Yu You(由玉)1,2, Gong-Wei Lin(林功伟)1,†, Ling-Juan Feng(封玲娟)3, Yue-Ping Niu(钮月萍)1,4,‡, and Shang-Qing Gong(龚尚庆)1,4,§ 1Department of Physics, East China University of Science and Technology, Shanghai 200237, China 2School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China 3College of Sciences, Shanghai Institute of Technology, Shanghai 201418, China 4Shanghai Engineering Research Center of Hierarchical Nanomaterials, Shanghai 200237, China