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首页> 外文期刊>RSC Advances >Multi-walled carbon nanotubes decorated with palladium nanoparticles as a novel platform for electrocatalytic sensing applications
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Multi-walled carbon nanotubes decorated with palladium nanoparticles as a novel platform for electrocatalytic sensing applications

机译：装饰有钯纳米颗粒的多壁碳纳米管，作为电催化传感应用的新型平台

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摘要

A simple method is described for decorating multi-walled carbon nanotubes (MWCNTs) with palladium nanoparticles (PdNPs). MWCNTs were functionalized via a C-C covalent bond with metformin (Met/fMWCNT). The subsequent bonding of the imine groups with palladium offered strong adhesion of PdNPs on functionalized MWCNT surface (Pd@Met/fMWCNT). The structure and morphology of the resulting MWCNT-based nanocomposite were characterized by transmission electron microscopy, X-ray diffraction and FT-IR. Pd@Met/fMWCNT nanocomposite was used to immobilize glucose oxidase (GOx) on glassy carbon electrode. Detailed electrochemical analysis was performed and it was found that Pd@Met/fMWCNT nanocomposite significantly improved direct electron transfer between GOx and glassy carbon electrode, leading to fabrication of a potential biosensor offering very sensitive detection of glucose. The surface coverage of GOx and the electron transfer rate constant (k(s)) were calculated to be 4.17 x 10(-10) mol cm(-2) and 3.24 s(-1), respectively. The apparent Michaelis-Menten constant of the immobilized GOx was 0.48 mM, implying a strong catalytic activity and a remarkable affinity of the immobilized GOx for glucose. The linear detection range of glucose was 4.0-1500 mu M, with a detection limit of 1.4 +/- 0.04 mu M.
机译：描述了一种用钯纳米粒子（PdNP）装饰多壁碳纳米管（MWCNT）的简单方法。 MWCNT通过二甲双胍（Met / fMWCNT）的C-C共价键官能化。亚胺基团随后与钯的键合提供了PdNP在功能化MWCNT表面（Pd @ Met / fMWCNT）上的强粘附力。通过透射电子显微镜，X射线衍射和FT-IR表征了所得的基于MWCNT的纳米复合材料的结构和形态。 Pd @ Met / fMWCNT纳米复合材料用于将葡萄糖氧化酶（GOx）固定在玻璃碳电极上。进行了详细的电化学分析，发现Pd @ Met / fMWCNT纳米复合材料显着改善了GOx和玻璃碳电极之间的直接电子转移，从而导致了潜在的生物传感器的制造，该传感器可对葡萄糖进行非常灵敏的检测。 GOx的表面覆盖率和电子传输速率常数（k（s））分别计算为4.17 x 10（-10）mol cm（-2）和3.24 s（-1）。固定的GOx的表观Michaelis-Menten常数为0.48mM，这表明固定的GOx对葡萄糖具有强的催化活性和显着的亲和力。葡萄糖的线性检测范围为4.0-1500μM，检测极限为1.4 +/- 0.04μM。

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