1. Guangxi Key Laboratory of Information Materials, Guangxi Collaborative Innovation Center of Structure and Property for New Energy and Materials, School of Material Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, P. R. China
2. School of Electronic Engineering and Automation, Guilin University of Electronic Technology, Guilin 541004, P. R. China
3. School of Chemical Engineering, Changsha University of Science and Technology, Changsha 410076, P. R. China