High pressure induced atomic and mesoscale phase behaviors of one-dimensional TiO2 anatase nanocrystals
High pressure induced atomic and mesoscale phase behaviors of one-dimensional TiO2 anatase nanocrystals
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DOI：
10.1557/s43577-021-00250-w
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发表时间：
2022-04-12
期刊：
影响因子：
5
通讯作者：
Qin, Yang
中科院分区：
文献类型：
--
作者：
Meng, Lingyao;Duwal, Sakun;Qin, Yang
在这里，我们报道了有序的锐钛矿型二氧化钛(TiO2)纳米晶阵列的高压相和形貌行为。合成了一维纳米棒和纳米孔，并自组装成有序的介观结构。用原位同步加速器广角和小角X射线散射(WAXS和SAXS)技术研究了它们在原子尺度和介观尺度上的相变和相变。在原子尺度上，同步加速器WAXS显示，两个样品都发生了高达35 Gpa的压力诱导的不可逆非晶化，但起始压力不同。在介观尺度上，同步加速器SAXS在20 GPa时没有观察到明显的相变。有趣的是，在透射电子显微镜下，首次观察到在介观尺度上将二氧化钛纳米棒烧结成纳米正方形或纳米长方形，以及将纳米棒烧结成纳米线。这种压力诱导的纳米粒子非晶化和形态变化为设计和工程设计结构稳定的纳米材料提供了有价值的见解。
Here, we report the high pressure phase and morphology behavior of ordered anatase titanium dioxide (TiO2) nanocrystal arrays. One-dimensional TiO2 nanorods and nanorices were synthesized and self-assembled into ordered mesostructures. Their phase and morphological transitions at both atomic scale and mesoscale under pressure were studied using in situ synchrotron wide- and small-angle x-ray scattering (WAXS and SAXS) techniques. At the atomic scale, synchrotron WAXS reveals a pressure-induced irreversible amorphization up to 35 GPa in both samples but with different onset pressures. On the mesoscale, no clear phase transformations were observed up to 20 GPa by synchrotron SAXS. Intriguingly, sintering of TiO2 nanorods at mesoscale into nano-squares or nano-rectangles, as well as nanorices into nanowires, were observed for the first time by transmission electron microscopy. Such pressure-induced nanoparticle phase-amorphization and morphological changes provide valuable insights for design and engineering structurally stable nanomaterials.