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染料修饰电极因其电化学响应大,稳定性好且制备简单,引起了人们广泛的研究兴趣,发展非常迅速。本文介绍了近年来染料修饰电极的制备及其应用情况,并对染料修饰电极的发展趋势作了展望。 相似文献
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采用循环伏安法研究了碳纳米管修饰玻碳电极对抗坏血酸的电催化活性。研究表明,碳纳米管修饰玻碳电极对抗坏血酸具有优异的电催化活性,与裸玻碳电极相比,抗坏血酸在该修饰电极上的氧化峰电位负移0.502 V,氧化峰电流增加78%;抗坏血酸浓度在1.0×10-5~0.1 mol/L范围内呈良好线性关系,最低检测限为1.0×10-6 mol/L。 相似文献
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本文的研究结果表明,碳纳米管修饰电极加快对乙酰氨基酚和抗坏血酸的电化学氧化。相比裸玻碳电极,碳纳米管修饰电极使PA的氧化峰负移113mV,电流增大3倍;AA的氧化电位负移126mV,电流增大4倍,且使PA和AA的氧化电位差达到344mV,PA和AA的氧化峰不再重叠,能够同时测定。PA和AA的检出限分别达到1.01×10-6mol.L-1和2.46×10-5mol.L-1。方法应用于药品的测定,结果满意。 相似文献
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Hongying Liu Guangfeng Wang Jinsong Hu Daolei Chen Wei Zhang Bin Fang 《应用聚合物科学杂志》2008,107(5):3173-3178
A new type of poly (thionine)/multiwall carbon nanotube/glassy carbon (PTH/MWNTs/GC) electrode was fabricated by electropolymerization thionine onto the surface of MWNTs modified GC electrode. The properties and behaviors of the modified electrode were characterized by scanning electron microscopy (SEM) and cyclic voltammetry (CV). The results show that the high sensitivity and selectivity are mainly caused by the unique carbon surface of the carbon nanotubes and the catalytic activity of thionine. The modified electrode exhibited excellent electrocatalytic behavior to the oxidation of uracil, and was firstly applied to determinate the concentration of uracil for the differential pulse voltammograms. Under the optimum conditions, linear calibration equation was obtained over the uracil concentration range from 1.0 × 10?5 to 5.5 × 10?2M with a correlation coefficient of 0.9978 and a detection limit 2.0 × 10?7M (based on S/N = 3) was also gained. The good electrocatalytic response of uracil at PTH/MWNTs/GC electrode suggests that the PTH/MWNTs are an excellent platform for electrochemical biosensing. The modified electrode displays excellent repeatability, stability, and high sensitivity. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008 相似文献
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碳纳米管上电沉积钯对乙醇的电催化氧化研究 总被引:1,自引:0,他引:1
采用电化学循环伏安法沉积Pd纳米颗粒,在碳纳米管(CNT)电极表面获得了粒径约为20 nm而且分散性良好的Pd纳米颗粒,而玻碳(GC)电极表面上Pd纳米颗粒趋向于堆积形成紧密的Pd金属薄膜。研究发现,在碱液中Pd/CNT电极对乙醇的催化活性要高于Pd/GC电极,而交流阻抗实验发现,Pd/GC电极的阻抗半圆明显大于碳纳米管,表明了Pd/CNT电极对乙醇的催化速率明显优于Pd/GC电极。不同Pd载量以及环境温度影响实验发现,Pd/CNT电极上峰电流的增长速率要明显大于Pd/GC电极,而不同乙醇浓度实验进一步表明,Pd/CNT电极对于乙醇浓度的响应要比Pd/GC的灵敏。 相似文献
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运用循环伏安法、线性扫描伏安法及示差脉冲伏安法等测试技术研究了诺氟沙星在多壁碳纳米管修饰玻碳电极上的电化学行为,建立了一种直接测定诺氟沙星的电化学分析方法.结果表明,与裸玻碳电极相比,多壁碳纳米管修饰电极能显著提高诺氟沙星的氧化峰电流.在优化的实验条件下,氧化峰电流与诺氟沙星浓度在1.0×10-7~1.0×10-6mol/L和1.0×10-6~2.5×10-5 moL/L范围呈现良好的线性关系,检出限为3.0×10-8mol/L对1.0×10-5mol/L诺氟沙星溶液平行测定10次的RSD为4.1%.测定了诺氟沙星胶囊中诺氟沙星的含量,结果满意. 相似文献
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Jinlei Zhang Dandan Zhao Shengwei Tan Zenwei Huang Yan Mi Zaiyin Huang 《Electrochimica acta》2010,55(7):2522-2526
A new method for the determination of nimesulide was established based on the multiwalled carbon nanotubes (MWCNTs) modified glassy carbon electrode (MWCNTs/GCE). In 0.2 M PBS (pH 6.6) buffer solution, the MWCNTs/GCE showed a remarkable catalytic and enhancement effect on reduction of the nimesulide. The reduction peak potential of nimesulide shifted positively from −0.665 V at bare GCE to −0.553 V at MWCNTs/GCE, and the sensitivity increased ca. 7 times. A linear dynamic range of 3.2 × 10−7-6.5 × 10−5 M (R = 0.9992) with a detection limit of 1.6 × 10−7 M was obtained. The electrochemical behaviors of nimesulide were studied and electron-transfer coefficient (α = 0.45), proton number (X = 1) and electron-transfer number (n = 2) have been determined. This method has been used to determine the content of nimesulide in medical tablets. The recovery was determined to be 93.2-106.2% by means of standard addition method. Compared with UV-vis spectrometry, the method was not remarkable difference. 相似文献
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综述了碳糊电极及化学修饰碳糊电极的发展、制备及表征,概括了近年来化学修饰碳糊电极在食品分析、药物分析、环境监测等领域的应用,并展望了其发展前景。 相似文献
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制备了羧化多壁碳纳米管/维生素B12修饰玻碳电极,利用循环伏安法研究了多巴胺(DA)在此修饰电极上的电化学行为。结果表明,在pH为6.48的PBS缓冲溶液中,此修饰电极对DA有很强的电催化作用,明显增强了峰电流,峰电位差ΔEp由196 mV减小至69 mV,提高了电极反应的可逆性。在优化实验条件下,此修饰电极所测DA氧化峰电流与DA浓度在1.0×10-5~5.0×10-5mol/L及1.0×10-3~1.0×10-2mol/L范围内均呈线性,线性方程分别为y=373.78x+71.726(R2=0.995 8)和y=57.2x+365.22(R2=0.986 6),其中低浓度区的相关系数较高,应用于实际样品测定时结果较为满意。检测限可达8.0×10-8mol/L。 相似文献