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结合了碳纳米管和微电极两者的优越性,通过静电自组装方法有序地将混酸切割多壁碳纳米管修饰到碳纤维微电极上,并表征了自组装膜PDDA/MWNT修饰到碳纤维微电极上的均匀程度和稳定性,进一步采用循环伏安法研究了多巴胺和抗坏血酸在该修饰电极上的电化学行为。结果表明,该修饰微电极成功实现在抗坏血酸共存下选择性测定多巴胺,峰电流与多巴胺浓度在4μM/L到52μM/L之间呈现良好的线性关系,最低检测限是0.1μmol/L,该工作为多巴胺的活体、实时的电化学选择性测定奠定了基础。
Combining the advantages of both carbon nanotubes and microelectrodes, the hybrid acid-cleaved multi-walled carbon nanotubes were sequentially and orderly modified to carbon fiber microelectrodes by electrostatic self-assembly method, and the self-assembled films PDDA / MWNT modified to carbon fiber micro- The uniformity and stability of the electrode were investigated. The electrochemical behavior of dopamine and ascorbic acid on the modified electrode was further studied by cyclic voltammetry. The results showed that the modified microelectrode successfully achieved the selective determination of dopamine in the presence of ascorbic acid, the peak current and dopamine concentration in the 4μM / L to 52μM / L showed a good linear relationship between the minimum detection limit of 0.1μmol / L, the work For dopamine in vivo, real-time electrochemical selective determination laid the foundation.