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首页> 外文期刊>Nanotechnology >Mesoporous nickel oxide nanostructures: influences of crystalline defects and morphological features on mediator-free electrochemical monosaccharide sensor application
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Mesoporous nickel oxide nanostructures: influences of crystalline defects and morphological features on mediator-free electrochemical monosaccharide sensor application

机译：中孔镍氧化纳米结构：结晶缺陷和形态特征对无硅胶电化学单糖传感器应用的影响

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摘要

Morphological and surface features are the key tools used to tune the catalytic performance of any metal oxide. In the present study, nickel oxide nanoparticles (NiO NPs) with three different morphologies were prepared using a simple hydrothermal method. The electrocatalytic performance of the prepared NiO NPs was evaluated with regard to the detection of monosaccharide glucose. The physicochemical properties of prepared NiO nanostructures were confirmed using different conventional characterization techniques. The flower-like morphological NiO NPs with nanosized petals have a high surface area and a more defective surface, resulting in improved heterogeneous catalytic activity compared to hexagonal and spherical morphological NiO NPs in glucose oxidation. The anionic and cationic vacancies on the mesoporous surface of NiO nanopetals endorsed an enhanced charge transfer efficiency compared to other NiO morphologies. The effect of scan rate, confirmed by cyclic voltammetry analysis, ensured the diffusion-controlled quasi-reversible electrochemical reaction between surface-modified electrodes and analyte. The NiO petals showed a wide linear detection range (100 nmol L-1-12 mmol L-1) and a lower detection limit of 57 nmol L-1. In addition, the anti-interference ability, repeatability, stability and real sample analysis further affirmed the enhanced catalytic features of NiO nanopetals. The results showed that defective surfaces and surface features of the NiO nanostructures could be used to tune their overall sensor performance in future applications.
机译：形态学和表面特征是用于调节任何金属氧化物的催化性能的关键工具。在本研究中，使用简单的水热法制率制备具有三种不同形态的氧化镍纳米颗粒（NiO NPS）。关于检测单糖葡萄糖的检测评价制备的NIO NP的电催化性能。使用不同的常规表征技术确认制备的NIO纳米结构的物理化学性质。具有纳米瓣的花样形态NiO NPS具有高表面积和更缺陷的表面，与葡萄糖氧化中的六边形和球形形态NiO NP相比，改善的异质催化活性。与其他NIO形态相比，NiO纳米纳米纳米纳米型介孔表面上的阴离子和阳离子空位概述了增强的电荷转移效率。通过循环伏安分析证实的扫描速率的影响确保了表面改性电极和分析物之间的扩散控制的准可逆电化学反应。 NIO花瓣显示出宽的线性检测范围（100nmol L-1-12mmol L-1）和57nmol L-1的较低检测限。此外，抗干扰能力，可重复性，稳定性和实际样品分析进一步肯定了NIO纳米纳米纳米纳米型催化特征的增强。结果表明，NIO纳米结构的缺陷表面和表面特征可用于在未来的应用中调整它们的整体传感器性能。

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