State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.
Nanoscale. 2014 Jul 21;6(14):7940-6. doi: 10.1039/c4nr00171k.
SrTiO₃ nanocubes and their hyperstable nanocrystalline sols were synthesized by a rapid sol-precipitation method under atmospheric pressure. Using triethylene glycol (TEG) to control the hydrolysis rate of tetrabutyl titanate, the SrTiO₃ nanocrystalline sol was obtained in as little time as 2 h. The formation kinetics of the SrTiO₃ nanocubes indicated that controlled hydrolysis is critical to the generation of a well defined cubic shape. The Fourier transform infrared (FT-IR) spectrum confirms the existence of TEG molecules on the surface of the particles and explains the high dispersion of the nanocubes in polar solvents. Owing to the large specific surface area (99.065 m(2) g(-1)), cubic SrTiO₃ nanocrystals showed enhanced photocatalytic activity. A high-quality SrTiO₃ nanocrystal film was prepared by spin-coating of the hyperstable sol at 100-160 °C, providing a new low-temperature route for the fabrication of perovskite thin films.
SrTiO₃纳米立方体及其超稳定纳米晶溶胶通过常压下的快速溶胶-沉淀法合成。使用三乙二醇（TEG）来控制钛酸四丁酯的水解速率，仅用 2 小时即可获得 SrTiO₃纳米晶溶胶。SrTiO₃纳米立方体的形成动力学表明，控制水解对于生成规则的立方形状至关重要。傅里叶变换红外（FT-IR）谱证实了颗粒表面上存在 TEG 分子，并解释了纳米立方体在极性溶剂中的高分散性。由于具有较大的比表面积（99.065 m² g⁻¹），立方 SrTiO₃纳米晶显示出增强的光催化活性。通过在 100-160°C 下旋涂超稳定溶胶制备了高质量的 SrTiO₃纳米晶薄膜，为制备钙钛矿薄膜提供了一种新的低温途径。
