| 초록 |
Controlled synthesis of nanostructured materials using facile and easily scalable synthesis techniques is highly attractive for large-scale production of nanomaterials. In this regard, molten salt synthesis is a well-established technique for large-scale production of nanostructured materials. Few reports have demonstrated the applicability of the molten salt technique for high-aspect-ratio one dimensional rutile TiO2 synthesis. The reports indicated that the presence of phosphate additive is crucial to the 1-D growth of rutile TiO2 in the molten NaCl. However, plausible explanation has not been given as to how the phosphate contribute to the 1-D growth. In solution-based synthesis, like molten salt synthesis, the solubility of the precursor has great impact on the phase and morphology of the finial powder. To enhance the solubility of precursors, mineralizers and complexing agents are usually employed. According to Lux-Flood acid base definition, acid base interaction in molten salt involves oxygen ion transfer. Thus, oxygen-containing additives can act as mineralizer in case of molten salt synthesis. Here in this study, various sets of experiments have been done to investigate 1-D rutile TiO2 crystal growth starting from anatase TiO2 precursors in molten NaCl with the presence of various inorganic oxy-additives. The effects of different oxy-additives on the O2- ion activity of the molten salt matrix and the consequent phase and morphology of the final powder were analyzed. Plausible explanation were also given as to how O2- ion activity affect the phase and morphology of the final powder. |
