| 초록 |
As global warming is progressing rapidly in recent years, research on sensing CO2 gas has been studied extensively. So we fabricated an inverse opal hydrogel sensor that can detect CO2 gas in the open system as well as the closed system. In our system, the dissolved CO2 was converted to carbonate anion which reacts with amine functional group within the hydrogel to induce hydrogel swelling. The sensor was fabricated by DEECA (Directed Enhanced water Evaporation for Colloidal Assembly) method. To prevent various errors due to humidity, we conducted CO2 sensing experiment in a pure water system. On the hydrogel sensors in water, a steady flow of CO2/N2 mixed gas was applied at various ratios. The peak diffraction wavelength were obtained according to the concentration of CO2 gas. The physical phenomena of sensors were rigorously investigated with repeated changes CO2 and N2 flows. Also, the recovery of the sensor after CO2 sensing was investigated by temperature and pH controls. |
