Self-assembled monolayers (SAMs) of cobalt tetracarboxylic acidchloride phthalocyanine covalently attached onto a preformed mercaptoethanol SAM: A novel method

A feasible method of fabricating phthalocyanine sensor was developed by covalent attachment of cobalt tetracarboxylic acidchloride phthalocyanine (CoTCACIPc) onto a preformed 2-mercaptoethanol (2-ME) self-assembled monolayer (SAM) modified gold electrode (designated as CoTCACIPc-2-ME-SAM). The surfa...

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Bibliographic Details
Published in:Electrochimica acta 2006-04, Vol.51 (17), p.3489-3494
Main Authors: Mashazi, Philani N., Ozoemena, Kenneth I., Maree, David M., Nyokong, Tebello
Format: Article
Language:English
Subjects:
Analytical chemistry
Chemistry
Cobalt phthalocyanine
Exact sciences and technology
General, instrumentation
Gold
l-Cysteine
Mercaptoethanol
Self-assembled monolayer
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Summary:A feasible method of fabricating phthalocyanine sensor was developed by covalent attachment of cobalt tetracarboxylic acidchloride phthalocyanine (CoTCACIPc) onto a preformed 2-mercaptoethanol (2-ME) self-assembled monolayer (SAM) modified gold electrode (designated as CoTCACIPc-2-ME-SAM). The surface concentration of the CoTCACIPc was found to be 4.58 × 10 −10 mol/cm 2. The sensor gave a linear response to l-cysteine over the concentration range 0.28–20 μM with a detection limit of 5 × 10 −7 M and best response time of 2 s.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2005.10.004