1. School of Materials Science and Engineering & Guangxi Key Laboratory of Information Materials Guilin University of Electronic Technology Guilin 541004 P. R. China
2. Zhongshan Branch of State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China Zhongshan Institute Zhongshan 528402 P. R. China
3. Guilin Key Laboratory of Microelectronic Electrode Materials and Biological Nanomaterials & National Special Mineral Materials Engineering Technology Research Center & Guangxi Key Laboratory of Superhard Materials China Monferrous Metal (Guilin) Geology and Mining Co., Ltd Guilin 541004 P. R. China
4. Guangxi Key Laboratory of Precision Navigation Technology and Application Guilin University of Electronic Technology Guilin 541004 P. R. China