title: Nitric oxide sensor based on carbon fiber covered with nickel porphyrin layer deposited using optimized electropolymerization procedure.
abstract: 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 coated porphyrinic sensors. Nafion coating can further enhance selectivity properties as well as aids to the stability of the sensors' responses.
authors.affiliation: Department of Physical Chemistry, Palacký University, Faculty of Science, tr. Svobody 26, 771 46 Olomouc, Czech Republic. hrbac@aix.upol.cz
authors.forename: Jan
authors.initials: J
authors.lastname: Hrbác
authors.forename: Cenek
authors.initials: C
authors.lastname: Gregor
authors.forename: Markéta
authors.initials: M
authors.lastname: Machová
authors.forename: Jana
authors.initials: J
authors.lastname: Králová
authors.forename: Tomás
authors.initials: T
authors.lastname: Bystron
authors.forename: Milan
authors.initials: M
authors.lastname: Cíz
authors.forename: Antonín
authors.initials: A
authors.lastname: Lojek
mesh_terms: D001205:Ascorbic Acid / Q000032:analysis; D015374:Biosensing Techniques / Q000295:instrumentation / Q000379:methods*; D002244:Carbon / Q000737:chemistry*; D000077482:Carbon Fiber; D002384:Catalysis; D004298:Dopamine / Q000032:analysis; D004563:Electrochemistry; D004566:Electrodes; D005465:Fluorocarbon Polymers / Q000737:chemistry*; D008665:Metalloporphyrins / Q000737:chemistry*; D009532:Nickel / Q000737:chemistry*; D009569:Nitric Oxide / Q000032:analysis*; D009573:Nitrites / Q000032:analysis; D010084:Oxidation-Reduction; D012680:Sensitivity and Specificity; D012834:Silver / Q000737:chemistry; D018030:Silver Compounds / Q000737:chemistry; D013997:Time Factors
chemical_list: D000077482:Carbon Fiber; D005465:Fluorocarbon Polymers; D008665:Metalloporphyrins; D009573:Nitrites; D018030:Silver Compounds; D009569:Nitric Oxide; C040402:perfluorosulfonic acid; D012834:Silver; D002244:Carbon; D009532:Nickel; C037548:silver chloride; D001205:Ascorbic Acid; D004298:Dopamine