Journal
ELECTROANALYSIS
Volume 21, Issue 21, Pages 2331-2338Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/elan.200904691
Keywords
DDDMAB, PDADMAC, Modified GCE, FAD, HCM; Oxygen, Sulfur Oxoanions
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Funding
- National Science Council of Taiwan (ROC)
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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, S2O82-, SO52- and oxidation of SO32-. The application of FAD-modified DDDMAB-coated GCE for S2O82- estimation was demonstrated in amperometric mode. The sensitivity and detection limit (S/N = 3) were 267.6 mu A mM(-1) and 2 x 10(-6) M, respectively.
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