Structural transition of gold nanoclusters: from the golden cage to the golden pyramid

Wei Huang, Satya Bulusu, Rhitankar Pal, Xiao Cheng Zeng, Lai Sheng Wang

Research output: Contribution to journalArticle

85 Scopus citations

Abstract

How nanoclusters transform from one structural type to another as a function of size is a critical issue in cluster science. Here we report a study of the structural transition from the golden cage Au 16 - to the pyramidal Au 20 -. We obtained distinct experimental evidence that the cage-to-pyramid crossover occurs at Au 18 -, for which the cage and pyramidal isomers are nearly degenerate and coexist experimentally. The two isomers are observed and identified by their different interactions with O 2 and Ar. The cage isomer is observed to be more reactive with O2 and can be preferentially 'titrated' from the cluster beam, whereas the pyramidal isomer has slightly stronger interactions with Ar and is favored in the Au 18Ar X - van der Waals complexes. The current study allows the detailed structural evolution and growth routes from the hollow cage to the compact pyramid to be understood and provides information about the structure-function relationship of the Au 18 - cluster.

Original languageEnglish (US)
Pages (from-to)1225-1230
Number of pages6
JournalACS Nano
Volume3
Issue number5
DOIs
StatePublished - May 26 2009

Keywords

  • Gold clusters
  • Photoelectron spectroscopy
  • Sstructure-function relationship
  • Structural isomers
  • Van der Waals complexes

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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