The changes in resistance caused by the influence of CO gas and experimental conditions were measured using a home-made dynamic gas sensing setup. The gas chamber was crafted using a glass of 8-cc volume with inlet and outlet gas ports. Additionally, the calibrated concentration of testing gas kept in Tedlar bags was utilized to inject CO gas, maintaining a flow rate of 200 sccm. A program-controlled script was run using Alicat Mass Flow Controllers (MFCs) to achieve the target concentrations, while dry air was used as reference gas for sensing measurement. The sensors were sustained under the steady flow of dry air for 5 min before the target gas with various concentrations was exposed to the sensor chip for the script duration. Chemisensing measurements were characterized using a Keithley 4200A semiconductor parameter analyzer.
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