Anisotropic chemical reactivity of gold spheroids and nanorods

Nikhil R. Jana, Latha Gearheart, Sherine O. Obare, Catherine J. Murphy

Research output: Contribution to journalArticlepeer-review

Abstract

We observed anisotropic chemical reactivity of gold spheroids during cyanide dissolution and reaction with persulfate. Cyanide dissolution of 2-5 aspect ratio spheroids (with 12-30 nm short axis) starts at the ends of the long axis and leads to intermediate lower aspect ratio spheroids and spheres. Persulfate converts the spheroids into spheres. In contrast, cyanide dissolution of 18 aspect ratio nanorods (with 16 nm short axis) starts simultaneously at many sites and does not change the nanorod length throughout dissolution. Spheroids are thermally less stable than rods and slowly convert to spheres with time, and thus anisotropic chemical reactivity is presumably due to their lower stability.

Original languageEnglish (US)
Pages (from-to)922-927
Number of pages6
JournalLangmuir
Volume18
Issue number3
DOIs
StatePublished - Feb 5 2002
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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