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Musso, Maurizio
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Publications (6/6 displayed)
- 2023Charge Separation in BaTiO3 Nanocrystals: Spontaneous Polarization versus Point Defect Chemistrycitations
- 2023Titania Hybrid Carbon Spherogels for Photocatalytic Hydrogen Evolutioncitations
- 2021Chemical constitution of polyfurfuryl alcohol investigated by FTIR and Resonant Raman spectroscopycitations
- 2020Morphology-Graded Silicon Nanowire Arrays via Chemical Etchingcitations
- 2020Effects of the infill pattern on mechanical properties of fused layer modeling (FLM) 3D printed wood/polylactic acid (PLA) compositescitations
- 2020Larch wood residues valorization through extraction and utilization of high value-added productscitations
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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>