Size-Dependent Oxidative Stability of Silicon Nanoclusters Mixed with a Tantalum Atom

Masahiro Shibuta, Maximilian Huber, Toshiaki Kamoshida, Kazuya Terasaka, Miho Hatanaka, Gereon Niedner-Schatteburg, Atsushi Nakajima

研究成果: Article査読

2 被引用数 (Scopus)

抄録

Metal-encapsulating silicon cage (M@Si16) nanoclusters (NCs) are promising superatoms (SAs) as function-tunable nanomaterials, which exhibit a superior chemical stability owing to electronic and geometric closures. Here, we examine how the superatomic nature of an alkali-like Ta@Si16SA is staggered by the variation of the number of Si atoms in TaSinNCs (n = 6, 8, 12, 15, 17, and 18) and subsequent immobilization on a C60fullerene substrate. Using X-ray photoelectron spectroscopy, the size dependence of chemical robustness of TaSinNCs on C60against O2exposures is quantitatively evaluated: In addition to the most outstanding stability of a Ta@Si16SA as compared to TaSi15, some enhanced stability is also observed at Ta@Si17, which couples in a Si-adatom structure of (Ta@Si16)-Si to the support. While oxidative reactivities of TaSinare gradually suppressed from small NCs (n = 6) to larger ones (n = 18) with increasing number of Si atoms, the results show that (1) an enclosing Si cage around a Ta atom is completed at Ta@Si16on C60and (2) Ta@Si17NCs are robust against O2oxidation with assistance from the stability of Ta@Si16SA despite the Si-adatom.

本文言語English
ページ(範囲)4423-4432
ページ数10
ジャーナルJournal of Physical Chemistry C
126
9
DOI
出版ステータスPublished - 2022 3月 10

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • エネルギー一般
  • 物理化学および理論化学
  • 表面、皮膜および薄膜

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