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Highly efficient low-temperature plasma-assisted modification of TiO2 nanosheets with exposed {001} facets for enhanced visible-light photocatalytic activity.

Authors
Type
Published Article
Journal
Chemistry - A European Journal
0947-6539
Publisher
Wiley Blackwell (John Wiley & Sons)
Publication Date
Volume
20
Issue
45
Pages
14763–14770
Identifiers
DOI: 10.1002/chem.201402664
PMID: 25234004
Source
Medline
Keywords
  • Uv/Vis Spectroscopy
  • Doping
  • Nanosheets
  • Photochemistry
  • Plasma Chemistry
  • Titanium

Abstract

Anatase TiO2 nanosheets with exposed {001} facets have been controllably modified under non-thermal dielectric barrier discharge (DBD) plasma with various working gas, including Ar, H2 , and NH3 . The obtained TiO2 nanosheets possess a unique crystalline core/amorphous shell structure (TiO2 @TiO2-x ), which exhibit the improved visible and near-infrared light absorption. The types of dopants (oxygen vacancy/surface Ti(3+) /substituted N) in oxygen-deficient TiO2 can be tuned by controlling the working gases during plasma discharge. Both surface Ti(3+) and substituted N were doped into the lattice of TiO2 through NH3 plasma discharge, whereas the oxygen vacancy or Ti(3+) (along with the oxygen vacancy) was obtained after Ar or H2 plasma treatment. The TiO2 @TiO2-x from NH3 plasma with a green color shows the highest photocatalytic activity under visible-light irradiation compared with the products from Ar plasma or H2 plasma due to the synergistic effect of reduction and simultaneous nitridation in the NH3 plasma.

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