Low-Temperature Orientationally Ordered Structures of Two-Dimensional C60

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• 作者：Lan-Feng Yuan ; Jinlong Yang ; Haiqian Wang ; Changgan Zeng ; Qunxiang Li ; Bing Wang ; J. G. Hou ; Qingshi Zhu ; and D. M. Chen
• 刊名：Journal of the American Chemical Society
• 出版年：2003
• 出版时间：January 8, 2003
• 年：2003
• 卷：125
• 期：1
• 页码：169 - 172
• 全文大小：158K
• 年卷期：v.125,no.1(January 8, 2003)
• ISSN：1520-5126

文摘

Orientationally ordered structures of two-dimensional (2D) C₆₀ at low temperature have beeninvestigated theoretically and experimentally. Using total energy optimization with a phenomenologicalpotential, we find the ground state is a close packed hexagonal lattice in which all the molecules have thesame orientation. Several local minima of the potential energy surface are found to be associated withother 1×1 lattices as well as 2×2 lattices. The energies of the orientational domain boundaries of the 1×1lattices are also computed, and two kinds of which yield negative values. A majority of these theoreticalfindings are confirmed by our low-temperature scanning tunneling microscopy study of a 2D C₆₀ arraysupported on a self-assembled monolayer.