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Title 

Shape adjustment between multiply twinned and single-crystalline polyhedral gold nanocrystals: Decahedra, icosahedra, and truncated tetrahedra

Authors 

D SeoC I YooIm Sik ChungS M ParkS RyuH Song

Publisher 

American Chemical Society

Issue Date 

2008

Citation 

Journal of Physical Chemistry C - Nanomaterials & Interfaces, vol. 112, no. 7, pp. 2469-2475

Keywords 

crystalline materialsnanocrystals

Abstract 

Polyhedral gold nanocrystals with decahedral, icosahedral, and truncated tetrahedral shapes are synthesized by a simple one-pot polyol process in the prescence of poly(vinyl pyrrolidone) (PVP). High PVP concentration up to 360 equiv of the gold precursor, HAuCl4, effectively stabilizes decahedral seeds to yield uniform decahedra with various edge sizes. Decreased PVP concentration subsequently leads to selective formation of icosahedra and truncated tetrahedra. This results from a combination between the relative energy difference of the polyhedral structures and the oxidative etching rate of the seeds by Cl-/O2 during the reaction. The distinct morphologies of gold nanocrystals exhibit characteristic extinction patterns in the UV - vis - NIR ranges, and these properties are successfully analyzed by the discrete dipole approximation (DDA) calculation. Most extinctions stem from the polar and azimuthal dipolar excitations, and azimuthal quardrupole resonance appears between two dipolar bands in the 88-nm decahedra. Given these shape- and size-dependent optical properties, gold nanocrystals hold considerable promise for biomedical and photonic applications.

ISSN 

1932-7447

Link 

http://dx.doi.org/10.1021/jp7109498

Appears in Collections

1. Journal Articles > Journal Articles

Registered Date

2019-05-02


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