Nano Archive

Right bipyramids of silver: A new shape derived from single twinned seeds

Wiley, BJ and Xiong, YJ and Li, ZY and Yin, YD and Xia, YA (2006) Right bipyramids of silver: A new shape derived from single twinned seeds. NANO LETTERS, 6 (4). pp. 765-768.

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Silver nanoparticles with a single (1111) twin were selectively nucleated and grown for the first time to produce right bipyramids 75-150 nm in edge length. Key to the production of single twinned seeds was the addition of NaBr to a polyol synthesis in which AgNO3 is reduced by ethylene glycol in the presence of poly(vinyl pyrrolidone). Examination of nanoparticles; at different stages of the reaction with electron microscopy revealed that the spherical, single twinned seeds grew to become right bipyramids through enlargement of their (100) facets. The UV-vis-NIR spectrum exhibited by right bipyramids is distinct from that of any other silver nanostructure, and their sharp corners make these new nanoparticles especially promising for enhancement of Raman scattering.

Item Type:Article
Subjects:Physical Science > Photonics
ID Code:2768
Deposited By:Lesley Tobin
Deposited On:14 Jan 2009 14:05
Last Modified:14 Jan 2009 14:05

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