Vasiljević Zorka Ž, Dojčinović Milena P, Vujančević Jelena D, Spreitzer Matjaž, Kovač Janez, Bartolić Dragana, Marković Smilja, Janković-Čaštvan Ivona, Tadić Nenad B, Nikolić Maria Vesna
Institute for Multidisciplinary Research, University of Belgrade Serbia
Institute of Technical Sciences of the Serbian Academy of Sciences and Arts Serbia.
RSC Adv. 2021 Oct 1;11(51):32358-32368. doi: 10.1039/d1ra05748k. eCollection 2021 Sep 27.
Nanostructured FeTiO (pseudobrookite), a mixed metal oxide material holds significant promise for utilization in energy and environmental applications. However, its full application is still hindered due to the difficulty to synthesize monophasic FeTiO with high crystallinity and a large specific surface area. Herein, FeTiO nanofibers were synthesized a versatile and low-cost electrospinning method, followed by a calcination process at different temperatures. We found a significant effect of the calcination process and its duration on the crystalline phase in the form of either pseudobrookite or pseudobrookite-hematite-rutile and the morphology of calcined nanofibers. The crystallite size increased whereas the specific surface area decreased with an increase in calcination temperature. At higher temperatures, the growth of FeTiO nanoparticles and simultaneous coalescence of small particles was noted. The highest specific surface area was obtained for the sample calcined at 500 °C for 6 h ( = 64.4 m g). This work opens new opportunities in the synthesis of FeTiO nanostructures using the electrospinning method and a subsequent optimized calcination process for energy-related applications.
纳米结构的钛铁矿（假板钛矿），一种混合金属氧化物材料，在能源和环境应用中具有巨大的应用前景。然而，由于难以合成具有高结晶度和大比表面积的单相钛铁矿，其全面应用仍然受到阻碍。在此，通过一种通用且低成本的静电纺丝方法合成了钛铁矿纳米纤维，随后在不同温度下进行煅烧处理。我们发现煅烧过程及其持续时间对以假板钛矿或假板钛矿 - 赤铁矿 - 金红石形式存在的晶相以及煅烧纳米纤维的形态有显著影响。随着煅烧温度的升高，微晶尺寸增大而比表面积减小。在较高温度下，观察到钛铁矿纳米颗粒的生长以及小颗粒的同时聚结。在500°C煅烧6小时的样品获得了最高比表面积（ = 64.4 m²/g）。这项工作为使用静电纺丝方法和随后优化的煅烧工艺合成用于能源相关应用的钛铁矿纳米结构开辟了新机会。
