1. School of Materials Science and Engineering
2. Tianjin University
3. Tianjin
4. P. R. China
5. National Laboratory of Solid State Microstructures
6. Division of Advanced Nanomaterials
7. Joint Key Laboratory of Functional Nanomaterials and Devices
8. Key Laboratory of Nanodevices and Applications
9. CAS Center for Excellence in Nanoscience
10. Suzhou Institute of Nano-tech and Nano-bionics
11. College of Engineering and Applied Sciences
12. Collaborative Innovation Center of Advanced Microstructures
13. Nanjing University
14. Nanjing 210093