六方氮化硼
互易晶格
热膨胀
化学气相沉积
材料科学
凝聚态物理
异质结
格子(音乐)
氮化硼
范德瓦尔斯力
负热膨胀
外延
衍射
纳米技术
石墨烯
图层(电子)
结晶学
化学
光学
物理
复合材料
有机化学
分子
声学
作者
Marko A. Kriegel,Karim M. Omambac,Steffen Franzka,F.-J. Meyer zu Heringdorf,M. Horn‐von Hoegen
标识
DOI:10.1016/j.apsusc.2023.157156
摘要
The emerging field of straintronics, i.e., the control and utilization of the strain state of 2D-materials, is of great importance for their technological development, specifically in view of their future incorporation into van der Waals heterostructures. To gain fundamental insight into structural peculiarities of two-dimensional systems, single layer hexagonal boron nitride (hBN) grown on Ir(1 1 1) by chemical vapor deposition was used as a prototypical model system: High-resolution reciprocal space mapping reveals the incommensurate nature of the material system by measuring the hBN in plane lattice parameter with high precision, facilitated by the moiré magnification effect in electron diffraction. In a growth temperature (Tg) regime of 700–1150°C an average lattice parameter of 2.496 ± 0.006 Å was found. Eventually, careful disentanglement of the hBN's and substrate's behavior for rising Tg allowed the determination of a negative thermal expansion coefficient of αhBN = −2.4 ± 1.2 × 10-6 K−1 for free-standing hBN.
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