1. Clean EneElectronicrgy Materials and Engineering Center
2. School of Microelectronics and Solid-State Electronics
3. University of Electronic Science and Technology of China
4. Chengdu 611731
5. P. R. China
6. Key Laboratory of Resources Chemistry of Nonferrous Metals
7. Ministry of Education
8. College of Chemistry and Chemical Engineering
9. Central South University
10. Changsha 410083
11. College of Chemistry and Materials Science
12. Sichuan Normal University
13. Chengdu