Open AccessADSORPTION OF GLYCINE ON Cu(111) INVESTIGATED BY SCANNING TUNNELING MICROSCOPY
Author(s) -
Hao Yan,
Zhao Xueying,
Zhao Ru-Guang,
Weiping Yang
Publication year - 2001
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.50.1964
Subject(s) - scanning tunneling microscope , superstructure , annealing (glass) , materials science , adsorption , hexagonal crystal system , glycine , deposition (geology) , chemical physics , quantum tunnelling , crystallography , nanotechnology , chemistry , optoelectronics , thermodynamics , physics , composite material , paleontology , biochemistry , amino acid , sediment , biology
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.