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Quantum Chemical Study of Water Adsorption on the Surfaces of SrTiO 3 Nanotubes
Author(s) -
Bandura Andrei V.,
Kuruch Dmitry D.,
Evarestov Robert A.
Publication year - 2015
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201500267
Subject(s) - adsorption , quantum chemical , carbon nanotube , nanotechnology , materials science , chemistry , chemical engineering , chemical physics , molecule , organic chemistry , engineering
We have studied the adsorption of water molecules on the inner and outer surfaces of nanotubes generated by rolling (001) layers of SrTiO 3 cubic crystals. The stability and the atomic and electronic structures of the adsorbed layers are determined by using hybrid density functional theory. The absorption energy and the preferred adsorbate structure are essentially governed by the nature of the surface of the nanotube. Dissociative adsorption prevails on the outer nanotube surfaces. The stability of the adsorbed layers on the inner surfaces is related to the possibility of the formation of hydrogen bonds between water molecules and surface oxygen atoms, and depends on the surface curvature. The presence of water molecules on the inner surface of the nanotubes leads to an increase of the electronic band gap. Externally TiO 2 ‐terminated nanotubes could be used for the photocatalytic decomposition of water by ultraviolet radiation.