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Platinum decorated carbon nanotubes for highly sensitive amperometric glucose sensing

机译：铂金修饰的碳纳米管，用于高度灵敏的电流法葡萄糖感应

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摘要

Fine platinum nanoparticles (1-5 nm in diameter) were deposited on functionalized multi-walled carbon nanotubes (MWNTs) through a decoration technique. A novel type of enzymatic Pt/MWNTs paste-based mediated glucose sensor was fabricated. Electrochemical measurements revealed a significantly improved sensitivity (around 52.7 mu A mM~(-1) cm~(-2)) for glucose sensing without using any picoampere booster or Faraday cage. In addition, the calibration curve exhibited a good linearity in the range of 1-28 mM of glucose concentration. Transmission electron microscopy (TEM) and x-ray photoelectron spectroscopy (XPS) were performed to investigate the nanoscale structure and the chemical bonding information of the Pt/MWNTs paste-based sensing material, respectively. The improved sensitivity of this novel glucose sensor could be ascribed to its higher electroactive surface area, enhanced electron transfer, efficient enzyme immobilization, unique interaction in nanoscale and a synergistic effect on the current signal from possible multi-redox reactions.
机译：通过装饰技术将精细的铂纳米颗粒（直径1-5 nm）沉积在功能化的多壁碳纳米管（MWNT）上。新型的酶Pt / MWNTs糊基于介导的葡萄糖传感器的制造。电化学测量结果表明，无需使用任何皮安级助推器或法拉第笼，即可显着提高对葡萄糖感测的灵敏度（约52.7μA mM〜（-1）cm〜（-2））。另外，校准曲线在1-28 mM的葡萄糖浓度范围内表现出良好的线性。进行了透射电子显微镜（TEM）和X射线光电子能谱（XPS），以分别研究Pt / MWNTs糊状传感材料的纳米级结构和化学键信息。这种新型葡萄糖传感器灵敏度的提高归因于其较高的电活性表面积，增强的电子转移，有效的酶固定，纳米级的独特相互作用以及对可能的多重氧化还原反应产生的电流信号的协同作用。

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