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Preparation and Characterization of GCE Coatings Combining DDDMAB and PDADMAC with FAD and HCM for Electrocatalytic Detection of Oxygen and Sulfur Oxoanions
Author(s) -
Chen ShenMing,
Chzo WenYan,
Thangamuthu R.
Publication year - 2009
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.200904691
Subject(s) - quartz crystal microbalance , electrochemistry , amperometry , chemistry , nafion , inorganic chemistry , electrode , redox , glassy carbon , cyclic voltammetry , chemically modified electrode , detection limit , electron transfer , flavin adenine dinucleotide , electrocatalyst , cationic polymerization , working electrode , photochemistry , polymer chemistry , cofactor , organic chemistry , chromatography , adsorption , enzyme
Electrochemically active hybrid coatings based on cationic films, didodecyldimethylammonium bromide (DDDMAB), and poly(diallyldimethylammonium chloride) (PDADMAC) are prepared on glassy carbon electrode surface by cycling the film‐covered electrode repetitively in a pH 7 solution containing flavin adenine dinucleotide (FAD), and anionic hexacyanometalate (HCM) complexes, Fe(CN) 6 3− and Ru(CN) 6 4− . Cyclic voltammetric features of hybrid coatings resemble that of electron transfer process of surface‐confined redox species. Electrochemical quartz crystal microbalance (EQCM) was used to monitor the deposition of FAD on DDDMAB film. Cyclic voltammetric peak potentials of modified electrode were found to be shifted to more negative region with increasing pH of contacting solution with a slope value of 63.3mV per pH unit. The electrocatalytic behavior of FAD‐modified DDDMAB‐coated GCE and hybrid film electrodes was tested towards reduction of oxygen, S 2 O 8 2− , SO 5 2− and oxidation of SO 3 2− . The application of FAD‐modified DDDMAB‐coated GCE for S 2 O 8 2− estimation was demonstrated in amperometric mode. The sensitivity and detection limit ( S / N =3) were 267.6 μA mM −1 and 2×10 −6 M, respectively.