Electrochemical Behavior of Levodopa at Multi-Wall Carbon Nanotubes-Quantum Dots Modified Glassy Carbon Electrodes

Yi TU, Qiao XU, Qiu-Ju ZOU, Zhao-Hui YIN, Yuan-Yuan SUN, Yuan-Di ZHAO
2007 Analytical Sciences  
A multi-wall carbon nanotubes (MWNTs)-quantum dots (QDs) composite-modified glassy carbon electrode (GCE) was prepared. The complex was characterized by transmission electron microscopy (TEM). The electrochemical behavior of levodopa at MWNTs and QDs-modified GCEs (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
more » ... a with a standard heterogeneous rate constant of 0.595 cm s -1 , which was greatly increased compared with the values for bare GCE and individual MWNTs modified GCE. The better electrocatalytic activity for levodopa at MWNTs-QDs/GCE may due to a synergistic effect between MWNTs and QDs. This result provides a novel way to promote research on biomicromolecules at nano-dimensions.
doi:10.2116/analsci.23.1321 pmid:17998753 fatcat:gkilrjkqtvestfvcbww2dnkkke