期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 1, 期 1, 页码 309-314出版社
AMER CHEMICAL SOC
DOI: 10.1021/jz9001828
关键词
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类别
资金
- NSFC [10674053, 10979001, 20773043, 10574053]
- National Basic Research Program of China [2005CB724400, 2001CB711201]
- Program for the Changjiang Scholar and Innovative Research Team in University [IRT0625]
- Cheung Kong Scholars Programme of China
- National Fund for Fostering Talents of Basic Science [J0730311]
- NSF [EAR01-35554]
- US-DOE [DE-AC02-10886]
The structural phase transitions of single-crystal TiO2-B nanoribbons were investigated in situ at high pressure using synchrotron X-ray diffraction and Raman scattering. Our results have shown a pressure induced amorphization (PIA) occurred in TiO2-B nanoribbons upon compression, resulting in a high-density amorphous (HDA) form related to the baddeleyite structure. Upon decompression, the HDA form transforms to a low-density amorphous (LDA) form, while the samples still maintain their pristine nanoribbon shape. A high-resolution transmission electron microscopy (HRTEM) image reveals that the LOA, phase has an alpha-PbO2 structure with short-range order. We propose a homogeneous nucleation mechanism to explain the pressure-induced amorphous phase transition in the TiO2-B nanoribbons. Our study demonstrates for the first time that PIA and polyamorphism occurred in the one-dimensional (1D) TiO2 nanomaterials and provides a new method for preparing 1 D amorphous nanomaterials from crystalline nanomaterials.
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