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Multilayer assemblies of polyelectrolyte-gold nanoparticles for the electrocatalytic oxidation and detection of arsenic(III)

Thotiyl, Ottakam MM and Basit, Hajra and Sanchez, Julio A and Goyer, Cedric and Coche-Guerente, Liliane and Dumy, Pascal and Sampath, S and Labbe, Pierre and Moutet, Jean-Claude (2012) Multilayer assemblies of polyelectrolyte-gold nanoparticles for the electrocatalytic oxidation and detection of arsenic(III). In: JOURNAL OF COLLOID AND INTERFACE SCIENCE, 383 (1). pp. 130-139.

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Official URL: http://dx.doi.org/10.1016/j.jcis.2012.06.033


Multilayers of poly(diallyldimethylammonium chloride) (PDDA) and citrate capped Au nanoparticles (AuNPs) anchored on sodium 3-mercapto-1-propanesulfonate modified gold electrode by electrostatic layer-by-layer assembly (LbL) technique are shown to be an excellent architecture for the direct electrochemical oxidation of As(III) species. The growth of successive layers in the proposed LbL architecture is followed by atomic force microscopy, UV-vis spectroscopy, quartz crystal microbalance with energy dissipation, and electrochemistry. The first bilayer is found to show rather different physico-chemical characteristics as compared to the subsequent bilayers, and this is attributed to the difference in the adsorption environments. The analytical utility of the architecture with five bilayers is exploited for arsenic sensing via the direct electrocatalytic oxidation of As(III), and the detection limit is found to be well below the WHO guidelines of 10 ppb. When the non-redox active PDDA is replaced by the redoxactive Os(2,2'-bipyridine)(2)Cl-poly(4-vinylpyridine) polyelectrolyte (PVPOs) in the LbL assembly, the performance is found to be inferior, demonstrating that the redox activity of the polyelectrolyte is futile as far as the direct electro-oxidation of As(III) is concerned. (C) 2012 Elsevier Inc. All rights reserved.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to ACADEMIC PRESS INC ELSEVIER SCIENCE
Keywords: Layer-by-layer films; Polyelectrolytes; Gold nanoparticles; Osmium complex; Arsenic oxidation; Arsenic sensing
Department/Centre: Division of Chemical Sciences > Inorganic & Physical Chemistry
Depositing User: Id for Latest eprints
Date Deposited: 08 Jan 2013 12:29
Last Modified: 08 Jan 2013 12:29
URI: http://eprints.iisc.ac.in/id/eprint/45258

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