Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/74548
Title: Fabrication and properties of a free-standing two-dimensional Titania
Authors: Wang, SL
Luo, X 
Zhou, X
Zhu, Y 
Chi, X
Chen, W
Wu, K
Liu, Z
Quek, SY
Xu, GQ
Issue Date: 2017
Publisher: American Chemical Society
Source: Journal of the American Chemical Society, 2017, v. 139, no. 43, p. 15414-15419 How to cite?
Journal: Journal of the American Chemical Society 
Abstract: The synthesis of free-standing two-dimensional titania (2-D TiO2) with a reduced band gap presents complex challenges to synthetic chemists. Here, we report a free-standing 2-D TiO2 sheet synthesized via a one-step solvothermal methodology, with a measured optical onset at ∼1.84 eV. Using first-principles calculations in combination with experiment, we propose that the as-formed 2-D TiO2 sheets are layers of the lepidocrocite TiO2 structure, but with large nonuniform strains consistent with its crumpled morphology. These strains cause a significant change in the quasiparticle band structure and optical absorption spectra, resulting in large absorption in the visible-light region. This narrow band gap 2-D TiO2 can catalyze the formation of singlet oxygen and the degradation of dye pollutants with low-energy photons of solar light. Our work demonstrates that lattice strains intrinsic to 2-D materials, especially its crumpled, free-standing forms, can result in new and useful properties.
URI: http://hdl.handle.net/10397/74548
ISSN: 0002-7863
EISSN: 1520-5126
DOI: 10.1021/jacs.7b08229
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