2024 年 73 巻 6 号 p. 463-469
Yttria-stabilized zirconia (YSZ) nanoparticles were synthesized using a flow-type supercritical hydrothermal method using different alkaline reagents. The obtained YSZ nanoparticles had a tetragonal phase and a primary particle size of 4–6 nm. The synthesized nanoparticles were characterized using optical microscopy, elemental composition analysis, X-ray diffraction, transmission electron microscopy, and surface area measurements. The choice of alkaline reagent significantly played a crucial role in influencing the particle size and impurity contents of YSZ nanoparticles. Each sample contained several impurities, which were derived from alkaline reagents, and tubing elements that were corroded under subcritical and supercritical conditions. However, titanium was not detected in the YSZ nanoparticles synthesized using titanium-lined reaction tubes. The findings highlight the importance of alkaline reagents and tube materials in controlling the quality of synthesized nanoparticles. Moreover, this study provides valuable insights for the synthesis of YSZ nanoparticles using the supercritical hydrothermal method to control contamination by impurities.
