Mr. Xu wei is a master in Nanjing University of Aeronautics and Astronautics (NUAA). His research interests lie in synthesis of noble metal nanostructures. Corresponding author, E-mail address: cxkan@nuaa, edu. cn.Prof. Kan Caixia is a professor in NUAA. Her research interests focus on nanomaterials and nanostructures. Ms. Ni Yuan is a doctoral candidate of NUAA. Her research interests lie in noble metals nanostructures. Mr. Ke Junhua is a master in NUAA. His research interests lie in synthesis of noble metal nanostructures.