Nitric oxide sensor based on carbon fiber covered with nickel porphyrin layer deposited using optimized electropolymerization procedure.
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.
Hrbác
Jan
J
Department of Physical Chemistry, Palacký University, Faculty of Science, tr. Svobody 26, 771 46 Olomouc, Czech Republic. hrbac@aix.upol.cz
Gregor
Cenek
C
Machová
Markéta
M
Králová
Jana
J
Bystron
Tomás
T
Cíz
Milan
M
Lojek
Antonín
A
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
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