1. School of Physics and Electronics, Henan University, Kaifeng 475004, People’s Republic of China
2. Henan Province Industrial Technology Research Institute of Resources and Materials, Zhengzhou University, 450001 Zhengzhou, People’s Republic of China
3. Department of Chemical Engineering, Texas Materials Institute, Center for Nano- and Molecular Science and Technology, The University of Texas at Austin, Austin, Texas 78712, United States