Yang Pu, Zhang Chen, Sun Wenyu, Dong Jia, Cao Duanyun, Guo Jing, Jiang Ying
College of Chemistry, Key Laboratory of Theoretical and Computational Photochemistry, Beijing Normal University, Beijing 100875, China.
Beijing Key Laboratory of Environmental Science and Engineering, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China.
Phys Rev Lett. 2022 Jul 22;129(4):046001. doi: 10.1103/PhysRevLett.129.046001.
Two-dimensional (2D) bilayer hexagonal ice (BHI) is regarded as the first intrinsic 2D ice crystal. However, the robustness of such a structure or its derivatives against surface symmetry and corrugation is still unclear. Here, we report the formation of 2D BHI on gold surfaces with 1D corrugation, using noncontact atomic force microscopy. The hexagonal arrangement of the first wetting layer was visualized on the Au(110)-1×2 surface. Upon depositing more water molecules, the first layer would rearrange and shrink, resulting in the formation of buckled BHI. Such a buckled BHI is hydrophobic despite the appearance of dangling OH, due to the strong interlayer bonding. Furthermore, the BHI is also stable on the Au(100)-5×28 surface. This work reveals the unexpected generality of the BHI on corrugated surfaces with nonhexagonal symmetry, thus shedding new light on the microscopic understandings of the low-dimensional ice formation on solid surfaces or under confinement.
二维（2D）双层六角冰（BHI）被视为首个本征二维冰晶。然而，这种结构或其衍生物对于表面对称性和波纹的稳健性仍不明确。在此，我们使用非接触原子力显微镜报告了在具有一维波纹的金表面上二维BHI的形成。在Au(110)-1×2表面上可视化了第一润湿层的六边形排列。沉积更多水分子后，第一层会重新排列并收缩，从而形成弯曲的BHI。尽管存在悬空的OH，但由于层间键合很强，这种弯曲的BHI是疏水的。此外，BHI在Au(100)-5×28表面上也很稳定。这项工作揭示了BHI在具有非六边形对称性的波纹表面上出人意料的普遍性，从而为在固体表面或受限条件下低维冰形成的微观理解提供了新的线索。
