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首页> 外文期刊>International Journal of Electrochemical Science >Langmuir-Blodgett films of Nafion-nitrogen Doped Carbon Nanotubes as New Sensing Materials for the Determination of Caffeine in Tea
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Langmuir-Blodgett films of Nafion-nitrogen Doped Carbon Nanotubes as New Sensing Materials for the Determination of Caffeine in Tea

机译：Nafion氮掺杂碳纳米管的Langmuir-Blodgett膜作为测定茶中咖啡因的新传感材料

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In this work, Langmuir?Blodgett (LB) technique was proposed to fabricate the homogeneous andcontrolled films of Nafion-nitrogen doped carbon nanotubes (Nafion-NCNTs). Microstructure andelectrochemical performance of LB films of Nafion-NCNTs was characterized by atomic forcemicroscopy (AFM) images, scanning electron microscopy (SEM) images and electrochemicalexperiments. Moreover, the LB film of Nafion-NCNTs was transferred to the surface of glassy carbon(GC) electrode to fabricate the electrochemical sensor to apply for determination of caffeine.Electrochemical experiments show that the LB films of Nafion-NCNTs modified GC electrode caneffectively increase electrochemical response of caffeine. Under the optimum conditions, the oxidationpeak current of caffeine was proportional to its concentration in the range of 8.0 × 10 -8 ~ 4.0 × 10 -6 molL -1 , with a detection limit of 2.0 × 10 -8 mol L -1 . And the modified GC electrode showed excellentselectivity, good stability and repeatability. It also was successfully used for determination of thecontent of caffeine in tea samples.
机译：在这项工作中，提出了Langmuir？Blodgett（LB）技术来制造Nafion-氮掺杂的碳纳米管（Nafion-NCNT）的均匀且可控的膜。通过原子力显微镜（AFM）图像，扫描电子显微镜（SEM）图像和电化学实验表征了Nafion-NCNTs LB膜的微观结构和电化学性能。此外，将Nafion-NCNTs的LB膜转移到玻璃碳（GC）电极的表面，以制备用于测定咖啡因的电化学传感器。电化学实验表明，Nafion-NCNTs修饰的GC电极的LB膜可以有效地提高电化学性能。咖啡因的反应。在最佳条件下，咖啡因的氧化峰电流与其浓度成正比，范围为8.0×10 -8〜4.0×10 -6 molL -1，检出限为2.0×10 -8 mol L -1。修饰后的GC电极具有优异的选择性，良好的稳定性和可重复性。它也已成功地用于测定茶叶样品中咖啡因的含量。

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