【摘要】 用超高真空扫描隧道显微镜 (UHV -STM)研究了室温下甘氨酸在Cu( 111)表面的吸附行为 .实验发现 ,在低覆盖度下甘氨酸分子在表面表现为二维气体 .当覆盖度足够高时 ,甘氨酸分子最终会形成二维固相结构 ,为 ( 4× 8)超结构 .针对这种结构提出了两种可能的结构模型 ,模型能够很好地解释STM图 .当覆盖度介于气相和固相之间时 ,根据蒸镀条件和退火条件的不同 ,表面可能出现两种不同的中间相 ,一种为条纹结构 ,另一种为六角结构 ,对于中间相有待于进一步的研究更多还原

【Abstract】 The adsorption behaviours of glycine on Cu(111) have been investigated under ultra high vacuum conditions at room temperature using scanning tunneling microscopy(STM). At lower coverage, it has been found that glycine can form only a two dimensional gas phase on the Cu(111) surface. When the coverage is high enough, glycine will form a two dimensional solid phase, i.e., the (4×8) superstructure. Two possible models have been proposed for the (4×8) superstructure. The models can explain STM images well. In addition, in a coverage range between those of the gas and solid phases, two intermediate phases are formed depending on different conditions of deposition and annealing. One is a stripe structure; the other is a hexagonal structure. To understand these intermediate phases further investigations are needed.更多还原