摘要
利用多壁碳纳米管(MWNTs)和量子点(QDs)作为修饰材料,采用简便的干燥吸附法制备玻碳修饰电极(GCE),构造了纳米材料修饰界面,采用循环伏安法和计时库伦法对左旋多巴的电化学行为进行了探讨.发现该电化学行为是一个两电子两质子的过程.该修饰电极能很好地催化左旋多巴的电化学行为,能够有效地促进它与电极之间的电子传递,有良好的电化学响应.其在修饰电极上的异相电子传递速率常数为0.595 cm·s^(-1),比在裸GCE和MWNTs修饰GCE上有很大提高.这很可能是由于QDs和MWNTs之间存在着某种协同作用,提高了MWNTs对左旋多巴的电化学催化能力所致.这一研究结果为在纳米复合修饰电极上研究生物小分子的电化学催化提供了一种新途径.
The multi-wall carbon nanotubes (MWNTs)-quantum dots (QDs) composite modified glassy carbon electrode (GCE) was prepared. The electrochemistry behavior of levodopa at MWNTs and QDs modified GCE (MWNTs-QDs/GCE) was studied by Cyclic Voltammetry (CV) and Chronocoulometry (CC). It was found that its electrochemical behavior was a two-charge-two-proton process. The modified electrode had high electrocatalytic activity for levodopa with standard heterogeneous rate constant of 0. 595 cm . s^- 1, which was greatly increased compared with bare GCE and individual MWNTs modified GCE. The better electrocatalytic activity for levodopa at MWNTs-QDs/GCE may due to the synergistic effect between MWNTs and QDs. This result provides a novel way in the research of biomicromolecule at nano-size.
出处
《华中师范大学学报(自然科学版)》
CAS
CSCD
北大核心
2010年第1期86-91,共6页
Journal of Central China Normal University:Natural Sciences
基金
国家863计划(2003AA234010)
国家自然科学基金项目(30670553
30370387)
关键词
碳纳米管
量子点
左旋多巴
电子传递
修饰电极
carbon nanotubes
quantum dots
levodopa
electron transfer
modified electrode