Molecularly Designed Cluster-Surface Interaction for Halogen-like and Alkali-like Metal-Encapsulating Silicon Cage Superatoms on n- and p-Type Organic Substrates

Toshiaki Kamoshida, Masahiro Shibuta, Tsutomu Ohta, Toyoaki Eguchi, Atsushi Nakajima

研究成果: Article査読

5 被引用数 (Scopus)

抄録

Metal-encapsulating Si16cage clusters (M@Si16) are promising superatoms (SAs) for designing tunable properties for their assembled materials by changing the central metal atom: halogen-like, rare-gas-like, and alkali-like characteristics appear for the central metal atom of groups 3, 4, and 5, respectively. To fabricate SA assemblies, metal-encapsulating M@Si16SAs (M = Lu, Hf, and Ta) must be controllably immobilized on a substrate. Substrates decorated with organic molecules can facilitate optimization of a cluster-surface interaction because the molecular local interactions between SAs and predeposited organic molecules govern the electronic properties through molecular complexation. In this study, M@Si16SAs are size-selectively soft-landed on organic substrates deposited with n-type fullerene (C60) and p-type hexa-tert-butyl-hexa-peri-hexabenzocoronene (HB-HBC, C66H66), and the electronic states of M@Si16on the organic substrates are characterized by X-ray and ultraviolet photoelectron spectroscopy. On the C60substrate, all M@Si16are fixed to be cationic, forming M@Si16+C60-via a charge transfer interaction, while on an HB-HBC substrate, M@Si16-HB-HBC+(M = Lu and Hf) is formed with anionic M@Si16-. Together with density functional theory calculations, the charge preference of the M@Si16SA is examined based on its chemical stability against O2gas exposure; Lu@Si16on HB-HBC is more robust toward O2than that on C60, while Ta@Si16on HB-HBC is less robust than that on C60. Depending on the SA properties, an appropriate selection of organic molecules for deposition provides a molecular designer concept for forming SA-assembled nanomaterials through the cluster-surface interaction.

本文言語English
ページ(範囲)10889-10899
ページ数11
ジャーナルJournal of Physical Chemistry C
126
26
DOI
出版ステータスPublished - 2022 7月 7

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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