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High pressure synthesis of amorphous TiO2 nanotubes

Journal Article · · AIP Advances
DOI:https://doi.org/10.1063/1.4930916· OSTI ID:1354385
 [1];  [1];  [1];  [1];  [1];  [1];  [2];  [1]
  1. Jilin Univ., Changchun (China)
  2. 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.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Basic Research Program of China; Cheung Kong Scholars Programme of China
OSTI ID:
1354385
Alternate ID(s):
OSTI ID: 22492348
Report Number(s):
BNL--112901-2016-JA
Journal Information:
AIP Advances, Journal Name: AIP Advances Journal Issue: 9 Vol. 5; ISSN 2158-3226
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (2)

Photoinduced reversible lattice expansion in W-doped TiO 2 through the change of its electronic structure journal February 2018
Comparative study on the pressure-induced phase transformation of anatase TiO 2 hollow and solid microspheres journal July 2019

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