High pressure synthesis of amorphous TiO2 nanotubes

Li, Quanjun; Liu, Ran; Wang, Tianyi; Xu, Ke; Dong, Qing; Liu, Bo; Liu, Jing; Liu, Bingbing

doi:10.1063/1.4930916

Title: High pressure synthesis of amorphous TiO₂ nanotubes

Journal Article · Wed Sep 09 00:00:00 EDT 2015 · AIP Advances

DOI:https://doi.org/10.1063/1.4930916· OSTI ID:1354385

Li, Quanjun ^[1]; Liu, Ran ^[1]; Wang, Tianyi ^[1]; Xu, Ke ^[1]; Dong, Qing ^[1]; Liu, Bo ^[1]; Liu, Jing ^[2]; Liu, Bingbing ^[1]

Jilin Univ., Changchun (China)
Chinese Academy of Sciences (CAS), Beijing (China)

Amorphous TiO₂ nanotubes with diameters of 8-10 nm and length of several nanometers were synthesized by high pressure treatment of anatase TiO₂ nanotubes. The structural phase transitions of anatase TiO₂ nanotubes were investigated by using in-situ high-pressure synchrotron X-ray diffraction (XRD) method. The starting anatase structure is stable up to ~20GPa, and transforms into a high-density amorphous (HDA) form at higher pressure. Pressure-modified high- to low-density transition was observed in the amorphous form upon decompression. The pressure-induced amorphization and polyamorphism are in good agreement with the previous results in ultrafine TiO₂ nanoparticles and nanoribbons. The relationship between the LDA form and α-PbO₂ phase was revealed by high-resolution transmission electron microscopy (HRTEM) study. In addition, the bulk modulus (B₀ = 158 GPa) of the anatase TiO₂ nanotubes is smaller than those of the corresponding bulks and nanoparticles (180-240 GPa). We suggest that the unique open-ended nanotube morphology and nanosize play important roles in the high pressure phase transition of TiO₂ nanotubes.

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Research Organization:: Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Basic Research Program of China; Cheung Kong Scholars Programme of China

Grant/Contract Number:: SC00112704; EAR 06-49658

OSTI ID:: 1354385

Report Number(s):: BNL-112901-2016-JA

Journal Information:: AIP Advances, Vol. 5, Issue 9; ISSN 2158-3226

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 12 works

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