1. College of Materials Science & Engineering, Hebei University of Science and Technology, Shijiazhuang 050016, China
2. Hebei Key Laboratory of Flexible Functional Material, Shijiazhuang 050016, China
3. College of Physics Science & Information Engineering, Hebei Normal University, Shijiazhuang 050024, China
4. Key Laboratory of Advanced Films of Hebei Province, Shijiazhuang, Hebei 050024, China