Peking University - Electron Microscopy Laboratory, Pennsylvania State University - Department of Materials Science and Engineering, National Chung Hsing University - Department of Materials Science and Engineering, National Chiao Tung University - Department of Materials Science and Engineering, Peking University - Electron Microscopy Laboratory, Peking University - Electron Microscopy Laboratory, Peking University - Academy for Advanced Interdisciplinary Studies, Peking University - Electron Microscopy Laboratory, National Chiao-Tung University - Department of Material Science and Engineering, Pennsylvania State University - Department of Materials Science and Engineering and Peking University - Electron Microscopy Laboratory