1. Engineering Research Center of Nano-Geomaterials of Ministry of Education, Faculty of Materials Science and Chemistry, China University of Geosciences, 388 Lumo Road, Wuhan 430074, P. R. China
2. State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China
3. Graduate Institute of Nanomedicine and Medical Engineering and International Ph.D. Program in Biomedical Engineering, College of Biomedical Engineering, Taipei Medical University, Taipei 110, Taiwan
4. National Synchrotron Radiation Research Center, Hsinchu 300, Taiwan
5. School of Applied Physics and Materials, Wuyi University, Jiangmen, Guangdong 529020, P. R. China