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Fabrication and Properties of a Free-Standing Two-Dimensional Titania
journal contribution
posted on 2017-10-11, 00:00 authored by Song Ling Wang, Xin Luo, Xiong Zhou, Ye Zhu, Xiao Chi, Wei Chen, Kai Wu, Zheng Liu, Su Ying Quek, Guo Qin XuThe
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.
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2- D TiO 2 sheetband gapquasiparticle band structurestrains cause2- D materialsFree-Standing Two-Dimensional Titaniaband gap 2- D TiO 2dye pollutantslow-energy photonsvisible-light regionabsorption spectralepidocrocite TiO 2 structurefirst-principles calculationslattice strainsas-formed 2- D TiO 2 sheetssolvothermal methodologysinglet oxygennonuniform strains
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