Electrochemical sensing of CO by gold particles electrodeposited on indium tin oxide substrate

The gold submicroparticles (AuSMPs) electrodeposited on indium tin oxide (ITO) were used to develop an electrochemical method for determining the concentration of CO in gas phase. We demonstrated that the peak current for CO oxidation in cyclic voltammetry (CV) is proportionally dependent on the gas phase concentration of CO. Experimental results are in good agreements with the theoretical predictions over a wide concentration regime, providing a solid foundation for the quantitatively sensing of CO at AuSMPs/ITO electrodes.