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Effect of the Concentration of Supporting Electrolyte on Spectroelectrochemical Detection of [Ru(bpy) 3 ] 2+
Author(s) -
Morris Laura K.,
Abu Eme A.,
Bowman Christopher,
Estridge Carla E.,
Andria Sara E.,
Seliskar Carl J.,
Heineman William R.
Publication year - 2011
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201000529
Subject(s) - absorbance , cyclic voltammetry , electrolyte , indium tin oxide , materials science , electrode , polystyrene , nafion , supporting electrolyte , analytical chemistry (journal) , electrochemistry , indium , inorganic chemistry , thin film , chemistry , optoelectronics , nanotechnology , chromatography , polymer , composite material
Abstract The effect of different concentrations of supporting electrolytes, either KNO 3 , NaNO 3 or Ca(NO 3 ) 2 , on the response of a spectroelectrochemical sensor was examined using [Ru(bpy) 3 ] 2+ as the analyte. The sensor consisted of an indium tin oxide (ITO) optically transparent electrode (OTE) coated with a thin film of either Nafion or SSEBS (sulfonated polystyrene‐block‐poly(ethylene‐ran‐butylene)‐block polystyrene) and used attenuated total reflection absorbance for optical detection and cyclic voltammetry for electrochemical detection. The practical implication of these results is the need to take into account the effect of ionic strength of the sample when using a spectroelectrochemical sensor of this type for quantitative analysis.