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Ultrathin carbon nanoparticle composite film electrodes: distinguishing dopamine and ascorbate
, Article Electroanalysis ; Volume 19, Issue 10 , 2007 , Pages 1032-1038 ; 10400397 (ISSN) ; Shahrokhian, S ; Marken, F ; Sharif University of Technology
2007
Abstract
Ultrathin carbon nanoparticle-poly(diallyldimethylammonium chloride) films (CNP-PDDAC films) are formed on tin-doped indium oxide (ITO) electrodes in a layer-by-layer electrostatic deposition process employing 9-18 nm diameter carbon particles. Transparent and strongly adhering films of high electrical conductivity are formed and characterized in terms of their electrochemical reactivity. When immersed in aqueous 0.1 M phosphate buffer pH 7, each layer of CNP-PDDAC (of ca. 5-6 nm average thickness) is adding an interfacial capacitance of ca. 10 μF cm-2. Absorption into the CNP-PDDAC nanocomposite film is dominated by the sites in the PDDAC cationomer and therefore anionic molecules such as...