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Sensors 2013, 13(7), 8079-8094; doi:10.3390/s130708079
Article

Fabrication of a Polyaniline Ultramicroelectrode via a Self Assembled Monolayer Modified Gold Electrode

1
,
2
,
1
 and
1,*
1 Department of Chemistry, Faculty of Science, Hacettepe University, Beytepe-Ankara 06800, Turkey 2 Department of Chemistry, Ordu University, Ordu 52200, Turkey
* Author to whom correspondence should be addressed.
Received: 16 April 2013 / Revised: 14 June 2013 / Accepted: 18 June 2013 / Published: 24 June 2013
(This article belongs to the Special Issue Ultramicroelectrode Electrochemistry - Theory and Applications)
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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 polyaniline; self-assembled monolayer (SAM); microelectrode; gold electrode; DNA
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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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.

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