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Enhanced sensitivity in non-enzymatic glucose detection by improved growth kinetics of Ni-based nanostructures

机译：通过改善基于Ni的纳米结构的生长动力学来增强非酶促葡萄糖检测的敏感性

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摘要

Ni-based nanostructures are attractive catalytic materials for many electrochemical applications, among which are non-enzymatic sensing, charge storage, and water splitting. In this work, we clarify the synthesis kinetics of Ni(OH)(2)/NiOOH nanowalls grown by chemical bath deposition at room temperature and at 50 degrees C. We applied the results to non-enzymatic glucose sensing, reaching a highest sensitivity of 31 mA cm(-2)mM(-1). Using scanning electron microscopy, x-ray diffraction analysis and Rutherford backscattering spectrometry we found that the growth occurs through two regimes: first, a quick random growth leading to disordered sheets of Ni oxy-hydroxide, followed by a slower growth of well-aligned sheets of Ni hydroxide. A high growth temperature (50 degrees C), leading mainly to well-aligned sheets, offers superior electrochemical properties in terms of charge storage, charge carrier transport and catalytic action, as confirmed by cyclic voltammetry and electrochemical impedance spectroscopy analyses. The reported results on the optimization and application of low-cost synthesis of these Ni-based nanostructures have a large potential for application in catalysis, (bio)sensing, and supercapacitors areas.
机译：Ni基的纳米结构可用于许多电化学应用，其中有非酶检测，电荷存储和水分解吸引力的催化材料。在这项工作中，我们阐明Ni的合成动力学（OH）（2）/ NiOOH的纳米墙通过化学浴沉积在室温下和在50℃下生长，我们施加的结果，以非酶葡萄糖感测，达到的最高灵敏度31毫安厘米（-2）MM（-1）。使用扫描电子显微镜，X-射线衍射分析和卢瑟福背散射光谱法，我们发现，通过两种机制的生长：第一，一个快速的随机生长导致的Ni氧 - 氢氧化物的无序片，随后良好对准的片材的生长较慢的氢氧化镍。高生长温度（50℃），导致主要是良好对准的片材，在电荷存储，电荷载体传输和催化作用方面提供优异的电化学特性，如通过循环伏安法和电化学阻抗谱分析证实。在优化和这些镍基纳米结构的低成本合成中的应用报告的结果有催化应用，（生物）传感和超级电容器领域的潜力很大。

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