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首页> 外文期刊>Electroanalysis >Electrochemical Investigation of Glucose on a Highly Sensitive Nickel-Copper Modified Pencil Graphite Electrode
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Electrochemical Investigation of Glucose on a Highly Sensitive Nickel-Copper Modified Pencil Graphite Electrode

机译：高敏感镍铜改性铅笔石墨电极上的葡萄糖的电化学研究

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摘要

Novel nickel-copper modified pencil graphite electrode (Ni-Cu/PGE) was fabricated and used as non-enzymatic sensor for glucose determination. Ni and copper were electrodeposited on PGE using cyclic voltammetry. Morphology and composition of the modified PGE electrode were characterized by field-emission gun scanning electron microscopy (FEG-SEM), energy-dispersive X-ray spectroscopy (EDX) and Fourier transform infrared spectroscopy (FT-IR). Electrochemical oxidation of glucose was evaluated by cyclic voltammetry as well as by amperometry. Electrochemical measurements indicate that the Ni-Cu/PGE exhibits a high sensitivity of 2951 mu A mM(-1) cm(-2), and a low detection limit of 0.99 mu M which are, respectively, three times higher and twice lower than that on Ni/PGE prepared in the same conditions. Moreover, Ni-Cu/PGE exhibits a wider linear range from 1 to 10000 mu M with a rapid response time within 2 s. Moreover, Ni-Cu/PGE showed a remarkable stability. The electrode was successfully applied for determination of glucose concentration in human blood without significant interference from potential endogenic interferents. The good applicability of the elaborated sensor made Ni-Cu/PGE promising for the development of effective and inexpensive non-enzymatic glucose sensor.
机译：制备新型镍 - 铜改性的铅笔石墨电极（Ni-Cu / PGE）并用作葡萄糖测定的非酶促传感器。使用循环伏安法在PGE上电沉积Ni和铜。通过现场 - 发射枪扫描电子显微镜（FEG-SEM），能量分散X射线光谱（EDX）和傅里叶变换红外光谱（FT-IR）的形态和组成特征。通过循环伏安法以及Amperometry评估葡萄糖的电化学氧化。电化学测量表明，Ni-Cu / PGE表现出高灵敏度为2951μmmm（-1）cm（-2），并且分别为0.99μm的低检测限，比较高三倍，两倍于在相同条件下准备的NI / PGE上。此外，Ni-Cu / PGE在2秒内具有快速响应时间的较宽线性范围从1到10000μm。此外，Ni-Cu / PGE显示出显着的稳定性。将电极成功地应用于人血液中的葡萄糖浓度，而不会受到潜在内源性干扰的显着干扰。阐明的传感器的良好适用性使Ni-Cu / PGE对有效和廉价的非酶促葡萄糖传感器的开发有望。

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