MWCNT Modified Composite Pencil Graphite Electrodes Fabricated by Direct Dripping and Electrophoretic Deposition Methods: A Comparison Study

• Published in: Journal of the Electrochemical Society Vol. 160; no. 2; pp. B23 - B29
• Main Authors: Zhu, Qing-Gong, Sujari, Amat Ngilmi Ahmad, Ab Ghani, Sulaiman
• Format: Journal Article
• Language: English
• Published: The Electrochemical Society 01.01.2013
• ISSN: 0013-4651; 1945-7111
• DOI: 10.1149/2.082302jes

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 μL 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)64-/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.