Published July 15, 2017 | Version v1
Journal article Metadata-only

The effect of bulk/surface defects ratio change on the photocatalysis of TiO2 nanosheet film

Creators

  • 1. CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026 (China)
  • 2. Department of Modern Physics, University of Science and Technology of China, Hefei 230026 (China)
  • 3. State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230026 (China)
  • 4. National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230026, Anhui (China)
  • 5. Synergetic Innovation Center of Quantum Information & Stop Quantum Physics, University of Science and Technology of China, Hefei 230026 (China)

Description

Highlights: • The defect behaviors of TiO2 nanosheet array films were studied by positron annihilation spectroscopy. • Different bulk/surface defect ratios were realized by annealing at different temperature. • It was concluded that bulk defects are mainly Ti3+ vacancy defects. • The separation efficiency of photogenerated electrons and holes could be significantly improved by optimizing the bulk/surface defects ratio. - Abstract: The photocatalysis behavior of TiO2 nanosheet array films was studied, in which the ratio of bulk/surface defects were adjusted by annealing at different temperature. Combining positron annihilation spectroscopy, EPR and XPS, we concluded that the bulk defects belonged to Ti3+ related vacancy defects. The results show that the separation efficiency of photogenerated electrons and holes could be significantly improved by optimizing the bulk/surface defects ratio of TiO2 nanosheet films, and in turn enhancing the photocatalysis behaviors.

Availability note (English)

Available from http://dx.doi.org/10.1016/j.apsusc.2017.03.142

Additional details

Identifiers

DOI
10.1016/j.apsusc.2017.03.142;
PII
S0169-4332(17)30820-6;

Publishing Information

Journal Title
Applied Surface Science
Journal Volume
410
Journal Page Range
p. 513-518
ISSN
0169-4332
CODEN
ASUSEE

INIS

Country of Publication
Netherlands
Country of Input or Organization
International Atomic Energy Agency (IAEA)
INIS RN
48078204
Subject category
S77: NANOSCIENCE AND NANOTECHNOLOGY;
Descriptors DEI
ANNEALING; ANNIHILATION; DEFECTS; ELECTRON SPIN RESONANCE; ELECTRONS; FILMS; NANOSTRUCTURES; OXYGEN; PHOTOCATALYSIS; POSITRON ANNIHILATION SPECTROSCOPY; SHEETS; SURFACES; TITANIUM OXIDES; TWO-DIMENSIONAL SYSTEMS; VACANCIES; X-RAY PHOTOELECTRON SPECTROSCOPY
Descriptors DEC
CATALYSIS; CHALCOGENIDES; CRYSTAL DEFECTS; CRYSTAL LATTICES; CRYSTAL STRUCTURE; ELECTRON SPECTROSCOPY; ELEMENTARY PARTICLES; ELEMENTS; FERMIONS; HEAT TREATMENTS; INTERACTIONS; LEPTONS; MAGNETIC RESONANCE; NONMETALS; OXIDES; OXYGEN COMPOUNDS; PARTICLE INTERACTIONS; PHOTOELECTRON SPECTROSCOPY; POINT DEFECTS; RESONANCE; SPECTROSCOPY; TITANIUM COMPOUNDS; TRANSITION ELEMENT COMPOUNDS

Optional Information

Copyright
Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.