Facile, high yield ultrasound mediated protocol for ZnO hierarchical structures synthesis: Formation mechanism, optical and photocatalytic properties

摘要: Hierarchical flowers-like zinc oxide structures have been successfully obtained by a simple and fast ultrasound-assisted method performed in ordinary ultrasonic bath using an ammonia solution acetate, the absence of any surfactant or template. The composition, structure, crystallinity, morphology optical properties materials at different ultrasound irradiation times were characterized infrared, UV–Vis photoluminescence spectroscopy, X-ray diffraction, scanning transmission electron microscopy investigations. It was proved that time manipulates both defect content (implicit photoluminescent properties) ZnO materials: shorter leads to synthesis high-defected flower with triangular-shaped petals, while higher favours formation low-defected tipped rod-like petals. A plausible growth mechanism architectures implies aggregation via oriented attachment followed Ostwald ripening is advanced based on these results. flower-like present high photocatalytic activities, total phenol mineralization being registered case visible light experiments. Electron-spin resonance measurements demonstrate generation reactive oxygen species, namely hydroxyl radicals but also C centred adducts derived most probable from residual acetate adsorbed surface.