自组装单分子膜的制备及其在电分析化学中的应用

综述了自组装修饰电极在电分析化学中的应用。     

金属氧化物修饰电极的制备及最新应用

论述了金属氧化物修饰电极的制备方法,对近几年其在环境污染物处理、电分析化学、电合成及与其它方法联用等方面的应用进行了综述。指出了金属氧化物修饰电极研究中存在的问题,并展望了其发展方向与应用前景。     

超微电极的新进展

超微电极是当前电化学前沿领域和研究热点之一。本文主要介绍了超微电极的基本原理、种类和特点 ,并结合国际上超微电极的最新研究现状 ,介绍了超微修饰电极的特点及其在电分析化学中的应用 ;超微电极在扫描探针显微学、固态电化学、生物细胞体内检测和分析化学等方面中的应用。     

肾上腺素在二苯并18冠6修饰玻碳电极上的伏安特性

化学修饰电极自20世纪70年代中期问世以来，很快成为电化学和电分析化学十分活跃的研究领域。1967年Pedersen等报道了冠醚化合物后，冠醚化学及其应用引起了广大化学工作者的重视。冠醚在毛细管电泳和高效液相色谱中的应用已有不少报道，但冠醚在修饰电极方面研究报道并不多，冠醚修饰电极有的是采用组合法将冠醚与电极材料混合制成糊状电极；有的是用电沉积法将冠醚修饰在玻碳电极或铂电极上。     

氧化铟锡薄膜电极的表面修饰

氧化铟锡(ITO)薄膜电极具有良好的物理(导电性高、透光性好)和化学性能,对其表面进行修饰可进一步拓展其在电分析化学中的应用。该文根据目前的研究现状,简要介绍了ITO薄膜电极的制备和清洗方法,总结了ITO薄膜电极的表面修饰方法,着重介绍了应用较多的化学吸附、硅烷化、电化学接枝3类方法,并简要评述了ITO薄膜电极表面修饰方法面临的挑战及应用前景。     

碳纳米管修饰电极在生命电分析化学中的应用进展

本文综述了近年来碳纳米管修饰电极在生命电分析化学中的应用进展,主要包括在神经递质、蛋白质、核酸以及其它与生命相关的小分子上的电化学研究,并展望了其应用前景。     

聚乙烯二茂铁修饰电极测定抗坏血酸

化学修饰电极是近几年来活跃于电化学及电分析化学领域的一个新的研究课题,成功地应用于表面配位化学、光电转化、表面催化反应及痕量元素检测等方面。具有电活性的聚乙烯二茂铁修饰电极对抗坏血酸的氧化有催化作用。     

中国化学会 中国金属学会 中国仪器仪表学会第六届全国电分析化学学术会议征文通知

中国化学会、中国金属学会和中国仪器仪表学会拟定于1996年9月在青岛联合召开第六届全国电分析化学学术会议,并委托青岛化工学院等单位筹办、现将会议征文及有关事项通知如下:一、征文内容1.电分析化学基础理论2.电分析新技术新方法新仪器3.电极表面修饰及表征     

《化学修饰电极》征订启事

本书以化学和相关边缘科学为基础,结合现代电化学和电分析化学的最新发展,系统地介绍了化学修饰电极的由来、表面分子设计与制备、表征方法、膜内的电荷传输、电极过程动力学、功能与效应及其在生物传感器、蛋白质的电子转移、流动体系和分析中的应用,展望了化学修饰电极的发展前景,并以近期受到关注的无机膜和聚合物膜修饰电极另列章节分别论述。 本书是著者以中国科学院长春应用化学研究所电分析化学开放实验室多年的化学修饰电极研究工作为基础写成的。概述了国际上有关的最新研成果,便于读者了解该领域的前沿和发展方向。在叙述上…     

纳米级普鲁士蓝的制备表征及其在电分析化学中的应用

普鲁士蓝(PB)可以作为许多生物化学物质的人工酶来修饰惰性电极,用来催化它们的氧化还原.该文评述了近年来国内外对纳米尺度PB在电分析化学领域中的应用进展,含纳米PB的基本特性、制备方法、电极固定,以及在电分析化学中的应用.纳米PB对检测信号有放大作用,已经在电分析中体现了它的优越性,对纳米PB的深入研究将开发出性能更优良的传感器.     

功能聚吡咯膜修饰电极的制备及其应用

本文对功能聚吡咯膜修饰电极的制备及其在电化学催化、电化学释放、分子器件、电变色效应、生物传感器以及电化学分析等方面的应用进行了综述,引参考文献五十篇。     

Hydrogen peroxide sensing at MnO2/carbonized nanostructured polyaniline electrode

Manganese dioxide modified carbonized nanostructured polyaniline (MnO₂/Carb-nanoPANI) was prepared via a novel hydrothermal procedure. The synthesized material was characterized using XRD, SEM and TG-DTA analysis. Furthermore, MnO₂/Carb-nanoPANI was examined as electrode material for potential application in the field of electroanalysis. It showed a high electrocatalytic activity for the sensing of hydrogen peroxide in an aqueous media.     

Chemically Stripping Analysis of Copper with Modified Graphite Paste Electrode

Modified electrodes have been popularly used in electroanalysis. Chemically stripping analysis (CSA) with modified electrodes, however, was few in past years⑴.In this paper, we present a new method for determination of copper, chemically stripping analysis with glutathione modified graphite paste electrode (GMGPE).     

Electrocatalytic Oxidation of Dithionite at a Cobalt(II)tetrasulfonated Phthalocyanine and 5,10,15,20‐Tetrakis‐(4‐sulfonatophenyl)porphyrin Cobalt(II) Modified Gold Electrode in Alkaline Solution

In this paper it is shown that the charge transfer kinetics of the oxidation of sodium dithionite at a gold electrode in alkaline solution can be increased by modifying this electrode with cobalt(II)tetrasulfonated phthalocyanine, sodium salt (CoTSPc) or 5,10,15,20‐tetrakis‐(4‐sulfonatophenyl)porphyrin cobalt(II), tetrasodium salt (CoTSPor). Electrodeposition of these catalysts is discussed as well as the oxidation of sodium dithionite at these immobilized catalysts. Despite an observed acceleration in the charge transfer kinetics, sodium dithionite is still oxidized irreversibly. However, the improvement in kinetics has beneficial consequences in the field of electroanalysis of sodium dithionite. Comparison of the oxidation at bare gold and modified gold electrodes showed that with improved charge transfer kinetics at the modified electrodes a higher sensitivity and selectivity and a much lower detection limit is obtained.     

Tantalum Electrodes Modified With Well-Aligned Carbon Nanotube–Au Nanoparticles: Application to the Highly Sensitive Electrochemical Determination of Cefazolin

Carbon nanotube/nanoparticle hybrid materials have been proven to exhibit high electrocatalytic activity suggesting broad potential applications in the field of electroanalysis. For the first time, modification of Ta electrode with aligned multi-walled carbon nanotubes/Au nanoparticles introduced for the sensitive determination of the antibiotic drug, cefazolin (CFZ). The electrochemical response characteristics of the modified electrode toward CFZ were investigated by means of cyclic and linear sweep voltammetry. The modified electrode showed an efficient catalytic activity for the reduction of CFZ, leading to a remarkable decrease in reduction overpotential and a significant increase of peak current. Under optimum conditions, the highly sensitive modified electrode showed a wide linear range from 50 pM to 50 μM with a sufficiently low detection limit of 1?±?0.01 pM (S/N?=?3). The results indicated that the prepared electrode presents suitable characteristics in terms of sensitivity (458.2?±?2.6 μAcm^?2/μM), accuracy, repeatability (RSD of 1.8 %), reproducibility (RSD of 2.9 %), stability (14 days), and good catalytic activity in physiological conditions. The method was successfully applied for accurate determination of trace amounts of CFZ in pharmaceutical and clinical preparations without the necessity for samples pretreatment or any time-consuming extraction or evaporation steps prior to the analysis.     

Self-assembled monolayers of 2-mercaptobenzimidazole on gold: stripping voltammetric determination of Hg(II)

Monomolecular level modification of electrode surfaces through a self-assembly approach is, of late, gaining importance in view of its many functional applications in areas such as molecular electronics, molecular recognition, electron transfer studies and electroanalysis. Self-assembled monolayer (SAM) modification of a gold electrode with 2-mercaptobenzimidazole (MBI) has been achieved. On this modified electrode, anodic stripping voltammetric determination of mercury at ppm/sub-ppm level concentrations has been successfully attempted. Pre-concentration, prior to stripping, has been effected through a non-electrolytic process involving chemical interactions between MBI and Hg(II). The results are described and discussed with a plausible scheme.     

Overoxidized polypyrrole doped with 4,5-dihydroxy-3-(p-sulfophenylazo)-2,7-naphthalene disulfonic acid as a selective and regenerable film for the stripping detection of copper(II).

A conducting polymer modified electrode based on the incorporation of 4,5-dihydroxy-3-(p-sulfophenylazo)-2,7-naphthalene disulfonic acid, SPADNS, as an anionic complexing ligand into polypyrrole film during electropolymerization was prepared. The electroanalysis of copper(II) in this modified electrode was achieved by medium exchange and differential pulse voltammetry. Copper ions were accumulated from ammonia buffer on the electrode surface by the formation of a chemical complex at open circuit. The resulting electrode with complexed Cu(2+) was then transferred to an acetate buffer and subjected to anodic stripping voltammetry. The analytical performance was evaluated and, finally, linear calibration graphs were obtained in the concentration range of 2 - 250 ng ml(-1) for Cu(II). The detection limit was found to be 1.1 ng ml(-1) and RSD was obtained at 3.1 and 1.9% for two different concentrations. Many coexisting metal ions had little or no effect on the determination of copper. The developed method was applied to Cu(II) determination in natural water and human hair samples. Also, the rapid and convenient regeneration of electrode allows the use of a single modified electrode in multiple analyses.     

Electroanalytical Applications of Microporous Zeolites and Mesoporous (Organo)Silicas: Recent Trends

Microporous zeolites and ordered mesoporous (organo)silicas have been widely used as electrode modifiers because of their attractive properties (ion exchange and size selectivity of zeolites, well ordered nanoreactors containing a high number of widely accessible active centers in mesoporous (organo)silicas). These properties have been intelligently combined to selected redox processes to improve the response of the resulting modified electrodes or to design novel electrochemical detection schemes. This up‐to‐date review provides the recent advances made in the electroanalytical applications of zeolite modified electrodes and discusses the interest of ordered mesoporous (organo)silica materials in electroanalysis.     

Functionalized Carbon Nanoparticles,Blacks and Soots as Electron‐Transfer Building Blocks and Conduits

Functionalized carbon nanoparticles (or blacks) have promise as novel active high‐surface‐area electrode materials, as conduits for electrons to enzymes or connections through lipid films, or as nano‐building blocks in electroanalysis. With previous applications of bare nanoblacks and composites mainly in electrochemical charge storage and as substrates in fuel cell devices, the full range of benefits of bare and functionalized carbon nanoparticles in assemblies and composite (bio)electrodes is still emerging. Carbon nanoparticles are readily surface‐modified, functionalized, embedded, or assembled into nanostructures, employed in bioelectrochemical systems, and incorporated into novel electrochemical sensing devices. This focus review summarizes aspects of a rapidly growing field and some of the recent developments in carbon nanoparticle functionalization with potential applications in (bio)electrochemical, photoelectrochemical, and electroanalytical processes.     

Platinum Nanoparticles/Poly(isoleucine) Modified Glassy Carbon Electrode for the Simultaneous Determination of Hydroquinone and Catechol

A new electrochemical sensor based on Poly(Isoleucine) modified glassy carbon electrode decorated with platinum nanoparticles (Pt/Poly(Isoleucine)/GCE) was developed for sensitive individual and simultaneous determination of hydroquinone (HQ) and catechol (CC). Scanning electron microscopy (SEM), Electrochemical impedance spectroscopy (EIS), Cyclic voltammetry (CV) and Differential pulse voltammetry (DPV) were performed in order to characterize the Pt/Poly(Isoleucine)/GCE nanocomposite. For simultaneous determination of HQ and CC, Pt/Poly(Isoleucine)/GCE showed wide linear range between the 0.01–100.0 μM. The detection limits were 0.006 μM for HQ and 0.005 μM for CC. The Pt/Poly(Isoleucine)/GC electrode exhibited good sensitivity and reliability in the simultaneous electroanalysis of two isomers in PBS of pH 7.5. The modified electrode was used to detect the isomers in naturel samples.