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

Silver nanoparticles with a single (111) 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 AgNO 3 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 comers make these new nanoparticles especially promising for enhancement of Raman scattering. © 2006 American Chemical Society.

Full Text

Duke Authors

Cited Authors

  • Wiley, BJ; Xiong, Y; Li, ZY; Yin, Y; Xia, Y

Published Date

  • 2006

Published In

Volume / Issue

  • 6 / 4

Start / End Page

  • 765 - 768

International Standard Serial Number (ISSN)

  • 1530-6984

Digital Object Identifier (DOI)

  • 10.1021/nl060069q

Citation Source

  • SciVal