title: Synthesis of silver octahedra with controlled sizes and optical properties via seed-mediated growth.
abstract: Silver octahedra with edge lengths controlled in the range of 20-72 nm were synthesized via seed-mediated growth. The key to the success of this synthesis is the use of single-crystal Ag seeds with uniform and precisely controlled sizes to direct the growth and the use of citrate as a selective capping agent for the {111} facets. Our mechanistic studies demonstrated that Ag seeds with both cubic and quasi-spherical shapes could evolve into octahedra. For the first time, we were able to precisely control the edge lengths of Ag octahedra below 100 nm, and the lower limit of size could even be pushed down to 20 nm. Using the as-obtained Ag octahedra as sacrificial templates, Au nanocages with an octahedral shape and precisely tunable optical properties were synthesized through a galvanic replacement reaction. Such hollow nanostructures are promising candidates for a broad range of applications related to optics, catalysis, and biomedicine.
authors: The Wallace H Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Georgia 30332, United States.
authors: Yi
authors: Y
authors: Wang
authors: Dehui
authors: D
authors: Wan
authors: Shuifen
authors: S
authors: Xie
authors: Xiaohu
authors: X
authors: Xia
authors: Cheng Zhi
authors: CZ
authors: Huang
authors: Younan
authors: Y
authors: Xia
mesh_terms: D008958:Models, Molecular; D008968:Molecular Conformation; D036103:Nanotechnology / Q000379:methods*; D055620:Optical Phenomena; D010316:Particle Size; D012834:Silver / Q000737:chemistry*
chemical_list: D012834:Silver