In situ ion irradiation of amorphous TiO2 nanotubes
In situ ion irradiation of amorphous TiO2 nanotubes
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DOI：
10.1557/s43578-022-00516-2
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发表时间：
2022-02
影响因子：
2.7
通讯作者：
Chao Yang;Tristan T. Olsen;Miu Lun Lau;Kassiopeia A. Smith;K. Hattar;Amrita Sen;Yaqiao Wu;Dewen Hou;B. Narayanan;Min Long;J. Wharry;H. Xiong
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文献类型：
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作者：
Chao Yang;Tristan T. Olsen;Miu Lun Lau;Kassiopeia A. Smith;K. Hattar;Amrita Sen;Yaqiao Wu;Dewen Hou;B. Narayanan;Min Long;J. Wharry;H. Xiong
了解纳米材料的结构和形态演化对于为能量转换和存储等应用定制其功能至关重要。在这里，我们利用高分辨透射电子显微镜、原位离子辐照电子显微镜和分子动力学(MD)模拟手段，研究了辐照对非晶态二氧化钛纳米管和锐钛矿型二氧化钛纳米管的形貌和结构的影响。锐钛矿型二氧化钛纳米管在辐照下表现出形态和结构的稳定性，这是因为它们在缺陷下沉时具有高度的晶界和表面。另一方面，非晶态的二氧化钛纳米管经历了辐射诱导的晶化，一些管子只剩下部分晶化。MD计算表明，部分结晶管的弯曲是由于与结晶过程中的致密化相关的内应力所致。这些结果为潜在地调节储能材料的结构和形貌提供了一种基于辐射的新途径。
Understanding of structural and morphological evolution in nanomaterials is critical in tailoring their functionality for applications such as energy conversion and storage. Here, we examine irradiation effects on the morphology and structure of amorphous TiO2 nanotubes in comparison with their crystalline counterpart, anatase TiO2 nanotubes, using high-resolution transmission electron microscopy (TEM), in situ ion irradiation TEM, and molecular dynamics (MD) simulations. Anatase TiO2 nanotubes exhibit morphological and structural stability under irradiation due to their high concentration of grain boundaries and surfaces as defect sinks. On the other hand, amorphous TiO2 nanotubes undergo irradiation-induced crystallization, with some tubes remaining only partially crystallized. The partially crystalline tubes bend due to internal stresses associated with densification during crystallization as suggested by MD calculations. These results present a novel irradiation-based pathway for potentially tuning structure and morphology of energy storage materials.