Electronic, structural, and electrochemical modulation of electrostatic self-assembled 1t-mos2 Nanosheets via Topotactic structural conversion

Katsutoshi Fukuda, Akiyoshi Nakata, Masahito Morita, Yoshiharu Uchimoto, Satoshi Toyoda, Eiichiro Matsubara

研究成果: Article査読

抄録

We studied the electronic, structural, and electrochemical modulation of electrostatic self-assembled thin films in which a nanoscale pair of single layer 1T-MoS2 nanosheets and charge-compensating polymers as a counterpart in the self-assembly process stacked up on the substrate after heating. Heating the self-assembled monolayer and multilayers of the 1T-MoS2 nanosheets at 300 C under vacuum triggered a yellow coloration and structural transformation, referred to as the 1T→2H transition, without a significant morphological change. In the topotactic conversion, an energy shift of the Mo 3d and S 2p core levels to a higher binding energy corresponds to the edge shift of the valence band, indicating the unique nature of this system as a MoS2 molecule. The single layer state, which is often modulated by stacking the metallic-like 1T-MoS2 nanosheets and the semiconductor 2HMoS 2 nanosheets, was retained in the multilayers due to the robust interlayer galleries filled by the polymers. Cyclic voltammograms of a Li-ion battery using the 1T- or 2H-MoS2 multilayer film electrodes provided useful information on the electrochemical reaction of the MoS2 slabs, especially at the early stage of electrochemical Li insertion. These self-assembled ultra-thin films, offering well-defined MoS2 nanosheet structures in terms of stacking order and crystal structure, will promote future applications of the single-layer 1T- and 2H-MoS2 nanosheets.

本文言語English
ページ(範囲)1-7
ページ数7
ジャーナルe-Journal of Surface Science and Nanotechnology
13
DOI
出版ステータスPublished - 2015 1月 17
外部発表はい

ASJC Scopus subject areas

  • バイオテクノロジー
  • バイオエンジニアリング
  • 凝縮系物理学
  • 材料力学
  • 表面および界面
  • 表面、皮膜および薄膜

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