Chemical Characterization of an Alkali-Like Superatom Consisting of a Ta-Encapsulating Si16 Cage

Masahiro Shibuta, Tsutomu Ohta, Masato Nakaya, Hironori Tsunoyama, Toyoaki Eguchi, Atsushi Nakajima

Research output: Contribution to journalArticlepeer-review

40 Citations (Scopus)


Chemical characterization was performed for an alkali-like superatom consisting of a Ta-encapsulating Si16 cage, Ta@Si16, deposited on a graphite substrate using X-ray photoelectron spectroscopy (XPS) to element-specifically clarify the local electronic structure of the cage atoms. The XPS spectra derived from Ta 4f and Si 2p core levels have been well modeled with a single chemical component, revealing the formation of a symmetric Si cage around the Ta atom in the deposited nanoclusters. On chemical treatments by heating or oxygen exposure, it is found that the deposited Ta@Si16 is thermally stable up to 700 K and is also exceptionally less reactive toward oxygen compared to other Ta-Si nanoclusters, although some heat degradation and oxidation accompany the treatments. These results show the promising possibility of applying Ta@Si16 as a building block to fabricate cluster-assembled materials consisting of naked nanoclusters.

Original languageEnglish
Pages (from-to)14015-14018
Number of pages4
JournalJournal of the American Chemical Society
Issue number44
Publication statusPublished - 2015 Nov 11

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry


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