1. Group for Molecular Engineering of Functional Materials; EPFL Valais Wallis; CH-1951 Sion Switzerland
2. Qingdao Institute of Bioenergy and Bioprocess Technology; Chinese Academy of Sciences; Qingdao 266101 P. R. China
3. CAS Key Laboratory of Design and Assembly of Functional Nanostructures; Fujian Institute of Research on the Structure of Matter; Chinese Academy of Sciences; Fuzhou 350002 P. R. China
4. Interdisciplinary Centre for Electron Microscopy; EPFL; CH-1015 Lausanne Switzerland