1. Department of Chemical Technology, Faculty of Chemistry; Hanoi University of Science (HUS), Vietnam National University (VNU); 334 Nguyen Trai Thanh Xuan District Hanoi 10000 Vietnam
2. Laboratory for Materials and Engineering of Fibre Optics; Institute of Material Science (IMS), Vietnamese Academy of Science and Technology (VAST); 18 Hoang Quoc Viet Cau Giay District Hanoi 10000 Vietnam
3. International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS); 1-1 Namiki Tsukuba 105-0044 Japan