1. Platform for Characterization and Test; Institute of Nano-tech and Nano-bionics; Chinese Academy of Sciences; Suzhou 215123 People's Republic of China
2. College of Physics & The Cultivation Base for State Key Laboratory; Qingdao University; No. 308 Ningxia Road Qingdao 266071 People's Republic of China
3. Laboratory of Advanced Materials and Electron Microscopy; Institute of Physics; Chinese Academy of Sciences; Beijing 100080 People's Republic of China
4. School of Materials Science and Engineering; University of Jinan; Jinan 250022 People's Republic of China