Key points are not available for this paper at this time.
The speciation of water and hydroxyl groups bound to the surface of a nanocrystalline titania film has been investigated by in-situ infrared spectroscopy as a function of temperature. Calibration of the absorbance of the δ(H 2 O) mode at 1625 cm - 1 by thermogravimetry has enabled an estimation of the concentration of surface H 2 O present during thermal dehydration of the films, which varied from 5 to 0.65 molecules per nm 2 over the temperature range 27−150 °C. Two types of coordinated H 2 O and both terminally bound and bridging hydroxyls have been identified by the temperature-dependent behavior of their corresponding O−H stretching modes. Hydrogen bonding was observed between coordinated H 2 O and terminally bound hydroxyls (ν(OH) = 3730 cm - 1 ), whereas bridging hydroxyls (ν(OH) = 3670 cm - 1 ) do not appear to be affected by similar H-bonding.
Finnie et al. (2001) studied this question.