A facile polyol route to uniform gold octahedra with tailorable size and their optical properties

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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.
Publisher
AMER CHEMICAL SOC
Issue Date
2008-09
Language
English
Article Type
Article
Keywords

DISCRETE-DIPOLE APPROXIMATION; HIGH-YIELD SYNTHESIS; PLASMON RESONANCES; DIRECTED OXIDATION; NANOCRYSTALS; SILVER; NANOPARTICLES; SHAPE; NANORODS; NANOPRISMS

Citation

ACS NANO, v.2, no.9, pp.1760 - 1769

ISSN
1936-0851
DOI
10.1021/nn800264q
URI
http://hdl.handle.net/10203/92578
Appears in Collection
NE-Journal Papers(저널논문)
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