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Fabrication of a Polyaniline Ultramicroelectrode via a Self Assembled Monolayer Modified Gold Electrode
Department of Chemistry, Faculty of Science, Hacettepe University, Beytepe-Ankara 06800, Turkey
Department of Chemistry, Ordu University, Ordu 52200, Turkey
* Author to whom correspondence should be addressed.
Received: 16 April 2013; in revised form: 14 June 2013 / Accepted: 18 June 2013 / Published: 24 June 2013
Abstract: Herein, we report a simple and inexpensive way for the fabrication of an ultramicroelectrode and present its characterization by electrochemical techniques. The fabrication of polyaniline UME involves only two steps: modification of a gold (Au) electrode by self assembled monolayers (SAM) and then electrodeposition of polyaniline film on this thiol-coated Au electrode by using cyclic voltammetry and constant potential electrolysis methods. Two types of self-assembled monolayers (4-mercapto-1-butanol, MB, and 11-mercaptoundecanoic acid, MUA) were used, respectively, to see the effect of chain length on microelectrode formation. Microelectrode fabrication and utility of the surface was investigated by cyclic voltammetric measurements in a redox probe. The thus prepared polyaniline microelectrode was then used for DNA immobilization. Discrimination between double-stranded DNA (dsDNA) and single-stranded DNA (ssDNA) was obtained with enhanced electrochemical signals compared to a polyaniline-coated Au electrode. Different modifications on the electrode surfaces were examined using scanning electron microscopy (SEM).
Keywords: polyaniline; self-assembled monolayer (SAM); microelectrode; gold electrode; DNA
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Bolat, G.; Kuralay, F.; Eroglu, G.; Abaci, S. Fabrication of a Polyaniline Ultramicroelectrode via a Self Assembled Monolayer Modified Gold Electrode. Sensors 2013, 13, 8079-8094.
Bolat G, Kuralay F, Eroglu G, Abaci S. Fabrication of a Polyaniline Ultramicroelectrode via a Self Assembled Monolayer Modified Gold Electrode. Sensors. 2013; 13(7):8079-8094.
Bolat, Gulcin; Kuralay, Filiz; Eroglu, Gunes; Abaci, Serdar. 2013. "Fabrication of a Polyaniline Ultramicroelectrode via a Self Assembled Monolayer Modified Gold Electrode." Sensors 13, no. 7: 8079-8094.