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 journalArticle

24 Citations (Scopus)

Abstract

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
Volume137
Issue number44
DOIs
Publication statusPublished - 2015 Nov 11

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Photoelectron Spectroscopy
Nanoclusters
Alkalies
Oxygen
Graphite
X ray photoelectron spectroscopy
Heating
Atoms
Core levels
Hot Temperature
Electronic structure
Degradation
Oxidation
Substrates

ASJC Scopus subject areas

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

Cite this

Chemical Characterization of an Alkali-Like Superatom Consisting of a Ta-Encapsulating Si16 Cage. / Shibuta, Masahiro; Ohta, Tsutomu; Nakaya, Masato; Tsunoyama, Hironori; Eguchi, Toyoaki; Nakajima, Atsushi.

In: Journal of the American Chemical Society, Vol. 137, No. 44, 11.11.2015, p. 14015-14018.

Research output: Contribution to journalArticle

Shibuta, Masahiro ; Ohta, Tsutomu ; Nakaya, Masato ; Tsunoyama, Hironori ; Eguchi, Toyoaki ; Nakajima, Atsushi. / Chemical Characterization of an Alkali-Like Superatom Consisting of a Ta-Encapsulating Si16 Cage. In: Journal of the American Chemical Society. 2015 ; Vol. 137, No. 44. pp. 14015-14018.
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