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Hierarchical ZnO nanorods/Ni(OH)(2) nanoflakes for room-temperature, cheap fabrication of non-enzymatic glucose sensors

机译:ZnO分层纳米棒/ Ni(OH)(2)纳米薄片用于非酶葡萄糖传感器的室温廉价制造

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摘要

Hierarchical nanostructures composed of Ni(OH)(2) nanoflakes on ZnO nanorods (NRs) are fabricated by a low-cost, fully chemical method at room-temperature. The morphological features of the ZnO NRs were varied (by changing the chemical bath deposition parameters) in terms of height and lateral size. ZnO NRs provide a large surface area substrate for the pulsed electrodeposition of nanostructured Ni(OH)(2). The correlation between the synthetic parameters, the final structure and the electrochemical behavior of Ni(OH)(2)/ZnO nanostructures is investigated. The enzyme-free oxidation of glucose at the surface of electrodeposited Ni(OH)(2) is demonstrated in 0.1 M NaOH, revealing that a proper choice of the electrodes fabrication conditions improves the glucose sensitivity up to 1.85 mA cm(-2) mM(-1), with a linear detection range of 0.04-2.10 mM. All the samples show a fast response time (less than 1 s), resistance in chloride solution, selectivity in the presence of common interfering electroactive species and excellent long-term stability. All these features, combined with the ease of the fabrication method, make Ni(OH)(2)/ZnO nanostructures an ideal alternative for inexpensive amperometric glucose sensing applications.
机译:ZnO纳米棒(NRs)上的Ni(OH)(2)纳米薄片组成的分层纳米结构是通过低成本,完全化学方法在室温下制备的。 ZnO NRs的形态特征在高度和横向尺寸方面有所不同(通过改变化学浴沉积参数)。 ZnO NRs为纳米结构化Ni(OH)(2)的脉冲电沉积提供了大表面积的基材。研究了Ni(OH)(2)/ ZnO纳米结构的合成参数,最终结构与电化学行为之间的相关性。在电沉积的Ni(OH)(2)的表面的葡萄糖的无酶氧化证明在0.1M NaOH中,揭示的电极制造条件的适当选择改进了葡萄糖灵敏度高达1.85毫安厘米(-2)毫(-1),线性检测范围为0.04-2.10 mM。所有样品均显示出快速的响应时间(小于1 s),在氯化物溶液中的电阻,在常见的干扰电活性物质存在下的选择性以及出色的长期稳定性。所有这些功能,再加上制造方法的简便性,使Ni(OH)(2)/ ZnO纳米结构成为廉价安培型葡萄糖传感应用的理想选择。

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