1. Department of Applied Physics, National University of Kaohsiung, Kaohsiung, Taiwan, Republic of China
2. Institute of Macromolecular Chemistry, CAS, Heyrovského nám. 2, 162 06 Prague, Czech Republic
3. Center for Nanoscience and Nanotechnology, Department of Chemical and Biological Engineering, School of Engineering and Applied Sciences, National University of Mongolia, Ulaanbaatar 14200, Mongolia