Formation of a superatom monolayer using gas-phase-synthesized Ta@Si16 nanocluster ions

Masato Nakaya, Takeshi Iwasa, Hironori Tsunoyama, Toyoaki Eguchi, Atsushi Nakajima

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

The controlled assembly of superatomic nanocluster ions synthesized in the gas phase is a key technology for constructing a novel series of functional nanomaterials. However, it is generally difficult to immobilize them onto a conductive surface while maintaining their original properties owing to undesirable modifications of their geometry and charge state. In this study, it has been shown that this difficulty can be overcome by controlling the donor-acceptor interaction between nanoclusters and surfaces. Cations of Ta-atom-encapsulated Si16 cage nanoclusters (Ta@Si16) behaving as rare-gas-like superatoms are synthesized in the gas phase and deposited on conductive surfaces terminated with acceptor-like C60 and donor-like α-sexithiophene (6T) molecules. Scanning tunneling microscopy and spectroscopy have demonstrated that Ta@Si16 cations can be densely immobilized onto C60-terminated surfaces while retaining their cage shape and positive charge, which is realized by creating binary charge transfer complexes (Ta@Si16+-C60-) on the surfaces. The Ta@Si16 nanoclusters exhibit excellent thermal stability on C60-teminated surfaces similar to those in the gas phase, whereas the nanoclusters destabilize at room temperature on 6T-terminated surfaces owing to the loss of electronic closure via a change in the charge state. This journal is

Original languageEnglish
Pages (from-to)14702-14707
Number of pages6
JournalNanoscale
Volume6
Issue number24
DOIs
Publication statusPublished - 2014 Dec 21

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Nanoclusters
Monolayers
Gases
Ions
Cations
Positive ions
Noble Gases
Scanning tunneling microscopy
Inert gases
Nanostructured materials
Charge transfer
Thermodynamic stability
Spectroscopy
Atoms
Molecules
Geometry

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Formation of a superatom monolayer using gas-phase-synthesized Ta@Si16 nanocluster ions. / Nakaya, Masato; Iwasa, Takeshi; Tsunoyama, Hironori; Eguchi, Toyoaki; Nakajima, Atsushi.

In: Nanoscale, Vol. 6, No. 24, 21.12.2014, p. 14702-14707.

Research output: Contribution to journalArticle

Nakaya, Masato ; Iwasa, Takeshi ; Tsunoyama, Hironori ; Eguchi, Toyoaki ; Nakajima, Atsushi. / Formation of a superatom monolayer using gas-phase-synthesized Ta@Si16 nanocluster ions. In: Nanoscale. 2014 ; Vol. 6, No. 24. pp. 14702-14707.
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