一维范德华异质结构：非破坏性TEM揭示的生长机制和手性相关性
One-dimensional van der Waals Heterostructures: Growth Mechanism and Handedness Correlation Revealed by Non-destructive TEM
摘要：
在本论文中，我们对化学气相沉积法（CVD）合成的一维范德华异质结的结构细节和形成机理进行了跟踪和全面的研究。利用透射电子显微镜（TEM）可以清楚地观察到晶体的边缘结构、成核位置和晶体外延关系。这是通过在CVD兼容的Si/SiO2 TEM网格上直接合成heteronantubes来实现的，这使得能够无转移和非破坏性地访问许多固有的结构细节。特别是，我们已经区分了不同形状的氮化硼纳米管（BNNT）的边缘，这是确认，通过电子衍射在同一位置，严格关联到自己的手性角和极性。我们还证明了表面清洁和隔离的重要性，形成完美的一维异质结构。此外，我们阐明了单壁碳纳米管模板和BNNT晶体之间的手性相关性。这项工作不仅提供了对这种新的1D异质结构材料组的深入了解，而且从更一般的角度来看，作为对高度弯曲（几个nm的半径）原子衬底上晶体生长的有趣研究。
英文摘要：
In this work, we perform a follow-up and comprehensive study on the structural details and formation mechanism of chemical vapor deposition (CVD) synthesized one-dimensional (1D) van der Waals heterostructures. Edge structures, nucleation sites, crystal epitaxial relationships are clearly revealed using transmission electron microscopy (TEM). This is achieved by the direct synthesis of heteronanotubes on a CVD-compatible Si/SiO2 TEM grid, which enabled a transfer-free and non-destructive access to many intrinsic structural details. In particular, we have distinguished different shaped boron nitride nanotube (BNNT) edges, which are confirmed, by electron diffraction at the same location, to be strictly associated with its own chiral angle and polarity. We also demonstrate the importance of surface cleanness and isolation for the formation of perfect 1D heterostructures. Furthermore, we elucidate the handedness correlation between SWCNT template and BNNT crystals. This work not only provides an in-depth understanding of this new 1D heterostructure material group, but also, in a more general perspective, serves as an interesting investigation on crystal growth on highly curved (radius of a couple of nm) atomic substrates.
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