Activities per year
Abstract
The fate of photogenerated charges within ferroelectric metal oxides is key for photocatalytic applications. The authors study the contributions of i) tetragonal distortion, responsible for spontaneous polarization, and ii) point defects, on charge separation and recombination within BaTiO 3 (BTO) nanocrystals of cubic and tetragonal structure. Electron paramagnetic resonance (EPR) in combination with O 2 photoadsorption experiments show that BTO nanocrystals annealed at 600 °C have a charge separation yield enhanced by a factor > 10 compared to TiO 2 anatase nanocrystals of similar geometries. This demonstrates for the first time the beneficial effect of the BTO perovskite nanocrystal lattice on charge separation. Strikingly, charge separation is considerably hindered within BTO nanoparticles annealed ≥ 600 °C, due to the formation of Ba–O divacancies that act as charge recombination centers. The opposing interplay between tetragonal distortion and annealing-induced defect formation inside the lattice highlights the importance of defect engineering within perovskite nanoparticles.
Original language | English |
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Article number | 2206805 |
Pages (from-to) | e2206805 |
Number of pages | 7 |
Journal | Small |
Volume | 19 |
Issue number | 16 |
Early online date | 22 Jan 2023 |
DOIs | |
Publication status | Published - 22 Jan 2023 |
Bibliographical note
Publisher Copyright:© 2023 The Authors. Small published by Wiley-VCH GmbH.
Keywords
- barium titanate nanoparticles
- charge carrier recombination
- defect engineering
- ferroelectricity
- spontaneous polarization
Fields of Science and Technology Classification 2012
- 103 Physics, Astronomy
- 104 Chemistry
Activities
- 3 Poster presentation
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Influence of Powder Annealing on Spontaneous Polarization and Recombination Centers in BaTiO3 Nanocrystals
Diwald, O. (Speaker), Neige, E. (Speaker), Schwab, T. (Speaker), Musso, M. E. (Speaker), Bourret, G. (Speaker) & Berger, T. (Speaker)
6 Jun 2023Activity: Talk or presentation › Poster presentation › science to science / art to art
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Influence of Powder Annealing on Spontaneous Polarization and Recombination Centers in BaTiO3 Nanocrystals
Diwald, O. (Speaker), Neige, E. (Speaker), Schwab, T. (Speaker), Musso, M. E. (Speaker), Berger, T. (Speaker) & Bourret, G. (Speaker)
6 Jun 2023Activity: Talk or presentation › Poster presentation › science to science / art to art
-
Influence of Powder Annealing on Spontaneous Polarization and Recombination Centers in BaTiO3 Nanocrystals
Diwald, O. (Speaker), Neige, E. (Speaker), Schwab, T. (Speaker), Bourret, G. (Speaker), Musso, M. E. (Speaker) & Berger, T. (Speaker)
6 Jun 2023Activity: Talk or presentation › Poster presentation › science to science / art to art