1. School of Nano‐Tech and Nano‐Bionics University of Science and Technology of China 398 Jinzhai Road Hefei 230026 P. R. China
2. Printable Electronic Research Center Suzhou Institute of Nano‐Tec and Nano‐Bionics Chinese Academy of Sciences (CAS) 398 Ruoshui Road, SEID, SIP Suzhou 215123 P. R. China
3. School of Science School of Advanced Technology Xi'an Jiaotong‐Liverpool University Suzhou 215123 China
4. Vacuum Interconnected Nanotech Workstation Suzhou Institute of Nano‐Tec and Nano‐Bionics Chinese Academy of Sciences (CAS) 398 Ruoshui Road, SEID, SIP Suzhou 215123 P. R. China
5. Nano‐Devices and Materials Division Suzhou Institute of Nano‐Tech and Nano‐Bionics Chinese Academy of Sciences (CAS) 398 Ruoshui Road, SEID, SIP Suzhou 215123 P. R. China
6. Physics and Center for Functional Materials Faculty of Science and Technology Åbo Akademi University Porthaninkatu 3 Turku 20500 Finland