Diazonium salts: Stable monolayers on gold electrodes for sensing applications |
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Authors: | Guozhen Liu, Till B cking,J. Justin Gooding |
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Affiliation: | aSchool of Chemistry, The University of New South Wales, Sydney, NSW 2052, Australia |
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Abstract: | The modification of gold electrodes with 4-carboxyphenyl diazonium salts to form stable layers for sensing applications is reported. Electrochemical reduction of 4-carboxyphenyl diazonium salts on gold electrodes yielded more stable layers than alkanethiol self-assembled monolayers in terms of extremes of electrode potential, sonication and with time. The application of the 4-carboxyphenyl modified electrodes for electrochemical sensing, which typically requires short chain alkanethiols on gold electrodes, is demonstrated via the covalent attachment of oligopeptides for the selective detection of Cu2+, Cd2+ and Pb2+. The diazonium salt/peptide modified gold electrodes not only had greater stability but also performed with lowest detected concentration to alkanethiol/peptide modified electrodes and with far greater sensitivity than the metal ion sensors when diazonium salt/peptide modified similar glassy carbon electrodes were employed. |
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Keywords: | Diazonium salts Self-assembled monolayers Sensing applications Gold electrodes Metal ion detection |
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