1. Key Laboratory for Special Function Materials & Structural Design of the Ministry of Education
2. School of Physical Science & Technology
3. Lanzhou University
4. Lanzhou 730000
5. China
6. State Key Laboratory of Applied Organic Chemistry
7. College of Chemistry and Chemical Engineering
8. Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province
9. Lanzhou
10. Key Laboratory of Flexible Electronics
11. Institute of Adv. Mater.
12. Nanjing Tech University
13. Nanjing 211816