An alkali-free approach for recyclable detection and accurate quantification of carbon dioxide gas

摘要

CO_2 gas monitoring is of great realistic significance, as CO_2 is a component of gas mixtures from many natural and man-made processes with huge impacts on globe climate and environment change. In this work, a squaraine-based colorimetric method without any alkali media fot recyclable CO_2 gas detec tion has been developed in pure alcohols. Furthermore, this CO_2-assay scheme permits quantitation of its amount over the whole concentration range (0-100%) and holds a limit of detection of approxi mate 26 ppm in MeOH. Combining theoretical analyses, a plausible sensing mechanism was particularly depicted.