共查询到20条相似文献,搜索用时 15 毫秒
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S. Roux P. Audebert J. Pagetti M. Roche 《Journal of Sol-Gel Science and Technology》2003,26(1-3):435-439
Conducting polymer based hybrid materials were synthesized by a new route. The use of pyrrole derivatives functionalized by a carboxylic acid or a -diketone group allows to control the polymerization rate of zirconium tetrapropoxide (Zr(OPr)4). The organic species entrapped in the resulting hybrid materials yield conducting polymers by electropolymerization. The results show that the formation of the conducting polymers depends on the nature of the monomer. Moreover, the presence of polysiloxane chains within the hybrid materials improves the properties of the latter. 相似文献
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本征型导电高分子抗静电剂是目前发现的使用效果最好的抗静电剂之一.本文简要综述了本征型导电高分子抗静电剂的工作原理、特点、国内外发展现状及发展趋势,其中重点介绍了聚(3,4 二氧乙基噻吩)/聚对苯乙烯磺酸,以及它在感光材料中作为抗静电剂显示的重要作用. 相似文献
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Label‐Free Photoelectrochemical Detection of Double‐Stranded HIV DNA by Means of a Metallointercalator‐Functionalized Electrogenerated Polymer 下载免费PDF全文
Fatima Haddache Dr. Alan Le Goff Bertrand Reuillard Dr. Karine Gorgy Dr. Chantal Gondran Dr. Nicolas Spinelli Prof. Eric Defrancq Dr. Serge Cosnier 《Chemistry (Weinheim an der Bergstrasse, Germany)》2014,20(47):15555-15560
The design of photoactive functionalized electrodes for the sensitive transduction of double‐stranded DNA hybridization is reported. Multifunctional complex [Ru(bpy‐pyrrole)2(dppn)]2+ (bpy‐pyrrole=4‐methyl‐4′‐butylpyrrole‐2,2′‐bipyridine, dppn=benzo[i]dipyrido[3,2‐a:2′,3′‐c]phenazine) exhibiting photosensitive, DNA‐intercalating, and electropolymerizable properties was synthesized and characterized. The pyrrole groups undergo oxidative electropolymerization on planar electrodes forming a metallopolymer layer on the electrode. Thanks to the photoelectrochemical and intercalating properties of the immobilized RuII complex, the binding of a double‐stranded HIV DNA target was photoelectrochemically detected on planar electrodes. Photocurrent generation through visible irradiation was correlated to the interaction between double‐stranded DNA and the metallointercalator polymer. These interactions were well fitted by using a Langmuir isotherm, which allowed a dissociation constant of 2×106 L mol?1 to be estimated. The low detection limit of 1 fmol L?1 and sensitivity of 0.01 units per decade demonstrate excellent suitability of these modified electrodes for detection of duplex DNA. 相似文献
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Jakub Haberko Joanna Raczkowska Andrzej Bernasik Wojciech Łużny Jakub Rysz Andrzej Budkowski 《Macromolecular Symposia》2008,263(1):47-52
Summary: In the present work knowledge the authors tried to direct the phase separation process in a thin polymer composite film to manufacture a polymer pattern via self organisation of the blend components. The Au substrate was modified by applying with a PDMS stamp a pattern of alternating stripes of a self-assembled monolayer. This in turn influenced the microstructure of the blend, allowing for the production of elongated domains repeating the pattern of the substrate. The blends studied in this work contained conducting polyaniline doped with camphorsulfonic acid or diphenyl phosphate and polystyrene. The role of the dopant was to induce electrical conductivity in polyaniline as well as to improve its solubility in common organic solvents. The microstructure of thin films was analysed using atomic force microscopy (AFM), dynamic secondary ion mass spectroscopy (dSIMS) and optical microscopy. 相似文献
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Ming Wei Junseok Lee Bongwoo Kang Joey Mead 《Macromolecular rapid communications》2005,26(14):1127-1132
Summary: Core‐sheath nanofibers with conductive polyaniline as the core and an insulating polymer as the sheath were prepared by electrospinning of blends of polyaniline with either polystyrene or polycarbonate. These unique core‐sheath structures offer potential in a number of applications including nanoelectronics. When polyaniline was blended with poly(methyl methacrylate) and poly(ethylene oxide), only isolated domains of polyaniline in beadlike structures were formed. The phase morphology of electrospun fibers is thought to be dependent on the high‐surface tension of the solution and the molecular weight of the polymers. Incompatibility of the polymers and low molecular weight of compositions played a key role in the formation of core‐sheath structures, as opposed to co‐continuous morphologies.
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用电聚合的方法在金电极上制备了以妥拉苏林为模板分子的自组装邻氨基硫酚分子印迹膜传感器.通过差分脉冲伏安法研究传感器对妥拉苏林的响应特性,结果表明在优化的实验条件下,此传感器的峰电流响应值与妥拉苏林浓度在0.4~5μg·mL-1(r=0.9986)和5~120μg·mL-1(r=0.9953)范围内保持良好的线性关系,检测限为0.18μg·mL-1;相对标准偏差约为2.47%,响应时间约为3min.传感器具备较好的选择性和稳定性,初步用于人体尿液中妥拉苏林的分析,获得了较满意的结果. 相似文献
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This paper described a novel electrochemical DNA biosensor for rapid specific detection of nucleic acids based on the sulfonated polyaniline (SPAN) nanofibre and cysteamine-capped gold nanoparticle (CA-GNP) layer-by-layer films. A precursor film of 3-mercaptopropionic acid (MPA) was firstly self-assembled on the Au electrode surface. CA-GNP was covalently deposited on the Au/MPA electrode to obtain a stable substrate. SPAN nanofibre and CA-GNP were alternately layer-by-layer assembled on the stable substrate by electrostatic force. Cyclic voltammetry was used to monitor the consecutive growth of the multilayer films by utilizing [Fe(CN)6]3−/4− as the redox indicator. The (CA-GNP/SPAN)n films showed satisfactory ability of electron transfer and excellent redox activity in neutral media. Negatively charged probe ssDNA was immobilized on the outer layer of the multilayer film (CA-GNP) through electrostatic affinity. Chronopotentiometry and electrochemical impedance spectroscopy were employed to obtain the direct electrochemical readout for probe ssDNA immobilization and hybridization using [Fe(CN)6]3−/4− in solution as the mediator. While electrochemical impedance spectroscopy led to the characterization of the electron-transfer resistance at the electrode, chronopotentiometry provided the total resistance at the interfaces of the modified electrodes. A good correlation between the total electrode resistances and the electron-transfer resistances at the conducting supports was found. Chronopotentiometry was suggested as a rapid transduction means (a few seconds). Based on the (CA-GNP/SPAN)n films, the target DNA with 20-base could be detected up to 2.13 × 10−13 mol/L, and the feasibility for the detection of base-mismatched DNA was also demonstrated. 相似文献
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《Analytical letters》2012,45(3):467-482
Abstract This paper describes a reagentless electrochemical DNA biosensor applied to the detection of human immunodeficiency virus (HIV) sequences based on electrochemical impedance spectroscopy (EIS). The novel DNA biosensor has been elaborated by means of an opposite‐charged adsorption Au‐Ag nanocomposite to a conductive polymer polypyrrole (PPy) modified platinum electrode (Pt) and self‐assembly the mercapto oligonucleotide probes onto the surface of modified electrode via the nanocomposite. The duplex formation was detected by measuring the electrochemical impedance signal of nucleic acids in phosphate buffer solution (PBS). Such response is based on the concomitant conductivity changes of the PPy film and nanocomposite. The reagentless scheme has been characterised using 21‐mer synthetic oligonucleotides as models: parameters affecting the hybridization assay were explored and optimized. The detection limit is 5.0×10?10 M of target oligonucleotides at 3σ. The potential for development of reagentless DNA hybridization analysis in the clinical diagnosis is being pursued. 相似文献
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本文总结了含聚氧化乙烯(PEO)链段的聚合物网络快离子导体的研究工作,论述了这类聚合物电解质的离子导电性与网络结构的关系,并讨论了离子在其中的传递历程.通过研究聚合物网络电介质所获得的众多基本概念,同样可用于解释在PEO类高分子快离子导体研究中所发现的实验现象. 相似文献
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Nanostructured polyaniline (PANI) conducting polymer films were prepared on electrochemically pretreated glassy carbon electrodes, which were previously modified with multilayers of polystyrene (PS) nanoparticles with a diameter of 100 nm. PANI was electropolymerised and grown through the interstitial spaces between the PS nanoparticles, which formed a nanocomposite film of PANI and PS nanoparticles on the electrode surface. Furthermore, a nanoporous PANI film was fabricated through the removal of the PS nanoparticles by dissolution in toluene. As a result of their nanostructure, both of the PANI films (before and after removal of the PS nanoparticles) exhibited enhanced electrocatalytic behaviour towards the reduction of nitrite relative to bulk-PANI films; however, partial collapse or shrinkage may have occurred with the removal of the nanoparticles and could have resulted in a less enhanced response. Under optimised conditions, the nanocomposite-film-modified electrode exhibited a fast response time of 5 s and a linear range from 5.0 x 10(-7) to 1.4 x 10(-3) M for the detection of nitrite; the detection limit was 2.4 x 10(-7) M at a signal-to-noise ratio of 3. 相似文献
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Conducting/electroactive polypyrrole polymers are synthesized electrochemically on glassy carbon in various electrolytes (counterions). The polymers' electroactivity is measured using cyclic voltammetry. The electrolytes are chloride, nitrate, p-toluene sulfonate, dodecyl sulfate, and dodecylbenzenesulfonate of sodium and potassium ferrocyanide. It is found that the electrolyte (dopant) markedly affects the redox behavior of the polypyrrole films. 相似文献
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Ignacio Gonzlez M. Eugenia Muoz Antonio Santamaría J. Adolfo Pomposo Hans Grande Javier Rodríguez‐Parra 《Macromolecular rapid communications》2002,23(12):659-663
An improved method, based on mechanical stirring and a controlled solvent evaporation process, is proposed to obtain PANI(CSA)0.5/m‐cresol solutions, which lead to gels with conductivities in the range 3 to 150 S/cm, preserving the elasticity associated to the gel network. Such high conductivity values have only been found for brittle films cast from PANI solutions. According to our experimental results, there is no justification for an analogy between the elastic modulus and the conductivity of physical networks. 相似文献