Journal
JOURNAL OF SUPERCRITICAL FLUIDS
Volume 88, Issue -, Pages 126-133Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.supflu.2014.02.003
Keywords
Titania quantum dots; Monolayer; Two-dimensional; Supercritical water; Hydrothermal
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Funding
- National Science Foundation of China [51176113]
- National Key Basic Research and Development Program [2009CB220000]
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Two-dimensional monolayer titania quantum dots (MTQDs) with similar to 0.4 nm thickness and similar to 2 nm lateral size are synthesized by supercritical water (SCW) treatment of titania nanotubes (TNTs). The morphology, chemical characteristics and the structure of MTQDs are studied. The formation mechanism of the MTQDs and the differences between SCW and low-temperature hydrothermal treatment are discussed. During the reaction, the high temperature, high pressure and high H*/OH- concentration of SCW dissolved TNTs into MTQDs, and the intercalation property of the active water clusters formed from the broken hydrogen bonding network facilitated the detachment of the MTQDs from the TNTs. The above two reasons lead to the capture of the dissolved tiny particles, which could hardly preserved in low-temperature hydrothermal treatment. The MTQDs may be the minimum constituent unit existing in the reality of the anatase TiO2. As a new member of the monolayer family, this new kind of 2D material may shed new light on the study of the monolayer materials. (C) 2014 Elsevier B.V. All rights reserved.
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