Ensemble of carbon fiber ultra-microelectrodes modified with nanotubes, and its application to the determination of dopamine

. An ensemble of carbon fibers ultra-microelectrode modified with carbon nanotubes (EUME-CNTS) has been constructed based on a thin carbon nanotubes film which was coated onto surfaces of carbon fibers of ultra-microelectrode. SEM micrographs illustrated the image of carbon nanotubes on the carbon fiber surface. The electrochemical characteristics of the EUME-CNTS has been investigated by cyclic voltammetry. The electrochemical properties of dopamine on this electrode were also studied, and the detection limit was found to be 2.0 × 10 −9 mol·L −1 . Linear calibration plots were obtained for the oxidation peak current in a range 1.0 × 10 −7 –8.0 × 10 −5 mol·L −1 .