Maryvergheese, T. and Sheela, B. (2004) Evaluation of monolayers and mixed monolayers formed from mercaptobenzothiazole and decanethiol as sensing platforms. Materials Chemistry and Physics, 83 (2). pp. 229-238. ISSN 0254-0584

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Abstract

In this investigation, the characterisation of monolayer and mixed monolayers formed from mercaptobenzothiazole (MBT) and decanethiol (DT) has been carried out with cyclic voltammetry. The SAMs have been tested for their stability and electron transfer blocking properties. The redox probes used in the present study are [Fe(CN)6]4−, [Ru(NH3)6]2+ and Cu underpotential deposition (upd). The electron transfer kinetics is investigated in acid and neutral pH range. Electron transfer kinetics is altered by the nature of charge on the redox probe and the charge on the monolayer. Electron transfer kinetics of negatively charged redox probes like ferrocyanide ions is blocked when the surface pKa < pHmedium and at pKa > pHmedium reversible features is observed for negatively charged probes. An exactly reverse effect is observed in the case of positively charged redox species like [Ru(NH3)6]2+/3+. Cu under potential deposition studies reflects the structural integrity and compactness of the SAM layer. The utility of these monolayers and mixedmonolayer for selective sensing of dopamine is discussed based on their ability to discriminate between positively and negatively charged redox species at different pH.

Item Type:	Article
Uncontrolled Keywords:	Mercaptobenzothiazole; Self-assembled monolayers; Mixed monolayers; Electron transfer kinetics; Molecular recognition
Subjects:	Electrodics and Electrocatalysis
Divisions:	UNSPECIFIED
Depositing User:	ttbdu cecri
Date Deposited:	06 Apr 2012 05:25
Last Modified:	06 Apr 2012 05:25
URI:	http://cecri.csircentral.net/id/eprint/1003

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