Than, Ha An Quoc, Institute of Applied Materials Science, Vietnam Academy of Science and Technology, No 1A TL 29, Thanh Loc Ward, District 12, Ho Chi Minh 700000, Vietnam and Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Ha Noi 10072, Vietnam, Viet Nam