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Seed‐Mediated Synthesis of Gold Octahedra in High Purity and with Well‐Controlled Sizes and Optical Properties
Author(s) -
Kim Do Youb,
Li Weiyang,
Ma Yanyun,
Yu Taekyung,
Li ZhiYuan,
Park O Ok,
Xia Younan
Publication year - 2011
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201100365
Subject(s) - octahedron , materials science , enhanced data rates for gsm evolution , chemical engineering , crystallography , nanotechnology , crystal structure , chemistry , telecommunications , computer science , engineering
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.