1. Electronic Materials Research Laboratory & Multifunctional Materials and Structures, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, School of Electronic Science and Engineering, Xi’an Jiaotong University, Xi'an, Shaanxi 710049, China
2. State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, P. R. China
3. State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi’an 710049, Shaanxi, China
4. International Research Centre for Renewable Energy, State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi’an, Shaanxi 710049, China
5. Electronical Information Materials and Devices Engineering Research Center of the Ministry of Education, Guangxi Key Laboratory of Information Materials, and School of Material Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China