稀土配位聚合物荧光材料的应用研究进展

稀土配位聚合物因其结构多样性、可调控性以及在荧光、磁性、气体吸附与分离和荧光探针等领域的潜在应用成为当前的研究热点。文章详细地综述了近年来稀土配位聚合物荧光材料在温度传感、白光发射和荧光传感等领域的应用研究进展。最后,对稀土配位聚合物荧光材料的应用前景进行了总结和展望。     

SWCNTs的制备及其在生物传感器中的应用前景

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。     

高荧光量子产率碳量子点的绿色制备及光学特性

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...     

电纺纳米纤维膜荧光传感器在重金属检测中的应用

概述了静电纺丝纳米纤维膜荧光传感器的传感原理;根据传感方式的不同,静电纺丝纳米纤维膜荧光传感器可分为淬灭型、增强型和比率型,综述了这3种荧光传感器在重金属离子检测方面的研究进展;最后对静电纺丝纳米纤维膜荧光传感器的前景进行了展望。     

汞离子荧光传感的研究进展

荧光传感提供了方便,快捷,廉价的分析检测重金属离子的方法,并具有很高的灵敏度和选择性。它在环境科学,分析化学以及生命科学等领域有着广泛的应用前景。综述了Hg2+荧光传感的最新研究进展,并展望了该领域的发展趋势。     

含氟硫杂杯芳烃衍生物的合成及其对铅离子的荧光传感性质研究

合成了5-全氟正己基-硫杂杯[4]芳烃R1,并用1H NMR核磁共振和19F NMR核磁共振进行了初步表征。荧光光谱实验研究了R1对Ca2+、Fe3+、Eu3+和Pb2+等金属离子的荧光传感行为。结果表明,R1对Pb2+离子表现出很好的荧光响应和良好的选择性。     

石墨氮化碳在荧光探针中的应用研究进展

石墨氮化碳(g-C_3N_4)是近年来发现的一种新型的荧光材料,不含任何有毒金属元素,在生物成像、生物传感等领域具有潜在的应用。对g-C_3N_4在检测重金属离子、易爆炸物、生物分子和生物成像等荧光探针方面的应用进行了综述,并对其今后的发展前景和应用进行了展望。     

多孔荧光配位聚合物的研究进展

多孔配位聚合物(Porous Coordination Polymer,PCP),是一种在无机材料科学和配位化学交叉领域出现的新材料。可通过调节配体来调节配位聚合物的结构与性能,同时可将具有生色基团的有机配体引入骨架,构筑的化合物骨架兼有多孔和荧光性质。故在气体吸附,分子识别,磁性和催化以及在光捕获和化学传感器等领域具有潜在应用。本文简要介绍了当前多孔配位聚合物在荧光传感性能及其应用方面的研究进展,并对MOFs在化学荧光传感方面的应用发展进行了展望。     

发光金属有机框架材料在环境检测中的研究进展

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。     

发光金属有机骨架材料及其荧光传感应用

发光金属有机骨架(LMOFs)具有发光位点丰富、易于多功能修饰、发光波长范围广等优势,在荧光分析应用方面具有潜在的应用价值。本文重点介绍了LMOFs材料的三种发光类型及其荧光传感方式,综述了近年来LMOFs材料在检测小分子、p H和温度的荧光检测应用。     

荧光共轭聚合物的结构设计与合成方法研究

荧光共轭聚合物既有机小分子荧光材料优良的光学品质,又具有高分子材料优越的可加工性能,成为了荧光材料的研究热点。因此,荧光共轭聚合物在开发新型化学、生物及爆炸物传感器等方面具有非常广阔的应用前景。本文介绍了几种典型的荧光聚合物,重点介绍了聚合物中荧光发色团的合成,从分子结构设计、应用及优缺点等方面对各种合成方法进行阐述比较。并且展望了今后荧光共轭聚合物的发展前景。     

荧光共轭聚合物传感器的应用

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。     

Water‐soluble fluorescent nanoparticles without distinct aggregation of conjugated polymer chains

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     

Fluorescence Intensity Modulation in Photochromic Conjugated Polymer Systems

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.     

Fluorescent polyelectrolytes as protein sensors

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     

Conjugated Polymers with Aggregation-Induced Emission Characteristics for Fluorescence Imaging and Photodynamic Therapy

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.     

Segmented conjugated polymer based on poly(α-thiophenediyl)benzylidine

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.     

Facile enzymatic preparation of fluorescent conjugated polymers of phenols and their application in sensing

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.     

利用水溶性共轭高分子检测DNA的研究进展

文章介绍了利用水溶性共轭高分子的光信号放大的特点,以荧光为检测手段,对核酸进行特异性识别的生物传感器。主要介绍了DNA的两种检测方法,并研究了影响荧光共振能量传递效率的一些因素。     

Synthesis and characterization of some novel conjugated polyoxadiazoles with Schiff base structure

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.