1. Institute for Superconducting and Electronic Materials, Australian Institute for Innovative Materials, University of Wollongong, North Wollongong, New South Wales 2500, Australia
2. Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, PR China
3. Australian Research Council Centre of Excellence in Future Low-Energy Electronics Technologies, University of Wollongong, Wollongong, 2500 Australia
4. Faculty of Materials Engineering, Shandong Jianzhu University, Jinan, Shandong 250101, PR China
5. Electron Microscopy Centre, Australian Institute for Innovative Materials, University of Wollongong, North Wollongong, New South Wales 2500, Australia