| 초록 |
Recently, through theoretical and experimental studies, it has been reported that defect engineering is a promising strategy for improving piezo-catalytic performance by modulating the electronic structure of metal oxide. However, in spite of active studies, reported researches has been mainly focused on the reduction-based methods which require harsh chemical agents and multi-step processes to induce oxygen vacancies and/or low valence metal species. Although a few researchers have been reported partial oxidation methods from the low valence state precursor in order to develop a synthetic route compatible with the cost-effective process, it is still remained a challenge to synthesize defect-rich multi-component materials. In this study, a simple synthetic strategy for defect-rich binary metal oxide was proposed. BaTiO3, which is still limited to practical piezo-catalytic decontamination due to its poor carrier concentration, was adopted as a model system and oxygen-deficient TiO2 (so-called black TiO2) was used as a starting material with the BaCO3 in order to control the final oxidation state. BaTiO3 nanoparticles with controllable contents of oxygen vacancy were successfully synthesized by solid-state reaction of this mixture in the different atmosphere. Then, the correlation between physicochemical property and piezo-catalytic performance was systematically investigated by various analysis methods. |
