Dependence of degree of orientation of copper oxide nuclei on oxygen pressure during initial stages of copper oxidation

作者：Luo Langli; Kang Yihong; Liu Zhenyu; Yang Judith C; Zhou Guangwen^*

来源：Physical Review B, 2011, 83(15): 155418.

DOI：10.1103/PhysRevB.83.155418

We report in situ transmission electronmicroscopy observations of the dependence of the degree of orientations of oxide nuclei on oxygen pressure during the initial-stage oxidation of Cu(100) surfaces, which reveal a transition from nucleating epitaxial Cu2O islands to randomly oriented oxide islands with increasing the oxygen pressure from 5 x 10(-5) to 150 Torr. We show by a kinetic model that this transition of oxide nucleation orientation is driven by the influence of oxygen pressure on the oxide nucleation barrier and atom collision rate.

• 出版日期2011-4-11