A comparative study of electrochemical sensors fabricated from composite pencil graphite (CPG) lead modified with carboxylic multi walled carbon nanotube (c-MWCNT) via direct dripping method (DM) and electrophoretic deposition (EPD) was carried out. DM was performed by adding a 2 mu L c-MWCNT dispersion onto the surface of CPG electrode (CPGE), whilst EPD of c-MWCNT/CPGE was carried out at a constant applied potential of 25 V and deposition time of 1 min. The electrochemical performances of various modified CPGE have been characterized by cyclic voltammetry and electrochemical impedance spectroscopy (EIS) in Fe(CN)(6)(4-/3) redox system. The surface morphologies of the electrodes were studied by using field emission scanning electron microscopy (FESEM). Results showed that EPD deposited c-MWCNT is superior to DM due to its uniform c-MWCNT film and good electrochemical performances. The oxidation behavior of scopoletin on the c-MWCNT/CPGE made via EPD has also shown encouraging results. (C) 2012 The Electrochemical Society. [DOI: 10.1149/2.082302jes] All rights reserved.