Ni/CdS Bifunctional Ti@TiO2 Core-Shell Nanowire Electrode for High-Performance Nonenzymatic Glucose Sensing
Ni/CdS Bifunctional Ti@TiO2 Core-Shell Nanowire Electrode for High-Performance Nonenzymatic Glucose Sensing
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DOI：
10.1021/ac4034467
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发表时间：
2014-01-07
影响因子：
7.4
通讯作者：
Li, Hulin
中科院分区：
文献类型：
--
作者：
Guo, Chunyan;Huo, Huanhuan;Li, Hulin
本文采用水热电沉积法制备了Ni/CdS双功能Ti@TiO2核壳纳米线电极，该电极具有良好的电化学传感性能。采用场发射扫描电子显微镜（FESEM）和透射电子显微镜（TEM）对合成过程进行了表征。结果表明，Ni和TiO 2之间的CdS层对高分散Ni纳米粒子在Ti@TiO2核壳纳米线表面的均匀成核和后续生长起着重要作用。将该双功能纳米结构电极应用于葡萄糖的电化学非酶传感器。在优化的条件下，这种非酶葡萄糖传感器显示出高达1136.67 μ A mM（-1）cm（-2）的高灵敏度，0.005-12 mM的较宽的线性范围，和0.35 μ M的葡萄糖氧化的检测下限。Ni纳米颗粒的高分散性，结合CdS在光激发下的自清洁能力对中间体的抗中毒能力，被认为是这些增强的电化学性能的原因。重要的是，由于强大的框架，还获得了良好的再现性和长期性能。所有这些结果表明，这种新型电极是一个有前途的候选非酶葡萄糖传感。
In this work, a Ni/CdS bifunctional Ti@TiO2 core-shell 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-shell 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 mu A mM(-1) cm(-2), a wider liner range of 0.005-12 mM, and a lower detection limit of 0.35 mu 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.