基于取代型多酸复合材料的多巴胺电化学检测
收稿日期: 2019-07-16
修回日期: 2019-12-13
网络出版日期: 2019-12-16
基金资助
河北科技大学博士启动基金No(81/1181222);大学生创新创业训练计划项目No(2018065);河北省高等学校科学技术研究项目No(ZD2018037);河北省高等学校科学技术研究项目No(QN2019032);与国家自然科学基金资助No(81872669)
Electrochemical Determination of Dopamine Based on Metal-Substituted Polyoxometalates Composites
Received date: 2019-07-16
Revised date: 2019-12-13
Online published: 2019-12-16
本文构建了基于取代型多酸与还原氧化石墨烯（RGO）复合材料的多巴胺电化学传感器. 首先,通过水热法合成了十一钨镍杂多钨硅酸盐K2H2SiW11NiO39·xH2O（SiW11Ni）,利用Hummers法与化学还原法合成了还原氧化石墨烯. 并使用SEM、XRD与FTIR等测试方法对材料进行了表征. 将SiW11Ni与RGO按照一定的比例滴涂在玻碳电极表面,以便成功构建出传感界面（SiW11Ni-RGO/GCE）. 然后,采用电化学阻抗法与循环伏安法等方法研究了传感界面的电化学性质. 优化实验条件后,利用该传感器通过循环伏安法对多巴胺进行定量检测,并且氧化过程展现出较为良好的性能. 其检出限为3.2 μmol·L -1（S/N = 3）,灵敏度为9.71 μA·(μmol·L -1·cm -2) -1,线性范围为10 ~ 80 μmol·L -1. 同时,所制备的传感器表现出良好的稳定性与抗干扰能力. 该传感器修饰过程简单、成本低、电化学性能良好,为多酸在化学传感领域的应用提供新思路.
邢逸飞 , 李娜 , 温晓芳 , 韩宏彦 , 崔敏 , 张聪 , 任聚杰 , 籍雪平 . 基于取代型多酸复合材料的多巴胺电化学检测[J]. 电化学, 2020 , 26(6) : 890 -899 . DOI: 10.13208/j.electrochem.190716
In this report, a dopamine electrochemical sensor based on metal-substituted polyoxometalates and reduced graphene oxide (RGO) composite was successfully constructed. The K2H2SiW11NiO39·xH2O (SiW11Ni) was synthesized by hydrothermal method, while the RGO was prepared by Hummers' method and chemical reduction method. The above-mentioned materials were characterized by SEM, FTIR and XRD. The as-synthesized SiW11Ni and RGO composites were modified on the surface of glassy carbon electrode (GCE) by drop coating method, and the sensing interface (SiW11Ni-RGO/GCE) was successfully constructed. The electrochemical properties of the sensing interface were studied by electrochemical impedance spectroscopy and cyclic voltammetry. After optimizing the experimental conditions, dopamine could be quantitatively detected by cyclic voltammetry with good performance. The limit of detection was 3.2 μmol·L -1 (S/N = 3), the sensitivity was 9.71 μA·(μmol·L -1·cm -2) -1, and the linear range was 10 to 80 μmol·L -1.
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