1. Laboratory of Printable Functional Nanomaterials and Printed Electronics
2. School of Printing and Packaging
3. Wuhan University
4. Wuhan 430072
5. P. R. China
6. Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education
7. School of Physics and Technology
8. State Key Laboratory for Powder Metallurgy
9. Central South University
10. Changsha 410083
11. Department of Physics and Materials Science and Center of Super-Diamond and Advanced Films (COSDAF)
12. City University of Hong Kong
13. Hong Kong SAR