Influence of Glycine Adsorption on Segregation of Ni-Cu(110)Surface

摘要

An atomic group model of the disordered binary alloy Ni_xCu_(1-x);(x=0. 4)was constructed to investigate surface segregation. According to the model,the electronic structure of the Ni_xCu_(1-x)alloy surface was calculated by the Recursion method when glycine atoms are adsorbed on the Ni_xCu_(1-x)(HO)surface under the condition of 0. 33 coverage. The calculation results indicate that Cu is segregated on the surface of the Ni_xCu_(1-x)alloy,and the chemisorption of glycine restrains the segregation. In addition,the chemical adsorption of glycine greatly changes the density of states of the alloy surface near the Fermi level,and there is electric charge transfer between the alloy surface and the glycine.