Sensitive and selective electrochemical detection of carbon monoxide in saline at a Pt-Ru/Nafion/MnO2-modified electrode.
We fabricated a sensitive and selective electrochemical carbon monoxide (CO) sensor for physiological conditions based on the Pt-Ru system. At a bare Pt-Ru electrode, a linear amperometric response to CO concentration was obtained in the range of 0.9-9 µM. However, significant current response to model electroactive interferents for physiological conditions, uric acid (UA), ascorbic acid (AA) and hydrogen peroxide (HP), was also recorded at the Pt-Ru electrode. The response to UA and AA was highly suppressed by coating the Pt-Ru electrode surface with a Nafion layer, and the response to HP was almost completely eliminated by the additional coating with a MnO(2)/chitosan layer. Finally, at the Pt-Ru/Nafion/MnO(2) electrode, amperometric CO detection with a sensitivity of 173 nA cm(-2) µM(-1) was obtained in the concentration range of 0.9-9 µM with the UA, AA and HP signal being below 1.7% at the same concentration of CO.
Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278–8510, Japan.
Hirosato
H
Seto
Takeshi
T
Kondo
Makoto
M
Yuasa
D002248:Carbon Monoxide / Q000032:analysis* / Q000737:chemistry; D004563:Electrochemistry / Q000295:instrumentation / Q000379:methods*; D004566:Electrodes; D005465:Fluorocarbon Polymers / Q000737:chemistry*; D017895:Manganese Compounds / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D010984:Platinum / Q000737:chemistry*; D012428:Ruthenium / Q000737:chemistry*; D012965:Sodium Chloride / Q000737:chemistry*
D005465:Fluorocarbon Polymers; D017895:Manganese Compounds; D010087:Oxides; C040402:perfluorosulfonic acid; D012965:Sodium Chloride; D010984:Platinum; D002248:Carbon Monoxide; D012428:Ruthenium; C016552:manganese dioxide