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Zindrou, Areti; Psathas, Pavlos; Deligiannakis, Yiannis
Nanomaterials (Basel, Switzerland), 02/2024, Letnik: 14, Številka: 4Journal Article
Engineering of oxygen vacancies (Vo) in nanomaterials allows diligent control of their physicochemical properties. SrTiOsub.3 possesses the typical ABOsub.3 structure and has attracted considerable attention among the titanates due to its chemical stability and its high conduction band energy. This has resulted in its extensive use in photocatalytic energy-related processes, among others. Herein, we introduce the use of Flame Spray Pyrolysis (FSP); an industrial and scalable process to produce Vo-rich SrTiOsub.3 perovskites. We present two types of Anoxic Flame Spray Pyrolysis (A-FSP) technologies using CHsub.4 gas as a reducing source: Radial A-FSP (RA-FSP); and Axial A-FSP (AA-FSP). These are used for the control engineering of oxygen vacancies in the SrTiOsub.3-x nanolattice. Based on X-ray photoelectron spectroscopy, Raman and thermogravimetry-differential thermal analysis, we discuss the role and the amount of the Vos in the so-produced nano-SrTiOsub.3-x , correlating the properties of the nanolattice and energy-band structure of the SrTiOsub.3-x . The present work further corroborates the versatility of FSP as a synthetic process and the potential future application of this process to engineer photocatalysts with oxygen vacancies in quantities that can be measured in kilograms.
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