Chronic Obstructive Pulmonary Disease (COPD) is one of top five chronic diseases in the world, and patients with this disease have lower oxygen utilization rates than normal people, which implies that the concentration of carbon dioxide in their exhalation will be different. The difficulty of detection lies on the professional operation, and the patients suffer great pain during the arterial blood sampling process. Moreover, it also needs technicians to perform better analytical data. All these facts reduce patient's willingness to inspect their physical health. Therefore, the development of a simple and lightweight commercial CO2 sensor that can be used at home is one of the goals in the medical community.