Determination of exact positions of individual tungsten atoms in unisize tungsten oxide clusters supported on carbon substrate by HAADF-STEM observation

Hisato Yasumatsu, Tetsuya Tohei, Yuichi Ikuhara

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

The HAADF-STEM (high-angle annular dark-field scanning transmission electron microscope) observation has been performed for unisize tungsten oxide clusters fixed on a carbon substrate. The exact position of each tungsten atom in the clusters has been determined successfully by analyzing the HAADF-STEM images, so that it appears that the clusters have a three-dimensional tungsten-oxide bonding network. Furthermore, the tungsten clusters are not dissociated in all the processes of the cluster preparation on the substrate by the soft-landing of size-selected tungsten cluster ions, the exposure to air, and the substrate pretreatment for the HAADF-STEM observation. However, the clusters are decomposed gradually during the HAADF-STEM observation due to the irradiation of the high-energy electron beam.

Original languageEnglish
Pages (from-to)1706-1711
Number of pages6
JournalJournal of Physical Chemistry C
Volume118
Issue number3
DOIs
Publication statusPublished - 2014 Jan 23
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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