Isotope exchange of 18O with 16O in sol-gel derived titania films containing 18O

Abstract

Isotopic exchange of ¹⁸O with¹⁶O in sol-gel derived titania films containing ¹⁸O was investigated by temperature programmed desorption (TPD) and secondary ion mass spectrometry (SIMS). The TPD experiment showed that oxygen evolved only in the form of the adsorbed water : the TPD curves of M/z=18 and M/z=20. The ratio of ¹⁸O to (¹⁸O +¹⁶O) was 13at.%. SIMS profiles of ¹⁸O and ¹⁶O in a titania film fired to 350°C in a TPD apparatus were measured. The ratio of ¹⁸O to (¹⁸O +¹⁶O) in the film was 14at.%.