1. Key Laboratory of Nonferrous Materials and New Processing Technology, Ministry of Education, Guangxi Key Lab of Optical and Electronic Functional Materials and Devices, College of Materials Science and Engineering, Guilin University of Technology, Guilin, 541004, China
2. Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, China
3. School of Advanced Materials and Nanotechnology, Xidian University, Xi’an 710071, China
4. Shaanxi Province Key Laboratory for Electrical Materials and Infiltration Technology, School of Materials Science and Engineering, Xi’an University of Technology, Xi’an 710048, P. R. China