Liaoning Provincial Key Laboratory of Metallurgical Resources Circulation Science, Institute of Metallurgy, Northeastern University, Shenyang 110819, People's Republic of China.
Nanotechnology. 2018 Sep 21;29(38):385605. doi: 10.1088/1361-6528/aacfde. Epub 2018 Jun 28.
Perovskite-type oxides have become the hotspots of functional materials due to their various excellent performances. As a typical material with a perovskite structure, CaTiO (CTO) possesses a similar band gap to TiO with less defects and recombination centers, which makes it a promising alternative material to TiO. In particular, the CTO nanotube structure has a large specific surface area and unique photochemical and electron-transport properties, and these advantages further expand its application range. In this paper, a highly ordered and vertically aligned CTO nanotube array was successfully synthesized by a simple hydrothermal method with TiO nanotube (TNT) arrays as the precursor. It was found that the CTO nanotube had a higher optical absorption ability (3.4 eV), photovoltage (500 mV) and photocurrent density (0.004 A cm) under ultraviolet irradiation, compared to the TNT (350 mV and 0.0036 A cm). At the same time, the electrochemical impedance spectroscopy, Mott-Schottky and stability tests indicate that the CTO nanotube might be a promising alternative choice as the photoelectric material for a TNT.
钙钛矿型氧化物由于其各种优异的性能而成为功能材料的热点。作为一种具有钙钛矿结构的典型材料，CaTiO（CTO）具有与 TiO 相似的能带隙，同时具有较少的缺陷和复合中心，这使其成为 TiO 的一种有前途的替代材料。特别是，CTO 纳米管结构具有较大的比表面积和独特的光化学和电子输运特性，这些优势进一步扩大了其应用范围。本文采用简单的水热法，以 TiO 纳米管（TNT）阵列为前驱体，成功合成了高度有序且垂直排列的 CTO 纳米管阵列。研究发现，在紫外光照射下，CTO 纳米管具有更高的光吸收能力（3.4 eV）、光电压（500 mV）和光电流密度（0.004 A cm），而 TNT 的光电压和光电流密度分别为 350 mV 和 0.0036 A cm。同时，电化学阻抗谱、Mott-Schottky 和稳定性测试表明，CTO 纳米管可能是 TNT 光电材料的一种有前途的替代选择。
