Van Hieu Nguyen 1Dinh Hoi Bui 2Thi Thu Phuong Le 2 1 Inst. of Mater. Sci. & Adv. Center of Phys.HanoInstitute of Materials Science and Advanced Center of Physics18 Hoang Quoc VietCau GiayVietnam 2 Coll. of Educ.Hue Univ.Advances in Natural Sciences: Nanoscience &Nanotechnology...