Open AccessADSORPTION OF ASPARTIC ACID ON Cu(001) STUDIED BY SCANNING TUNNELING MICROSCOPY
Author(s) -
Hao Wang,
Xueying Zhao,
Weiping Yang
Publication year - 2000
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.49.1316
Subject(s) - scanning tunneling microscope , aspartic acid , adsorption , overlayer , glycine , materials science , alanine , phenylalanine , molecule , crystallography , amino acid , chemistry , nanotechnology , organic chemistry , biochemistry
Scanning tunneling microscopy (STM) has been used to study the adsorption of aspartic acid on the Cu(001) surface at room temperature.At lower coverage,there ex ist two different bonding states and the corresponding diffusion activation ener gies are 079±001eV and 088±005eV,respectively.When the coverage is inc reased,the aspartic acid molecules can finally form an overlayer with uniform co ntrast but could never form any ordered structures.It has been also found that t he adsorption of aspartic acid cannot make steps faceted.It is interesting that all these features are quite different from the adsorption behaviors of other am ino acids on Cu(001),such as glycine,alanine,phenylalanine and lysine,which do n ot have the β-caboxylate.