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首页> 外文期刊>Analytical chemistry >Poly(tetrafluoroethylene) Film Housing of Carbon Fibers Using Capillary- Pull Technology for One-Stage Fabrication of Carbon Disk Ultramicroelectrodes and Their Characterization
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Poly(tetrafluoroethylene) Film Housing of Carbon Fibers Using Capillary- Pull Technology for One-Stage Fabrication of Carbon Disk Ultramicroelectrodes and Their Characterization

机译：碳纤维聚（四氟乙烯）薄膜外壳的毛细管拉制技术一步法制备碳盘超微电极及其表征

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摘要

Fabrication and characterization of carbon disk ultramicroelectrodes (CDUMEs), embodied in a pulled Teflon capillary, with overall tip, dimension of ～10 /μm in .diameter, are described. A CDUME was constructed by inserting a carbon fiber 7/tm in diameter into a commercial Teflon capillary, which was followed by pulling the capillary by means of a microelectrode puller employing appropriate healing and timing, to produce a serf-sealing thin Teflon film insulation coating. Then, the so-coated carbon fiber was cut to expose a fresh carbon fiber disk. The proposed one-stage preparation method is fast (~5 min), very simple, and inexpensive and eliminates the need for separate embodying, insulation, and sealing steps. It results in CDUMEs exhibiting excellent electrochemical behavior. Scanning electron and optical microscopy, voltammetry, and amperometry were employed'" to characterize these electrodes. Cyclic voltammograms of ferricyanide in aqueous media and of ferrocene in acetonitrile media displayed low-noise, low-background, sigmoidal responses with virtually no current hysteresis. To check the analytical applicability of these electrodes, a testing with adrenaline was performed by applying the differential pulse voltammetry mode. A linear calibration over the concentration range from 2.5×10↑(-6)to 5.0 ×10↑(-4) mol/L, in pH 7.2 phosphate buffer solution was obtained with a detection limit of 7.0×10↑(-7) mol/L. The proposed CDUMEs with flexible and nonfragile Teflon housing exhibit very !ow electrical noise and can be reproduced multiple limes by simply recutting the tip.
机译：描述了碳盘超微电极（CDUME）的制造和表征，该碳盘超微电极体现在拉制的特氟隆毛细管中，总尖端直径约为10 /μm。通过将直径为7 / tm的碳纤维插入市售的聚四氟乙烯毛细管中来构建CDUME，然后通过采用适当的愈合和定时的微电极拉拔器拉动毛细管，以产生自密封的聚四氟乙烯薄膜绝缘涂层。然后，切割如此涂覆的碳纤维以暴露新的碳纤维盘。拟议的一步制备方法快速（〜5分钟），非常简单且便宜，并且不需要单独的实施，绝缘和密封步骤。结果导致CDUME表现出优异的电化学行为。使用扫描电子和光学显微镜，伏安法和安培计对这些电极进行表征。水性介质中铁氰化物和乙腈介质中二茂铁的循环伏安图显示低噪声，低背景，S形响应，几乎没有电流滞后。为了检查这些电极的分析适用性，采用差分脉冲伏安法进行了肾上腺素的测试，在2.5×10↑（-6）至5.0×10↑（-4）mol / L的浓度范围内进行了线性校准，在pH 7.2的磷酸盐缓冲溶液中，检出限为7.0×10↑（-7）mol / L。所提出的具有柔性且不易碎的聚四氟乙烯外壳的CDUME表现出极低的电噪声，并且可以通过简单地重新切割来复制多个石灰小费。

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