Journal
BIOELECTROCHEMISTRY
Volume 71, Issue 1, Pages 46-53Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.bioelechem.2006.09.007
Keywords
nitric oxide sensor; nickel porphyrin; electropolymerization; carbon fiber; pretreatment
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Electropolymerization regime of meso-tetrakis(3-methoxy-4-hydroxyphenyl) porphyrin is optimized to yield films possessing both electrocatalytical and permselective properties towards nitric oxide oxidation. The sensor composed of electrochemically oxidized carbon fiber, covered solely with nickel porphyrin derivative layer electropolymerized using our method, is characterized by high selectivity towards nitrite (1:600), ascorbate (1:8000) and dopamine (> 1:80), determined by constant potential amperometry at 830 mV (vs. Ag/AgCl). Selectivity for ascorbate and dopamine as well as detection limit for NO (1.5 nM at S/N=3) is 5-10 times better than parameters usually reported for Nafion((R)) coated porphyrinic sensors. Nafion coating can further enhance selectivity properties as well as aids to the stability of the sensors' responses. (c) 2006 Elsevier B.V. All rights reserved.
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