1. Hunan Provincial Key Laboratory of Thin Film Materials and Devices, School of Material Sciences and Engineering, Xiangtan University, Xiangtan, Hunan 411105, P. R. China
2. State Key Laboratory of Silicate Materials for Architectures (SMART), Wuhan University of Technology, 122 Luoshi Road, Hongshan, Wuhan, Hubei 430070, P. R. China