylene vinylene) (PPV) as the fluorophore in photochrome-fluorophore systems for fluorescence modulation. Advantages of using conjugated polymers for this purpose include their intrinsic energy migration processes that enable amplified fluorescence quenching as well as their processability. Here we present examples of PPV-based photomodulation systems that employ photochromic dyes from three common photochromic families: azobenzenes, spironaphthoxazines, and diarylethenes. In all cases we observe reversible fluorescence quenching due to fluorescence resonance energy transfer to the photogenerated form of the photochrome. Examples of the photomodulation of photochromic PPV systems in organic solution, polymer films, and conjugated polymer nanoparticles are presented. 相似文献
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Ashootosh Vasant Ambade Britto Selvaraj Sandanaraj Akamol Klaikherd S Thayumanavan 《Polymer International》2007,56(4):474-481
This review discusses recent advances in protein sensing using fluorescent polyelectrolytes that are mainly water‐soluble conjugated polymers. A quencher‐labeled substrate or fluorophore‐labeled substrate is generally used as a probe. In the presence of an enzyme, the linker between substrate and quencher/fluorophore is cleaved and fluorescence of the polymer is either ‘turned on’ or ‘turned off’. Fluorescence behavior of these conjugated polymers is highly sensitive to conformation of the polymeric chains. Since upon binding with proteins the conformation is perturbed and fluorescence is affected, these polyelectrolytes have been used to study conformational changes in proteins. The conformation‐dependent fluorescence is also a limitation for these sensors in some cases and non‐conjugated polyelectrolytes have been shown to provide an alternative. Copyright © 2006 Society of Chemical Industry 相似文献
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Accurate diagnosis and treatment have been extensively developed in the field of biomedicine, which put forward higher requirements for the development of biomedical materials with high efficiency and selectivity. Among them, conjugated polymers featuring aggregation-induced emission (AIE) characteristics (AIE conjugated polymers) have stood out in recent years owing to their unique properties, such as intense solid emission, high light-harvesting ability, efficient energy transfer, and high 1O2 generation ability, which empower them with effective biomedical functions in fluorescence imaging (FLI), photodynamic therapy (PDT), FLI-guided PDT, two-photon excited photodynamic therapy (2PE-PDT), etc. In this review, we highlight recent progress in AIE conjugated polymers and their applications in anticancer and antibacterial areas based on FLI and PDT, and summarize the mechanism of color-tuned fluorescence emission and efficient 1O2 generation ability. The challenges and perspectives for the future development of AIE conjugated polymers are also discussed. 相似文献
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Summary Segmented polymers with random sequences of conjugated and non-conjugated blocks are produced by partial dehydrogenation of poly(-thiophenediyl)benzylidene. The fraction of conjugated block was controlled by the elimination time. The polymers gave photoluminescence. Absorption coefficients of the polymers increased with the rate of dehydrogenation, and the highest fluorescence intensity were achieved around 9 % conjugation conversion. The polymers were characterized by 1H- and 13C-n.m.r. and infrared spectra, and were soluble in common organic solvents, which suggests a good processability. 相似文献
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Facile enzymatic preparation of fluorescent conjugated polymers of phenols and their application in sensing
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Weeradech Kiratitanavit Ferdinando F. Bruno Jayant Kumar Ramaswamy Nagarajan 《应用聚合物科学杂志》2018,135(30)
The recognized drawback of utilizing metal catalysts for the synthesis of fluorescent conjugated polymers (CP) is the requirement for extensive purification to ensure complete removal of residual catalyst that would otherwise quench the fluorescence. In addition, typical synthesis of fluorescent CP involves multiple steps, monomers and solvents with varying levels of toxicity. This work demonstrates the possibility of utilizing oxidoreductase enzymes as the catalyst, for the one step polymerization of naturally occurring phenols to yield fluorescent conjugated polyphenols. The metal in the active site of the enzyme remains chelated during the synthesis allowing the polymers to be fluorescent as synthesized without the need for extensive purification. Three natural phenols, 4‐hydroxyphenylacetic acid, hydroxytyrosol, and chlorogenic acid were polymerized using Horseradish peroxidase as the biocatalyst. Spectroscopic techniques, UV–vis, Fourier transform infrared Spectroscopy–Attenuated Total Reflectance, and fluorescence, are used to characterize chemical structure and photoluminescence of these polymers. The polyphenols exhibit fluorescence with significant stokes shift in the range 30–100 nm rendering them useful in fluorescence quenching‐based sensors. Preliminary studies on use of these polymers, in the detection of nitro‐aromatic compounds in solution through using fluorescence‐quenching are also presented. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135, 46496. 相似文献
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Some novel conjugated polyoxadiazoles with Schiff base structure were efficiently synthesized through polycondensation of
4,4′-(1,3,4-oxadiazole-2,5-diyl)dianiline with some dialdehydes. The polymers were characterized by IR, 1H NMR, ultraviolet spectroscopy, fluorescence spectroscopy, gel permeation chromatography and thermal analyses. All polymers
have high thermal stability with decomposition temperature higher than 260 °C. Some polymers have good solubility in common
organic solvents. They also have strong absorptions at 294–345 nm, and strong emissions at 405–432 nm. 相似文献