Atomic-scale observation of a two-stage oxidation process in Cu2O
oxidation, in situ electron microscopy, Cu2O, intermediated phases
ABSTRACT Atomic-scale oxidation dynamics of Cu2O nanocrystallines (NCs) are directly observed by in situ high-resolution transmission electron microscopy. A two-stage oxidation process is observed: (1) The initial oxidation stage is dominated by the dislocation-mediated oxidation behavior of Cu2O NCs via solid-solid transformations, leading to the formation of a new intermediate CuOx phase. The possible crystal structure of the CuOx phase is discussed. (2) Subsequently, CuOx is transformed into CuO by layer-by-layer oxidation. These results will help in understanding the oxidation mechanisms of copper oxides and pave the way for improving their structural diversity and exploiting their potential industrial applications.
Tsinghua University Press
Huihui Liu,He Zheng,Lei Li,Huaping Sheng,Shuangfeng Jia,Fan Cao,Xi Liu,Boyun Chen,Ru Xing,Dongshan Zhao,Jianbo Wang, Atomic-scale observation of a two-stage oxidation process in Cu2O. NanoRes.2017, 10(7): 2344–2350