期刊
ACS NANO
卷 2, 期 9, 页码 1760-1769出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn800264q
关键词
crystal growth; gold; octahedron; polyol synthesis; size tailoring; surface plasmon resonance
类别
资金
- Korea Science and Engineering Foundation [2007-00543]
- Wigner Fellowship Program
- Division of Chemical Sciences, Biosciences, and Geosciences
- Office of Basic Energy Sciences
- U.S. Department of Energy [DE-AC05-000R22725]
- Oak Ridge National Laboratory, managed and operated by UT-Battelle, LLC
- National Research Foundation of Korea [2007-00543] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
A straightforward and effective polyol route for the controllable synthesis of high-quality gold (Au) octahedra with uniform size is presented in an ethylene glycol solution. Large-scale Au octahedra with the size ranging from tens to hundreds of nanometers; were selectively synthesized in high-yield. The surfaces of octahedral Au nanocrystals are smooth and correspond to {111} planes. Formation of Au nanooctahedra was attributed to the preferential adsorption of cationic surfactant poly(diallyldimethylammonium) chloride (PDDA) molecules on the {111} planes of Au nuclei that inhibited the growth rate along the < 111 > direction. The reduction rate of gold ions in the synthesis process can be rationally manipulated by acidic and basic solutions. This provides a facile and effective route to harvest Au octahedra with different dimensions. The synthetic strategy has the advantage of one-pot and requires no seeds, no foreign metal ions, and no pretreatment of the precursor, so that this is a practical method for controllable synthesis of Au octahedra. Size-dependent optical properties of Au octahedra were numerically and experimentally analyzed. The analysis shows that Au octahedra with sharp edges possess attractive optical properties, promising their applications to surface-enhancement spectroscopy, chemical or biological sensing, and the fabrication of nanodevices.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据