Please use this identifier to cite or link to this item: https://doi.org/10.1021/jacs.7b08229
Title: Fabrication and Properties of a Free-Standing Two-Dimensional Titania
Authors: Wang, Song Ling
Luo, Xin 
Zhou, Xiong 
Zhu, Ye
Chi, Xiao
Chen, Wei 
Wu, Kai
Liu, Zheng
Quek, Su Ying 
Xu, Guo Qin 
Keywords: Science & Technology
Physical Sciences
Chemistry, Multidisciplinary
Chemistry
ELECTRONIC-STRUCTURE
TIO2
SEMICONDUCTORS
BANDGAP
OXIDE
MOS2
CONFINEMENT
INSULATORS
MONOLAYERS
NANOSHEETS
Issue Date: 1-Nov-2017
Publisher: AMER CHEMICAL SOC
Citation: Wang, Song Ling, Luo, Xin, Zhou, Xiong, Zhu, Ye, Chi, Xiao, Chen, Wei, Wu, Kai, Liu, Zheng, Quek, Su Ying, Xu, Guo Qin (2017-11-01). Fabrication and Properties of a Free-Standing Two-Dimensional Titania. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 139 (43) : 15414-15419. ScholarBank@NUS Repository. https://doi.org/10.1021/jacs.7b08229
Abstract: © 2017 American Chemical Society. 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.
Source Title: JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
URI: https://scholarbank.nus.edu.sg/handle/10635/170892
ISSN: 00027863
15205126
DOI: 10.1021/jacs.7b08229
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