Prah Uroš, Škofic Irena Kozjek
Acta Chim Slov. 2017 Dec;64(4):877-887. doi: 10.17344/acsi.2017.3497.
The temperature dependence of the anatase-to-rutile phase transition of TiO2 powders and thin films was studied. In order to shift the phase transition to higher temperature, samples were doped with a different amount of phosphate ions and their influence on the structure and thermal stability of the anatase phase was investigated. In addition, the effect of the catalyst form (powders or thin films) on the temperature of the anatase-to-rutile phase transition was observed. TiO2 thin films and powders were prepared using a simple sol-gel method with an alkoxide precursor and citric acid. The thin films were deposited on silicon and aluminum substrates using the dip-coating technique. The content of the anatase phase and the crystallite size at different annealing temperatures were monitored using X-ray diffraction. The course of the thermal decomposition was followed using thermal analyses. The morphology, particle size, shape and elemental makeup of the samples were investigated using scanning electron microscopy and energy-dispersive X-ray spectroscopy. The results showed that the phosphate ions successfully inhibited the growth of the anatase nanoparticles and delayed the phase transition to the rutile phase.
研究了TiO₂粉末和薄膜从锐钛矿相向金红石相转变的温度依赖性。为了将相变温度提高，对样品掺杂不同量的磷酸根离子，并研究其对锐钛矿相结构和热稳定性的影响。此外，还观察了催化剂形式（粉末或薄膜）对锐钛矿相向金红石相转变温度的影响。采用简单的溶胶-凝胶法，以醇盐前驱体和柠檬酸制备了TiO₂薄膜和粉末。利用浸涂技术将薄膜沉积在硅和铝基板上。使用X射线衍射监测不同退火温度下锐钛矿相的含量和微晶尺寸。通过热分析跟踪热分解过程。利用扫描电子显微镜和能量色散X射线光谱研究了样品的形貌、粒径、形状和元素组成。结果表明，磷酸根离子成功抑制了锐钛矿纳米颗粒的生长，并延迟了向金红石相的转变。
