Jagminas Arūnas, Ramanavičius Simonas, Jasulaitiene Vitalija, Šimėnas Mantas
State Research Institute Centre for Physical Sciences and Technology Sauletekio Ave. 3 LT-10257 Vilnius Lithuania
Faculty of Physics, Vilnius University Sauletekio Ave. 9 LT-10222 Vilnius Lithuania.
RSC Adv. 2019 Dec 9;9(69):40727-40735. doi: 10.1039/c9ra08463k. eCollection 2019 Dec 3.
At the present time, the formation of titanium monoxide (TiO ) two dimensional (2D) species with distinct composition, size, shape, and a significantly reduced bandgap ( ) value compared to TiO is of great scientific and practical importance. This paper describes our findings investigating Ti surface oxidation for the formation of TiO films possessing a densely-packed nanoplatelet morphology and a low bandgap value. This goal was herein achieved by the hydrothermal treatment of the Ti surface in selenious acid solution kept at a slightly alkaline pH. Furthermore, the nanoplatelet design not typical for TiO porous films was created by this method for the first time. The formation of titanium monoxide, particularly TiO, as a major crystalline phase, was verified by XRD and confirmed by EPR investigations. It is worth noting that these nanoplatelet-shaped films with a thickness of 0.1-0.25 μm exhibited a very large shift of their light absorption threshold, down to 1.29 eV, compared to the of anatase TiO and a surprising 70% porosity determined simulation of experimental reflection plots. It is anticipated that this unique TiO nanomaterial will pave the way for new investigations and applications.
目前，与TiO相比，具有独特组成、尺寸、形状且带隙（ ）值显著降低的二维（2D）一氧化钛（TiO ）物种的形成具有重大的科学和实际意义。本文描述了我们对Ti表面氧化进行研究的结果，以形成具有密集堆积纳米片形态和低带隙值的TiO 薄膜。这一目标是通过在保持略碱性pH值的亚硒酸溶液中对Ti表面进行水热处理来实现的。此外，这种方法首次创造了TiO多孔薄膜不典型的纳米片设计。通过XRD验证了作为主要晶相的一氧化钛，特别是TiO的形成，并通过EPR研究得到证实。值得注意的是，这些厚度为0.1 - 0.25μm的纳米片形状的薄膜与锐钛矿TiO的 相比，其光吸收阈值有非常大的偏移，低至1.29eV，并且通过对实验反射图的模拟确定其孔隙率高达70%，令人惊讶。预计这种独特的TiO 纳米材料将为新的研究和应用铺平道路。
