Development of Surface-Modified Microelectrode Arrays for the Electrochemical Detection of Dihydrogen Phosphate

Autor:	Yvonne E. Watson, Guy Royal, Damien W. M. Arrigan, Olivier Reynes, Grégoire Herzog, Eric Saint-Aman, Jean-Claude Moutet, Alfonso Berduque
Rok vydání:	2005
Předmět:	Inorganic chemistry Analytical chemistry food and beverages chemistry.chemical_element Multielectrode array Analytical Chemistry chemistry.chemical_compound Microelectrode chemistry Ferrocene Chemisorption Electrode Electrochemistry Differential pulse voltammetry Cyclic voltammetry Platinum
Zdroj:	Electroanalysis. 17:392-399
ISSN:	1521-4109 1040-0397
Popis:	Platinum and gold microelectrode arrays (MEAs), fabricated on silicon substrates with different geometric characteristics, were surface-modified by the potentiostatic electropolymerization of the pyrrole-ferrocene derivative Py(CH2)3NHCOFc, in the case of the platinum MEAs, and chemisorption of the thiol-functionalized ferrocene HS(CH2)6N+(CH3)2Fc, in the case of the gold MEAs. Cyclic voltammetry of these MEAs was typical of thin film behavior. The modified MEAs were investigated for the detection of the dihydrogen phosphate mono-anion in non-aqueous media via differential pulse voltammetry. This was based on electrostatic interaction and/or hydrogen-bonding between the target anion and the amide-ferrocene or ammonium-ferrocene functionalized electrode surfaces. A decrease in the ferrocene (Fc) oxidation peak current with a concomitant increase in the peak current of a new peak at lower potentials was observed when the concentration of the dihydrogen phosphate was increased.
Databáze:	OpenAIRE
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