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- W4229336355 abstract "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@Si16 SA is staggered by the variation of the number of Si atoms in TaSin NCs (n = 6, 8, 12, 15, 17, and 18) and subsequent immobilization on a C60 fullerene substrate. Using X-ray photoelectron spectroscopy, the size dependence of chemical robustness of TaSin NCs on C60 against O2 exposures is quantitatively evaluated: In addition to the most outstanding stability of a Ta@Si16 SA 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 TaSin are 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@Si16 on C60 and (2) Ta@Si17 NCs are robust against O2 oxidation with assistance from the stability of Ta@Si16 SA despite the Si-adatom." @default.
- W4229336355 created "2022-05-09" @default.
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- W4229336355 date "2022-03-01" @default.
- W4229336355 modified "2023-10-16" @default.
- W4229336355 title "Size-Dependent Oxidative Stability of Silicon Nanoclusters Mixed with a Tantalum Atom" @default.
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- W4229336355 doi "https://doi.org/10.1021/acs.jpcc.1c10895" @default.
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