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(a) Spectra of the Na:In2O3 film at 200 °C acquired during the inlet of 1000 ppm of CO2 in dry conditions (1 RH%) and in wet conditions. (b) Magnification of the spectrum reported in panel (a) in the range from 2000 to 850 cm–1. The spectral noise is related to the increase of water species adsorbed at the surface.
