Probing Water and CO₂ Interactions at the Surface of Collapsed Titania Nanotubes Using IR Spectroscopy

Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry
Kaustava BhattacharyyaKimberly A Gray

Abstract

Collapsed titania nanotubes (cTiNT) were synthesized by the calcination of titania nanotubes (TiNT) at 650 °C, which leads to a collapse of their tubular morphology, a substantial reduction in surface area, and a partial transformation of anatase to the rutile phase. There are no significant changes in the position of the XPS responses for Ti and O on oxidation or reduction of the cTiNTs, but the responses are more symmetric than those observed for TiNTs, indicating fewer surface defects and no change in the oxidation state of titanium on oxidative and/or reductive pretreatment. The interaction of H₂O and CO₂ with the cTiNT surface was studied. The region corresponding to OH stretching absorptions extends below 3000 cm(-1), and thus is broader than is typically observed for absorptions of the OH stretches of water. The exchange of protons for deuterons on exposure to D₂O leads to a depletion of this extended absorption and the appearance of new absorptions, which are compatible with deuterium exchange. We discuss the source of this extended low frequency OH stretching region and conclude that it is likely due to the hydrogen-bonded OH stretches. Interaction of the reduced cTiNTs with CO₂ leads to a similar but smaller set of ad...Continue Reading

References

Aug 1, 2002·Acta Crystallographica. Section B, Structural Science·Q ChenL -M Peng
Feb 14, 2006·The Journal of Physical Chemistry. B·Jing ZhangCan Li
Feb 21, 2006·Journal of Biomedical Materials Research. Part a·Hiroaki TsuchiyaPatrik Schmuki
Jul 10, 2007·Journal of the American Chemical Society·Jing LiHua Chun Zeng
Feb 26, 2011·Journal of the American Chemical Society·Nada M DimitrijevicPeter Zapol

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Citations

Jan 23, 2016·Nanoscale·Nicolò BontempiIvano Alessandri
Apr 19, 2019·Inorganic Chemistry·Damian WlodarczykAndrzej Suchocki

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Methods Mentioned

BETA
thermal treatment
electron microscopy
transmission electron microscopy
X-ray

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