Study of an Au colloid self-assembled electrode and its application to the determination of carbon monoxide.
A novel electrochemical sensor has been developed for the detection of carbon monoxide. The chemically modified electrode, prepared by reaction of cysteine and then an Au colloid of size approximately 15 nm with a platinum microelectrode, has excellent catalytic activity toward carbon monoxide, with an oxidation potential of +600 mV relative to the Ag/AgCl electrode. The CO gas sensor is based on an Au colloid self-assembled modified electrode as working electrode, an Ag/AgCl electrode as reference electrode, a Pt electrode as counter electrode, and a porous film which is in direct contact with the gas-containing atmosphere. The effects on the determination of CO of different internal electrolyte solutions of perchloric acid, hydrochloric acid, sulfuric acid, nitric acid, and phosphate buffer of different concentrations were also studied. The sensor is characterized by a short response time and highly reproducible detection of CO. This sensor can be used in the field of environmental monitoring and control.
Shi
G
G
Department of Chemistry, East China Normal University, Shanghai, PR China.
Luo
M
M
Xue
J
J
Xu
F
F
Jin
L
L
Jin
J
J
D002138:Calibration; D002248:Carbon Monoxide / Q000032:analysis*; D002384:Catalysis; D004563:Electrochemistry / Q000379:methods*; D004566:Electrodes; D004573:Electrolytes / Q000737:chemistry; D017979:Gold Colloid / Q000737:chemistry*; D018625:Microscopy, Atomic Force / Q000379:methods; D010084:Oxidation-Reduction
D004573:Electrolytes; D017979:Gold Colloid; D002248:Carbon Monoxide