Abstract: Amino acid is the building block of protein and its adsorption on the surface of metal provides the model for the study of the interaction of protein with metal. Due to the adsorption of amino acid, the modification of morphology such as variation of reconstruction or faceting may happen on the entire metal surface. The induced formation and motion of copper steps on the surface of Cu (111) covered with glycine occur in the area where has been scanned by scanning tunneling microscope (STM) with higher negative bias voltage (|V_b|>2.5V). And the role of glycine in the modification of surface morphology is also discussed.

Key words: glycine, Cu(111), scanning tunneling microscopy, modification of surface morphology

摘要： 氨基酸是蛋白质的构成单元，它在金属表面的吸附为研究蛋白质同金属相互作用奠定了基础。吸附了氨基酸的金属表面会发生诸如重构改变或小面化等形貌的变化，但这些变化在吸附了氨基酸的全部金属表面都能够发生。在较大负偏压(|V_b|＞2.5V)的条件下使用扫描隧道显微镜(STM)扫描吸附有甘氨酸的Cu(111)表面，在扫描区域内原有铜台阶的形状发生了变化并产生了新的铜台阶。本文对甘氨酸在铜表面形貌变化中所起的作用进行了讨论。

关键词: 甘氨酸, Cu(111), 扫描隧道显微镜, 表面形貌变化