Front Cover: A Tunable Colorimetric Carbon Dioxide Sensor Based on Ion‐Exchanger‐ and Chromoionophore‐Doped Hydrogel (Anal. Sens. 6/2023)

Abstract

The cover feature image shows a two-dimensional (2D) colorimetric carbon dioxide (CO2) sensor composed of a gas-permeable polypropylene film (25 μm thick) and a signal transduction hydrogel layer (30 μm thick). The hydrogel layer contained a pH sensitive chromoionophore to indicate the CO2 induced pH change, and a cationic amine to further capture CO2 through the carbamate formation reaction. With this 2D colorimetric CO2 optode, the CO2 release from yeast-catalyzed flour fermentation was successfully monitored. More information can be found in the Research Article by Jingying Zhai, Xiaojiang Xie, and co-workers.