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Bourret, Gilles R.
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Publications (4/4 displayed)
- 2023Charge Separation in BaTiO3 Nanocrystals: Spontaneous Polarization versus Point Defect Chemistrycitations
- 2020Morphology-Graded Silicon Nanowire Arrays via Chemical Etchingcitations
- 2016Hydration of magnesia cubes: a helium ion microscopy study
- 2016Modification of Charge Trapping at Particle/Particle Interfaces by Electrochemical Hydrogen Doping of Nanocrystalline TiO2citations
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article
Charge Separation in BaTiO3 Nanocrystals: Spontaneous Polarization versus Point Defect Chemistry
Abstract
<p>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<sub>3</sub> (BTO) nanocrystals of cubic and tetragonal structure. Electron paramagnetic resonance (EPR) in combination with O<sub>2</sub> photoadsorption experiments show that BTO nanocrystals annealed at 600 °C have a charge separation yield enhanced by a factor > 10 compared to TiO<sub>2</sub> 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.</p>