Schematic illustration of the interactions between (A) dOH and ammonia (NH₃) and (B) dOH and carbon dioxide (CO₂). the next three sentences appear to be interpretation or a comment and should be removed from the caption. Please check and remove if you agree NH₃ is a polar molecule, it tightly binds to the dOH via H-bonding between the N atom and the dOH. CO₂ is an apolar species, with binding energy three times lower than that of NH₃. This implies that NH₃ is a more effective dangling-OH band blocker over CO₂. The reported binding energies are from Ferrero et al. (2020). The simplified geometries are an adaptation of real geometries obtained with quantum chemical calculations in Ferrero et al. (2020).