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Nickel-Gold Bimetallic Monolayer Colloidal Crystal via Galvanic Replacement as a Highly Sensitive Electrochemical Sensor

Abstract

Bimetallic Ni-Au monolayer colloidal crystals (MCC) were fabricated by performing galvanic replacement of Ni monolayers with Au salt. The influence of Au concentration used in the galvanic replacement solutions on the morphology and structure, of the resulting Ni-Au surface is studied. It was found that the use of monolayer colloidal crystals; which display cohesive structure formations across the monolayer, results in the galvanic replacement reaction occurring more evenly over the surface when compared to a thin film counterpart. The fabricated devices were analyzed under alkaline conditions using chronoamperometric techniques to detect glucose concentrations ranging between 20 µM and 10 mM. The optimum Ni Au MCC substrate was produced using 0.1 mM Au salt solution and showed a very low experimental detection limit of 14.9µM and a calculated sensitivity of 506 µA•mM-1•cm-2 which was ~3 times larger than the plain Ni MCC substrate. The Ni Au MCC substrate also showed minimal current response changes in the presence of common physiological contaminants thus being a highly selective electrochemical glucose sensor.

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Publication details

The article was received on 24 Feb 2017, accepted on 07 Jun 2017 and first published on 08 Jun 2017


Article type: Paper
DOI: 10.1039/C7TB00537G
Citation: J. Mater. Chem. B, 2017, Accepted Manuscript
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    Nickel-Gold Bimetallic Monolayer Colloidal Crystal via Galvanic Replacement as a Highly Sensitive Electrochemical Sensor

    B. Lay, V. E. Coyle, A. E. Kandjani, M. H. Amin, Y. M. Sabri and S. K. Bhargava, J. Mater. Chem. B, 2017, Accepted Manuscript , DOI: 10.1039/C7TB00537G

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