Abstract: The adsorption behaviours of tryptophane on graphite (HOPG) have been investigated under low vacuum conditions at room temperature using scanning tunneling microscopy(STM). The acquired STM images exhibit that tryptophane can form a uniform adsorption layer at room temperature. Two kinds of structures were observed: two-dimensional stripe structure and two-dimensional monoclinic lattice. Possible models have been proposed for these two kinds of structures. The π stacking interactions between near tryptophane molecule's side chains are responsible for the formation of these two kinds of structures.

Key words: adsorption, scanning tunneling microscopy, Graphite, Tryptophane

摘要： 用扫描隧道显微镜(STM)研究了室温下色氨酸分子(L-Tryptophane)在石墨(HOPG)表面的吸附行为。实验发现，在室温下色氨酸分子可以在石墨表面形成均匀的吸附层，并形成二维条状结构和二维单斜晶格两种有序结构。针对这2种结构给出了可能的吸附模型。这2种有序结构的形成原因被认为与相邻色氨酸分子侧链之间的π堆积相互作用有关。

关键词: 表面吸附, 扫描隧道显微镜, 石墨, 色氨酸