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poly-diallyldimethylammonium-chloride
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Electrostatic accumulation and determination of triclosan in ultrathin carbon nanoparticle composite film electrodes
, Article Analytica Chimica Acta ; Volume 593, Issue 1 , 2007 , Pages 117-122 ; 00032670 (ISSN) ; Shahrokhian, S ; Psillakis, E ; Marken, F ; Sharif University of Technology
2007
Abstract
A film composed of carbon nanoparticles and poly(diallyldimethylammonium chloride) or CNP-PDDAC is formed in a layer-by-layer deposition process at tin-doped indium oxide (ITO) substrates. Excess positive binding sites within this film in aqueous phosphate buffer at pH 9.5 are quantified by adsorption of iron(III)phthalocyanine tetrasulfonate and indigo carmine. Both anionic redox systems bind with Langmuirian characteristics (K ≈ 105 mol-1 dm3) and show electrochemical reactivity throughout the film at different thicknesses. Therefore, the electrical conductivity in CNP-PDDAC films is good and the positive binding sites are approximately 140 pmol cm-2 per layer. Structural instability of...