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Issue 24, 2014
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Formation of a superatom monolayer using gas-phase-synthesized Ta@Si16 nanocluster ions

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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.

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

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Publication details

The article was received on 25 Jul 2014, accepted on 08 Sep 2014 and first published on 07 Oct 2014


Article type: Paper
DOI: 10.1039/C4NR04211E
Nanoscale, 2014,6, 14702-14707
  • Open access: Creative Commons BY license
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    Formation of a superatom monolayer using gas-phase-synthesized Ta@Si16 nanocluster ions

    M. Nakaya, T. Iwasa, H. Tsunoyama, T. Eguchi and A. Nakajima, Nanoscale, 2014, 6, 14702
    DOI: 10.1039/C4NR04211E

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