1. Fachgebiet Angewandte Nanophysik, Institut für Physik & ZMN MacroNano (ZIK), Technische Universität Ilmenau, Ilmenau 98693, Germany
2. College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, Zhejiang 325035, China
3. Department of Chemistry, University College London, London WC1H 0AJ, U.K.
4. College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China
5. Central Facility for Electron Microscopy, Electron Microscopy Group of Materials Science, Ulm University, Ulm 89081, Germany