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排序方式: 共有227条查询结果,搜索用时 31 毫秒
71.
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运用电位分辨电致化学发光 (PRECL)手段发现Ru(bpy) 2 + 3 C2 O2 -4 PtE体系在预氧化的多晶铂电极上存在两个发光通道 ,这两个通道分别位于 1.2 2V和 1.40V处 .对影响两发光通道的条件进行了研究 ,比较了几种经过不同预处理方式 (直接抛光、阳极极化和阴极极化的电极以及S吸附电极 )以及体系中不同C2 O2 -4 浓度 ,pH ,溶解氧和溶解二氧化碳对两PRECL峰形、峰强度的影响 .提出第二个ECL发光峰的机制为C2 O2 -4 直接电极氧化产物CO2 -·(或C2 O4 -·)的催化发光 . 相似文献
73.
Isabel Díez Dr. Matti Pusa Sakari Kulmala Prof. Hua Jiang Dr. Andreas Walther Anja S. Goldmann Axel H. E. Müller Prof. Olli Ikkala Prof. Robin H. A. Ras Dr. 《Angewandte Chemie (International ed. in English)》2009,48(12):2122-2125
Colorful clusters : Silver nanoclusters consisting of only a few atoms exhibit large chemical‐environment‐responsive shifts of their optical absorption and emission bands, that is, large solvatochromism (see picture). The photophysical characteristics and electrochemiluminescence of the Ag clusters give them remarkable advantages over larger nanoparticles in applications such as molecular sensing.
74.
Wei H Liu J Zhou L Li J Jiang X Kang J Yang X Dong S Wang E 《Chemistry (Weinheim an der Bergstrasse, Germany)》2008,14(12):3687-3693
[Ru(bpy)3]2+-doped silica (RuSi) nanoparticles were synthesized by using a water/oil microemulsion method. Stable electrochemiluminescence (ECL) was obtained when the RuSi nanoparticles were immobilized on a glassy carbon electrode by using tripropylamine (TPA) as a coreactant. Furthermore, the ECL of the RuSi nanoparticles with layer-by-layer biomolecular coatings was investigated. Squential self-assembly of the polyelectrolytes and biomolecules on the RuSi nanoparticles gave nanocomposite suspensions, the ECL of which decreased on increasing the number of bilayers. Moreover, factors that affected the assembly and ECL signals were investigated. The decrease in ECL could be assigned to steric hindrance and limited diffusion of the coreactant molecules in the silica matrix after they were attached to the biomolecules. Since surface modification of the RuSi nanoparticles can improve their biocompatibility and prevent leaking of the [Ru(bpy)3]2+ ions, the RuSi nanoparticles can be readily used as efficient and stable ECL tag materials in immunoassay and DNA detection. 相似文献
75.
电化学发光(ECL)兼备电化学和化学发光的特点,灵敏度高、线性范围宽、背景干扰小,得到了广大分析科学研究者的关注;传统的ECL材料虽然发光效率高,但仍存在价格昂贵、负载量低等缺点。g-C3N4是一种不含金属的半导体纳米材料,主要以三嗪环或七嗪环为基本结构单元,通过层间的范德华力以及层内的C—N共价键结合,构成类石墨的二维层状结构,具有性质稳定、能带结构独特、生物兼容性好、环保无毒、易于功能化、原料价廉、制备过程简单等优点。自2012年g-C3N4首次被发现具备ECL的性能,至今已被广泛应用到ECL中。本文根据ECL的发光机理、传感器的作用效果、传感的信号类型以及不同的检测对象进行了分类,综述了近年来g-C3N4在ECL传感器构建中的研究进展,并阐述了g-C3N4在ECL发展中存在的挑战和前景。 相似文献
76.
Yingying Zhao Hong Chen Qiong Chen Yantao Qi Fan Yang Jie Tang Pingang He Fan Zhang 《中国化学》2014,32(11):1161-1168
An ultrasensitive and signal‐on electrochemiluminescence (ECL) aptasensor to detect target protein (thrombin or lysozyme) was developed using the host‐guest recognition between a metallocyclodextrin complex and single‐stranded DNA (ss‐DNA). The aptasensor uses both the photoactive properties of the metallocyclodextrins named multi‐tris(bipyridine)ruthenium(II)‐β‐cyclodextrin complexes and their specific recognition with ss‐DNA, which amplified the ECL signal without luminophore labeling. After investigating the ECL performance of different multi‐tris(bipyridine)ruthenium(II)‐β‐cyclodextrin (multi‐Ru‐β‐CD) complexes, tris‐tris(bipyridine)‐ruthenium(II)‐β‐cyclodextrin (tris(bpyRu)‐β‐CD) was selected as a suitable host molecule to construct an atasensor. First, double‐stranded DNA (ds‐DNA) formed by hybridization of the aptamer and its target DNA was attached to a glassy carbon electrode via coupling interaction, which showed low ECL intensity with 2‐(dibutylamino) ethanol (DBAE) as coreactant, because of the weak recognition between ds‐DNA and tris(bpyRu)‐β‐CD. Upon addition of the corresponding protein, the ECL intensity increased when target ss‐DNA was released because of the higher stability of the aptamer‐protein complex than the aptamer‐DNA one. A linear relationship was observed in the range of 0.01 pmol/L to 100 pmol/L between ECL intensity and the logarithm of thrombin concentrations with a limited detection of 8.5 fmol/L (S/N=3). Meanwhile, the measured concentration of lysozyme was from 0.05 pmol/L to 500 pmol/L and the detection limit was 33 fmol/L (S/N=3). The investigations of proteins in human serum samples were also performed to demonstrate the validity of detection in real clinical samples. The simplicity, high sensitivity and specificity of this aptasensor show great promise for practical applications in protein monitoring and disease diagnosis. 相似文献
77.
The Sensitized Solid‐Phase Electrochemiluminescence of Electrodeposited Poly‐Luminol/Aniline on AuAg/TiO2 Nanohybrid Functionalized Electrode for Flow Injection Analysis 下载免费PDF全文
In this study, a copolymer of luminol with aniline is electrochemically deposited onto the AuAg/TiO2 nanohybrid functionalized indium tin oxide coated glass. It is used as a reagentless electrochemiluminescent (ECL) electrode for flow‐injection‐analysis (FIA). The properties of this solid phase ECL electrode are characterized by cyclic voltammetry, electrochemical impedance spectroscopy and scanning electron microscopy etc. It has stronger ECL emission, sensitive response for target analytes and excellent stability. The so‐prepared ECL electrode shows sensitive response to reactive oxygen species thereafter to be applied for determination of hydrogen peroxide with FIA mode. Under optimized conditions, a mass detection limit of 0.822 pg of hydrogen peroxide was obtained. Thus the hydrogen peroxide residues in samples were detected with satisfactory result. 相似文献
78.
Electrochemiluminescence Detection of TNT by Resonance Energy Transfer through the Formation of a TNT–Amine Complex 下载免费PDF全文
Wenjing Qi Min Xu Lei Pang Zhongyuan Liu Wei Zhang Saadat Majeed Prof. Dr. Guobao Xu 《Chemistry (Weinheim an der Bergstrasse, Germany)》2014,20(16):4829-4835
2,4,6‐Trinitrotoluene (TNT) is a widely used nitroaromatic explosive with significant detrimental effects on the environment and human health. Its detection is of great importance. In this study, both electrochemiluminescence (ECL)‐based detection of TNT through the formation of a TNT–amine complex and the detection of TNT through electrochemiluminescence resonance energy transfer (ECRET) are developed for the first time. 3‐Aminopropyltriethoxysilane (APTES)‐modified [Ru(phen)3]2+ (phen=1,10‐phenanthroline)‐doped silica nanoparticles (RuSiNPs) with uniform sizes of (73±3) nm were synthesized. TNT can interact with APTES‐modified RuSiNPs through charge transfer from electron‐rich amines in the RuSiNPs to the electron‐deficient aromatic ring of TNT to form a red TNT–amine complex. The absorption spectrum of this complex overlaps with the ECL spectrum of the APTES‐modified RuSiNPs/triethylamine system. As a result, ECL signals of the APTES‐modified RuSiNPs/triethylamine system are turned off in the presence of TNT owing to resonance energy transfer from electrochemically excited RuSiNPs to the TNT–amine complex. This ECRET method has been successfully applied for the sensitive determination of TNT with a linear range from 1×10?9 to 1×10?6 M with a fast response time within 1 min. The limit of detection is 0.3 nM . The method exhibits good selectivity towards 2,4‐dinitrotoluene, p‐nitrotoluene, nitrobenzene, phenol, p‐quinone, 8‐hydroxyquinoline, p‐phenylenediamine, K3[Fe(CN)6], Fe3+, NO3?, NO2?, Cr3+, Fe2+, Pb2+, SO32?, formaldehyde, oxalate, proline, and glycine. 相似文献
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