A ratiometric electrochemical sensor for dopamine detection based on hierarchical manganese dioxide nanoflower/multiwalled carbon nanotube nanocomposite modified glassy carbon electrode

A ratiometric electrochemical sensor for dopamine detection based on hierarchical manganese dioxide nanoflower/multiwalled carbon nanotube nanocomposite modified glassy carbon electrode
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基于分级二氧化锰纳米花/多壁碳纳米管纳米复合修饰玻碳电极的多巴胺比率电化学传感器

DOI:
10.1016/j.jallcom.2019.06.124
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发表时间:
2019-09
影响因子:
6.2
通讯作者:
Qianfen Zhuang
Qianfen Zhuang
中科院分区:
材料科学2区
文献类型:
--
作者:
Yong Wang;Luyao Wang;Qianfen Zhuang

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基于分级二氧化锰(MnO2)纳米花/多壁碳纳米管(MWCNT)纳米复合修饰玻碳电极(GCE),开发了一种用于多巴胺检测的比率电化学传感器。将分层MnO2纳米花电沉积到经过电化学预处理的多壁碳纳米管(MWCNT/EPGCE)修饰的GCE上,制备了内参比电化学探针。通过扫描电子显微镜、能量色散X射线光谱、X射线光电子能谱、循环伏安法和电化学阻抗谱对MnO2/MWCNT/EPGCE电极的制备过程进行了表征。 MWCNT的引入不仅可以改善多巴胺的电化学信号,还可以增加MnO2信号。使用电化学技术合理地解释了多巴胺和二氧化锰双重信号增强的起源。结果表明,MnO2/MWCNT/EPGCE 上多巴胺检测的高灵敏度主要源于多巴胺的高表面覆盖度,MnO2 在 MWCNT/EPGCE 上的信号增强归因于 MWCNT 对电沉积 MnO2 的电催化活性和 MnO2 表面覆盖度的增加。这种基于MnO2/MWCNT/EPGCE的传感器具有0.17μM的低检测限和0.5至30.0μM的宽线性范围。此外,该传感器具有选择性高、重现性好、稳定性好的特点,可应用于人血清样品中的多巴胺检测,结果满意。
A ratiometric electrochemical sensor is developed for dopamine detection based on hierarchical manganese dioxide (MnO2) nanoflower/multiwalled carbon nanotube (MWCNT) nanocomposite modified glassy carbon electrode (GCE). The hierarchical MnO2nanoflower was electrodeposited onto the electrochemically pretreated GCE modified with MWCNT (MWCNT/EPGCE) to prepare an inner reference electrochemical probe. The fabrication process of the MnO2/MWCNT/EPGCE electrode was characterized by scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, cyclic voltammetry, and electrochemical impedance spectroscopy. The introduction of MWCNT can not only improve the electrochemical signals of dopamine, but also increase MnO2signals. The origin of the dual signal enhancement for both dopamine and MnO2is reasonably explained by using electrochemical techniques. The results show that the high sensitivity for dopamine detection at MnO2/MWCNT/EPGCE predominately originates from the high surface coverage of dopamine, and the signal enhancement of MnO2on MWCNT/EPGCE is ascribed to the electrocatalytic activity of MWCNT towards the electrodeposited MnO2and the increase of MnO2surface coverage. This sensor based on MnO2/MWCNT/EPGCE has a low detection limit of 0.17 μM and a wide linear range from 0.5 to 30.0 μM. In addition, the sensor displays high selectivity, good reproducibility, and good stability, and can be applied for dopamine detection in human serum samples with satisfactory results.
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发表时间: 2018-10
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