Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 6: Water on Surfaces
O 6.7: Vortrag
Montag, 1. April 2019, 12:15–12:30, H16
Visualizing the atomic edge structure of a two-dimensional ice with atomic force microscopy — •Runze Ma1, Duanyun Cao1, Chongqin Zhu2, Ye Tian1, Xiaocheng Zeng2, Limei Xu1,3, Enge Wang1,3, and Ying Jiang1,3 — 1International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, P. R. China — 2Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE 68588, United States — 3Collaborative Innovation Center of Quantum Matter, Beijing 100871, P. R. China
Low-dimensional water is responsible for a broad spectrum of phenomena in materials science, nanoscience, chemistry, biology, and geology. Especially, the edges of ice play key roles in the ice growth/melting, catalytic reaction and molecular adsorption, but atomic-scale structural characterization still remains a big challenge so far due to the fragileness and high reactivity of the ice edges.
Here we report atomic-scale imaging of the edge structures of a two-dimensional bilayer ice grown on Au(111) surface with non-contact atomic force microscopy. We found that the armchair edges coexist with the zigzag ones, with almost comparable population. We were able to deduce diff erent growth behaviors for the zigzag and armchair edges from the frozen metastable or intermediate structures at the two edges.
This work not only reveals new understanding of the stability and growth of two-dimensional ices, but also opens up new possibility of probing structure and dynamics of "ice at the edge" in real space.