title: Seed-mediated synthesis of gold octahedra in high purity and with well-controlled sizes and optical properties.
abstract: We report a facile method for the synthesis of uniform Au octahedra with well-controlled sizes and optical properties by seed-mediated growth. Starting from single-crystal seeds of Au spheres with a uniform size, we could reproducibly obtain Au octahedra with a narrow size distribution (<7% in standard deviation) and in high purity (>90%). Moreover, the edge lengths of these Au octahedra could be readily tuned in a controllable fashion from 16 to 77 nm by varying the amount of seeds, the concentration of HAuCl(4) , or both. We have also investigated the effects of water and poly(vinyl pyrrolidone) (PVP) in the system, as well as the reaction temperature, on the evolution of octahedral shape.
authors.affiliation: Department of Biomedical Engineering, Washington University, Saint Louis, MO 63130, USA.
authors.forename: Do Youb
authors.initials: DY
authors.lastname: Kim
authors.forename: Weiyang
authors.initials: W
authors.lastname: Li
authors.forename: Yanyun
authors.initials: Y
authors.lastname: Ma
authors.forename: Taekyung
authors.initials: T
authors.lastname: Yu
authors.forename: Zhi-Yuan
authors.initials: ZY
authors.lastname: Li
authors.forename: O Ok
authors.initials: OO
authors.lastname: Park
authors.forename: Younan
authors.initials: Y
authors.lastname: Xia
mesh_terms: D006046:Gold / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D036103:Nanotechnology; D010316:Particle Size; D011205:Povidone / Q000737:chemistry*; D013499:Surface Properties; D014867:Water / Q000737:chemistry*
chemical_list: D014867:Water; D006046:Gold; D011205:Povidone