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首页> 外文期刊>RSC Advances >Nickel clusters grown on three-dimensional graphene oxide-multi-wall carbon nanotubes as an electrochemical sensing platform for luteolin at the picomolar level
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Nickel clusters grown on three-dimensional graphene oxide-multi-wall carbon nanotubes as an electrochemical sensing platform for luteolin at the picomolar level

机译：在三维氧化石墨烯-多壁碳纳米管上生长的镍簇作为皮摩尔级木犀草素的电化学传感平台

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摘要

This study focuses on enhancing the catalytic activity of metallic Ni by using various nanostructured carbon materials, including 1D multi-wall carbon nanotubes (MWCNTs), 2D graphene oxide (GO) and graphene (GR), and 3D graphene oxide-multi-wall carbon nanotubes (GO-MWCNTs) as supporting matrices for the fabrication of an electrochemical sensor for detecting the flavonoid luteolin. Ni clusters were prepared by a facile electrochemical approach and the metallic Ni on various carbon supports exhibited different morphologies, which were characterized by scanning electron microscopy (SEM) and Raman spectra. The electrocatalytic performance of Ni-based materials towards luteolin oxidation was studied by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). It was found that Ni clusters supported on GO-MWCNTs (Ni/GO-MWCNTs) were profoundly superior to other carbon materials, with a greatly enhanced current. This is attributed not only to the excellent electric conductivity and large surface-to-volume ratio of Ni/GO-MWCNTs, but also to the unique 3D carbon nanostructure that facilitates the easy access of the electrolyte and analyte to the modified electrode surface and promotes the reaction kinetics. Under the optimal conditions, the anodic peak current was linear to the concentration of luteolin in the range from 1 pM to 15 mu M with a detection limit of 0.34 pM (S/N = 3). The good analytical performance, low cost and straightforward preparation method made this novel electrode material promising for the development of an effective luteolin sensor.
机译：这项研究的重点是通过使用各种纳米结构的碳材料来增强金属Ni的催化活性，包括一维多壁碳纳米管（MWCNT），2D氧化石墨烯（GO）和石墨烯（GR）以及3D氧化石墨烯-多壁碳纳米管（GO-MWCNTs）作为支撑基质，用于制造用于检测类黄酮木犀草素的电化学传感器。 Ni团簇通过简便的电化学方法制备，各种碳载体上的金属Ni表现出不同的形貌，通过扫描电子显微镜（SEM）和拉曼光谱表征。通过循环伏安法（CV）和微分脉冲伏安法（DPV）研究了镍基材料对木犀草素氧化的电催化性能。发现GO-MWCNTs（Ni / GO-MWCNTs）上负载的Ni团簇显着优于其他碳材料，并且电流大大增加。这不仅归因于Ni / GO-MWCNTs的出色电导率和大的表面积/体积比，还归因于独特的3D碳纳米结构，该结构有助于电解质和分析物易于进入修饰的电极表面并促进反应动力学。在最佳条件下，阳极峰值电流与木犀草素浓度在1 pM至15μM范围内呈线性关系，检出限为0.34 pM（S / N = 3）。良好的分析性能，低成本和简便的制备方法使这种新型电极材料有望用于开发有效的木犀草素传感器。

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