Ni/CdS Bifunctional Ti@TiO2 Core鈥揝hell Nanowire Electrode for High-Performance Nonenzymatic Glucose Sensing

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• 作者：Chunyan Guo ; Huanhuan Huo ; Xu Han ; Cailing Xu ; Hulin Li
• 刊名：Analytical Chemistry
• 出版年：2014
• 出版时间：January 7, 2014
• 年：2014
• 卷：86
• 期：1
• 页码：876-883
• 全文大小：464K
• ISSN：1520-6882

文摘

In this work, a Ni/CdS bifunctional Ti@TiO₂ core鈥搒hell nanowire electrode with excellent electrochemical sensing property was successfully constructed through a hydrothermal and electrodeposition method. Field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) were employed to confirm the synthesis and characterize the morphology of the as-prepared samples. The results revealed that the CdS layer between Ni and TiO₂ plays an important role in the uniform nucleation and the following growth of highly dispersive Ni nanoparticle on the Ti@TiO₂ core鈥搒hell nanowire surface. The bifunctional nanostructured electrode was applied to construct an electrochemical nonenzymatic sensor for the reliable detection of glucose. Under optimized conditions, this nonenzymatic glucose sensor displayed a high sensitivity up to 1136.67 渭A mM^鈥? cm^鈥?, a wider liner range of 0.005鈥?2 mM, and a lower detection limit of 0.35 渭M for glucose oxidation. The high dispersity of Ni nanoparticles, combined with the anti-poisoning faculty against the intermediate derived from the self-cleaning ability of CdS under the photoexcitation, was considered to be responsible for these enhanced electrochemical performances. Importantly, favorable reproducibility and long-term performance were also obtained thanks to the robust frameworks. All these results indicate this novel electrode is a promising candidate for nonenzymatic glucose sensing.