Water Adsorption on Diamond (110) Studied by Multiple Internal ReflectionInfrared Spectroscopy

摘要

The adsorption of water on a natural, type IIa diamond (110) surface is studiedby multiple internal reflection infrared spectroscopy (MIRIRS). Similar results are observed for the hydrogen-free, and hydrogen-terminated diamond (110) surfaces. Exposure of water at 100 K reveals the presence of physisorbed molecular water on the surface, with no evidence of dissociation. Upon heating to approximately 160 K, the water is desorbed from the surface without any evidence of chemisorption or decomposition. Exposure of the surface to water at elevated temperatures (373 and 773 K) also failed to produce any evidence in the infrared spectra of chemisorption or decomposition. However, the absence of water dissociative chemisorption may be the result of sp2 carbon contamination which was found on the surface at the conclusion of the experiments.... Diamond, Multiple internal reflection infrared spectroscopy, Water.